铁碳微电解在造纸废水处理工艺中合理位置的探究

Inquiry into the reasonable position of iron-carbon micro-electrolysis in paper-making wastewater treatment

针对造纸废水处理成本高的问题,采用循环伏安法对某造纸厂初沉、厌氧和好氧出水的氧化还原特性进行了分析,并以反应时间、COD去除率、可生化性、铁利用率及运行成本为指标,确定了增设的铁碳微电解在处理工艺中的合理位置。结果表明,厌氧出水含有较多易氧化和易还原性有机物,当铁碳微电解反应时间为30 min时,厌氧出水COD去除率可达63.09%,BOD5/COD可由0.11提高至0.18。将铁碳微电解置于厌氧单元后,形成初沉—厌氧—铁碳微电解—好氧—混凝的工艺,是较为合适的。

In view of the problem of high cost in the treatment of paper-making wastewater,cyclic voltammetry（CV）has been used for the analysis on the redox characteristics of primary settling effluent,anaerobic effluent,and aerobic effluent. Considering the reaction time,removing rate of COD,biodegradability,iron utilization and operating costs as indexes, the optimal position of supplementary iron-carbon micro-electrolysis in the treatment process has been determined. The results show that anaerobic effluent contains more easily oxidized and reduced organic matter. When the reaction time is 30 min,the removing rate of COD of anaerobic effluent reaches 63.09%,and the BOD5/COD can be improved from 0.11 to 0.18. It is more appropriate to set the iron-carbon micro-electrolysis after the anaerobic unit,so as to form the process of primary sedimentation-anaerobic-iron-carbon micro-electrolysis-aerobic-coagulation.