Sewage treatment system for multi-effect anaerobic reaction

Abstract

The utility model relates to the field of sewage treatment, and discloses a multi-effect anaerobic reaction sewage treatment system which comprises a reactor, a water distribution disc, a solid-liquid separator, a three-phase separator, a water outlet tank, a breather pipe, a gas collection chamber, a water inlet pipe, a circulating pipe, a circulating pump, a water outlet pipe, an exhaust pipe and the like. The mixed liquid is degassed under the action of the solid-liquid separator and the three-phase separator, the generated biogas enters the gas collection chamber and then is discharged out of the reactor, the degassed mixed liquid sludge is further separated in the three-phase separator, the sludge is precipitated and then returns to the lower reaction zone, the clarified effluent flows out of the reactor, and the effluent is recycled by combining with the external effluent recycling part, so that the effluent is recycled. The liquid in the reactor is kept at a proper and stable ascending velocity, so that the granular sludge is fully expanded, the contact between the sewage and microorganisms is enhanced, the mass transfer efficiency is improved, and the efficient and economical treatment effect is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a sewage treatment system with multiple-effect anaerobic reactions. Technical Background

[0002] As the country pays more and more attention to environmental protection, many enterprises are increasing their investment in technology and funds for wastewater terminal treatment. Anaerobic wastewater treatment technology is playing an increasingly important role in wastewater treatment due to its advantages of low operating cost, energy saving, and easy sludge treatment.

[0003] The more common anaerobic processes include UASB anaerobic process and IC anaerobic process.

[0004] The biggest difference between UASB and IC in operation is in the resistance to shock loads. The outstanding advantages of UASB are long hydraulic retention time, high removal rate, and relatively stable effluent quality. The disadvantage is that the sludge layer in UASB is a relatively fixed bed. Due to the low rising velocity, the granular sludge is in a relatively dense state, so its water distribution is not particularly uniform, the mass transfer effect is average, and the volumetric load is low.

[0005] The advantage of IC is that it can automatically dilute the influent through internal circulation, effectively ensuring the stability of the influent concentration of the first reaction chamber. Secondly, when the biodegradability of the sewage is good, it only requires a short residence time to achieve the ideal treatment effect for the wastewater with good biodegradability. In addition, the IC process has obvious advantages over UASB for high SS influent. Since the IC rising flow rate is very large, SS will not accumulate in large quantities in the reactor, and the sludge can maintain a high activity. The disadvantage of IC is that in the case of treating high-concentration organic wastewater, due to the relatively short hydraulic retention time, the removal rate is very low, which increases the burden of oxygen consumption. In addition, due to the internal circulation of gas, especially for plants with unstable influent water quality, the IC effluent water volume is extremely unstable, and the effluent water quality is also relatively unstable. Sometimes there may be a short period of no water discharge, which has an impact on the subsequent treatment process.

[0006] In summary, the currently commonly used anaerobic systems have uneven water distribution, low mass transfer efficiency, and poor treatment effect on medium and high concentration organic wastewater. Summary of the invention

[0007] In order to solve the above problems, the utility model proposes a multi-effect anaerobic reaction sewage treatment system to achieve good treatment efficiency, stable operation, simple structure, uniform distribution of granular sludge, and high biomass in the sludge bed, which is suitable for the purpose of treating medium and high concentration organic sewage.

[0008] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a sewage treatment system with multiple-effect anaerobic reaction, comprising a reactor (1), a water distribution plate (2), a solid-liquid separator (3), a three-phase separator (4), a water outlet trough (5), a vent pipe (6), a gas collecting chamber (7), a water inlet pipe (8), a circulation pipe (10), a circulation pump (12), a water outlet pipe (13), and an exhaust pipe (14). The reactor (1) is a steel cylinder structure. A water distribution plate (2) is provided at the bottom of the reactor (1), and a solid-liquid separator (3) is provided at the middle of the reactor (1). A solid-liquid separator (3) is provided. A three-phase separator (4) is provided at the upper position of a reactor (1). An arc-shaped gas collecting chamber (7) is provided at the top of the reactor (1). A water inlet pipe (8) is provided at the bottom of the reactor (1). A water inlet valve (9) and a circulation pump (12) are installed on the water inlet pipe (8). A water outlet pipe (13) is provided at the upper part of the reactor (1). An exhaust pipe (14) is provided at the top of the gas collecting chamber (7). A circulation pipe (10) connects the water outlet pipe (13) with the water inlet pipe (8). A circulation pipe valve (11) is provided on the circulation pipe (10).

[0009] The water distribution plate (2) is installed in the reactor (1) at a position 0.5-2m from the bottom. The water distribution plate (2) is composed of a plurality of small tubes that conduct one-way from bottom to top. The water distribution plate (2) covers the entire radial cross section of the reactor (1). The advantage of this is that the water distribution plate (2) is divided into two independent cavities, which can not only prevent the sludge in the upper part from flowing to the bottom of the reactor (1) and causing blockage, but also improve the uniformity of mixing and contact between microorganisms and wastewater after the wastewater passes through the water distribution effect of the water distribution plate (2), promote mass transfer efficiency, and thus improve the sewage treatment effect.

[0010] The solid-liquid separator (3) is a structure in which a plurality of 30°-60° inclined tubes are arranged in parallel and closely in sequence. The vertical height of the solid-liquid separator (3) is 0.5-0.8m, and the cross section of a single inclined tube is a rectangle with a side length of 50mm-100mm. The advantage of this is that the sludge below the solid-liquid separator (3) will gradually expand and rise along with the biogas produced by microorganisms. The inclined structure of the solid-liquid separator (3) can effectively prevent the rising speed of the sludge, and will cause a part of the sludge particles to condense into small pieces and slide down, thereby maintaining the sludge concentration and microbial quantity at the bottom of the reactor (1).

[0011] The three-phase separator (4) is a conical structure, the bottom of the cone is provided with a channel connected to the lower part, 2-4 ventilation pipes (6) are provided above the three-phase separator (4), and a water outlet trough (5) is provided on the outer ring of the three-phase separator (4), and the height of the water outlet trough (5) is 0.2-0.4m higher than the upper part of the three-phase separator (4). The advantages of this are: the conical structure of the three-phase separator (4) can make the sludge that is gathered again slide down to the bottom to prevent the sludge from running, the ventilation pipe (6) can ensure that the generated biogas is discharged smoothly, and the treated supernatant overflows to the water outlet trough (5) and is discharged from the system through the water outlet pipe (13).

[0012] The circulation pipe (10) connects the outlet pipe (13) with the inlet pipe (8). The advantage of this is that the internal circulation of sewage can increase the residence time of sewage in the reactor (1) and the expansion effect of sludge particles, thereby improving the treatment effect of high-concentration organic wastewater and the removal rate of difficult-to-degrade organic matter.

[0013] The beneficial effects of the utility model are as follows: a sewage treatment system with multiple-effect anaerobic reaction utilizes the solid-liquid separator (3) and the three-phase separator (4) to first degas the mixed liquid, and the generated biogas enters the gas collecting chamber (7) and then is discharged from the reactor (1). The degassed mixed liquid sludge is further separated in the conical structure of the three-phase separator (4), and the sludge is returned to the lower reaction zone after sedimentation, and the clarified effluent flows out of the reactor (1). In order to maintain a larger rising flow rate and ensure that the granular sludge bed is fully expanded, the utility model adds an effluent recycling part, so that the liquid rising flow rate inside the reactor (1) is much higher than that of IC, UASB and other reactors, thereby strengthening the contact between sewage and microorganisms and improving the treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural elevation view of the equipment of the present utility model.

[0015] Figure 2 This is the AA cross-sectional view of the equipment structure of the utility model.

[0016] Figure 3 It is a BB cross-sectional view of the equipment structure of the utility model.

[0017] Wherein: (1) reactor, (2) water distribution plate, (3) solid-liquid separator, (4) three-phase separator, (5) water outlet trough, (6) ventilation pipe, (7) gas collecting chamber, (8) water inlet pipe, (9) water inlet valve, (10) circulation pipe, (11) circulation pipe valve, (12) circulation pump, (13) water outlet pipe, (14) exhaust pipe. DETAILED DESCRIPTION

[0018] In order to have a further understanding and recognition of the structural features and the effects achieved by the utility model, a preferred embodiment and accompanying drawings are used to illustrate the invention as follows:

[0019] As shown in FIG. (1), a sewage treatment system with multiple-effect anaerobic reaction comprises a reactor (1), a water distribution plate (2), a solid-liquid separator (3), a three-phase separator (4), a water outlet tank (5), a vent pipe (6), a gas collecting chamber (7), a water inlet pipe (8), a circulation pipe (10), a circulation pump (12), a water outlet pipe (13), and an exhaust pipe (14). The reactor (1) is a steel cylinder structure. A water distribution plate (2) is provided at the bottom of the reactor (1), and a solid-liquid separator is provided at the middle of the reactor (1). (3), a three-phase separator (4) is provided at the upper position of the reactor (1), an arc-shaped gas collecting chamber (7) is provided at the top of the reactor (1), a water inlet pipe (8) is provided at the bottom of the reactor (1), a water inlet valve (9) and a circulation pump (12) are installed on the water inlet pipe (8), a water outlet pipe (13) is provided at the upper part of the reactor (1), an exhaust pipe (14) is provided at the top of the gas collecting chamber (7), a circulation pipe (10) connects the water outlet pipe (13) with the water inlet pipe (8), and a circulation pipe valve (11) is provided on the circulation pipe (10).

[0020] In this embodiment, the water distribution tray (2) is installed in the reactor (1) at a position 1 m away from the bottom. The water distribution tray (2) is composed of many small tubes that conduct water in a one-way manner from bottom to top. The water distribution tray (2) covers the entire radial cross-section of the reactor (1).

[0021] In this embodiment, the solid-liquid separator (3) is a structure in which a plurality of 45° inclined tubes are arranged in parallel and closely in sequence. The vertical height of the solid-liquid separator (3) is 0.5 m, and the cross-section of a single inclined tube is a rectangle with a side length of 70 mm.

[0022] In this embodiment, the three-phase separator (4) is a conical structure, and a channel is provided at the bottom of the cone to communicate with the lower part. Four ventilation pipes (6) are provided above the three-phase separator (4), and a water outlet trough (5) is provided on the outer ring of the three-phase separator (4). The height of the water outlet trough (5) is 0.25m higher than the upper part of the three-phase separator (4).

[0023] In this embodiment, the circulation pipe (10) connects the water outlet pipe (13) with the water inlet pipe (8).

[0024] In this embodiment, the anaerobic conditions required for denitrification can be effectively achieved, and the total nitrogen (nitrate nitrogen) can be removed under the condition that C / N is less than 4, the carbon source can be saved by more than 20%, and the denitrification can still be ensured to proceed smoothly under the condition of very low total nitrogen concentration. The reactor is simple to operate, does not require backwashing, is easy to maintain, and has good promotion and application value.

[0025] Statement content: The above embodiments are only used to illustrate the equipment structure involved in the utility model, rather than to limit the protection scope of the utility model. Although the utility model is described in detail with reference to the preferred embodiments, relevant personnel in the field should understand that it is allowed to modify and adjust the equipment structure of the utility model within a reasonable range without departing from the essence and scope of the technology of the utility model.

Claims

1. A sewage treatment system with multiple-effect anaerobic reaction, characterized in that: The invention comprises a reactor (1), a water distribution plate (2), a solid-liquid separator (3), a three-phase separator (4), a water outlet tank (5), a vent pipe (6), a gas collecting chamber (7), a water inlet pipe (8), a circulation pipe (10), a circulation pump (12), a water outlet pipe (13), and an exhaust pipe (14). The reactor (1) is a steel cylindrical structure. The water distribution plate (2) is arranged at the bottom of the reactor (1), the solid-liquid separator (3) is arranged at the middle of the reactor (1), and the reactor (1) is provided with a plurality of air outlet pipes (14). A three-phase separator (4) is provided at the upper position of the reactor (1); an arc-shaped gas collecting chamber (7) is provided at the top of the reactor (1); a water inlet pipe (8) is provided at the bottom of the reactor (1); a water inlet valve (9) and a circulation pump (12) are installed on the water inlet pipe (8); a water outlet pipe (13) is provided at the upper part of the reactor (1); an exhaust pipe (14) is provided at the top of the gas collecting chamber (7); a circulation pipe (10) connects the water outlet pipe (13) with the water inlet pipe (8); and a circulation pipe valve (11) is provided on the circulation pipe (10).

2. A multi-effect anaerobic reaction sewage treatment system according to claim 1, characterized in that: The water distribution plate (2) is installed in the reactor (1) at a position 0.5-2 m from the bottom. The water distribution plate (2) is composed of a plurality of small pipes that conduct one-way from bottom to top. The water distribution plate (2) covers the entire radial cross section of the reactor (1).

3. A multi-effect anaerobic reaction sewage treatment system according to claim 1, characterized in that: The solid-liquid separator (3) is a structure in which a plurality of 30°-60° inclined tubes are parallel and closely arranged in sequence. The vertical height of the solid-liquid separator (3) is 0.5-0.8 m, and the cross-section of a single inclined tube is a rectangle with a side length of 50 mm-100 mm.

4. A multi-effect anaerobic reaction sewage treatment system according to claim 1, characterized in that: The three-phase separator (4) is a conical structure, the bottom of the cone is provided with a channel connected to the lower part, 2-4 ventilation pipes (6) are provided above the three-phase separator (4), and a water outlet trough (5) is provided on the outer ring of the three-phase separator (4), and the height of the water outlet trough (5) is 0.2-0.4m higher than the upper part of the three-phase separator (4).

5. The multi-effect anaerobic reaction sewage treatment system according to claim 1, characterized in that: The circulation pipe (10) connects the water outlet pipe (13) with the water inlet pipe (8).

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