LangfangtownDomestic sewage treatment equipmentThe main treatment is the sewage and various detergents, garbage, feces, etc. used in daily life in the community. The domestic sewage in this community contains mostly nitrogen, phosphorus, and sulfur, and there are many carcinogenic bacteria. The domestic sewage treatment process generally determines the degree of sewage treatment and corresponding treatment process based on the utilization or discharge direction of sewage and considers the natural purification capacity of the water body. The treated sewage is partially used for greening and irrigation.

Township domestic sewage treatment equipment generally adopts the following biological treatment methods:

① Conventional activated sludge process: Conventional activated sludge process is widely used in large-scale sewage treatment, but due to its low load, easy sludge expansion, and difficult control and management, its use in small-scale sewage treatment plants has been decreasing in recent years.

② A/O process: The A/O process uses activated sludge as a biological carrier and achieves oxygenation of sewage through the action of fan oxygen supply and aeration. Mechanical agitation is installed in tank A, and the reflux liquid from tank O flows back to tank A. Denitrification reaction is carried out in tank A, reducing most of the nitrate nitrogen to nitrogen gas, and nitrogen gas is overflowed from the wastewater through agitation, achieving the goal of removing ammonia nitrogen; The effluent from tank A flows to tank O, which is equipped with blast aeration to remove most organic pollutants and convert most of the ammonia nitrogen in the influent into nitrate nitrogen; The concentration of activated sludge in the O-stage tank can be adjusted according to the needs of the wastewater, and the organic matter in the wastewater can be adsorbed, oxidized, and decomposed through the microbial flocs in the activated sludge; High removal rate of organic matter and ammonia nitrogen. However, due to the lack of an independent sludge return system, it is not possible to cultivate sludge with unique functions, resulting in a lower degradation rate of difficult to degrade substances; At the same time, in order to improve denitrification efficiency, it is necessary to increase the internal circulation ratio, which increases operating costs. In addition, the internal circulation liquid comes from the aeration tank and contains a certain amount of DO, which makes it difficult to maintain the ideal anoxic state in section A, affecting the denitrification effect and making it difficult to achieve a denitrification rate of 90%.

③ SBR method; SBR method is a relatively advanced activated sludge treatment method developed in recent years. This treatment process integrates an aeration tank and a sedimentation tank, with continuous water inflow, intermittent aeration, and sewage sedimentation and removal of supernatant when the gas is stopped, forming a cycle that repeats itself. The SBR method does not have sedimentation tanks or sludge return equipment, but it operates intermittently and requires multiple treatment units. The inflow and aeration are switched between each other, making the control more complex. In order to ensure the overflow rate, the SBR method requires high manufacturing standards for the decanter equipment, and must strive for excellence during production, otherwise it is easy to cause the final effluent water quality to not meet the standards. At present, there are no high-quality decanting equipment in China, and the procurement of imported equipment is troublesome and expensive. At the same time, the maintenance costs will also be high in the future. The sludge concentration in the SBR process tank is measured by a concentration meter to control the amount of excess sludge discharged. Currently, the immaturity of concentration meter technology in China can lead to difficulties in controlling SBR sludge discharge.

④ Contact oxygen: Chemical biological contact oxidation method is a traditional biochemical treatment method, and the biological filler is a semi soft filler on a fixed bed. Using semi soft fillers as attachment carriers for microorganisms. The organisms are evenly distributed on the biological packing, which avoids the phenomenon of uneven distribution of microorganisms. At the same time, the organisms adhere to the surface of the packing and do not flow with water. Due to the strong agitation of the rising airflow, the biofilm is constantly renewed, thereby improving the purification effect. The contact oxidation method has the advantages of short treatment time, small volume, good purification effect, good and stable effluent quality, no need for sludge reflux or expansion, and low power consumption. Its main characteristics are: high volumetric load, strong resistance to impact load; Having the advantages of membrane method, with less residual sludge; It has the advantages of activated sludge process, supplemented by mechanical equipment for oxygen supply, high biological activity, and short sludge age; Can decompose substances that are difficult to decompose by other biological treatments; Easy to manage, eliminating drawbacks such as sludge flotation and expansion. In summary, the biological treatment of this project is planned to adopt the "hydrolysis acidification+contact oxidation method".

Solutions and technical features for rural life

Based on the actual investigation of the community, our company's technical team has developed a corresponding process flow for the community, effectively solving the daily sewage treatment problem in the community.

1. The combination of hydrolysis acidification and biological contact oxidation method effectively improves the treatment effect, and the treated water can meet the national discharge standards.

2. The generated sludge is minimal, and the sludge generated at each stage can be recycled and digested, with regular extraction of the final sludge.

3. The process flow can be organically combined and can be buried underground. On the surface, parking lots or green lawns can be built to decorate the surrounding environment.

4. This complete set of equipment has high automation, with automatic operation of equipment such as fans and pumps in the system, reducing operational workload. This equipment adopts effective measures to reduce noise and odors, and has no impact on the surrounding environment.

5. After deep treatment, the effluent can be reused.

The effect of township domestic sewage treatment equipment after treatment

The effluent quality of the sewage treatment system designed for this community is good, and the main water quality indicators can meet the discharge standards. It can adapt well to the unstable inlet water quality, and the effluent of the system can meet the comprehensive sewage discharge level one standard, effectively solving the current situation of effluent color not meeting the standard. According to actual requirements and design processes, a combination of hydrolysis acidification and biological contact oxidation is adopted to improve water quality, meet effluent standards, and ensure the long-term stable operation of the sewage treatment system.