酵母菌-活性污泥法吸附处理含铬电镀废水的性能

研究了解脂假丝酵母(Candida lipolytica 1977)、产朊假丝酵母(Candida utilis 1225)和活性污泥处理含铬电镀废水的吸附与还原性能.结果表明,解脂假丝酵母对废水的pH适应范围广.当pH=3.2～6.0时,25g/L菌体对电镀废水中30.2 mg/L总铬的去除率达85.0%;对27.7mg/L Cr⁶⁺的还原率高达100%.2株酵母协同处理电镀废水,可以有效的提高铬的生物吸附效率,对30.2 mg/L 总铬的去除率达91.1%.曝气生物吸附法研究结果表明,该法是本研究中处理含铬电镀废水最有效的方法.10g/L酵母菌,5g/L活性污泥处理50.3mg/L 总铬、46.2mg/L Cr⁶⁺水样8h后,去除率达93.8%;而当污泥浓度为10g/L时,去除率高达99.5%.

Adsorbing Capability of Chromium-galvanized Waste Water by Yeast-Activated Sludge

The capability of bioadsorption and bioreduction of chromium-galvanized wastewater by Candida lipolytica 1977, Candida utilis 1225, and activated sludge was discussed in this paper. The experimental results showed that the feasible pH range for C. lipolytica 1977 adsorption was wide. The removal and reduction ratios of C. lipolytica 1977 towards chromium-galvanized wastewater were 85.0%, and 100%, when pH was 3.2-6.0, and the concentrations of Cr(total) and Cr6+ were 30.2 mg/L, 27.7 mg/L respectively. The removal ratio increased to 91.1%, when the chromium-galvanized wastewater was treated by two strains together. The aerobic bioadsorption treatment of chromium-galvanized wastewater was investigated. The results demonstrated that this method was the optimal one for the treatment of this kind of wastewater in the study, the removal ratio was 93.8%, when the concentrations of yeast, activated sludge, Cr(total) and Cr6+ were 10 g/L, 5 g/L, 50.3 mg/L and 46.2 mg/L, respectively. The removal ratio increased to 99.5% accordingly, when the activated sludge content was 10 g/L.