新配方镀铜铁屑处理印染废水提标排放的试验
Experiments on treatment of dye wastewater with new formula copper-coated iron scrap for standard raising discharge
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摘要: 本研究采用新配方镀铜铁屑催化铁内电解体系处理某印染厂二沉池出水提标排放，并和传统置换法制备的镀铜铁屑的处理效果作了比较；同时采用SEM分析对镀层的微观形态进行了表征.水处理批量试验结果表明，这两种铁屑都能有效去除废水COD，但新配方镀铜铁屑具有更高的去除效率，这种优势在酸性条件下尤其显著，这是因为新配方镀铜铁屑具有镀层与金属铁结合牢固和镀层抗氧化性好的特点.采用新配方镀铜铁屑批量处理废水，当水里溶解氧浓度控制在0.5 mg·L-1，COD在2 h内从185 mg·L-1降到58 mg·L-1，去除率达到69.5%.铁用量很小，仅为5.83 mg·L-1，工艺运行成本低.连续流试验结果表明，与传统老配方比较，新配方镀铜铁屑具有处理效率高、效果稳定的优势；经新配方铁屑处理2 h后，COD和色度的去除率分别达到63%和80%.出水可以排入总厂的污水处理车间经生物处理达标后排放.Abstract: In this study, a catalytic iron internal electrolysis system filled with a new formula copper-coated iron scrap was used to treat the effluent discharged from the secondary sedimentation tank of a textile factory for standard raising discharge. The treatment effect was compared with that of copper-coated iron scrap prepared by traditional replacement method. Meanwhile, the microstructure of the coating was characterized by SEM analysis. The water treatment batch test results showed that the two kinds of iron scrap effectively removed COD in wastewater, but the new formula copper-coated iron scrap had higher removal efficiency, especially under acidic conditions, because the new formula copper-coated iron scrap had the characteristics of firm combination between the coating and iron and good oxidation resistance of the coating. The batch water treatment experiments with the new formula copper-coated iron scrap showed that under the conditions of wastewater dissolved oxygen of 0.5 mg·L-1 and reaction time of 2 h, COD was reduced from 185 mg·L-1 to 58 mg·L-1, the removal rate reached 69.5%, the iron consumption was very small, only 5.83 mg·L-1, and the process operation cost was low. The continuous flow test results showed that compared with the traditional formula iron scrap, the new formula iron scrap had high treatment efficiency and stable effect. The COD and color removal rate of the effluent treated with the new formula iron scrap for 2 h reached 63% and 80% respectively. The effluent could be biologically treated in the sewage treatment workshop of the factory and discharged after reaching the effluent standard.
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