CN210683344U - a sewage treatment system - Google Patents

Abstract

The utility model discloses a sewage treatment system, which comprises an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank which are sequentially connected and arranged on the same horizontal plane. The oxygen tank and the anoxic tank are connected at the bottom through the water outlet pipe, the anoxic tank and the aerobic tank are connected at the upper part through the water outlet pipe, and the aerobic tank and the sedimentation tank are connected at the upper and bottom through the water outlet pipe and the sludge discharge pipe respectively; the sedimentation tank includes The sludge sedimentation tank and the clear water tank are provided with a first sludge return pipe, and the anaerobic sludge tank is provided with a second sludge return pipe for returning sludge to the anaerobic tank. The first sludge return pipe and The second sludge return pipes are all connected with a sludge pump; the aerobic tank is provided with a digestion liquid stripping device, one end of the digestion liquid stripping device is connected to the aeration device, and the other end is connected to the anaerobic tank through a pipeline. The technical scheme of the utility model aims to provide a sewage treatment system which can effectively reduce the sludge output and improve the phosphorus removal effect.

Description

a sewage treatment system

technical field

The utility model relates to the technical field of sewage treatment equipment, in particular to a sewage treatment system.

Background technique

With the growth of the world's population base and the rapid development of industry in recent years, the amount of sewage discharge is increasing, and the pollution of water resources is becoming more and more serious. The amount of sludge generated in the process of sewage treatment has also increased simultaneously, and the situation of sludge treatment is severe. As an important component of sewage, sludge contains a large amount of harmful substances such as bacteria, viruses, heavy metals, and bio-refractory organic matter. Untreated sludge can easily cause secondary pollution to the environment and slow down the pace of building a green and environmentally friendly economy. Water pollution has become a thorny problem faced by countries all over the world, and sewage treatment is imminent.

The existing domestic sewage treatment equipment includes ozone oxidation method, electrochemical method, ultrasonic soundification method, activated sludge method, multi-stage AO process, etc. to remove nitrogen and phosphorus pollutants in domestic sewage. Ozone oxidation method, electrochemical method and ultrasonic sonication method have large investment, high power consumption, high operating cost and low efficiency; multi-stage AO process leads to large sludge return in the sewage treatment process, complex process, energy consumption, And the operation is complicated, the cost is high, and a large amount of sludge is produced. And because there is a large amount of nitrate in the sludge returned to the anaerobic section, the anaerobic environment of the anaerobic section is destroyed, which is not conducive to the phosphorus release effect of the anaerobic section; the sludge return flow is large, and the operating energy consumption is large; The carbon source in the anoxic section is easy to be insufficient, which affects the denitrification treatment effect.

Therefore, it is necessary to propose a new sewage treatment system.

Utility model content

The main purpose of the utility model is to propose a sewage treatment system which can effectively reduce the sludge output and improve the phosphorus removal effect.

In order to achieve the above purpose, a sewage treatment system proposed by the present utility model includes an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank which are sequentially connected and arranged on the same horizontal plane, and also includes: an anaerobic sludge tank, the The anaerobic tank and the anoxic tank are communicated at the bottom through the outlet pipe, the anoxic tank and the aerobic tank are communicated at the top through the outlet pipe, and the aerobic tank and the sedimentation tank are respectively through the outlet pipe and the aerobic tank. The sludge discharge pipe is connected at the upper part and the bottom; the sedimentation tank includes a sludge sedimentation tank and a clear water tank, the sludge sedimentation tank is communicated with the upper part of the clear water tank, the clear water tank is communicated with an external drainage pipe, and the sludge sedimentation tank is provided with There is a first sludge return pipe for returning sludge to the anaerobic sludge tank, and the anaerobic sludge tank is provided with a second sludge return pipe for returning sludge to the anaerobic sludge tank, Both the first sludge return pipe and the second sludge return pipe are connected with a sludge pump; the aerobic tank is provided with a digestion liquid gas stripping device for returning the digestion liquid gas to the anaerobic tank, One end of the digestion liquid stripping device is connected to the aeration device, and the other end is connected to the anaerobic tank through a pipeline.

Preferably, an aerator is also provided at the bottom of the aerobic tank, and the aerator is connected to the aeration device.

Preferably, mobile biological fillers are also arranged in the aerobic tank.

Preferably, a perforated tube aeration device is provided in the anoxic tank, and the perforated tube aeration device is connected to the aeration device.

Preferably, the anoxic tank is further provided with fixed biological fillers.

Compared with the prior art, the beneficial effects of the present utility model are:

1. The equipment is simple in structure, convenient in installation, excellent in treatment effect, and effectively reduces the subsequent process load.

2. An anaerobic sludge tank is added to the sludge return section after the sedimentation tank to construct an anaerobic/aerobic alternating environment for microorganisms. The microorganisms in the sludge cannot carry out normal metabolic activities, which can effectively reduce the sludge production. .

3. After the sedimentation tank, the device is equipped with a sludge anaerobic tank, and the return measures are added to prolong the anaerobic residence time of the sludge, so that the phosphorus accumulating bacteria (PAOs) can release phosphorus more fully, and greatly improve phosphorus removal. The effect is that in the sludge anaerobic tank, a certain proportion of phosphorus-accumulating bacteria can release phosphorus first, which has a significant impact on the phosphorus-accumulating bacteria in the aerobic zone, and can better absorb phosphorus. In addition, there is no need to add additional chemicals during operation, which can effectively save the cost of sewage treatment.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are just some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained based on the structures shown in these drawings without any creative effort.

Fig. 1 is the structural representation of the utility model;

The realization, functional characteristics and advantages of the purpose of the present utility model will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Detailed ways

A sewage treatment system proposed in this embodiment, as shown in FIG. 1 , includes an anaerobic tank 100 , an anoxic tank 200 , an aerobic tank 300 and a sedimentation tank 400 that are connected to the same horizontal plane in sequence, and further includes: an anaerobic tank The sludge tank 500, the anaerobic tank 100 and the anoxic tank 200 are connected at the bottom through the outlet pipe, the anoxic tank 200 and the aerobic tank 300 are connected at the upper part through the outlet pipe, and the aerobic tank 300 and the sedimentation tank 400 are respectively connected through the outlet pipe and the aerobic tank 300. The sludge discharge pipe is communicated with the upper part and the bottom; the sedimentation tank 400 includes a sedimentation tank 410 and a clear water tank 420, the upper part of the sludge sedimentation tank 410 and the clear water tank 420 are communicated, the clear water tank 420 is communicated with the external drainage pipe, and the sludge sedimentation tank 410 is provided with a The sludge is returned to the first sludge return pipe 411 of the anaerobic sludge tank 500, and the other end of the first sludge return pipe 411 is communicated with the anaerobic sludge tank 500; the anaerobic sludge tank 500 is provided with a sludge return pipe The second sludge return pipe 510 to the anaerobic tank 100, the other end of the second sludge return pipe 510 is communicated with the anaerobic tank 100; the first sludge return pipe 411 and the second sludge return pipe are both connected with sewage. Mud pump; the aerobic tank 300 is provided with a digestion liquid gas stripping device 600 for returning the digestive liquid gas to the anaerobic tank 100. One end of the digestion liquid gas stripping device 600 is connected to the aeration device 700, and the other end is connected to the anaerobic equipment through a pipeline. Pool 100.

The technical solution of the utility model is to add an anaerobic sludge tank 500 in the sludge return section after the sedimentation tank 400, so as to construct an anaerobic/aerobic alternating environment for the microorganisms. Effectively reduce the sludge production; and after the sedimentation tank 400, add a sludge anaerobic tank 100, and increase the return measures to prolong the anaerobic residence time of the sludge, so that the phosphorus accumulating bacteria (PAOs) can more fully release phosphorus, The phosphorus removal effect is greatly improved. In the sludge anaerobic tank 100, a certain proportion of phosphorus accumulating bacteria can release phosphorus first, which has a significant impact on the phosphorus accumulating bacteria in the aerobic zone, and can better absorb phosphorus. In addition, there is no need to add additional chemicals during operation, which can effectively save the cost of sewage treatment. The technical scheme of the utility model also has the characteristics of simple structure, convenient installation, excellent treatment effect, and effective reduction of subsequent process load.

Further, in the embodiment of the present invention, an aerator 310 is also provided at the bottom of the aerobic tank 300 , and the aerator 310 is connected to the aeration device 700 .

Further, in the embodiment of the present invention, the aerobic tank 300 is further provided with a mobile biological filler 320 .

Further, in the embodiment of the present invention, the anoxic tank 200 is provided with a perforated tube aeration device 210 , and the perforated tube aeration device 210 is connected to the aeration device 700 .

Further, in the embodiment of the present invention, the anoxic tank 200 is further provided with a fixed biological filler 220 .

The sewage treatment system in the present invention is mainly composed of an anaerobic tank 100 , an anoxic tank 200 , an aerobic tank 300 , a sedimentation tank 400 and a sludge anaerobic tank 100 . The sewage is lifted into the equipment by the water pump, and passes through the anaerobic tank 100, the anoxic tank 200, the aerobic tank 300, the sedimentation tank 400, and the sludge anaerobic tank 100 to achieve biochemical degradation and precipitation separation of sewage, of which the aerobic tank 300 is installed. Digestive liquid stripping device 600, the mixed liquid is returned to the anoxic tank 200, and the first sludge return pipe 411 is installed in the sedimentation tank 400, and the sludge is returned to the sludge anaerobic tank 100 through the first sludge return pipe 411, and then from the sludge The sludge anaerobic tank 100 is returned to the anaerobic tank 100 through the second sludge return pipe. The effluent in the anaerobic tank 100 enters the anoxic tank 200 through the bottom outlet pipe, and then flows into the aerobic tank 300 through the upper outlet pipe of the anoxic tank 200, and the nitrification reaction is completed in the aerobic tank 300. In the aerobic stage, a large amount of ATP is generated and stored in the cell for anabolism, and the organic matter is degraded again. A part of the effluent from the aerobic tank 300 directly enters the sedimentation tank 400 for mud-water separation, and the supernatant is directly discharged. A part of the effluent from the aerobic tank 300 is also returned to the anaerobic tank 100 to continue the system circulation. When the sewage flows out, after flowing out from the anoxic tank 200, it enters the aerobic tank 300 for treatment. The effluent flows out in two parts, and a part returns to the anoxic tank 200, the supernatant enters the sedimentation tank 400, and the sludge enters the sedimentation tank 400 from the bottom sludge discharge pipe, thereby realizing the separation of mud and water. The returning sludge is stopped by the sludge anaerobic tank 100 and then returned to the anaerobic tank 100 . Because the sludge is returned from the sludge anaerobic tank 100 into the anaerobic tank 100, it is equivalent to two phosphorus release reactions. After the nitrifying liquid enters the anoxic tank 200, the activated sludge in the anoxic tank 200 uses the organic matter in the influent to denitrify the nitrate nitrogen into nitrogen and release it into the air, so as to achieve the purpose of removing nitrogen, the anoxic tank 200 The built-in perforated pipe is equipped with intermittent aeration to ensure an oxygen-deficient environment.

The sewage treatment system of the present utility model controls the operation of the sludge pump and the aeration device 700 through the controller, and also controls the first sludge return pipe 411, the second sludge return pipe, the aerator 310 and the perforated pipe aeration device 210. valve to control its operation. An aerator 310 and a control valve are installed at the bottom of the anoxic tank 200, which can adjust the concentration of dissolved oxygen according to needs, and a fixed biological filler 220 is set for the growth and reproduction of microorganisms; the aerobic tank 300 is installed with an air-stripping nitrification liquid return device, one end is connected to the The anoxic tank 200 is connected, the other end is connected to the aeration device 700, and a mobile biological filler 320 is provided; the sludge settled in the sedimentation tank 400 is returned to the sludge anaerobic tank 100 through the sludge pump, and the sludge is discharged from the aerobic environment. directly into an anaerobic environment. The sedimentation tank 400 is divided into two compartments, the first compartment is the sedimentation tank 410 to collect the effluent of the aerobic tank 300, and realizes the separation of mud and water, the first sludge return pipe 411 is arranged in the sedimentation tank 410; the second compartment is the clear water tank 420 is used to collect the supernatant of the first grid sedimentation tank 400, realize the separation of mud and water, and discharge it directly.

The above are only the preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model patent. Any equivalent structure or equivalent process transformation made by using the contents of the present utility model description and accompanying drawings, or directly or indirectly applied to other related The technical field of the present invention is similarly included in the scope of patent protection of the present invention.

Claims (5)

1. The utility model provides a sewage treatment system, includes that intercommunication sets up anaerobism pond, oxygen deficiency pond, good oxygen pond and the sedimentation tank on same horizontal plane in proper order, its characterized in that still includes: the anaerobic sludge tank is communicated with the anoxic tank at the bottom through a water outlet pipe, the anoxic tank is communicated with the aerobic tank at the upper part through a water outlet pipe, and the aerobic tank is communicated with the sedimentation tank at the upper part and the bottom through a water outlet pipe and a sludge discharge pipe respectively; the sedimentation tank comprises a sludge sedimentation tank and a clean water tank, the sludge sedimentation tank is communicated with the upper part of the clean water tank, the clean water tank is communicated with an external drain pipe, a first sludge return pipe for returning sludge to the anaerobic sludge tank is arranged in the sludge sedimentation tank, the anaerobic sludge tank is provided with a second sludge return pipe for returning sludge to the anaerobic tank, and the first sludge return pipe and the second sludge return pipe are both connected with a sludge pump; and a digestive juice gas stripping device for refluxing the digestive juice gas to the anaerobic tank is arranged in the aerobic tank, one end of the digestive juice gas stripping device is connected with an aeration device, and the other end of the digestive juice gas stripping device is communicated with the anaerobic tank through a pipeline.

2. The sewage treatment system of claim 1, wherein the bottom of the aerobic tank is further provided with an aerator, and the aerator is connected with the aeration device.

3. The wastewater treatment system of claim 2, wherein the aerobic tank is further provided with a mobile biological filler.

4. The wastewater treatment system according to claim 3, wherein a perforated pipe aeration device is provided in the anoxic tank, and the perforated pipe aeration device is connected to the aeration apparatus.

5. The wastewater treatment system according to any of claims 1 to 4, wherein a fixed biological filler is further provided in the anoxic tank.

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