Urban sewage treatment It refers to the process of treating and purifying the sewage generated in the process of urban life and industrial production to meet the requirements of environmental protection and sanitation and ensure the sustainable use of water resources.
Urban sewage treatment usually involves the following steps:
1. Primary treatment: primary treatment is mainly to remove large particles, suspended solids, sediment and other solid substances through physical processes, including grids, sand tanks, sedimentation tanks and other equipment, and further purify sewage through sedimentation and particle separation.
2. Secondary treatment: secondary treatment is mainly through biochemical processes, such as activated sludge process or fixed membrane bioreactor (MBR). Through the action of microorganisms, the pollutants such as organic matter, nitrogen and phosphorus can be transformed into degradable substances, and the concentration of suspended solids and dissolved organic substances in water can be reduced.
3. Advanced treatment: further technologies can be selected for advanced treatment as required, such as filter, artificial wetland, ultraviolet disinfection, etc. These technologies further remove residual organic substances, microorganisms and other pollutants to ensure that the discharged sewage meets environmental standards.
four Sludge treatment ： waste water treatment The sludge generated in the process needs to be treated. Common treatment methods include sludge thickening, dewatering, digestion and solidification to reduce its volume and make it easier to dispose or recycle.
The goal of urban sewage treatment is to remove harmful substances and pollutants from sewage, and ensure that the water quality discharged into the environment is stable and meets relevant standards. This helps to protect water quality, maintain ecological balance, and recycle water resources and energy to achieve recycling of resources.
It should be noted that urban sewage treatment needs to comprehensively consider the sewage characteristics, treatment capacity, investment costs and other factors in different regions. Reasonable selection of appropriate treatment process and equipment, regular inspection and maintenance of equipment, to ensure the stable operation and efficiency of the sewage treatment system.
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