Integrated sewage treatment equipment

Abstract

The utility model relates to integrated sewage treatment equipment which comprises a tank body, the device comprises an anoxic tank I, an aerobic tank, an anoxic tank II and a membrane tank, a submersible reflux pump II is arranged at the bottom of the membrane tank, the outlet end of a reflux pipe II extends to the bottom of the aerobic tank, and the inlet end of the reflux pipe II is connected with the outlet end of the submersible reflux pump II through a pipeline; the secondary sedimentation tank is arranged behind the membrane tank; the equipment room is arranged behind the secondary sedimentation tank and is configured to add chemicals into the secondary sedimentation tank; water flow lifted into the anoxic tank I through a submersible reflux pump I in the anoxic tank II is hydraulically mixed in the anoxic tanks, so that dissolved oxygen in the anoxic tank I and the anoxic tank II can be less than 0.5 mg / L, nitrogen removal by denitrification is facilitated, and the equipment has an excellent total nitrogen removal effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field, concretely is integrated sewage treatment equipment. BACKGROUND

[0002] In recent years, with the efforts of local water environment governance, the overall water environment status is improving year by year, and the compliance rate of each test section is increasing year by year. Whether it is municipal sewage treatment, industrial park wastewater treatment, or rural domestic sewage treatment, excellent results have been achieved. Although the water environment has been greatly improved, the water environment compliance results are relatively fragile, and the pressure of water environment protection is still great. From the current situation, municipal sewage treatment plants and industrial park sewage treatment plants are running well, with high takeover rate and high treatment rate, but there are still cases of domestic sewage not being connected and lacking sewage treatment facilities in rural areas. Some irrigation ditches are affected by farmland runoff, and the water quality is poor, which will lead to non-compliance of the test section in a single month. Therefore, in order to further improve the water environment quality of each place, it is necessary to add certain facilities for collecting and treating the domestic sewage in villages with imperfect pipe networks. There are many forms of domestic sewage treatment facilities in villages in recent years, including integrated equipment, buried tanks, oxidation ponds, etc. Among them, integrated equipment is divided into two types with and without MBR membrane. In general, the integrated equipment with MBR membrane has the best effect on the treatment of rural domestic sewage among these facilities.

[0003] However, the existing MBR integrated equipment still has some problems in the process, such as: the degradation effect of COD, ammonia nitrogen and TP is good, but the degradation effect of TN is poor, the main reason is that the DO is not controlled well, mainly the aeration stirring in the anoxic tank, and the anoxic tank volume is too small.

[0004] Therefore, it is necessary to improve the current sewage treatment equipment to meet the water treatment demand. INVENTION CONTENTS

[0005] The utility model solves the technical problem in the prior art, provides a sewage treatment equipment which can flexibly increase the anoxic tank volume according to the demand of water quality, prolong the hydraulic retention time (HRT) of the anoxic tank, change the form of aeration stirring, and ensure that the dissolved oxygen in the anoxic tank is at a low level.

[0006] The technical problem solved by the utility model is solved by the following technical scheme, an integrated sewage treatment equipment, comprising a tank body, the tank body has;

[0007] An anoxic tank I has a sewage inlet pipe for water inlet, and the sewage inlet pipe extends to the bottom of the anoxic tank I;

[0008] An aerobic tank is arranged at the rear of the anoxic tank I, and has a water inlet pipe I, the inlet end of which is connected to the top of the anoxic tank I, and the outlet end of which extends to the bottom of the aerobic tank;

[0009] An anoxic tank II is arranged at the rear of the aerobic tank, and has a water inlet pipe II, the inlet end of which is connected to the top of the aerobic tank, and the outlet end of which extends to the bottom of the anoxic tank II, a submersible agitator is arranged at the bottom of the anoxic tank II, a reflux pipe I is arranged at the top of the tank body, a submersible reflux pump I is arranged at the bottom of the anoxic tank II, the outlet end of the reflux pipe I extends to the bottom of the anoxic tank I, and the inlet end of the reflux pipe I is connected to the outlet end of the submersible reflux pump I through a pipeline;

[0010] A membrane tank is arranged at the rear of the anoxic tank II, and has a water inlet pipe III, the inlet end of which is connected to the top of the anoxic tank II, and the outlet end of which extends to the bottom of the membrane tank, a reflux pipe II is arranged at the top of the tank body, a submersible reflux pump II is arranged at the bottom of the membrane tank, the outlet end of the reflux pipe II extends to the bottom of the aerobic tank, and the inlet end of the reflux pipe II is connected to the outlet end of the submersible reflux pump II through a pipeline;

[0011] A secondary sedimentation tank is arranged at the rear of the membrane tank;

[0012] A device room is arranged at the rear of the secondary sedimentation tank, and comprises a PAC dosing tank, a carbon source dosing tank and a self-priming pump, the inlet end of the self-priming pump is connected to the bottom of the membrane tank through a pipeline, the outlet end of the self-priming pump is connected with a water inlet pipe IV, the outlet end of the water inlet pipe IV is connected to the middle of the secondary sedimentation tank, the outlet end of the PAC dosing tank is connected to the outlet end of the self-priming pump through a pipeline, and the outlet end of the carbon source dosing tank is connected to the anoxic tank I through a pipeline.

[0013] The technical problems solved by the utility model can also be solved by the following technical solutions.

[0014] The technical problems solved by the utility model can also be solved by the following technical solutions.

[0015] Compared with the prior art, the utility model has the advantages of:

[0016] (1) the water flow in the anoxic tank II is lifted to the anoxic tank I by the submersible reflux pump I in the anoxic tank II, and the water is mixed in the anoxic tank, so that the dissolved oxygen in the anoxic tank I and the anoxic tank II is less than 0.5 mg / L, which is beneficial to denitrification, thereby the device has excellent total nitrogen removal effect;

[0017] (2) according to the water quality situation, through the start and stop of the submersible mixer in the anoxic tank II, different operation processes can be flexibly adjusted, the effluent can meet the standard, the MBR membrane in the membrane tank can be protected to the maximum extent, the service life of the MBR membrane is prolonged, and the operation and maintenance cost of cleaning the MBR membrane is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a front view structural schematic diagram of the utility model.

[0019] The drawings are as follows: 1, tank body; 2, anoxic tank I; 3, sewage inlet pipe; 4, aerobic tank; 5, inlet pipe I; 6, anoxic tank II; 7, inlet pipe II; 8, submersible mixer; 9, return pipe I; 10, submersible return pump I; 11, membrane tank; 12, inlet pipe III; 13, return pipe II; 14, submersible return pump II; 15, secondary sedimentation tank; 16, inlet pipe IV; 17, equipment room; 18, PAC dosing tank; 19, self-priming pump; 20, fan; 21, carbon source dosing tank. DETAILED DESCRIPTION

[0020] The specific technical scheme of the utility model is further described below with reference to the drawings, so that those skilled in the art can further understand the utility model, but it does not limit the rights thereof.

[0021] Example 1, refer to Figure 1 The integrated sewage treatment equipment comprises a tank body 1, the tank body 1 can be a square tank body 1, the size and depth of the tank body 1 can be selected according to the use requirement, and the tank body 1 has;

[0022] An anoxic tank I 2 has a sewage inlet pipe 3 for water inlet, and the sewage inlet pipe 3 extends to the bottom of the anoxic tank I 2;

[0023] An aerobic tank 4 is arranged at the rear of the anoxic tank I 2, has an inlet pipe I 5, the inlet end of the inlet pipe I 5 is connected to the top of the anoxic tank I 2, the outlet end of the inlet pipe I 5 extends to the bottom of the aerobic tank 4, and the bottom of the aerobic tank 4 is provided with an aeration pipe 5, and the inlet end of the aeration pipe 5 is connected to the fan 20 described below, which is designed for aeration in the aerobic tank 4;

[0024] Anoxic tank II6 is located downstream of aerobic tank 4. It has an inlet pipe II7, the inlet of which is connected to the top of aerobic tank 4, and the outlet of which extends to the bottom of anoxic tank II6. A submersible mixer 8 is installed between the outlet of inlet pipe II7 and the bottom of anoxic tank II6. Submersible mixer 8 is existing technology, and its specifications and models can be selected according to usage requirements. A return pipe I9 is ​​installed at the top of tank 1, and a submersible return pump I10 is installed at the bottom of anoxic tank II6. The outlet of return pipe I9 extends to the bottom of anoxic tank I2. During the return flow, the return pipe I9 forms hydraulic agitation at the bottom of anoxic tank I2. The inlet of return pipe I9 is ​​connected to the outlet of submersible return pump I10 through a pipe. Submersible return pump I10 is existing technology, and its specifications and models can be selected according to usage requirements.

[0025] Membrane tank 11 is located downstream of anoxic tank II 6. It has an inlet pipe III 12, the inlet end of which is connected to the top of anoxic tank II 6, and the outlet end of which extends to the bottom of membrane tank 11. A return pipe II 13 is installed at the top of tank 1, and a submersible return pump II 14 is installed at the bottom of membrane tank 11. Submersible return pump II 14 is existing technology, and its specifications and models can be selected according to usage requirements. The outlet end of return pipe II 13 extends to the bottom of aerobic tank 4, and the inlet end of return pipe II 13 is connected to the outlet end of submersible return pump II 14 through a pipe.

[0026] Secondary sedimentation tank 15 is located downstream of membrane tank 11;

[0027] Equipment room 17, located downstream of secondary sedimentation tank 15, includes a PAC dosing tank 18, a carbon source dosing tank 21, and a self-priming pump 19. The inlet of the self-priming pump 19 is connected to the bottom of membrane tank 11 via a pipe, and the outlet of the self-priming pump 19 is connected to an inlet pipe IV 16. The outlet of the inlet pipe IV 16 is connected to the middle of secondary sedimentation tank 15. The outlet of the PAC dosing tank 18 is connected to the outlet of the self-priming pump 19 via a pipe, and the outlet of the carbon source dosing tank 21 is connected to the anoxic tank I 2 via a pipe.

[0028] The wastewater treatment equipment described in Example 1 has two specific treatment methods:

[0029] 1. The AOA+MBR+coagulation sedimentation process (under low load conditions) has the following treatment flow:

[0030] (1) No aeration is carried out in the anoxic tank I2, and an anoxic environment is formed in the tank, which fully consumes the dissolved oxygen in the influent;

[0031] (2) The aerobic tank 4 is aerated by the blower 20 built into the equipment room 17, which is linked to the aeration pipe 5 in the aerobic tank 4 to fill the water with oxygen and aerate it.

[0032] (3) The submersible mixer 8 in the anoxic tank II 6 stops. The mud-water mixture from the aerobic tank 4 is separated here. At the same time, the denitrification reaction is carried out in the anoxic environment. The submersible return pump I 10 pumps the settled sludge back to the anoxic tank I 2, and further utilizes the carbon source in the incoming water for denitrification, thereby improving the overall denitrification efficiency of the equipment.

[0033] (4) Membrane tank 11: The supernatant of anoxic tank II 6 enters membrane tank 11 and is filtered by MBR (membrane bioreactor) membrane and discharged. Because the MBR (membrane bioreactor) membrane filters the supernatant, which contains little mud, it can effectively ensure the membrane flux of MBR and reduce the frequency of membrane clogging. Aeration pipes can be installed in membrane tank 11 to air-scrub the membrane surface and oxygenate the sewage at the same time. At this time, membrane tank 11 is equivalent to the second aerobic tank 4. Submersible return pump II 14 pumps oxygen-rich water to aerobic tank 4 for further degradation.

[0034] (5) During the secondary sedimentation tank 15 treatment stage, the effluent from the membrane tank 11 that meets the TP (total phosphorus) standard is discharged after passing through the secondary sedimentation tank 15. When the TP (total phosphorus) does not meet the standard, the effluent from the membrane tank 11 is sent to the self-priming pump 19 built into the equipment room 17. At the outlet pipe of the self-priming pump 19, the phosphorus removal agent (PAC, etc.) in the PAC dosing tank in the equipment room 17 is added to the outlet end of the self-priming pump 19 through the pipeline mixer. Then, it enters the middle part of the secondary sedimentation tank 15 through the inlet pipe IV 16 for sedimentation. The supernatant after sedimentation is discharged, and the sludge is discharged periodically.

[0035] 2. The process flow of AO (anoxic tank I 2) + AO (anoxic tank II 6) + MBR (membrane tank 11) + coagulation sedimentation (secondary sedimentation tank 15) (under high load conditions) is as follows:

[0036] (1) No aeration is carried out in the anoxic tank I2, and an anoxic environment is formed in the tank, which fully consumes the dissolved oxygen in the influent;

[0037] (2) The aerobic tank 4 is aerated by the blower 20 built into the equipment room 17, which is linked to the aeration pipe 5 in the aerobic tank 4 to fill the water with oxygen and aerate it.

[0038] (3) The submersible mixer 8 in the anoxic tank II 6 is turned on. The mud-water mixture from the aerobic tank 4 undergoes denitrification in this anoxic environment. The submersible return pump I 10 pumps the settled sludge back to the anoxic tank I 2, and further utilizes the carbon source in the incoming water for denitrification, thereby improving the overall denitrification efficiency of the equipment.

[0039] (4) Membrane pool 11, the sludge and water mixture of anoxic pool II 6 into the membrane pool 11, through the MBR (membrane bioreactor) membrane filtration effluent, membrane pool 11 can be equipped with aeration pipe, to the membrane surface air scrubbing, at the same time, the sewage is oxygenated, at this time, the membrane pool 11 is equivalent to the second aerobic tank 4, the submersible reflux pump II 14 will be oxygen-rich water extracted to the aerobic tank 4 for further degradation;

[0040] (5) Two sedimentation tank 15 treatment stage, TP (total phosphorus) membrane pool 11 effluent through the two sedimentation tank 15 after the discharge, when TP (total phosphorus) does not meet the standard, the membrane pool 11 effluent to the equipment room 17 built-in self-priming pump 19, and in the self-priming pump 19 effluent pipe at the pipe mixer with equipment room 17 PAC dosing box in the phosphorus removal agent (PAC, etc.) synergistic metering pump added to the outlet end of the self-priming pump 19, then through the water pipe IV 16 into the middle of the two sedimentation tank 15 for sedimentation, the supernatant after sedimentation is discharged, the sludge is regularly discharged.

[0041] The comparison of the above two processes:

[0042] When the influent TN (total nitrogen) is not high, the specific value can be selected according to the target water quality standard of each water treatment, so this place does not repeat the specific value, the nitrogen removal requirement is low, the first process can be used to run, the standard is met at the same time, the high flux of MBR membrane is maintained, the number of membrane washing is reduced;

[0043] When the influent TN (total nitrogen) is high, the specific value can be selected according to the target water quality standard of each water treatment, the second process can be used to run, so that the sludge experiences two dissolved oxygen gradient changes, due to the reflux of A\O pool, the mutual interference of DO is reduced, and the nitrogen removal efficiency is ensured.

[0044] When the influent carbon source is insufficient, the carbon source dosing box 21 in the equipment room 17 can be used to add carbon source to the anoxic pool I 2, to further ensure the nitrogen removal efficiency.

Claims

1. An integrated wastewater treatment plant, characterized by: The pool body has; An anoxic pool I has a sewage inlet pipe for water inlet, and the sewage inlet pipe extends to the pool bottom of the anoxic pool I; An aerobic pool is arranged in the rear process of the anoxic pool I, and has a water inlet pipe I, the inlet end of the water inlet pipe I is connected to the top of the anoxic pool I, and the outlet end of the water inlet pipe I extends to the pool bottom of the aerobic pool; An anoxic pool II is arranged in the rear process of the aerobic pool, and has a water inlet pipe II, the inlet end of the water inlet pipe II is connected to the top of the aerobic pool, and the outlet end of the water inlet pipe II extends to the pool bottom of the anoxic pool II, a reflux pipe I is arranged on the top of the pool body of the anoxic pool II, a submersible reflux pump I is arranged on the bottom of the anoxic pool II, the outlet end of the reflux pipe I extends to the pool bottom of the anoxic pool I, and the inlet end of the reflux pipe I is connected to the outlet end of the submersible reflux pump I through a pipeline; A membrane pool is arranged in the rear process of the anoxic pool II, and has a water inlet pipe III, the inlet end of the water inlet pipe III is connected to the top of the anoxic pool II, and the outlet end of the water inlet pipe III extends to the pool bottom of the membrane pool, a reflux pipe II is arranged on the top of the pool body, a submersible reflux pump II is arranged on the pool bottom of the membrane pool, the outlet end of the reflux pipe II extends to the pool bottom of the aerobic pool, and the inlet end of the reflux pipe II is connected to the outlet end of the submersible reflux pump II through a pipeline; A secondary sedimentation tank is arranged in the rear process of the membrane pool; A device room is arranged in the rear process of the secondary sedimentation tank, and includes a PAC dosing tank, a carbon source dosing tank and a self-priming pump, the inlet end of the self-priming pump is connected to the bottom of the membrane pool through a pipeline, the outlet end of the self-priming pump is connected with a water inlet pipe IV, the outlet end of the water inlet pipe IV is connected to the middle part of the secondary sedimentation tank, the outlet end of the PAC dosing tank is connected to the outlet end of the self-priming pump through a pipeline, and the outlet end of the carbon source dosing tank is connected to the anoxic pool I through a pipeline.

2. The integrated wastewater treatment apparatus according to claim 1, characterized by: A submersible agitator is arranged on the pool bottom of the anoxic pool II.

3. The integrated wastewater treatment apparatus according to claim 1, characterized by: The pool bottom of the aerobic pool is provided with an aeration pipe, and a fan for supplying air to the aeration pipe is arranged in the device room.

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