Urban sewage treatment system for coupling flat reverse osmosis membrane concentration and biological treatment

Abstract

According to the urban sewage treatment system for coupling flat plate reverse osmosis membrane concentration and biological treatment, a flat plate membrane reverse osmosis technology is applied to domestic sewage treatment, and the domestic sewage is effectively treated. After the domestic sewage is subjected to membrane concentration, the amount of water entering the biological treatment unit is greatly reduced, so that the problem of unstable treatment caused by a large amount of sewage in biological treatment is effectively relieved; the concentration of a carbon source in water is obviously increased after the sewage is concentrated, the addition of the carbon source in biological treatment is saved, the biological treatment efficiency is improved by concentrated treatment after concentration, the water inlet quantity of the biological treatment is greatly reduced, the investment cost is reduced, and economic benefits and social benefits are really realized; concentrated water of the flat membrane reverse osmosis concentration unit is directly recycled and discharged after being subjected to biological rear-end treatment and the like, so that an original reflux system is reduced, and a process route is shortened; reverse osmosis produced water can directly reach the standard for reuse, and can be used for industrial production, living and the like to reduce consumption of surface water and underground water.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of flat plate reverse osmosis membrane concentration coupling biological treatment's municipal wastewater treatment system, belong to wastewater treatment technical field. BACKGROUND

[0002] With the increase of urban population, domestic sewage discharge is increasing, and water pollution is increasing. Current advanced sewage treatment technology requires a large amount of upfront capital, and the pressure on sewage treatment funds is large, and it is difficult to realize the update iteration of advanced technology in the short term. Because the urban sewage is greatly affected by the local population and industrial structure, the water quality of sewage will change greatly due to the influence of factors such as the size and nature of the city. At the same time, the water volume of sewage changes greatly due to the influence of population flow and seasonal changes.

[0003] Domestic sewage has the characteristics of high COD, high suspended solids, high color, high organic matter concentration and high nitrogen and phosphorus source. Due to the complexity of domestic sewage composition, large water quality fluctuation and large water volume, it is difficult to be treated. Traditional domestic sewage treatment includes pretreatment + biological treatment + membrane concentration + activated carbon filtration + advanced oxidation technology such as ozone oxidation + concentrated water reflux + secondary sedimentation + disinfection discharge. Biological treatment receives all sewage at the front end of the process, and the required equipment occupies a large area. The front-end biological treatment is greatly affected by water quality fluctuation, and the equipment operating parameters need to be adjusted frequently to ensure the normal operation of the equipment. Due to the large treatment volume of biological treatment, a large amount of carbon source needs to be supplemented when the carbon source is insufficient. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of flat plate reverse osmosis membrane concentration coupling biological treatment's municipal wastewater treatment system in view of the deficiency of prior art, solve the problem that the required equipment occupies large area in traditional technology, need to adjust equipment operating parameters frequently to ensure the normal operation of the equipment, when carbon source is insufficient, a large amount of carbon source needs to be supplemented.

[0005] The technical scheme for solving the above technical problems of the utility model is as follows: a kind of flat plate reverse osmosis membrane concentration coupling biological treatment's municipal wastewater treatment system, including raw water pool, oil separation tank, hard and turbidity removal sterilization unit, filtration unit, flat plate membrane reverse osmosis concentration unit, biological treatment unit and secondary sedimentation tank;

[0006] The raw water pool is connected to the oil separation tank by a conveying pipeline, and the raw water pool is used to store domestic sewage to be treated. The oil separation tank is used to remove oil from the domestic sewage delivered by the raw water pool.

[0007] The oil separation tank is connected to the hard and turbidity removal sterilization unit by a conveying pipeline, and the hard and turbidity removal sterilization unit is used to purify and pretreat the domestic sewage delivered by the oil separation tank after removing oil.

[0008] The hardening and turbidity removing sterilization unit is connected with the filtering unit through a conveying pipeline, and the filtering unit is used for filtering the received domestic sewage which is pretreated and purified by the hardening and turbidity removing sterilization unit;

[0009] The filtering unit is connected with the flat-plate membrane reverse osmosis concentration unit through a conveying pipeline, and the flat-plate membrane reverse osmosis concentration unit is used for concentrating and reducing the volume of the received filtered domestic sewage conveyed by the filtering unit;

[0010] The concentrated water outlet of the flat-plate membrane reverse osmosis concentration unit is connected with the biological treatment unit through a conveying pipeline, and the biological treatment unit is used for biologically treating the concentrated water conveyed by the concentrated water outlet of the flat-plate membrane reverse osmosis concentration unit;

[0011] The biological treatment unit is connected with the secondary sedimentation tank through a conveying pipeline, and the secondary sedimentation tank is used for separating sludge and water by sedimentation of the concentrated water biologically treated by the biological treatment unit.

[0012] As a preferred scheme of the urban sewage treatment system of flat-plate reverse osmosis membrane concentration coupled with biological treatment, a first lifting pump is arranged on the conveying pipeline between the raw water tank and the oil separation tank, and the domestic sewage to be treated stored in the raw water tank is conveyed to the oil separation tank through the first lifting pump.

[0013] As a preferred scheme of the urban sewage treatment system of flat-plate reverse osmosis membrane concentration coupled with biological treatment, a coagulant, a coagulant inhibitor and a softening agent are added to the hardening and turbidity removing sterilization unit.

[0014] As a preferred scheme of the urban sewage treatment system of flat-plate reverse osmosis membrane concentration coupled with biological treatment, a reverse osmosis water outlet pipeline is connected to the water outlet of the flat-plate membrane reverse osmosis concentration unit, and the reverse osmosis water outlet pipeline is used for industrial production and life use of the reverse osmosis water produced by the water outlet.

[0015] As a preferred scheme of the urban sewage treatment system of flat-plate reverse osmosis membrane concentration coupled with biological treatment, a second lifting pump is arranged on the conveying pipeline between the flat-plate membrane reverse osmosis concentration unit and the biological treatment unit, and the concentrated water of the concentrated water outlet of the flat-plate membrane reverse osmosis concentration unit is conveyed to the biological treatment unit through the second lifting pump.

[0016] As a preferred scheme of the urban sewage treatment system of flat-plate reverse osmosis membrane concentration coupled with biological treatment, a sludge treatment unit is further included, the biological treatment unit is connected with the sludge treatment unit through a conveying pipeline, and the sludge treatment unit is used for treating the sludge biologically treated by the biological treatment unit.

[0017] The urban sewage treatment system of flat-plate reverse osmosis membrane concentration coupled with biological treatment has the following beneficial effects:

[0018] The flat plate membrane reverse osmosis technology is applied to the treatment of domestic sewage, and the domestic sewage is effectively treated. After the domestic sewage is concentrated by the membrane, the water quantity entering the biological treatment unit is greatly reduced, and the problem of unstable treatment caused by large sewage volume in the biological treatment is effectively alleviated. The concentration of the carbon source in the sewage after concentration is obviously increased, the addition of the carbon source in the biological treatment is saved, the concentrated centralized treatment improves the biological treatment efficiency, greatly reduces the water quantity of the biological treatment, reduces the investment cost, and truly realizes economic benefit and social benefit. The concentrated water of the flat plate membrane reverse osmosis concentration unit is directly reused and discharged after being treated by the biological rear-end treatment, the original reflux system is reduced, and the process route is shortened. The reverse osmosis water can be directly reused up to the standard, and can be used for industrial production, life and the like to reduce the consumption of surface water and underground water. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be derived from the provided drawings without creative labor.

[0020] The structures, proportions, sizes and the like shown in the specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and do not define the limiting conditions for the implementation of the present application, so they do not have technical substantive significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0021] Figure 1 The flat plate reverse osmosis membrane concentration coupled biological treatment urban sewage treatment system schematic diagram provided in the embodiments of the present application;

[0022] Figure 2 The flat plate reverse osmosis membrane concentration coupled biological treatment urban sewage treatment system principle schematic diagram provided in the embodiments of the present application.

[0023] In the figure, 1 is a raw water tank, 2 is an oil separation tank, 3 is a hardening and turbidity removal and sterilization unit, 4 is a filtering unit, 5 is a flat plate membrane reverse osmosis concentration unit, 6 is a biological treatment unit, 7 is a secondary sedimentation tank, and 8 is a sludge treatment unit. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purpose, features and advantages of the present application more apparent, understandable and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways other than those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0026] Referring to Figure 1 and Figure 2 , the present application provides a kind of flat plate reverse osmosis membrane concentration coupling biological treatment urban sewage treatment system, including raw water pool 1, oil separation tank 2, hard removal turbidity sterilization unit 3, filtration unit 4, flat plate membrane reverse osmosis concentration unit 5, biological treatment unit 6 and secondary sedimentation tank 7;

[0027] Wherein, the raw water pool 1 is connected by conveying pipeline the oil separation tank 2, the raw water pool 1 is used to store sewage to be handled;The oil separation tank 2 is used to remove oil for the sewage received by the raw water pool 1 delivery;The oil separation tank 2 is connected by conveying pipeline the hard removal turbidity sterilization unit 3, the hard removal turbidity sterilization unit 3 is used to purify and pretreat for the sewage received by the oil separation tank 2 delivery after removing oil;

[0028] Wherein, the hard removal turbidity sterilization unit 3 is connected by conveying pipeline the filtration unit 4, the filtration unit 4 is used to filter for the sewage received by the hard removal turbidity sterilization unit 3 delivery after purifying and pretreating;The filtration unit 4 is connected by conveying pipeline the flat plate membrane reverse osmosis concentration unit 5, the flat plate membrane reverse osmosis concentration unit 5 is used to concentrate and reduce for the sewage received by the filtration unit 4 delivery after filtering;

[0029] Wherein, the concentrated water outlet of the flat plate membrane reverse osmosis concentration unit 5 is connected by conveying pipeline the biological treatment unit 6, the biological treatment unit 6 is used to biologically treat for the concentrated water received by the concentrated water outlet of the flat plate membrane reverse osmosis concentration unit 5 delivery;The biological treatment unit 6 is connected by conveying pipeline the secondary sedimentation tank 7, the secondary sedimentation tank 7 is used to separate sludge and water for the concentrated water received by the biological treatment unit 6 after biological treatment.

[0030] In the embodiment, a first lifting pump is arranged on the conveying pipeline between the raw water tank 1 and the oil separation tank 2, and the raw sewage stored in the raw water tank 1 is conveyed to the oil separation tank 2 by the first lifting pump; the coagulant, the coagulant inhibitor and the softening agent are added in the hardness and turbidity removal and sterilization unit 3.

[0031] Specifically, the sewage is removed of oil in the oil separation tank 2, and is sterilized and disinfected by the coagulant, the coagulant inhibitor and the softening agent in the hardness and turbidity removal and sterilization unit 3, and the sewage after removal of hardness, turbidity, sterilization and disinfection, and removal of oil and certain hardness and turbidity can reach the membrane inlet condition.

[0032] In the embodiment, the water outlet of the flat sheet membrane reverse osmosis concentration unit 5 is connected with a reverse osmosis water outlet pipeline, which is used for industrial production and life use of the reverse osmosis water produced by the water outlet; a second lifting pump is arranged on the conveying pipeline between the flat sheet membrane reverse osmosis concentration unit 5 and the biological treatment unit 6, and the concentrated water of the concentrated water outlet of the flat sheet membrane reverse osmosis concentration unit 5 is conveyed to the biological treatment unit 6 by the second lifting pump; and a sludge treatment unit 8 is further included, and the biological treatment unit 6 is connected with the sludge treatment unit 8 through a conveying pipeline, and the sludge treatment unit 8 is used for treating the sediment sludge after biological treatment of the biological treatment unit 6.

[0033] Specifically, the pretreated sewage enters the filtering unit 4, and then enters the flat sheet membrane reverse osmosis concentration unit 5 for concentration and reduction treatment after filtering by the filtering unit 4, and the reverse osmosis water can reach the reuse standard, and the reused water can be used for industrial production and life. The reverse osmosis concentrated water enters the biological treatment unit 6 through the second lifting pump for biological treatment of the concentrated water. The water produced by the biological treatment unit 6 enters the secondary sedimentation tank 7 for sludge and water separation, so that the mixed liquid is clarified and the sludge is concentrated. The sludge concentrated by the secondary sedimentation tank 7 enters the sludge treatment unit 8 for sludge treatment, and the water outlet of the secondary sedimentation tank 7 is discharged after sterilization treatment.

[0034] The flat sheet membrane reverse osmosis concentration unit 5 applies the flat sheet membrane reverse osmosis technology to the treatment of sewage, and effectively treats the sewage. After the sewage is concentrated by the membrane, the water quantity entering the biological treatment unit 6 is greatly reduced, effectively solving the problem of unstable treatment caused by large sewage quantity in the biological treatment. The concentration of carbon source in the water is obviously increased after the sewage is concentrated, the addition of carbon source in the biological treatment is saved, the concentrated centralized treatment improves the biological treatment efficiency, greatly reduces the water quantity of the biological treatment, reduces the investment cost, and truly realizes the economic benefit and social benefit. The reverse osmosis water can be directly reused, and can be used for industrial production and life to reduce the consumption of surface water and underground water.

[0035] The principle of the biological treatment unit 6 mainly includes aerobic treatment and anaerobic treatment. The aerobic treatment is to decompose organic matters in water into carbon dioxide, ammonia and water by using aerobic microorganisms under the condition that the sewage contains sufficient dissolved oxygen. The anaerobic treatment is to decompose organic matters in water into methane, carbon dioxide, hydrogen sulfide, nitrogen and water by using anaerobic microorganisms under the condition that the sewage lacks oxygen. Microorganisms play a role in removing dissolved organic matter in biological treatment: converting organic matter into carbon dioxide and water. Precipitation or degradation is carried out by substances such as extracellular polymers produced by microorganisms, which have flocculation effect. Toxic and harmful refractory organic matter is preliminarily decomposed or partially degraded, and the toxicity is reduced or completely converted into inorganic matter.

[0036] It should be noted that the raw water tank 1, the grease trap 2, the hardness and turbidity removal and sterilization unit 3, the filtration unit 4, the flat membrane reverse osmosis concentration unit 5, the biological treatment unit 6, the secondary sedimentation tank 7 and the sludge treatment unit 8 have related technologies in their own structural design, which will not be described here. The innovation of the present scheme lies in the organic combination of these technologies.

[0037] In summary, the domestic sewage is removed of grease by the grease trap 2, and sterilized and disinfected by the coagulant, the coagulation inhibitor and the softening agent in the hardness and turbidity removal and sterilization unit 3, and the hardness and the suspended solids are removed. The sewage after sterilization and disinfection, grease removal and removal of a certain hardness and suspended solids can meet the membrane inlet conditions. The pretreated domestic sewage enters the filtration unit 4, and then enters the flat membrane reverse osmosis concentration unit 5 for concentration and reduction treatment after filtration. The reverse osmosis water can meet the reuse standard, and the reuse water can be used for industrial production and life. The reverse osmosis concentrated water enters the biological treatment unit 6 through the second lifting pump for biological treatment. The water produced by the biological treatment unit 6 enters the secondary sedimentation tank 7 for sludge-water separation, so that the mixed liquid is clarified and the sludge is concentrated. The sludge concentrated by the secondary sedimentation tank 7 enters the sludge treatment unit 8 for sludge treatment, and the effluent from the secondary sedimentation tank 7 is discharged after sterilization treatment. The flat membrane reverse osmosis technology is applied to the treatment of domestic sewage in the present utility model, and the domestic sewage is effectively treated. After the domestic sewage is concentrated by the membrane, the water quantity entering the biological treatment unit 6 is greatly reduced, which effectively alleviates the problem of unstable treatment caused by large sewage volume in biological treatment. After the sewage is concentrated, the concentration of carbon source in the water is significantly increased, the addition of carbon source in biological treatment is saved, the concentrated centralized treatment improves the biological treatment efficiency, greatly reduces the water quantity of the biological treatment, reduces the investment cost, truly realizes the economic benefit and social benefit; the reverse osmosis concentrated water of the flat membrane reverse osmosis concentration unit 5 is directly reused and discharged after biological end treatment, which reduces the original reflux system and shortens the process route; the reverse osmosis water can directly meet the standard for reuse, and can be used for industrial production, life and the like to reduce the consumption of surface water and underground water.

[0038] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, as long as the combination of the technical features does not exist in contradiction, it shall be considered as within the scope of the present disclosure.

[0039] The above-described embodiments only express several implementation manners of the present application, the description is relatively specific and detailed, but it shall not be understood as a limitation on the scope of the present application patent. It should be pointed out that, for ordinary skilled in the art, under the premise of not departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent shall be subject to the appended claims.

Claims

1. A municipal wastewater treatment system of flat sheet reverse osmosis membrane concentration coupled with biological treatment, characterized in that, The device comprises a raw water pool (1), an oil separation pool (2), a hard and turbidity removal and sterilization unit (3), a filtration unit (4), a flat membrane reverse osmosis concentration unit (5), a biological treatment unit (6) and a secondary sedimentation tank (7). The raw water pool (1) is connected with the oil separation pool (2) through a conveying pipeline, and the raw water pool (1) is used for storing domestic sewage to be treated. The oil separation pool (2) is connected with the hard and turbidity removal and sterilization unit (3) through a conveying pipeline, and the oil separation pool (2) is used for removing oil from the domestic sewage conveyed from the raw water pool (1). The hard and turbidity removal and sterilization unit (3) is connected with the filtration unit (4) through a conveying pipeline, and the hard and turbidity removal and sterilization unit (3) is used for purifying and pretreating the domestic sewage conveyed from the oil separation pool (2) after the oil is removed. The filtration unit (4) is connected with the flat membrane reverse osmosis concentration unit (5) through a conveying pipeline, and the filtration unit (4) is used for filtering the domestic sewage conveyed from the hard and turbidity removal and sterilization unit (3) after the purifying and pretreating. The flat membrane reverse osmosis concentration unit (5) is connected with the biological treatment unit (6) through a conveying pipeline, and the flat membrane reverse osmosis concentration unit (5) is used for concentrating and reducing the volume of the domestic sewage conveyed from the filtration unit (4) after the filtering. The biological treatment unit (6) is connected with the secondary sedimentation tank (7) through a conveying pipeline, and the secondary sedimentation tank (7) is used for separating the sludge from the concentrated water conveyed from the biological treatment unit (6) after the biological treatment.

2. The urban sewage treatment system of claim 1, wherein, A first lifting pump is arranged on the conveying pipeline between the raw water pool (1) and the oil separation pool (2), and the domestic sewage to be treated stored in the raw water pool (1) is conveyed to the oil separation pool (2) through the first lifting pump.

3. The urban sewage treatment system of claim 1, wherein the flat sheet reverse osmosis membrane concentration coupled biological treatment is characterized by, A coagulant, a coagulant inhibitor and a softening agent are added into the hard and turbidity removal and sterilization unit (3).

4. The urban sewage treatment system of claim 1, wherein the flat sheet reverse osmosis membrane concentration coupled biological treatment is characterized by, A reverse osmosis water outlet pipeline is connected with a water outlet of the flat membrane reverse osmosis concentration unit (5), and the reverse osmosis water outlet pipeline is used for industrial production and life use of the reverse osmosis water produced by the water outlet.

5. The urban sewage treatment system of claim 1, wherein the flat sheet reverse osmosis membrane concentration coupled biological treatment is characterized by, A second lifting pump is arranged on the conveying pipeline between the flat membrane reverse osmosis concentration unit (5) and the biological treatment unit (6), and the concentrated water of the concentrated water outlet of the flat membrane reverse osmosis concentration unit (5) is conveyed to the biological treatment unit (6) through the second lifting pump.

6. The urban sewage treatment system of flat sheet reverse osmosis membrane concentration coupled biological treatment according to claim 1, characterized in that, A sludge treatment unit (8) is further arranged, and the biological treatment unit (6) is connected with the sludge treatment unit (8) through a conveying pipeline, and the sludge treatment unit (8) is used for treating the sludge separated from the concentrated water after the biological treatment of the biological treatment unit (6).

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