Multi-linked variable mode sewage treatment efficiency improvement system and method

Abstract

The present invention provides a multi-link variable mode sewage efficiency improvement treatment system and method, the treatment system includes: a plurality of treatment units connected by pipes with controllable switches; the plurality of treatment units include a sewage biochemical main reaction unit and at least one of the following treatment units: a variable mode unit for the first sewage biochemical reaction or physicochemical dosing reaction, a variable mode unit for the second sewage biochemical reaction or physicochemical dosing reaction, a sedimentation separation unit, an activated sludge return and excess sludge removal unit, a water storage tank, and a sewage lifting function unit; wherein the plurality of treatment units are configured to be configurable to a plurality of different working modes based on preselected functions. The treatment system provided by the present invention greatly promotes the increase in quantity and efficiency of sewage purification, the increase in quality and efficiency, the strong ability to resist water quantity and quality shock load, the simple process operation, and the various operation modes and flexible switching.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a multi-link variable mode sewage efficiency improvement treatment system and method. Background Art

[0002] Sewage treatment (wastewater treatment): refers to the process of removing pollutants from wastewater. It mainly includes domestic sewage and some industrial wastewater. Physical, chemical and biological processes are used to remove pollutants and produce treated wastewater (or treated wastewater) that is safe for release into the environment. The by-product of sewage treatment is a solid waste called sludge that has been reduced, stabilized and made harmless. Sludge must be further treated before it is suitable for land disposal or application to land.

[0003] Sewage treatment can be divided into three types according to its function: physical method, biological method and chemical method:

[0004] ① Physical method: It mainly uses physical action to separate insoluble substances in sewage, and does not change the chemical properties during the treatment process. Commonly used methods include gravity separation, centrifugal separation, reverse osmosis, flotation, physical adsorption, etc. The physical method treatment structure is simpler and more economical.

[0005] ② Biological method: Utilize the metabolic function of microorganisms to decompose and oxidize organic matter in the sewage in dissolved or colloidal state into stable inorganic substances, so that the sewage can be purified. Commonly used methods include activated sludge method and biofilm method. The biological method has a higher degree of treatment than the physical method.

[0006] ③Chemical method: It is a method of treating or recovering dissolved substances or colloidal substances in sewage by chemical reaction. Commonly used methods include coagulation, chemical adsorption, advanced oxidation, neutralization, redox, ion exchange, etc. Chemical treatment has good treatment effect and relatively high cost. It is mostly used for further enhanced treatment of effluent after biochemical treatment to improve effluent quality.

[0007] Sewage treatment can be divided into primary treatment, secondary treatment and tertiary treatment according to the degree of treatment. Primary treatment is mainly to remove suspended solid matter in sewage, and physical methods are often used. The concentration of pollutants in wastewater after primary treatment is still very high and it is still not suitable for discharge, so secondary treatment is required. The main task of secondary treatment is to significantly remove organic matter or inorganic matter such as nitrogen and phosphorus in colloidal and dissolved state in sewage. Generally, sewage that has undergone secondary treatment can meet the discharge standards, and activated sludge method and biofilm treatment method are commonly used. The purpose of tertiary treatment is to further remove certain special pollutants, which belongs to deep enhanced treatment, and chemical or biochemical methods are often used.

[0008] In the process of implementing the present invention, the inventors found that there are at least the following problems in the prior art:

[0009] At present, sewage treatment equipment mostly adopts a single biochemical treatment (such as A2O and its similar processes) in series with physical and chemical precipitation deep treatment (such as high-efficiency sedimentation tanks). The treatment process combination is simple, and it is difficult to achieve high efficiency in the purification of pollutants. It is difficult to achieve multi-effect synergistic and efficient removal of conventional or certain characteristic targeted pollutants in sewage and wastewater such as carbon, nitrogen, phosphorus, color, turbidity, algae, and medium- and long-chain pollutants that are difficult to biodegrade and remove. In particular, the operation flexibility is poor, and it can often only cope with sewage under a certain working condition (type). It is difficult to adapt to various water quantity and water quality load impact conditions (such as excessive water quality load, flood season or overflow pollution overload control).

[0010] Therefore, a multi-mode sewage treatment efficiency improvement system and method is needed to at least partially solve the above technical problems. Summary of the invention

[0011] In view of this, an embodiment of the present invention provides a multi-mode sewage treatment efficiency improvement system and method to solve at least one of the problems in the prior art.

[0012] One aspect of the present invention provides a multi-link variable mode sewage treatment system, the treatment system comprising: a plurality of treatment units connected by pipelines with controllable switches; the plurality of treatment units comprising a sewage biochemical main reaction unit and at least one of the following treatment units: a variable mode unit for a first sewage biochemical reaction (anoxic reaction or mud phase adsorption) or a physicochemical dosing reaction, a variable mode unit for a second sewage biochemical reaction (anoxic reaction or mud phase adsorption) or a physicochemical dosing reaction, a sedimentation separation unit, an activated sludge return and excess sludge removal unit, a water storage tank, and a sewage lifting function unit; wherein the plurality of treatment units are configured to be configurable to different working modes based on preselected functions; the working modes include at least one of the following modes:

[0013] The first path mode: biochemical reaction tank-biochemical precipitation unit-water storage tank mode;

[0014] The second path mode: feeding reaction tank - coagulation reaction tank - precipitation clarification unit mode;

[0015] The third path mode: biochemical reaction tank - feeding reaction tank - condensation reaction tank - biochemical precipitation unit - water storage tank;

[0016] The third expansion path mode: biochemical reaction tank - anoxic denitrification reaction tank I or deoxygenation and degassing tank I - anoxic denitrification reaction tank II or deoxygenation and degassing tank II - biochemical precipitation unit - water storage tank;

[0017] The fourth path mode: biochemical reaction tank - feeding reaction tank - coagulation reaction tank - precipitation clarification unit;

[0018] Fifth path mode: a serial coupling mode of the first path mode and the second path mode, biochemical reaction tank - biochemical precipitation unit - water storage tank - feeding reaction tank - coagulation reaction tank - precipitation clarification unit;

[0019] Sixth path mode: a parallel coupling mode of the first path mode and the second path mode, that is, a biochemical reaction tank-biochemical precipitation unit-water storage tank mode and a feeding reaction tank-coagulation reaction tank-precipitation clarification unit parallel mode;

[0020] Seventh path mode: a hybrid coupling mode of the first path mode and the second path mode.

[0021] Preferably, in a specific embodiment of the system according to the present disclosure, the processing system comprises:

[0022] The first treatment unit, the front end of which is fed with sewage, is constructed as a sewage biochemical main reaction unit; at least an anaerobic reaction zone (main anoxic reaction zone) and an aerobic reaction zone are provided in the first treatment unit, the anaerobic (main anoxic) reaction zone is provided with a stirring power device, and the aerobic reaction zone is provided with an aeration device; the second treatment unit, the second treatment unit is constructed as a variable mode unit for sewage biochemical reaction or physicochemical dosing reaction; the second treatment unit is provided with a stirring power device and a dosing device for adding a water treatment purifier; the third treatment unit, the third treatment unit is constructed as a variable mode unit for sewage biochemical reaction or physicochemical dosing reaction; the third treatment unit is provided with a stirring power device, an auxiliary nitrification liquid a reflux device and a dosing device for adding a water treatment coagulant; a fourth treatment unit, the fourth treatment unit is constructed as a sedimentation and separation unit for activated sludge and treated sewage, and the fourth treatment unit is provided with a sludge scraping device; a fifth treatment unit, the fifth treatment unit is constructed as an activated sludge reflux and excess sludge removal unit, and the fifth treatment unit is provided with a sludge reflux device and a sludge discharge device; a sixth treatment unit, the sixth treatment unit is constructed as a sedimentation and separation unit for sludge and treated sewage, and the sixth treatment unit is provided with a sludge scraping device, a sludge reflux device and a sludge discharge device; and a seventh treatment unit, the seventh treatment unit is constructed as a water storage tank, and the seventh treatment unit is provided with a sewage pressure boosting device;

[0023] Wherein, the first treatment unit, the second treatment unit, the third treatment unit, the fourth treatment unit, the fifth treatment unit, the sixth treatment unit and the seventh treatment unit are connected by pipelines and can flexibly form at least the following sewage treatment paths:

[0024] The sewage passes through the first treatment unit, the fourth treatment unit and the seventh treatment unit connected in sequence, at which time the first treatment unit is used as a biochemical reaction tank, and the fourth treatment unit is used as a biochemical precipitation unit;

[0025] The sewage passes through the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the second treatment unit is used as a feeding reaction tank, the third treatment unit is used as a coagulation reaction tank, and the sixth treatment unit is used as a sedimentation and clarification unit;

[0026] The sewage passes through the first treatment unit, the second treatment unit, the third treatment unit, the fourth treatment unit and the seventh treatment unit connected in sequence, at which time the first treatment unit is used as a biochemical reaction tank, the second treatment unit can be flexibly used as a feeding reaction tank, anoxic denitrification reaction tank or an oxygen removal and degassing tank, the third treatment unit can be flexibly used as a condensation reaction tank, anoxic denitrification reaction tank or an oxygen removal and degassing tank, and the fourth treatment unit is used as a biochemical precipitation unit;

[0027] The sewage passes through the first treatment unit, the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the second treatment unit is used as a feeding reaction tank, the third treatment unit is used as a coagulation reaction tank, and the sixth treatment unit is used as a sedimentation and clarification unit;

[0028] The sewage passes through the first treatment unit, the fourth treatment unit, the seventh treatment unit, the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the fourth treatment unit is used as a biochemical precipitation unit, the second treatment unit is used as a feeding reaction tank, the third treatment unit is a coagulation reaction tank, and the sixth treatment unit is a precipitation clarification unit;

[0029] Part of the flow of sewage passes through the first treatment unit, the fourth treatment unit and the seventh treatment unit connected in sequence, and the remaining flow of sewage passes through the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the fourth treatment unit is used as a biochemical precipitation unit, the second treatment unit is used as a feeding reaction tank, the third treatment unit is a coagulation reaction tank, and the sixth treatment unit is a precipitation and clarification unit;

[0030] After the sewage passes through the first treatment unit, part of the flow passes through the fourth treatment unit and the seventh treatment unit connected in sequence, and the remaining flow passes through the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the fourth treatment unit is used as a biochemical precipitation unit, the second treatment unit is used as a feeding reaction tank, the third treatment unit is a coagulation reaction tank, and the sixth treatment unit is a sedimentation and clarification unit.

[0031] The multi-linked variable mode sewage efficiency improvement treatment system according to the present invention comprises a first treatment unit, a second treatment unit, a third treatment unit, a fourth treatment unit, a fifth treatment unit, a sixth treatment unit, a seventh treatment unit and associated pipelines, wherein the first treatment unit, the second treatment unit and the third treatment unit are sewage reaction purification functions, the fourth treatment unit and the sixth treatment unit are mud-water sedimentation separation functions, the fifth treatment unit is a sludge return (exclusion) function, and the seventh treatment unit is a water storage tank (also a sewage lifting function). This treatment system realizes microbial biochemical reaction, efficient nitrogen and phosphorus removal, efficient sedimentation separation, biological mud phase adsorption, and difficult biodegradation removal. It integrates the efficiency-enhancing functions such as oxidative chain-breaking decomposition of medium- and long-chain pollutant molecular chains and drug addition enhancement, greatly promoting the increase in quantity and efficiency of sewage purification, improving quality and efficiency, having a strong ability to resist water quantity and quality shock loads, simple process operation, diverse operating modes and flexible switching, and achieving multi-effect synergistic and efficient removal of conventional or certain characteristic targeted pollutants in sewage and wastewater such as carbon, nitrogen, phosphorus, chromaticity, turbidity, algae, and medium- and long-chain pollutants that are difficult to remove by biochemical degradation, and simultaneously achieving the benefits of pollution reduction, carbon reduction, energy conservation and consumption reduction; the present invention utilizes the same system to form a multi-linked and multi-mode sewage treatment system through pipeline control, which can flexibly cope with sewage of different types (working conditions).

[0032] Optionally, the treatment system includes a water distribution system, and the water distribution system includes a water inlet pipeline, an internal communication pipeline and a water outlet pipeline;

[0033] The water inlet pipeline comprises: a first water inlet pipeline connected to the water inlet end of the first processing unit; a second water inlet pipeline connected to the water inlet end of the second processing unit;

[0034] The internal connecting pipeline includes: a first internal connecting pipeline connected from the water outlet of the first treatment unit to the water inlet of the second treatment unit; a second internal connecting pipeline connected from the water outlet of the second treatment unit to the water inlet of the third treatment unit; a third internal connecting pipeline connected from the water outlet of the third treatment unit to the water inlet of the fourth treatment unit; a fourth internal connecting pipeline connected from the water outlet of the fourth treatment unit to the water inlet of the seventh treatment unit; a fifth internal connecting pipeline connected from the water outlet of the first treatment unit to the water inlet of the fourth treatment unit; a sixth internal connecting pipeline connected from the water outlet of the third treatment unit to the water inlet of the sixth treatment unit; a seventh internal connecting pipeline connected from the seventh treatment unit to the water inlet of the second treatment unit; and an eighth internal connecting pipeline connected from the fourth treatment unit to the water inlet of the fifth treatment unit.

[0035] The water outlet pipeline includes: a first water outlet pipeline connected to the water outlet end of the sixth processing unit; a second water outlet pipeline connected to the water outlet end of the seventh processing unit;

[0036] The first water inlet pipeline, the second water inlet pipeline, the first internal connecting pipeline, the third internal connecting pipeline, the fifth internal connecting pipeline, the sixth internal connecting pipeline, the seventh internal connecting pipeline, the first water outlet pipeline and the second water outlet pipeline are all provided with valves for controlling the opening and closing of the pipelines.

[0037] Optionally, the treatment system includes a nitrifying liquid circulation system, and the nitrifying liquid circulation system includes a nitrifying liquid circulation pipeline; the nitrifying liquid circulation pipeline is connected from the third treatment unit to the first treatment unit, and the auxiliary nitrifying liquid reflux device is arranged on the nitrifying liquid circulation pipeline.

[0038] Optionally, the treatment system comprises a sludge circulation system, the sludge circulation system comprising a first sludge circulation pipeline and a second sludge circulation pipeline;

[0039] The first sludge circulation pipeline is connected from the fifth treatment unit to the first treatment unit, and the second sludge circulation pipeline is connected from the sixth treatment unit to the first treatment unit and the third treatment unit;

[0040] The first sludge circulation pipeline is provided with the sludge return device, the second sludge circulation pipeline is provided with the sludge return device, and the second sludge circulation pipeline is provided with a valve for controlling the opening and closing of the pipeline.

[0041] Optionally, the treatment system includes a dosing system, and the dosing system includes: a first dosing pipeline connected to the second treatment unit; a second dosing pipeline connected to the third treatment unit;

[0042] Wherein, the first dosing pipeline and the second dosing pipeline are respectively provided with dosing devices.

[0043] Optionally, the treatment system includes a sludge discharge system, and the sludge discharge system includes: a first sludge discharge pipeline for discharging excess sludge from the bottom of the fifth treatment unit; a second sludge discharge pipeline for discharging excess sludge from the bottom of the sixth treatment unit;

[0044] Wherein, the first sludge discharge pipeline and the second sludge discharge pipeline are respectively provided with sludge discharge devices.

[0045] Another aspect of the present invention provides a multi-link variable mode sewage efficiency improvement treatment method. The multi-link variable mode sewage efficiency improvement treatment system based on the above technical solution, according to the water quality and water quantity load impact working condition of the sewage to be treated, opens and closes the pipeline to make the sewage pass through one of the following sewage treatment paths:

[0046] Path 1: The sewage passes through the first treatment unit, the fourth treatment unit and the seventh treatment unit connected in sequence, at which time the first treatment unit is used as a biochemical reaction tank, and the fourth treatment unit is used as a biochemical precipitation unit;

[0047] Path 2: The sewage passes through the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the second treatment unit is used as a feeding reaction tank, the third treatment unit is used as a coagulation reaction tank, and the sixth treatment unit is used as a sedimentation and clarification unit;

[0048] Path three: The sewage passes through the first treatment unit, the second treatment unit, the third treatment unit, the fourth treatment unit and the seventh treatment unit connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the second treatment unit can be flexibly used as a feeding reaction tank, anoxic denitrification reaction tank or anoxic degassing tank, the third treatment unit can be flexibly used as a condensation reaction tank, anoxic denitrification reaction tank or anoxic degassing tank, and the fourth treatment unit is used as a biochemical precipitation unit;

[0049] Path four: The sewage passes through the first treatment unit, the second treatment unit, the third treatment unit and the sixth treatment unit which are connected in sequence. At this time, the first treatment unit serves as a biochemical reaction tank, the second treatment unit serves as a feeding reaction tank, the third treatment unit serves as a coagulation reaction tank, and the sixth treatment unit serves as a sedimentation and clarification unit. The first treatment unit maintains the MLSS in the activated sludge below 1500 mg / L. Preferably, the first treatment unit maintains the MLSS in the activated sludge above 600 mg / L but below 1500 mg / L, and the ratio of MLVSS to MLSS in the activated sludge is greater than or equal to 0.45.

[0050] Path 5: The sewage passes through the first treatment unit, the fourth treatment unit, the seventh treatment unit, the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the fourth treatment unit is used as a biochemical precipitation unit, the second treatment unit is used as a feeding reaction tank, the third treatment unit is a coagulation reaction tank, and the sixth treatment unit is a precipitation clarification unit;

[0051] Path six: Part of the sewage flow passes through the first treatment unit, the fourth treatment unit and the seventh treatment unit connected in sequence, and the remaining sewage flow passes through the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the fourth treatment unit is used as a biochemical precipitation unit, the second treatment unit is used as a feeding reaction tank, the third treatment unit is a coagulation reaction tank, and the sixth treatment unit is a precipitation clarification unit;

[0052] Path seven: After the sewage passes through the first treatment unit, part of the flow passes through the fourth treatment unit and the seventh treatment unit connected in sequence, and the remaining flow passes through the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the fourth treatment unit is used as a biochemical precipitation unit, the second treatment unit is used as a feeding reaction tank, the third treatment unit is a coagulation reaction tank, and the sixth treatment unit is a sedimentation and clarification unit.

[0053] According to the multi-link variable mode sewage treatment efficiency improvement method of the present invention, according to the different water quality and water volume load impact conditions of the sewage to be treated, the corresponding sewage treatment path can be flexibly formed by opening and closing the pipeline, realizing the microbial biochemical reaction, efficient nitrogen and phosphorus removal, efficient sedimentation separation, biological mud phase adsorption, dosing enhancement and other efficiency improvement functions in one, greatly promoting the increase in quantity and efficiency of sewage purification, and improving the quality and efficiency, with strong resistance to water volume and water quality impact load, simple process operation, diverse operation modes and flexible switching, and realizing multi-effect synergistic and efficient removal of conventional or certain characteristic targeted pollutants in sewage and wastewater such as carbon, nitrogen, phosphorus, chromaticity, turbidity, algae, and medium and long-chain pollutants that are difficult to biodegrade and remove, and simultaneously achieving the benefits of pollution reduction and carbon reduction, energy conservation and consumption reduction.

[0054] Optionally, the hydraulic retention time of the second treatment unit is limited to 5 to 30 minutes, the hydraulic retention time of the third treatment unit is limited to 5 to 30 minutes, and the hydraulic retention time of the sixth treatment unit is limited to 15 to 45 minutes.

[0055] Additional advantages, purposes, and features of the present invention will be described in part in the following description, and will become apparent to those skilled in the art after studying the following, or may be learned from the practice of the present invention. The purposes and other advantages of the present invention may be achieved and obtained by the structures specifically indicated in the specification and the accompanying drawings.

[0056] Those skilled in the art will appreciate that the objectives and advantages that can be achieved with the present invention are not limited to the above specific description, and the above and other objectives that can be achieved by the present invention will be more clearly understood from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of this application, and do not constitute a limitation of the present invention. The components in the drawings are not drawn to scale, but are only for illustrating the principles of the present invention. In order to facilitate the illustration and description of some parts of the present invention, the corresponding parts in the drawings may be enlarged, that is, they may become larger relative to other components in the exemplary device actually manufactured according to the present invention. In the drawings:

[0058] Figure 1It is an overall schematic diagram of a multi-link variable mode sewage treatment efficiency improvement system according to an embodiment of the present invention;

[0059] Figure 2 A schematic diagram of path one and path two in a multi-link variable mode sewage efficiency improvement treatment method according to an embodiment of the present invention;

[0060] Figure 3 A schematic diagram of path three and path four in a multi-link variable mode sewage treatment efficiency improvement method according to an embodiment of the present invention; and

[0061] Figure 4 This is a schematic diagram of path five, path six and path seven in a multi-mode sewage efficiency improvement method according to an embodiment of the present invention.

[0062] Description of reference numerals:

[0063] Processing system: 100;

[0064] First processing unit: 1;

[0065] Second processing unit: 2;

[0066] Third processing unit: 3;

[0067] Fourth processing unit: 4;

[0068] Fifth processing unit: 5;

[0069] Sixth processing unit: 6;

[0070] Seventh processing unit: 7;

[0071] Pipeline: 11, 111, 112, 12, 21, 121, 22, 31, 32, 41, 42, 44, 51, 52, 61, 62, 621, 622, 63, 64, 71, 72, 73;

[0072] Valve: a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13;

[0073] Stirring power device: b1, b3, b4;

[0074] Aeration device: b2;

[0075] Dosing device: 81, 82;

[0076] Auxiliary nitration liquid reflux device: b4';

[0077] Mud scraping device: b5, b6;

[0078] Sludge return device: b8, b10;

[0079] Sludge discharge device: b9, b11;

[0080] Sewage pressure booster: b7. DETAILED DESCRIPTION

[0081] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0082] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solutions according to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0083] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, elements, steps or components, but does not exclude the presence or addition of one or more other features, elements, steps or components.

[0084] It should also be noted that, unless otherwise specified, the term “connection” herein may refer not only to a direct connection but also to an indirect connection with an intermediate.

[0085] In the present disclosure, the expressions first, second, third, fourth, fifth, sixth and seventh are merely used to distinguish different processing units, and the numbers do not include or indicate the order and ranking therein. The connection and order of these processing units shall be subject to the specific descriptions.

[0086] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the accompanying drawings, the same reference numerals represent the same or similar components, or the same or similar steps.

[0087] The present application provides a multi-link variable mode sewage treatment efficiency improvement system and method, which can form different sewage treatment paths by flexibly switching various connection combinations. The present application can use the same system to form a multi-link variable mode sewage treatment system through pipeline control, so that it can flexibly deal with different types (working conditions) of sewage.

[0088] One aspect of the present invention provides a multi-link variable mode sewage treatment efficiency improvement system, the treatment system comprising: a plurality of treatment units connected by pipes with controllable switches; the plurality of treatment units include a sewage biochemical main reaction unit and at least one of the following treatment units: a variable mode unit for a first sewage biochemical reaction (anoxic reaction or mud phase adsorption) or a physicochemical dosing reaction, a variable mode unit for a second sewage biochemical reaction (anoxic reaction or mud phase adsorption) or a physicochemical dosing reaction, a sedimentation and separation unit, an activated sludge return and residual sludge removal unit, a water storage tank, and a sewage lifting functional unit.

[0089] The plurality of processing units are configured to be configured in different working modes based on pre-selected functions; the working modes include at least one of the following modes:

[0090] The first path mode: biochemical reaction tank-biochemical precipitation unit-water storage tank mode.

[0091] The second path mode: feeding reaction tank - coagulation reaction tank - sedimentation clarification unit mode.

[0092] The third path mode: biochemical reaction tank - feeding reaction tank - condensation reaction tank - biochemical precipitation unit - water storage tank;

[0093] The third expansion path model: biochemical reaction tank - anoxic denitrification reaction tank I or anoxic degassing tank I - anoxic denitrification reaction tank II or anoxic degassing tank II - biochemical precipitation unit - water storage tank.

[0094] The fourth path mode: biochemical reaction tank—feeding reaction tank—coagulation reaction tank—precipitation and clarification unit.

[0095] The fifth path mode: a series coupling mode of the first path mode and the second path mode, biochemical reaction tank - biochemical precipitation unit - water storage tank - feeding reaction tank - coagulation reaction tank - precipitation clarification unit.

[0096] The sixth path mode: the parallel coupling mode of the first path mode and the second path mode, that is, the biochemical reaction tank-biochemical precipitation unit-water storage tank mode and the feeding reaction tank-coagulation reaction tank-precipitation clarification unit parallel mode.

[0097] Seventh path mode: a hybrid coupling mode of the first path mode and the second path mode.

[0098] The treatment system and method integrate microbial biochemical reactions, efficient nitrogen and phosphorus removal, efficient sedimentation and separation, biological mud phase adsorption, and drug addition enhancement, which greatly promote the increase in quantity and efficiency of sewage purification, and the improvement in quality and efficiency. It has a strong ability to resist water volume and quality shock loads, simple process operation, and a variety of operating modes with flexible switching. It can achieve multi-effect synergistic and efficient removal of conventional or certain characteristic targeted pollutants in sewage and wastewater, such as carbon, nitrogen, phosphorus, chromaticity, turbidity, algae, and medium- and long-chain pollutants that are difficult to biodegrade, and simultaneously achieve the benefits of reducing pollution and carbon emissions, and saving energy and reducing consumption.

[0099] The present application provides a multi-link variable mode sewage treatment system 100, including the first treatment unit to the seventh treatment unit and associated pipelines, associated valves, and equipment. The first treatment unit 1, the second treatment unit 2, and the third treatment unit 3 are sewage reaction purification functions, the fourth treatment unit 4 and the sixth treatment unit 6 are mud and water sedimentation separation functions, the fifth treatment unit 5 is a sludge return (exclusion) function, and the seventh treatment unit 7 is a water storage tank (also a sewage lifting function).

[0100] refer to Figure 1 In a preferred embodiment, the processing system 100 may include a first processing unit to a seventh processing unit. The specific contents are as follows:

[0101] The front end of the first treatment unit is filled with sewage, which is the main sewage biochemical reaction unit. The first treatment unit is provided with at least an anaerobic reaction zone (main anoxic reaction zone) and an aerobic reaction zone. The anaerobic (main anoxic) reaction zone is provided with a stirring power device b1. The aerobic reaction zone is provided with an aeration device b2.

[0102] The second treatment unit is a variable mode unit for sewage biochemical reaction (anoxic reaction or mud phase adsorption) or physical and chemical dosing reaction. Its hydraulic retention time is generally 5 to 30 minutes. The second treatment unit is provided with a stirring power device b3 and a dosing device 81 for adding water treatment purifiers or other related dosing agents. The water treatment purifier can be an inorganic or polymer coagulant (including phosphorus removal) of iron ion, aluminum ion, iron-aluminum ion type (or assisted by silicon or silicate components), or activated carbon fiber, zeolite powder, molecular sieve, kaolin and other adsorbents, or assisted by low-content (low dose, low side effect) oxidants (such as ferrate, hydrogen peroxide), or one or more adsorbents and coagulants, oxidants, in effective combination.

[0103] The third treatment unit is also a variable mode unit for sewage biochemical reaction (anoxic reaction or mud phase adsorption) or physical and chemical dosing reaction. Its hydraulic retention time is generally 5 to 30 minutes. The third treatment unit is provided with a stirring power device b4, an auxiliary nitrification liquid reflux device b4' and a dosing device 82 for adding water treatment coagulants. The dosing device 82 can add water treatment coagulants such as polymer condensation nucleus adsorption bridging (such as anionic PAM, cationic PAM, non-ionic PAM, polydimethyldiallyl ammonium chloride, polyglutamic acid, biological flocculants, etc., one or more highly efficient, mature and fast-dissolving coagulants).

[0104] The fourth treatment unit is a sedimentation and separation unit for activated sludge and treated sewage. The fourth treatment unit is provided with a sludge scraping device b5.

[0105] The fifth treatment unit flows in from the fourth treatment unit. The fifth treatment unit is an activated sludge return and excess sludge removal unit. The fifth treatment unit is provided with a sludge return device b8 and a sludge discharge device b9.

[0106] The sixth treatment unit is a sedimentation and separation unit for sludge and treated sewage. Its hydraulic retention time is generally 15 to 45 minutes. The sixth treatment unit is equipped with a sludge scraping device b6, a sludge return device b10 and a sludge discharge device b11.

[0107] The seventh treatment unit is a water storage tank (or also has the function of sewage lifting). The seventh treatment unit is provided with a sewage pressure lifting device b7.

[0108] Among them, the first treatment unit, the second treatment unit, the third treatment unit, the fourth treatment unit, the fifth treatment unit, the sixth treatment unit and the seventh treatment unit are connected by pipelines and can flexibly form at least seven sewage treatment paths (which will be described in detail below) to improve the efficiency of sewage treatment in different situations.

[0109] The multi-linked variable mode sewage treatment system of the present invention realizes the efficiency-enhancing functions of microbial biochemical reaction, efficient nitrogen and phosphorus removal, efficient precipitation separation, biological mud phase adsorption, and drug addition enhancement, which greatly promotes the increase in quantity and quality of sewage purification, has strong resistance to water quantity and water quality shock load, simple process operation, diverse operation modes and flexible switching, and realizes multi-effect synergistic and efficient removal of conventional or certain characteristic targeted pollutants in sewage and wastewater such as carbon, nitrogen, phosphorus, chromaticity, turbidity, algae, and medium and long-chain pollutants that are difficult to biodegrade and remove, and simultaneously realizes the benefits of pollution reduction and carbon reduction, energy saving and consumption reduction. The present invention uses the same system to form a multi-linked variable mode sewage treatment system through pipeline control, so that it can flexibly deal with sewage of different types (working conditions).

[0110] Continue to refer Figure 1, the treatment system according to the present invention may also include a water distribution system. The water distribution system includes an inlet pipeline 11, an internal connecting pipeline and an outlet pipeline. The inlet pipeline 11 includes: a first water inlet pipeline 111 connected to the water inlet end of the first treatment unit. A second water inlet pipeline 112 connected to the water inlet end of the second treatment unit. The internal connecting pipeline includes: a first internal connecting pipeline connected from the water outlet end of the first treatment unit to the water inlet end of the second treatment unit (wherein the first internal connecting pipeline is divided into two sections: a front section 12 before the connection point of the pipeline with the fifth internal connecting pipeline 121, and a rear section 21 after the connection point of the pipeline with the fifth internal connecting pipeline 121). A second internal connecting pipeline 22 connected from the water outlet end of the second treatment unit to the water inlet end of the third treatment unit. A third internal connecting pipeline connected from the water outlet of the third treatment unit to the water inlet of the fourth treatment unit (wherein the third internal connecting pipeline is divided into two sections: the front section 31 of the connection point between the pipeline and the sixth internal connecting pipeline 61, and the rear section 41 of the connection point between the pipeline and the sixth internal connecting pipeline 61). A fourth internal connecting pipeline 42 connected from the water outlet of the fourth treatment unit to the water inlet of the seventh treatment unit. A fifth internal connecting pipeline 121 connected from the water outlet of the first treatment unit to the water inlet of the fourth treatment unit. A sixth internal connecting pipeline 61 connected from the water outlet of the third treatment unit to the water inlet of the sixth treatment unit. A seventh internal connecting pipeline 72 connected from the seventh treatment unit to the water inlet of the second treatment unit. An eighth internal connecting pipeline 44 connected from the fourth treatment unit to the water inlet of the fifth treatment unit. The water outlet pipeline 73 includes: a first water outlet pipeline 64 connected to the water outlet of the sixth treatment unit. A second water outlet pipeline 71 connected to the water outlet of the seventh treatment unit.

[0111] Among them, the first water inlet pipeline, the second water inlet pipeline, the first internal connecting pipeline, the third internal connecting pipeline, the fifth internal connecting pipeline, the sixth internal connecting pipeline, the seventh internal connecting pipeline, the first water outlet pipeline and the second water outlet pipeline are all provided with valves for controlling the opening and closing of the pipeline.

[0112] Specifically, the first water inlet pipeline 111 is provided with a valve a0. The second water inlet pipeline 112 is provided with a valve a1. The front section 12 of the first internal communication pipeline is provided with a valve a2, and the rear section 21 thereof is provided with a valve a3. The front section 31 of the third internal communication pipeline is provided with a valve a5, and the rear section 41 thereof is provided with a valve a6. The fifth internal communication pipeline is provided with a valve a4. The sixth internal communication pipeline is provided with a valve a7. The seventh internal communication pipeline is provided with a valve a10. The first water outlet pipeline is provided with a valve a8. The second water outlet pipeline is provided with a valve a9 for controlling the opening and closing of the pipeline.

[0113] In the illustrated embodiment, the treatment system may include a nitrification liquid circulation system. The nitrification liquid circulation system includes a nitrification liquid circulation pipeline. The nitrification liquid circulation pipeline 32 is connected from the third treatment unit to the first treatment unit. An auxiliary nitrification liquid reflux device b4' is provided on the nitrification liquid circulation pipeline.

[0114] In some embodiments, the treatment system may include a sludge circulation system. The sludge circulation system includes a first sludge circulation pipeline 51 and a second sludge circulation pipeline 62. The first sludge circulation pipeline is connected from the fifth treatment unit to the first treatment unit. The second sludge circulation pipeline is connected from the sixth treatment unit to the first treatment unit and the third treatment unit.

[0115] The first sludge circulation pipeline is provided with a sludge return device b8. The second sludge circulation pipeline is provided with a sludge return device b10. The second sludge circulation pipeline is provided with a valve for controlling the opening and closing of the pipeline. Specifically, the second sludge circulation pipeline 62 is divided into two at a certain position, including a pipeline 622 connected to the first treatment unit and a pipeline 621 connected to the third treatment unit. Valves a11, a12, and a13 are provided on pipeline 62, pipeline 621, and pipeline 622, respectively.

[0116] Furthermore, the treatment system may include a dosing system. The dosing system includes: a first dosing pipeline connected to the second treatment unit. A second dosing pipeline connected to the third treatment unit. The first dosing pipeline and the second dosing pipeline are respectively provided with dosing devices 81 and 82.

[0117] In the illustrated embodiment, the treatment system may include a sludge discharge system, which includes: a first sludge discharge pipeline 52 for discharging excess sludge from the bottom of the fifth treatment unit; and a second sludge discharge pipeline 63 for discharging excess sludge from the bottom of the sixth treatment unit.

[0118] Among them, the first sludge discharge pipeline and the second sludge discharge pipeline are respectively provided with sludge discharge devices b9 and b11.

[0119] The processing system of the present invention is provided with 14 valves (or gates) for regulating and controlling the flow at least at the corresponding unit positions, from a0 to a13. Through the connection and combination of the processing units and the switching and regulation of the valves, many functions can be realized and the adjustment and deployment can be flexibly adjusted. The main deployment modes include the following seven variable modes, such as Figure 2-4 shown.

[0120] (1) Path 1: Unit "1-4-7" is "biochemical reaction tank-biochemical sedimentation unit-water storage tank". That is, sewage enters unit 1 through pipelines 11 and 111 and then flows out. From pipelines 12 and 121, it enters unit 4 for mud-water solid-liquid separation. The upper clear liquid of unit 4 flows out from pipelines 42, unit 7, pipeline 71, and pipeline 73. The bottom sedimentation sludge of unit 4 enters unit 5 through pipeline 44, and the sludge is returned to unit 1 through equipment b8 and pipeline 51 to ensure the balance of the amount of activated sludge in the 1-4 system. Excess sludge in the unit "1-4" system is removed through equipment b9 and pipeline 52. Under this working condition: valves a0, a2, a4, and a9 are in the open state, and equipment b1, b2, b5, b8, and b9 are in operation or intermittent operation.

[0121] (2) Path 2: Unit "2-3-6" is "feeding reaction tank-coagulation reaction tank-precipitation clarification unit". At this time, units 2 and 3 are used as chemical dosing reaction units. Sewage enters units 2 and 3 successively through pipelines 11, 112, 22, 31, 61, 64, and 73 for reaction. Then it flows out through unit 6 to form the upper clear liquid. The bottom sludge of unit 6 is circulated back to unit 3 through equipment b10, pipeline 62, and pipeline 621. The remaining sludge of unit 6 is discharged through equipment b11 and pipeline 63. Under this working condition: valves a1, a5, a7, a8, a11, and a12 are in the open state, and equipment b3, b4, b6, b10, b11, 81, and 82 are in operation or intermittent operation.

[0122] (3) Path 3: Unit “1-2-3-4-7”, which may include the following two modes (Extended Mode I and Extended Mode II):

[0123] Extension mode I: Unit "1-2-3-4-7" is "biochemical reaction tank-feeding reaction tank-coagulation reaction tank-biochemical precipitation unit-water storage tank". At this time, units 2 and 3 are used as chemical dosing reaction units. At this time, sewage enters and exits units "1-2-3-4-7" in sequence through pipelines 11, 111, 12, 21, 22, 31, 41, 42, 71, and 73, and the treated clear liquid flows out. The bottom sedimentation sludge of unit 4 enters unit 5 through pipeline 44, and the sludge is returned to unit 1 through equipment b8 and pipeline 51 to ensure the balance of the amount of activated sludge in the 1-4 system. Excess sludge in the unit "1-4" system is removed through equipment b9 and pipeline 52. Under this condition: valves a0, a2, a3, a5, a6, and a9 are in the open state, and equipment b1, b2, b3, b4, b5, b8, b9, 81, and 82 are in operation or intermittent operation.

[0124] Extension mode II: Unit "1-2-3-4-7" is "biochemical reaction tank-anoxic denitrification reaction tank I or deoxygenation degassing tank I-anoxic denitrification reaction tank II or deoxygenation degassing tank II-biochemical precipitation unit-water storage tank". At this time, when adding external carbon source, units 2 and 3 can be used as inverted anoxic denitrification reaction tanks, or units 2 and 3 are not added with external carbon source and are used as post-deoxygenation degassing tanks of unit 1. At this time, sewage enters and exits units "1-2-3-4-7" in turn through pipelines 11, 111, 12, 21, 22, 31, 41, 42, 71, and 73, and the treated clear liquid flows out. The nitrification mixed liquor of unit 3 is returned to unit 1 through equipment b4' and pipeline 32. The bottom sedimentation sludge of unit 4 enters unit 5 through pipeline 44, and the sludge is returned to unit 1 through equipment b8 and pipeline 51 to ensure the balance of the amount of activated sludge in the unit "1-4" system. Excess sludge in the unit "1-4" system is removed through equipment b9 and pipeline 52. Under this working condition: valves a0, a2, a3, a5, a6, and a9 are in the open state, and equipment b1, b2, b3, b4, b4', b5, b8, b9, 81, and 82 are in operation or intermittent operation.

[0125] (4) Path 4: Unit "1-2-3-6" is "biochemical reaction tank-feeding reaction tank-coagulation reaction tank-precipitation clarification unit". At this time, 2 and 3 are used as chemical dosing reaction units. Under this condition, unit 1 maintains a low adsorption reaction biochemical sludge concentration (MLSS is lower than 1500 mg / L). In order to achieve better results, it is preferred that the first treatment unit maintains MLSS in the activated sludge higher than 600 mg / L but lower than 1500 mg / L, and the ratio of MLVSS to MLSS in the activated sludge is greater than or equal to 0.45. At this time, the sewage enters and exits 1-2-3-6 in sequence through pipelines 11, 111, 12, 21, 22, 31, 61, 64, and 73, and the treated clear liquid flows out. The bottom sludge of unit 6 is circulated back to unit 3 through equipment b10, pipeline 62, and pipeline 621. The remaining sludge of unit 6 is discharged through equipment b11 and pipeline 63. Under this working condition: valves a0, a2, a3, a5, a7, a8, a11, and a12 are in the open state (a13 is intermittently or continuously opened, and sludge is regularly or continuously diverted from the settled sludge layer at the bottom of unit 6 to return sludge to unit 1 through pipeline 622, so as to dynamically balance and maintain a reasonable and appropriate sludge concentration range in unit 1), and equipment b1, b2, b3, b4, b6, b10, b11, 81, and 82 are in operation or intermittent operation.

[0126] (5) Path 5: Unit "1-4-7-2-3-6" is "biochemical reaction tank-biochemical precipitation unit-water storage tank-feeding reaction tank-coagulation reaction tank-precipitation clarification unit", forming a two-stage series of "biochemical treatment + chemical enhancement" efficiency improvement treatment. At this time, 2 and 3 are used as chemical dosing reaction units. At this time, the sewage enters and exits 1-4-7 (after lifting)-2-3-6 through pipelines 11, 111, 12, 121, 42, 72, 22, 31, 61, 64, and 73 in sequence, and the treated clear liquid flows out. The bottom sedimentation sludge of unit 4 enters unit 5 through pipeline 44, and the sludge is returned to unit 1 through equipment b8 and pipeline 51 to ensure the balance of the amount of activated sludge in the 1-4 system. Excess sludge in the 1-4 system is removed through equipment b9 and pipeline 52. The bottom sludge of unit 6 is circulated and returned to unit 3 through equipment b10, pipeline 62, and pipeline 621. The excess sludge of unit 6 is discharged through equipment b11 and pipeline 63. Under this working condition: valves a0, a2, a4, a5, a7, a8, and a10 are in the open state, and equipment b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, 81, and 82 are in operation or intermittent operation.

[0127] (6) Path 6: At this time, units 2 and 3 are used as chemical dosing reaction units, forming a single-stage parallel connection of "biochemical treatment and chemical enhancement" efficiency improvement treatment. Part of the sewage flow of pipeline 11 passes through pipelines 111, 12, 121, 42, 71, and 73, entering and exiting the treatment line of unit "1-4-7". Unit "1-4-7" is "biochemical reaction tank-biochemical precipitation unit-water storage tank". The remaining flow of pipeline 11 passes through pipelines 112, 22, 31, 61, 64, and 73, entering and exiting the treatment line of unit "2-3-6". The treatment line of unit "2-3-6" is "feeding reaction tank-coagulation reaction tank-precipitation clarification unit". The bottom sedimentation sludge of unit 4 enters unit 5 through pipeline 44, and the sludge is returned to unit 1 through equipment b8 and pipeline 51 to ensure the balance of the amount of activated sludge in the 1-4 system; the excess sludge in the 1-4 system is removed through equipment b9 and pipeline 52. In unit 7, the effluent after biochemical precipitation is pumped to unit 2 of the "2-3-6" chemical physicochemical enhancement unit through equipment b7, so as to carry out the subsequent enhanced pollutant treatment of chemical deepening and dosing. The bottom sludge of unit 6 is circulated back to unit 3 through equipment b10, pipeline 62, and pipeline 621. The remaining sludge of unit 6 is discharged through equipment b11 and pipeline 63. Under this working condition: valves a0, a1, a2, a4, a5, a7, a8, a9, a11, and a12 are in the open state, and equipment b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, 81, and 82 are in operation or intermittent operation.

[0128] (7) Path 7: Sewage enters unit 1 (biochemical reaction tank) through pipelines 11 and 111, and flows out after reaction. At this time, part of the outflow of unit 1 enters and exits unit "4-7" (biochemical sedimentation unit-water storage tank) through pipelines 12, 121, 42, 71, and 73. The remaining outflow of unit 1 enters and exits the treatment line of unit "2-3-6" through pipelines 21, 22, 31, 61, 64, and 73, and flows out after treatment. The treatment line of unit "2-3-6" is "feeding reaction tank-coagulation reaction tank-precipitation and clarification unit". The bottom sedimentation sludge of unit 4 enters unit 5 through pipeline 44, and the sludge is returned to unit 1 through equipment b8 and pipeline 51 to ensure the balance of the amount of activated sludge in the 1-4 system. Excess sludge in the 1-4 system is removed through equipment b9 and pipeline 52. The bottom sludge of unit 6 is circulated back to unit 3 through equipment b10, pipeline 62, and pipeline 621. The excess sludge of unit 6 is discharged through equipment b11 and pipeline 63. Under this working condition: valves a0, a2, a3, a4, a5, a7, a8, a9, a11, and a12 are in the open state (a13 is intermittently opened, and sludge is regularly returned from the bottom sedimentation sludge layer of unit 6 to unit 1 through pipeline 622 to dynamically balance and maintain a reasonable and appropriate sludge concentration range of unit 1), and equipment b1, b2, b3, b4, b5, b6, b8, b9, b10, b11, 81, and 82 are in operation or intermittent operation.

[0129] The embodiment of the present invention also provides a multi-link variable mode sewage treatment method, according to the water quality and water quantity load impact working condition of the sewage to be treated, the sewage is made to pass through one of the following sewage treatment paths by opening and closing the pipeline:

[0130] Path 1: The sewage passes through the first treatment unit, the fourth treatment unit and the seventh treatment unit connected in sequence. At this time, the first treatment unit is used as a biochemical reaction pool, and the fourth treatment unit is used as a biochemical precipitation unit. This path can be applied to the scene where pollutants such as carbon / nitrogen / phosphorus are removed by biological treatment means to achieve the treatment benefits of conventional pollutant indicators reaching the emission level A limit standard.

[0131] Path 2: The sewage passes through the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the second treatment unit is used as a feeding reaction tank, the third treatment unit is used as a coagulation reaction tank, and the sixth treatment unit is used as a precipitation and clarification unit. This path can be applied to the scene when the insoluble or difficult to biodegrade medium- and long-chain COD / TP / SS pollutants are removed by chemical precipitation, so as to achieve a removal efficiency of more than 60% for COD (and BOD5), TP, SS and other pollutants and a total pollution reduction guarantee, and to a certain extent improve the removal rate of difficult-to-degrade COD, TP, algae, SS, chromaticity, etc. by more than 10%.

[0132] Path three: The sewage passes through the first treatment unit, the second treatment unit, the third treatment unit, the fourth treatment unit and the seventh treatment unit which are connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the second treatment unit can be flexibly used as a feeding reaction tank, anoxic denitrification reaction tank or anoxic degassing tank, the third treatment unit can be flexibly used as a condensation reaction tank, anoxic denitrification reaction tank or anoxic degassing tank, and the fourth treatment unit is used as a biochemical precipitation unit. This pathway can be applied to scenarios where biological treatment, supplemented by chemical dosing, is used to enhance the removal of conventional or difficult-to-biodegrade medium- and long-chain pollutants and improve the sedimentation effect (especially when encountering water volume or water quality shocks caused by insoluble COD / TP / SS, and poor biochemical sludge sedimentation performance), as well as scenarios where TN pollutants are removed through biological treatment and enhanced denitrification, so as to achieve the treatment benefits of conventional indicators reaching the Class A emission limit standard. At the same time, it can further increase the removal rate of difficult-to-degrade COD, TP, algae, SS, and chroma by 10% to 30%. When operating with excess water volume, the system processing capacity can be increased by 10% to 30%, or the consumption of external carbon source drugs for denitrification can be reduced by more than 10%, corresponding to a reduction of more than 10% in greenhouse gas carbon emission intensity.

[0133] Path 4: The sewage passes through the first treatment unit, the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the second treatment unit is used as a feeding reaction tank, the third treatment unit is used as a coagulation reaction tank, and the sixth treatment unit is used as a sedimentation and clarification unit, and the first treatment unit maintains the MLS in the activated sludge below 1500 mg / L. In order to achieve better results, it is preferred that the first treatment unit maintains the MLSS in the activated sludge above 600 mg / L but below 1500 mg / L, and the ratio of MLVSS to MLSS in the activated sludge is greater than or equal to 0.45. This path can be applied to the scene of removing insoluble or difficult to biodegrade medium- and long-chain COD, TP, SS, chroma and other pollutants by chemical dosing precipitation means, assisted by biological sludge adsorption, to achieve more than 80% removal efficiency of insoluble COD (and BOD5), TP, SS and other pollutants, and to a certain extent improve the removal rate of difficult to degrade COD, TP, algae, SS, chroma and other pollutants by more than 15%. Path 5: The sewage passes through the first treatment unit, the fourth treatment unit, the seventh treatment unit, the second treatment unit, the third treatment unit and the sixth treatment unit, which are connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the fourth treatment unit is used as a biochemical precipitation unit, the second treatment unit is used as a feeding reaction tank, the third treatment unit is a coagulation reaction tank, and the sixth treatment unit is a precipitation clarification unit. This path can be applied to the scenario of strengthening the effluent guarantee of Class V by connecting biological treatment in series with chemical deep dosing means, such as TP or medium- and long-chain pollutants that are difficult to biodegrade and remove. While achieving the treatment benefits of conventional indicators that are better than the quasi-Class V standards of GB3838-2002, it also promotes the removal rate of difficult-to-degrade COD, TP, algae, SS, and chroma to be further increased by 10% to 30%.

[0134] Path 6: Part of the sewage flow passes through the first treatment unit, the fourth treatment unit and the seventh treatment unit connected in sequence, and the remaining sewage flow passes through the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the fourth treatment unit is used as a biochemical precipitation unit, the second treatment unit is used as a feeding reaction tank, the third treatment unit is a coagulation reaction tank, and the sixth treatment unit is a precipitation clarification unit. This path can be applied to the scenario where biological treatment and chemical dosing treatment can be operated independently for the treatment of industrial and domestic sewage. While achieving the governance benefits of conventional indicators reaching the emission level A limit standard, in response to rainfall fluctuations during the flood season, the amount and efficiency can be further increased, the overflow treatment volume can be increased by 15% to 40%, and the removal rate of difficult-to-degrade COD, TP, algae, SS, and chroma can be further increased by 10% to 30%, further improving the efficiency of industrial wastewater single targeted enhanced treatment.

[0135] Path 7: After the sewage passes through the first treatment unit, part of the flow passes through the fourth treatment unit and the seventh treatment unit connected in sequence, and the remaining flow passes through the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the fourth treatment unit is used as a biochemical precipitation unit, the second treatment unit is used as a feeding reaction tank, the third treatment unit is a coagulation reaction tank, and the sixth treatment unit is a precipitation clarification unit. This path can be applied to the scenario of strengthening the effluent guarantee of excellent-A pollutants (especially when excessive treatment is carried out during the flood season) through biological treatment, supplemented by biological adsorption coupled with chemical deep dosing (for conventional insoluble or difficult to biodegrade and remove medium- and long-chain pollutants through dosing and dosing precipitation). At the same time, the conventional indicators are better than the GB3838-2002 quasi-V standard. When the rainfall fluctuates during the flood season, the amount and efficiency can be further increased, the overflow treatment volume can be increased by 20% to 50%, and the removal rate of difficult-to-degrade COD, TP, algae, SS, and chroma can be further increased by 20% to 40%.

[0136] According to the multi-link variable mode sewage efficiency improvement treatment method of the present invention, according to the different water quality and water volume load impact working conditions of the sewage to be treated, the corresponding sewage treatment path can be flexibly formed by opening and closing the pipeline, realizing the microbial biochemical reaction, efficient nitrogen and phosphorus removal, efficient precipitation separation, biological mud phase adsorption, dosing enhancement and other efficiency improvement functions in one, greatly promoting the increase in quantity and efficiency of sewage purification, improving quality and efficiency, and having strong resistance to water volume and water quality impact load, simple process operation, and various operation modes and flexible switching. For conventional or certain characteristic targeted pollutants in sewage and wastewater such as carbon, nitrogen, phosphorus, chromaticity, turbidity, algae, and medium and long-chain pollutants that are difficult to biodegrade and remove, multi-effect synergistic and efficient removal is achieved, and pollution reduction and carbon reduction, energy saving and consumption reduction benefits are achieved simultaneously. The present invention uses the same system to form a multi-link variable multi-mode sewage treatment system through pipeline control, so that different types (working conditions) of sewage can be flexibly responded to.

[0137] Preferably, the hydraulic retention time of the second treatment unit can be limited to 5 to 30 minutes. The hydraulic retention time of the third treatment unit can be limited to 5 to 30 minutes. The hydraulic retention time of the sixth treatment unit can be limited to 15 to 45 minutes.

[0138] It should be noted that the above embodiments illustrate the present application rather than limit the present application, and that those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be constructed as a limitation to the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of multiple such elements. In a unit claim that lists several devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

[0139] The above is only a specific implementation or description of a specific implementation of the present application, and the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A multi-mode sewage treatment system, characterized in that: The processing system comprises: A plurality of treatment units connected by pipelines with controllable switches; the plurality of treatment units include a sewage biochemical main reaction unit and at least one of the following treatment units: a variable mode unit for a first sewage biochemical reaction or a physicochemical dosing reaction, a variable mode unit for a second sewage biochemical reaction or a physicochemical dosing reaction, a sedimentation and separation unit, an activated sludge return and excess sludge removal unit, a water storage tank, and a sewage lifting functional unit; The plurality of processing units are configured to be configured in different working modes based on pre-selected functions; the working modes include at least one of the following modes: The first path mode: biochemical reaction tank-biochemical precipitation unit-water storage tank mode; The second path mode: feeding reaction tank - coagulation reaction tank - precipitation clarification unit mode; The third path mode: biochemical reaction tank - feeding reaction tank - coagulation reaction tank - biochemical precipitation unit - water storage tank; The third expansion path mode: biochemical reaction tank - anoxic denitrification reaction tank I or deoxygenation and degassing tank I - anoxic denitrification reaction tank II or deoxygenation and degassing tank II - biochemical precipitation unit - water storage tank; The fourth path mode: biochemical reaction tank - feeding reaction tank - coagulation reaction tank - precipitation clarification unit; Fifth path mode: a serial coupling mode of the first path mode and the second path mode, biochemical reaction tank - biochemical precipitation unit - water storage tank - feeding reaction tank - coagulation reaction tank - precipitation clarification unit; Sixth path mode: a parallel coupling mode of the first path mode and the second path mode, that is, a biochemical reaction tank-biochemical precipitation unit-water storage tank mode and a feeding reaction tank-coagulation reaction tank-precipitation clarification unit parallel mode; Seventh path mode: a hybrid coupling mode of the first path mode and the second path mode.

2. The processing system according to claim 1, characterized in that The processing system comprises: A first treatment unit, wherein the front end of the first treatment unit is filled with sewage, and the first treatment unit is constructed as a sewage biochemical main reaction unit; the first treatment unit is provided with at least an anaerobic reaction zone and an aerobic reaction zone, the anaerobic reaction zone is provided with a stirring power device, and the aerobic reaction zone is provided with an aeration device; A second treatment unit, the second treatment unit is constructed as a variable mode unit for sewage biochemical reaction or physicochemical dosing reaction; the second treatment unit is provided with a stirring power device and a dosing device for dosing water treatment purifiers including coagulants, adsorbents and / or oxidants; The third treatment unit is constructed as a variable mode unit for sewage biochemical reaction or physicochemical dosing reaction; the third treatment unit is provided with a stirring power device, an auxiliary nitrification liquid reflux device and a dosing device for dosing a water treatment coagulant; A fourth treatment unit, the fourth treatment unit being configured as a sedimentation and separation unit for activated sludge and treated sewage, and the fourth treatment unit being provided with a sludge scraping device; A fifth treatment unit, wherein the fifth treatment unit is constructed as an activated sludge return and excess sludge removal unit, and the fifth treatment unit is provided with a sludge return device and a sludge discharge device; a sixth treatment unit, the sixth treatment unit being configured as a sedimentation and separation unit for sludge and treated sewage, the sixth treatment unit being provided with a sludge scraping device, a sludge return device and a sludge discharge device; and The seventh treatment unit is constructed as a water storage tank, and the seventh treatment unit is provided with a sewage pressure boosting device.

3. The processing system according to claim 2, characterized in that ； Wherein, the first treatment unit, the second treatment unit, the third treatment unit, the fourth treatment unit, the fifth treatment unit, the sixth treatment unit and the seventh treatment unit are connected by pipelines and can flexibly form at least one of the following sewage treatment paths: The sewage passes through the first treatment unit, the fourth treatment unit and the seventh treatment unit connected in sequence, at which time the first treatment unit is used as a biochemical reaction tank, and the fourth treatment unit is used as a biochemical precipitation unit; The sewage passes through the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the second treatment unit is used as a feeding reaction tank, the third treatment unit is used as a coagulation reaction tank, and the sixth treatment unit is used as a sedimentation and clarification unit; The sewage passes through the first treatment unit, the second treatment unit, the third treatment unit, the fourth treatment unit and the seventh treatment unit connected in sequence, at which time the first treatment unit is used as a biochemical reaction tank, the second treatment unit can be flexibly used as a feeding reaction tank, anoxic denitrification reaction tank or an oxygen removal and degassing tank, the third treatment unit can be flexibly used as a condensation reaction tank, anoxic denitrification reaction tank or an oxygen removal and degassing tank, and the fourth treatment unit is used as a biochemical precipitation unit; The sewage passes through the first treatment unit, the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the second treatment unit is used as a feeding reaction tank, the third treatment unit is used as a coagulation reaction tank, and the sixth treatment unit is used as a sedimentation and clarification unit; The sewage passes through the first treatment unit, the fourth treatment unit, the seventh treatment unit, the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the fourth treatment unit is used as a biochemical precipitation unit, the second treatment unit is used as a feeding reaction tank, the third treatment unit is a coagulation reaction tank, and the sixth treatment unit is a precipitation clarification unit; Part of the flow of sewage passes through the first treatment unit, the fourth treatment unit and the seventh treatment unit connected in sequence, and the remaining flow of sewage passes through the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the fourth treatment unit is used as a biochemical precipitation unit, the second treatment unit is used as a feeding reaction tank, the third treatment unit is a coagulation reaction tank, and the sixth treatment unit is a precipitation and clarification unit; After the sewage passes through the first treatment unit, part of the flow passes through the fourth treatment unit and the seventh treatment unit connected in sequence, and the remaining flow passes through the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the fourth treatment unit is used as a biochemical precipitation unit, the second treatment unit is used as a feeding reaction tank, the third treatment unit is a coagulation reaction tank, and the sixth treatment unit is a sedimentation and clarification unit.

4. The processing system according to claim 3, characterized in that The treatment system comprises a water distribution system, and the water distribution system comprises a water inlet pipeline, an internal connecting pipeline and a water outlet pipeline; The water inlet pipeline comprises: a first water inlet pipeline connected to the water inlet end of the first processing unit; a second water inlet pipeline connected to the water inlet end of the second processing unit; The internal connecting pipeline includes: a first internal connecting pipeline connected from the water outlet of the first treatment unit to the water inlet of the second treatment unit; a second internal connecting pipeline connected from the water outlet of the second treatment unit to the water inlet of the third treatment unit; a third internal connecting pipeline connected from the water outlet of the third treatment unit to the water inlet of the fourth treatment unit; a fourth internal connecting pipeline connected from the water outlet of the fourth treatment unit to the water inlet of the seventh treatment unit; a fifth internal connecting pipeline connected from the water outlet of the first treatment unit to the water inlet of the fourth treatment unit; a sixth internal connecting pipeline connected from the water outlet of the third treatment unit to the water inlet of the sixth treatment unit; a seventh internal connecting pipeline connected from the seventh treatment unit to the water inlet of the second treatment unit; and an eighth internal connecting pipeline connected from the fourth treatment unit to the water inlet of the fifth treatment unit. The water outlet pipeline includes: a first water outlet pipeline connected to the water outlet end of the sixth processing unit; a second water outlet pipeline connected to the water outlet end of the seventh processing unit; The first water inlet pipeline, the second water inlet pipeline, the first internal connecting pipeline, the third internal connecting pipeline, the fifth internal connecting pipeline, the sixth internal connecting pipeline, the seventh internal connecting pipeline, the first water outlet pipeline and the second water outlet pipeline are all provided with valves for controlling the opening and closing of the pipelines.

5. The processing system according to claim 3 or 4, characterized in that: The treatment system comprises a nitrifying liquid circulation system, and the nitrifying liquid circulation system comprises a nitrifying liquid circulation pipeline; the nitrifying liquid circulation pipeline is connected from the third treatment unit to the first treatment unit, and the auxiliary nitrifying liquid reflux device is arranged on the nitrifying liquid circulation pipeline.

6. The processing system according to claim 3 or 4, characterized in that: The treatment system includes a sludge circulation system, and the sludge circulation system includes a first sludge circulation pipeline and a second sludge circulation pipeline; The first sludge circulation pipeline is connected from the fifth treatment unit to the first treatment unit, and the second sludge circulation pipeline is connected from the sixth treatment unit to the first treatment unit and the third treatment unit; The first sludge circulation pipeline is provided with the sludge return device, the second sludge circulation pipeline is provided with the sludge return device, and the second sludge circulation pipeline is provided with a valve for controlling the opening and closing of the pipeline.

7. The processing system according to claim 3 or 4, characterized in that: The treatment system includes a dosing system, and the dosing system includes: a first dosing pipeline connected to the second treatment unit; a second dosing pipeline connected to the third treatment unit; Wherein, the first dosing pipeline and the second dosing pipeline are respectively provided with dosing devices.

8. The processing system according to claim 3 or 4, characterized in that: The treatment system includes a mud discharge system, and the mud discharge system includes: a first mud discharge pipeline for discharging excess sludge from the bottom of the fifth treatment unit; a second mud discharge pipeline for discharging excess sludge from the bottom of the sixth treatment unit; Wherein, the first sludge discharge pipeline and the second sludge discharge pipeline are respectively provided with sludge discharge devices.

9. A processing method using the processing system according to any one of claims 3 to 8, characterized in that: According to the water quality and quantity load impact conditions of the sewage to be treated, the sewage is allowed to pass through one of the following sewage treatment paths by opening and closing the pipeline: Path 1: The sewage passes through the first treatment unit, the fourth treatment unit and the seventh treatment unit connected in sequence, at which time the first treatment unit is used as a biochemical reaction tank, and the fourth treatment unit is used as a biochemical precipitation unit; Path 2: The sewage passes through the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the second treatment unit is used as a feeding reaction tank, the third treatment unit is used as a coagulation reaction tank, and the sixth treatment unit is used as a sedimentation and clarification unit; Path three: The sewage passes through the first treatment unit, the second treatment unit, the third treatment unit, the fourth treatment unit and the seventh treatment unit connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the second treatment unit can be flexibly used as a feeding reaction tank, anoxic denitrification reaction tank or anoxic degassing tank, the third treatment unit can be flexibly used as a condensation reaction tank, anoxic denitrification reaction tank or anoxic degassing tank, and the fourth treatment unit is used as a biochemical precipitation unit; Path 4: The sewage passes through the first treatment unit, the second treatment unit, the third treatment unit and the sixth treatment unit which are connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the second treatment unit is used as a feeding reaction tank, the third treatment unit is used as a coagulation reaction tank, and the sixth treatment unit is used as a sedimentation and clarification unit. The first treatment unit maintains the MLSS in the activated sludge below 1500 mg / L. Path 5: The sewage passes through the first treatment unit, the fourth treatment unit, the seventh treatment unit, the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the fourth treatment unit is used as a biochemical precipitation unit, the second treatment unit is used as a feeding reaction tank, the third treatment unit is a coagulation reaction tank, and the sixth treatment unit is a precipitation clarification unit; Path six: Part of the sewage flow passes through the first treatment unit, the fourth treatment unit and the seventh treatment unit connected in sequence, and the remaining sewage flow passes through the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the fourth treatment unit is used as a biochemical precipitation unit, the second treatment unit is used as a feeding reaction tank, the third treatment unit is a coagulation reaction tank, and the sixth treatment unit is a precipitation clarification unit; Path seven: After the sewage passes through the first treatment unit, part of the flow passes through the fourth treatment unit and the seventh treatment unit connected in sequence, and the remaining flow passes through the second treatment unit, the third treatment unit and the sixth treatment unit connected in sequence. At this time, the first treatment unit is used as a biochemical reaction tank, the fourth treatment unit is used as a biochemical precipitation unit, the second treatment unit is used as a feeding reaction tank, the third treatment unit is a coagulation reaction tank, and the sixth treatment unit is a sedimentation and clarification unit.

10. The processing method according to claim 9, characterized in that: The hydraulic retention time of the second treatment unit is limited to 5 to 30 minutes, the hydraulic retention time of the third treatment unit is limited to 5 to 30 minutes, and the hydraulic retention time of the sixth treatment unit is limited to 15 to 45 minutes.

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