Study On Qualified Discharge Of Waste Water In Industrial Region

The waste water in industrial area, which is unbiodegradable, contains complicatedcomponents with fluctuating water quality and quantity. Current waste water treatmenttechnology cannot reach the standard of emission. The paper focuses on the study ofcomprehensive waste water treatment in industrial regions by conducting series ofindustrial test and research and adopting “hydrolytic acidification+MBBR+coagulatingsedimentation” as the main technology in order to provide theoratical as well as technicalsupport for the initiation and operation of the system. Main concepts and conclusions areas follows:(1)Adopting the combined technology of “hydrolytic acidification+MBBR+coagulating sedimentation”, the system, when under stable operating conditions, produceswater of which the quality meets the requirement of the Wastewater DisposalComprehensive Discharge Standard (GB18918-2002).(2)When the experiment starts, the sludge inoculation concentration of the hydrolyticacidification pool is7gVSS/L. The COD of inflow should be controlled at400-550mg/Land starting loading at0.2kg COD/(m~3d). The volume loading (VLR) can be graduallyincreased by raising the water inflow. After73days of operation, the pool achievesstable operating conditions. When the operation temperature is between10℃～26℃andthe PH between7-9, no obvious impact would be shown on the treatment of hydrolyticacidification pool. The optimum hydrolytic retention (HRT) is6hours. Hydrolyticacidification pool significantly improves the biodegradability of wastewater, with adramatic raise in B/C value from0.25～0.31to0.37～0.44.(3)When poured in MBBR pool, the waste water reaches4gVSS/L in sludgeinoculation concentration with the COD of inflow reaches320～420mg/L, starting load at0.25kg COD/(m~3d) and B/C between0.39～0.42. Following the same process in thehydrolytic acidification pool, after60days of operation, the pool achieves stable operatingconditions. No obvious impact is shown on the treatment of MBBR pool when underroom temprature(20℃~25℃). The suitable DO concentration value should be between2～3mg/L, and the optimum HRT in MBBR pool is26hours.(4)Dosing15mg/L of PAC, which is used as coagulant, the COD removal rate reachits peak, leading to best effect in coagulation treatment.