citysewageWater locationTheory is a complex and crucial systematic engineering，Related to urban ecology and residents' healthThis process mainly relies on facilities such as septic tanks, sewage treatment plants, and fecal disposal stations, aiming to achieve the harmless, resourceful, and reduced disposal of feces.

In urban ecosystems, septic tanks are the first station for sewage treatment. Usually, a three compartment sealing design is used to sequentially complete the interception and sedimentation, preliminary fermentation, re fermentation, re sedimentation, filtration and other processes. The organic matter in the sediment is cleaned and reprocessed to remove residual suspended solids and some pathogens. The relatively clear sewage is discharged to the sewage treatment plant for deep purification. When it meets the national discharge standards, it is recycled for agricultural irrigation, urban fire protection, and road cleaning.

Settling organic matter, commonly known asFecal residue，It is the main solid product after septic tank treatment. Although it looks dirty, it is actually a valuable resource rich in organic matter and nutrients. Mix manure with straw, sawdust, etc,By composting methodFermentation under aerobic conditions. Microorganisms decompose organic matter, producing high temperatures to kill pathogens and insect eggs, ultimately forming stable humus. This humus is a high-quality organic fertilizer that can be used for farmland, orchards, and landscaping. Put the manure into a closed anaerobic reactor for fermentation, producing biogas and sludge. Biogas can be used as a clean energy source for power generation or heating, while biogas residuealsoIt is a great organic fertilizer.Through scientific processing, the reuse and regeneration of manure has shown excellent performance in improving soil structure, increasing crop yields, and providing clean energy.

Urban domestic sewageThe handling is a process fromThe wonderful journey from 'waste' to 'resources'. Through scienceThrough land treatment and resource utilization, we can not only reduce environmental pollution, but also provide valuable resources and energy for cities.