强化混凝-光电氧化组合技术深度处理垃圾渗滤液

Treatment of landfill leachate by an enhanced coagulation and photoelectro-oxidation process

采用铁锰氧化物+聚合氯化铝(PACl)混凝和光电氧化技术处理已生化处理过的垃圾渗滤液,研究了组合工艺对渗滤液化学需氧量(COD)、总有机碳(TOC)、氨氮和色度的去除效果.结果表明,在一定铁锰复合氧化物投量下,加入PACl共同混凝可以取得较好的有机物去除效果,当铁锰氧化物投量为600mg·L-1,PACl投量为100mg·L-1时,垃圾渗滤液中的COD可由1400mg·L-1降低到920mg·L-1,去除率为32%.混凝工艺处理后,光电氧化技术可进一步去除渗滤液中的COD和TOC.光电氧化效果随着电流密度的增加而提高,且在反应初期对有机物的降解速度较快,反应60min后,降解速度变缓.当电流密度为400A.m-2,9W紫外灯(主波长254nm)辐照,反应180min后,COD和TOC的去除率分别为76.8%和81.2%,色度和氨氮的去除率均达到99%.

Treatment of landfill leachate by Fe/Mn oxide combined with PACl coagulation followed by a photoelectro-oxidation process was studied in this paper. The performance of the combined process for the removal of chemical oxygen demand （COD）,total organic carbon （TOC）,ammonia,and color were evaluated. Fe/Mn oxide with certain dosage exhibited high removal efficiency when dosed with PACl. With doses of 600 mg·L^-1 Fe/Mn oxide and 100 mg·L^-1 PACl,the removal efficiency of COD with initial concentration of 1400 mg·L^-1 was 32%. Photoelectro-oxidation process can further increase the removal efficiency of COD and TOC. When the current density was 400 A·m^-2,the removal efficiencies of COD and TOC were 76.8% and 81.2%,respectively; the removal efficiency of color and ammonia were greater than 99%.