Abstract
Lactic wastewater is a refractory high-concentration organic wastewater,and its treatment efficiency with traditional anaerobic processes is not high.The internal circulation(IC) reactor was used to treat this wastewater.It was successfully started up by taking measures including inoculating granular sludge,controlling the influent concentration,flow rate,VFA and temperature. The operation results show that IC reactor has high treatment efficiency and stable operation in treatment of lactic wastewater, and the removal rate of COD can reach 80%, thus reducing the treatment loads of subsequent aerobic processes, and ensuring that the effluent from the whole wastewater treatment system reaches second level criteria specified in the Integrated Wastewater Discharge Standard (GB8978-1996).The biogas produced in the IC reactor can be used for heating the raw wastewater.
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