Abstract:

In present work，a baffled reactor was used to treat high concentration organic wastewater using Fe as anode and modified graphite felt as cathode. The effect of current density，initial pH，electrolyte concentration and electrolysis time on the COD removal were investigate. The optimal peroxi⁃coagulation conditions were as follows：initial pH 7.2，electrolyte concentration 0.05 mol/L，applied current density 8 mA/cm²，and electrolysis time 90 min. Under this condition，55% COD removal rate was observed. Then 264 h continuous measurement was carried out under optimum condition to investigate the stability of reactor and electrode，and the result showed that（50±5）% COD removal was observed. Compare with regular electrocoagulation and polymeric ferric sulfate coagulation，peroxi⁃coagulation revealed the highest COD removal and lowest cost for pretreating organic wastewater. Crushed coal pressure gasification wastewater，reverse osmosis brine from landfill leachate，fine chemical industry wastewater，and high temperature cooking waste water were pretreated by peroxi⁃coagulation，respectively. The results suggested that the COD removal rate ranged from 23% to 55%，and the energy costs of per kilogram COD ranged from 2.2 to 9.4 yuan.

Key words: high concentration organic wastewater, peroxi?coagulation, modified graphite felt, pretreatment

摘要：

以Fe作为阳极，改性碳毡作为阴极，利用折流式反应器对不同类型高浓有机废水进行预处理研究。对电流密度、初始pH、电解质浓度、反应时间等工艺参数进行考察。过氧絮凝预处理的最佳工艺条件：初始pH为7.2，电解质浓度为0.05 mol/L，电流密度为8 mA/cm²，反应时间为90 min，对应的COD去除率为55%。在此条件下进行了264 h的长周期测试以考察反应器和电极的稳定性，结果表明长周期处理过程中COD去除率为（50±5）%。与常规电絮凝和聚合硫酸铁絮凝预处理相比，相同条件下过氧絮凝对高浓有机污水的处理效果最佳，综合处理成本最低。采用过氧絮凝法分别对煤气化废水、垃圾渗沥液反渗透浓水、精细化工废水、高温焦化废水进行预处理，过氧絮凝对不同种类的废水表现出不同的降解效果和能耗水平，COD去除率为23%~55%，每处理1 kg COD的能耗成本为2.2~9.4元。

关键词: 高浓有机废水, 过氧絮凝, 改性碳毡, 预处理

CLC Number: 

• X703.1