摘要
采用电Fenton联用电絮凝工艺处理晚期垃圾填埋场的渗滤液,研究最佳工艺处理条件,并考察处理前后出水的理化指标及对斑马鱼胚胎毒性的变化。结果表明,在三电极电解体系中分别以铸铁为阴阳电极、甘汞为参比电极,操作电压1 V、2 m L H2O2和p H=3时,300 m L渗滤液经电Fenton工艺处理60 min后,出水COD去除效率接近90%,其余指标亦显著改善,但对斑马鱼胚胎发育仍显示一定毒性;之后在操作电压1 V和溶液近中性时,联用电絮凝工艺继续处理30min,出水COD可达到国家排放标准,斑马鱼胚胎凝结率、孵化率、心包水肿和脊柱畸形发生率均与空白组无显著差异。结合理化分析与生物毒性评价,证实2种电化学工艺联用是一种经济有效的渗滤液处理工艺。
The mature landfill leachate was treated with the electro-Fenton process assisted by electro-coagulation. The processes were all set in the three electrolytic cells with irons as anode and cathode. The optimum conditions were investigated and the physicochemical,toxic indicators were determined before and after the treatment. The data showed that the electro-Fenton process was taken under the constant 1 V,p H = 3,and addition of 2 m L H2O2. Being treated 60 min,outflowing leachate was then sent to the electro-coagulation process for 30 min under the constant 1 V and neutral solution. The final COD reduced to a negligible level and zebrafish embryos also did not display the significant reproductive toxicity. Compared to the control,there was little significant difference on condensation rate,hatching rate,pericardial edema and spinal deformity of the exposed embryos. It should be noted that the acute and chronic toxicity of embryos persists after treatment by electro-Fenton process. Whatever physiochemical or toxical aspects were considered,electro-Fenton process combined with electro-coagulation were suggested to be an economic,efficient,and feasible water treatment to confirm the safer discharge of effluents.
出处
《环境工程学报》
CAS
CSCD
北大核心
2015年第6期2625-2630,共6页
Chinese Journal of Environmental Engineering
基金
国家青年科学基金资助项目(21407101
21406211)
山西省青年科学基金资助项目(2012021008-1)
关键词
电FENTON
电絮凝
渗滤液
毒性
electro-Fenton
electro-coagulation
landfill leachate
toxicity
