阅读说明：本技术 一种电辅助污水处理系统 (Electricity-assisted sewage treatment system ) 是由 江映萱 江明辉 彭睦财 于 2021-09-14 设计创作，主要内容包括：本发明提供了一种电辅助污水处理系统,涉及污水处理技术领域,所述电辅助污水处理系统包括依次连接的污水池、格栅池、沉砂池、AAO生物处理系统和二沉池；二沉池用于对污水进行沉降；二沉池连接有排水管路,排水管路用于排出二沉池沉降分离后的净水；二沉池连接有污泥回流管路；污泥回流管路连接污泥活化器；二沉池沉降分离的部分污泥通过污泥回流管路回流至污泥活化器。本发明的电辅助污水处理系统可以通过弱直流电辅助增加回流污泥中的微生物数量和活性,实现微生物的在线增殖和活化；确保微生物对污水中有机物的降解能力；可以提高AAO生物处理系统的处理效率。(The invention provides an electric auxiliary sewage treatment system, which relates to the technical field of sewage treatment, and comprises a sewage tank, a grid tank, a grit chamber, an AAO biological treatment system and a secondary sedimentation tank which are sequentially connected; the secondary sedimentation tank is used for settling the sewage; the secondary sedimentation tank is connected with a drainage pipeline, and the drainage pipeline is used for discharging the purified water subjected to sedimentation separation in the secondary sedimentation tank; the secondary sedimentation tank is connected with a sludge return pipeline; the sludge return pipeline is connected with the sludge activator; and part of the sludge settled and separated in the secondary sedimentation tank flows back to the sludge activator through a sludge return pipeline. The electrically-assisted sewage treatment system can increase the number and activity of microorganisms in the returned sludge by the assistance of weak direct current, so as to realize the online proliferation and activation of the microorganisms; the degradation capability of microorganisms on organic matters in the sewage is ensured; the treatment efficiency of the AAO biological treatment system can be improved.)

1. An electric auxiliary sewage treatment system is characterized by comprising a sewage tank, a grid tank, a grit chamber, an AAO biological treatment system and a secondary sedimentation tank which are sequentially connected; the secondary sedimentation tank is used for settling the sewage; the secondary sedimentation tank is connected with a drainage pipeline, and the drainage pipeline is used for discharging the purified water subjected to sedimentation separation in the secondary sedimentation tank; the secondary sedimentation tank is connected with a sludge return pipeline; the sludge return pipeline is connected with the sludge activator; part of sludge settled and separated in the secondary sedimentation tank flows back to the sludge activator through a sludge return pipeline; the sludge activator is connected with a nutrient solution supply device and a micro-nano aerator; the sludge activator is also connected with a low-voltage direct-current power supply system; the low-voltage direct-current power supply system comprises an alternating-current power supply, a rectifier transformer, a positive electrode and a negative electrode; the positive electrode and the negative electrode are arranged inside the sludge activator; the alternating current power supply, the rectifier transformer, the positive electrode and the negative electrode form a closed circuit; the sludge activator is connected with the AAO biological treatment system through a pipeline.

2. The electrically assisted sewage treatment system of claim 1 further comprising a sludge storage tank; the sludge storage tank is connected with the secondary sedimentation tank; the sludge storage tank is used for storing residual sludge settled and separated in the secondary sedimentation tank; the mud storage pool is connected with a desliming machine room; the desliming machine room is connected with the water inlet of the grid pool through a filtrate return pipeline.

3. The electrically-assisted sewage treatment system of claim 2, wherein the AAO biological treatment system comprises an anaerobic tank, an anoxic tank and an aerobic tank which are connected in sequence, and the sludge activator is respectively connected with the anaerobic tank, the anoxic tank and the aerobic tank through pipelines; aeration devices are arranged in the anoxic tank and the aerobic tank; the aeration device comprises a microporous aerator arranged at the bottom of the anoxic tank or the aerobic tank.

4. The electrically assisted wastewater treatment system of claim 3, wherein the low voltage DC power supply system further comprises an electromagnetic relay.

5. The electrically assisted sewage treatment system of claim 4 wherein the nutrient solution feeder is comprised of a nutrient solution tank, a delivery pipe and a solenoid valve.

6. The electrically assisted wastewater treatment system of claim 5, wherein the positive and negative electrodes are graphite electrodes or stainless steel electrodes.

Technical Field

The invention relates to the technical field of sewage treatment, in particular to an electric auxiliary sewage treatment system.

Background

In the sewage treatment process, a biological activated sludge method is adopted for treating organic sewage. The AAO process is a typical denitrification and dephosphorization process and mainly comprises an anaerobic section, an anoxic section and an aerobic section; the anaerobic area, the anoxic area and the aerobic area are beneficial to the reproduction and production of different microbial colonies, so the nitrogen and phosphorus removal effect is good.

Maintaining the amount of active microorganisms and the activity of the microorganisms are key factors for ensuring the efficiency of sewage treatment. The active microorganism is usually added into the sewage treatment system in the state of active sludge and naturally proliferated in the sewage treatment system; in the AAO treatment process, part of phosphorus-containing return sludge in the secondary sedimentation tank needs to return to an anaerobic section; the phosphorus-containing return sludge contains a large amount of microorganisms, and the improvement of the number and the activity of the microorganisms has great significance for the improvement of the treatment efficiency of a sewage treatment system.

Disclosure of Invention

The invention aims to provide an electrically-assisted sewage treatment system to improve the number and activity of microorganisms in phosphorus-containing return sludge in an AAO treatment process.

In order to achieve the purpose, the electric auxiliary sewage treatment system comprises a sewage tank, a grid tank, a grit chamber, an AAO biological treatment system and a secondary sedimentation tank which are sequentially connected; the secondary sedimentation tank is used for settling the sewage; the secondary sedimentation tank is connected with a drainage pipeline, and the drainage pipeline is used for discharging the purified water subjected to sedimentation separation in the secondary sedimentation tank; the secondary sedimentation tank is connected with a sludge return pipeline; the sludge return pipeline is connected with the sludge activator; part of sludge settled and separated in the secondary sedimentation tank flows back to the sludge activator through a sludge return pipeline; the sludge activator is connected with a nutrient solution supply device and a micro-nano aerator; the sludge activator is also connected with a low-voltage direct-current power supply system; the low-voltage direct-current power supply system comprises an alternating-current power supply, a rectifier transformer, a positive electrode and a negative electrode; the positive electrode and the negative electrode are arranged inside the sludge activator; the alternating current power supply, the rectifier transformer, the positive electrode and the negative electrode form a closed circuit; the sludge activator is connected with the AAO biological treatment system through a pipeline.

In addition, the electric auxiliary sewage treatment system also comprises a sludge storage tank; the sludge storage tank is connected with the secondary sedimentation tank; the sludge storage tank is used for storing residual sludge settled and separated in the secondary sedimentation tank; the mud storage pool is connected with a desliming machine room; the desliming machine room is connected with the water inlet of the grid pool through a filtrate return pipeline.

The AAO biological treatment system comprises an anaerobic tank, an anoxic tank and an aerobic tank which are connected in sequence, and the sludge activator is respectively connected with the anaerobic tank, the anoxic tank and the aerobic tank through pipelines; aeration devices are arranged in the anoxic tank and the aerobic tank; the aeration device comprises a microporous aerator arranged at the bottom of the anoxic tank or the aerobic tank.

Preferably, the low-voltage dc power supply system further includes an electromagnetic relay.

The nutrient solution feeder consists of a nutrient solution tank, a conveying pipe and an electromagnetic valve; the nutrient solution consists of glucose, sodium bicarbonate, ammonium chloride, potassium dihydrogen phosphate and a small amount of trace elements.

The positive electrode and the negative electrode are both graphite electrodes or stainless steel electrodes.

Advantageous effects

The electrically-assisted sewage treatment system can increase the number and activity of microorganisms in the returned sludge by the assistance of weak direct current, so as to realize the online proliferation and activation of the microorganisms; the degradation capability of microorganisms on organic matters in the sewage is ensured; the treatment efficiency of the AAO biological treatment system can be improved.

Drawings

FIG. 1 is a schematic view of the overall structure of an electrically-assisted wastewater treatment system according to the present invention.

FIG. 2 is a schematic diagram of the structure of the sludge activating apparatus according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. As used herein, the word "comprising" and similar words are intended to mean that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items.

Aiming at the problems in the prior art, the embodiment of the invention provides an electrically-assisted sewage treatment system.

Examples

An electric auxiliary sewage treatment system comprises a sewage tank 1, a grid tank 2, a grit chamber 3, an AAO biological treatment system and a secondary sedimentation tank 4 which are connected in sequence; the secondary sedimentation tank 4 is used for settling sewage; the secondary sedimentation tank 4 is connected with a drainage pipeline which is used for discharging the purified water settled and separated in the secondary sedimentation tank 4; the secondary sedimentation tank 4 is connected with a sludge return pipeline; the sludge return pipeline is connected with the sludge activator 5; the part of sludge settled and separated in the secondary sedimentation tank 4 flows back to the sludge activator 5 through a sludge return pipeline; the sludge activator 5 is connected with a nutrient solution supply device 6 and a micro-nano aerator 7; the sludge activator 5 is also connected with a low-voltage direct-current power supply system; the low-voltage direct-current power supply system comprises an alternating-current power supply 8, a rectifier transformer 9, a positive electrode 10 and a negative electrode 11; the positive electrode 10 and the negative electrode 11 are installed inside the sludge activator 5; the alternating current power supply 8, the rectifier transformer 9, the positive electrode 10 and the negative electrode 11 form a closed circuit; the sludge activator is connected with the AAO biological treatment system through a pipeline.

The grid tank 2 and the grit chamber 3 are both in the prior art, a coarse grid and a fine grid are usually arranged in the grid tank, and the coarse grid is used for intercepting coarse suspended matters and impurities in sewage; the fine grid mainly removes some fine particles and suspended matter from the sewage.

The electric auxiliary sewage treatment system also comprises a sludge storage tank 12; the sludge storage tank 12 is connected with the secondary sedimentation tank 4; the sludge storage tank 12 is used for storing the residual sludge settled and separated in the secondary sedimentation tank 4; the mud storage pool 12 is connected with a desliming machine room 13; the desliming machine room 13 is connected with the water inlet of the grating pool 2 through a filtrate return pipeline.

The AAO biological treatment system comprises an anaerobic tank 14, an anoxic tank 15 and an aerobic tank 16 which are connected in sequence, and the sludge activator is respectively connected with the anaerobic tank 14, the anoxic tank 15 and the aerobic tank 16 through pipelines; aeration devices are arranged in the anoxic tank 15 and the aerobic tank 16; the aeration device comprises a microporous aerator 17 arranged at the bottom of the anoxic tank or the aerobic tank. The AAO biological treatment system utilizes an activated sludge process to biologically remove nitrogen and phosphorus; the anaerobic tank 14, the anoxic tank 15 and the aerobic tank 16 all have the function of removing BOD, namely organic pollutants; phosphorus release of phosphorus accumulating bacteria also occurs in the anaerobic tank 14, and denitrification of denitrifying bacteria occurs in the anoxic tank 15 to convert nitrate nitrogen into nitrogen; phosphorus accumulating bacteria may release phosphorus, absorb phosphorus, or exist at the same time; the aerobic tank mainly performs nitration reaction to convert ammonia nitrogen into nitrate nitrogen, and the phosphorus-accumulating bacteria excessively absorb phosphorus; the AAO biological treatment system is the existing treatment process, and the main improvement of the embodiment is that the returned sludge of the secondary sedimentation tank 4 is sent into the anaerobic tank 14 after being subjected to online microbial proliferation and activation; culturing microorganisms in the returned sludge in the sludge activator 5 and stimulating by weak direct current by matching a low-voltage direct current power supply system with a micro-nano aerator 7 and a nutrient solution supply device 6; weak direct current stimulation can improve the properties of the microbial cell surface; for example, the surface area of microbial cells is increased, thereby improving the capacity of degrading organic matters; the propagation speed and the pH tolerance of the microorganisms can be improved; thereby increasing the number of microorganisms within the AAO biological treatment system and the ability to withstand the external environmental influences.

The low-voltage direct-current power supply system further comprises an electromagnetic relay 18, and the electromagnetic relay 18 is used for controlling the on-off of the circuit.

The nutrient solution supplier 6 is composed of a nutrient solution tank 61, a conveying pipe 62 and an electromagnetic valve 63; the nutrient solution consists of glucose, sodium bicarbonate, ammonium chloride, potassium dihydrogen phosphate and a small amount of trace elements.

The positive electrode 10 and the negative electrode 11 are both graphite electrodes or stainless steel electrodes.

The electrically-assisted sewage treatment system is improved based on the AAO treatment system in the prior art, the microorganisms for proliferation and activation in the embodiment come from the system, can be directly used in the sewage treatment of the original system without domestication, has strong adaptability to various physical and chemical indexes of the sewage of the original system, activates the microorganisms through weak direct current, improves the capability of the microorganisms for degrading organic matters, and can obviously improve the treatment efficiency of the sewage treatment system.

Although the embodiments of the present invention have been described in detail hereinabove, it is apparent to those skilled in the art that various modifications and variations can be made to these embodiments. However, it is to be understood that such modifications and variations are within the scope and spirit of the present invention as set forth in the following claims. Moreover, the invention as described herein is capable of other embodiments and of being practiced or of being carried out in various ways.