阴阳离子双隔膜三室电解槽电渗析处理垃圾渗滤液

摘要

Electrodialysis and Fenton reagent method were combined to decrease the concentration of NH_4~+ -N and COD_(Cr) in landfill leachates by means of coupling membrane triple chamber cell. NH_4~+ -N in landfill leachates was enriched in catholyte by electrodialysis, then removed by chemical precipitation. In the meantime, Fe~(2+) was generated at the Fe anode. H_2O_2 was dropped into the anolyte to produce Fenton reagent, which could degrade organic compounds and decrease the concentration of COD_(Cr). The experimental results show that the removal rate of NH_4~+ -N in simulated wastewater was up to 80% , and the concentrations of NH_4~+ -N and COD_(Cr) in the landfill leachates were decreased from 1 982 mg/L and 2 248 mg/L to 200 mg/L and 127 mg/L, respectively.%采用阴阳离子双隔膜三室电解槽,将电渗析技术与Fenton试剂法结合,去除垃圾渗滤液中氨氮和COD_(Cr). 垃圾渗滤液中的氨氮通过电渗析技术富集到阴极液中,随后用化学沉淀法加以去除. 同时,在铁阳极上生成的Fe~(2+)离子,与滴加入阳极液中的H_2O_2反应生成Fenton试剂,降解有机物,降低COD_(Cr). 实验结果表明,模拟废水中的氨氮透过率达80%,垃圾渗滤液中氨氮浓度和COD_(Cr)由原来的1 982和2 248 mg/L分别降至200和127 mg/L.