Sewage Treatment Process of Nanjing Chengbei Sewage Treatment Plant

Water treatment process: the process flow includes anaerobic or micro-aerobic contact mixing, short-time aeration, separation, aerobic hungry sludge reflux or direct water inflow during SBR, so that raw sewage and aerobic hungry sludge are fully contacted and mixed, short-time aeration, precipitation and separation; The supernatant after sedimentation and separation is treated effluent, and most of the sludge after sedimentation and separation is hungry under aerobic conditions. The hungry sludge repeatedly contacts with the original sewage, and the rest is discharged as surplus sludge. The process system is mainly composed of AC cell, AeT cell, AS cell and AeS cell which are connected in turn.

A new oily sludge treatment process includes the following steps: firstly, hot water at 70-85 DEG C is added to oily sludge, and the adding amount is that the ratio of oily sludge to hot water is between 1: 3- 1: 1; After stirring, the sludge and water are fully mixed until the oil reaches equilibrium in the solid phase and the liquid phase, and then clear water is introduced for circulating oil separation to separate the oil from the mixed phase; When the floating oil in the mixed phase is separated by oil, the oily sludge is washed in the reactor, and then the sludge is separated by swirl injection and centrifugal separation. It is simple, efficient, low in cost and high in treatment efficiency. It is suitable for the treatment of landing oil, tank bottom mud and sludge in petroleum refining, and has great application value and popularization prospect.