Domestic sewage treatment refers to the discharge of sewage discharged from residents’ daily life after treatment to meet the sewage discharge standards. It mainly comes from residential buildings and public buildings, such as residences, institutions, schools, hospitals, shops, public places and industrial enterprise toilets. The pollutants contained in domestic sewage are mainly organic matter (such as protein, carbohydrate, fat, urea, ammonia nitrogen, etc.) and a large number of pathogenic microorganisms (such as parasite eggs and intestinal infectious viruses, etc.). The organic matter present in domestic sewage is extremely unstable and easily rots to produce stench. Bacteria and pathogens reproduce in large numbers using organic matter in domestic sewage as nutrients, which can lead to the spread of infectious diseases.
Treatment process
The core of domestic sewage treatment is the biochemical part, and the main processes include biological contact oxidation method and MBR membrane method.
Process one:
The biological contact oxidation method is a kind of aerobic biofilm method, which is improved and evolved from the contact aeration method on the basis of the biological filter, so it is also called “submerged filter method”, “contact aeration method” method” and “submerged biofilm method”, etc.
Processing technology two:
Membrane bioreactor (MBR for short) is a new type of high-efficiency sewage treatment and reuse process that combines biodegradation with high-efficiency membrane separation technology. It uses membrane separation equipment to intercept the activated sludge and macromolecular substances in the biochemical reaction tank, saves the secondary settling tank and mechanical filtration, and improves the separation efficiency of mud and water; through the high-efficiency interception effect of the membrane, the suspended solids are completely trapped in the biological reaction In the tank, the effluent water quality is improved, and the concentration of activated sludge is greatly increased. The hydraulic retention time (HRT) and sludge retention time (SRT) can be controlled separately, which greatly improves the efficiency of biochemical treatment. In this case, the refractory substances are reacting The continuous reaction and degradation in the container will help reduce the excess sludge production (even achieve zero sludge discharge) and reduce sludge treatment costs.
Summarize
Domestic sewage treatment generally determines the degree of sewage treatment and the corresponding treatment process based on the utilization or discharge of sewage and considering the natural purification capacity of the water body. Whether the treated sewage is used for industry, agriculture or recharge to replenish groundwater, it must meet the relevant water quality standards issued by the state. Huatai can supply different kinds of waste water treatment, any need please email to info01@cnoilmachine.com