1. Understanding Urban Domestic Sewage

Urban domestic sewage refers to the wastewater discharged by residents in their daily lives, mainly from residences, institutions, schools, hospitals, shops, public places and industrial enterprise toilets.

Wastewater contains a large amount of grease, food residues, etc. Suspended solids are high, the color is large, and it is easy to smell.

Wastewater The concentration of organic matter, ammonia nitrogen and total phosphorus is generally relatively high, and direct discharge is easy to cause eutrophication of water bodies.

Second, common urban sewage treatment process

① Aerated biological filter

Aerated biological filter has the advantages of high organic load, small footprint, low investment, no sludge expansion, high oxygen transmission efficiency, and good effluent quality.

This process device consists of filter bed, air distribution device, water distribution device, drainage device, etc. The main working principle is to set fillers in the biological filter treatment device, and through artificial oxygen supply, a large number of microorganisms grow on the fillers, thereby removing nitrogen and phosphorus.