Domestic sewage treatment process and treatment system

• Main Authors: XU JIN, KANG XIAORONG, SUN XIAOXU, TIAN FANG, GUAN QINGQING
• Format: Patent
• Language: Chinese; English
• Published: 19.10.2018
• Subjects: CHEMISTRY; METALLURGY; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention belongs to the technical field of sewage treatment and relates to a domestic sewage treatment process and treatment system. The domestic sewage treatment process comprises the followingsteps: (a) adding a coagulant in domestic sewage and then entering a phosphorus separation reaction tank for sludge and water separation to obtain sludge and first liquid supernatant; (b) after the sludge obtained in the step (a) is pretreated by a regulating tank, entering an anaerobic fermentation reactor for anaerobic fermentation to obtain a fermentation liquor; enabling the fermentation liquor to enter a phosphorus recovery device for phosphorous fertilizer recovery to obtain a phosphorous fertilizer and second liquid supernatant; (c) enabling the first liquid supernatant obtained in thestep (a) and/or the second liquid supernatant in the step (b) to enter a micro-oxygen denitrification reactor for biological denitrification to obtain treated and recovered purified water. The domestic sewage treatment process