Treatment of Enzymolysis Wastewater by Centrifuga- tion - Coagulation - Fenton Reagent Oxidation - Ad- sorption Process

摘要

[Objective]The study aimed to discuss the optimal conditions for the treatment of enzymolysis wastewater by centrifugation-coagulation-Fenton reagent oxidation-adsorption process.[Method]According to the water-quality characteristics of wastewater from a heparin sodium production factory of Jiangsu Province,enzymolysis wastewater was segregated from intestinal lavage wastewater and treated through centrifugation-coagulation-Fenton reagent oxidation-adsorption process,and the optimal technical parameters were determined.[Result]After enzymolysis wastewater was centrifuged at a speed of 4 000 rpm,0.6 g/L CTS as the coagulant was added to the supernatant.Hereafter,pH of the coagulated effluent was adjusted to 3,and then 1.5%(V/V)H2O2was added to the coagulated effluent;a certain amount of ferrous sulfate(n H2O2∶n FeSO4·7H2O=8∶1)was added to the mixture;the reaction conducted for 30 min,and then solution pH was adjusted to about9.Finally,the oxidized effluent flowed through a resin red until the adsorptive capacity reached 240 BV,and COD of the effluent water was lower than 100 mg/L,meeting the Grade-I standard of Comprehensive Discharge Standard of Sewage(GB8978-1996).[Conclusion]The research could provide a new process for the treatment of enzymolysis wastewater.