Process Description and Characteristics of Domestic Sewage Treatment Equipment

The domestic Sewage Treatment process is mainly used for purifying domestic sewage from hotels, restaurants, schools, government agencies and factories, so that the treated sewage meets the prescribed discharge standards. 

 

II. Process Characteristics: 

 

By combining hydrolysis acidification with biological contact oxidation, the treatment effect has been effectively improved, and the treated water can meet the national discharge standards. 

2. The amount of sludge produced is small. The sludge generated at each stage can be refluxed for digestion, and the final sludge is extracted regularly. 

3. The process flow can be organically integrated. It can be set underground or in a basement, or it can be buried. When buried underground, the top of the equipment can be used as a parking lot or a green lawn, blending in with the surrounding environment. 

 

 

4. The equipment has a high degree of automation. Pumps and other equipment operate automatically, reducing the workload of operation. This equipment adopts effective measures to reduce noise and odor, having no impact on the surrounding environment.

The effluent can be recycled after undergoing advanced treatment. 

The BOD/COD ratio of domestic sewage is above 0.5, which indicates good biodegradability. Therefore, the A/O/O biological contact oxidation + membrane filtration process is proposed to be adopted. This process is simple to operate, has low running costs, good treatment effect and stable operation. It is a relatively mature domestic sewage treatment process at present and can effectively ensure the standard discharge of sewage. 

 

III. Process Description 

 

The KFMBR (Anoxic Membrane Bioreactor) process is a new type of MBR process. This process integrates the membrane module and the biological reactor into an integrated device. Through the combined action of microorganisms and membranes, pollutants are effectively removed. The schematic diagram of the reactor is shown in Figure 1. By optimizing the aeration method and controlling the aeration volume, the dissolved oxygen concentration in the membrane module area of the reactor is maintained at 1-2 mg/L, while the dissolved oxygen concentration in the other areas is less than 1 mg/L. The entire system forms an anoxic environment and a dynamic balance ecosystem dominated by anoxic bacteria and complex bacterial communities. This bacterial system has a cycle balance similar to the natural food chain. Microorganisms proliferate and metabolize by degrading organic matter in the wastewater. The proliferating and dying bacteria themselves can also be used as a nutrient source for other bacteria and be metabolized and decomposed into inorganic substances such as CO2 and H2O, ultimately forming a dynamic balance. After reaching the equilibrium point, the organic residual sludge in the system will not accumulate and grow, achieving near-zero discharge of organic residual sludge.