Tang Qiong-Yao, He Pin-Jing, Xu Su-Yun, Zheng Zhong, Shao Li-Ming
State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze Science and Engineering, Tongji University, Shanghai 200092, China.
Huan Jing Ke Xue. 2008 Nov;29(11):3258-64.
The experiments focused on comparing the removal efficiencies of organic matters in fresh and mature landfill leachate by Fenton treatment. The changes in dissolved organic matter before and after Fenton treatment were assessed using gross organic parameters such as organic compound relative molecular mass (Mr) distribution, chemical oxygen demand (COD), total organic carbon (TOC) and the ratio of COD to TOC. The results from this study demonstrate that high Mr fractions of mature landffill leachate are more easily converted into dissolved small Mr fractions (Mr < 10(3)) by Fenton reaction than those of fresh landfill leachate, since the average Mr of mature landfill leachate is higher than that of fresh landfill leachate and the Mr > 10(5) fraction of the mature leachate account for 64% of the total mass. Operating parameters such as pH, [Fe2+] and [H2O2]/[Fe2+] demonstrate that the COD removal efficiency of the fresh landfill leachate (from 61% to 84%) is higher than that of the mature landfill leachate (from 31% to 60%), while it is converse for TOC (from 85% and 52% to 91% and 80% for the mature and fresh landfill leachate, respectively). Oxidation seems to play a more active role in COD reduction than coagulation whatever for the mature or fresh landfill leachate. Oxidation efficiency apparently controls coagulation efficiency, so that high oxidation efficiency may cause relatively low coagulation. The mass balances indicate that TOC removal by oxidation (TOCoxid) is more than COD removal by oxidation (CODoxid) for the mature landfill leachate while TOCoxid is less significantly than CODoxid for the fresh landfill leachate. The COD/TOC ratios are 1.17 and 1.58 for the initial mature landfill leachate and fresh landfill leachate, respectively, but they are 1.96 and 0.68 after Fenton treatment by oxidation, respectively. This phenomenon suggests that complete oxidations occur in the mature landfill leachate while both partial and complete oxidations occur in the fresh landfill leachate. The changes of CODcoag and TOCcoag illustrate that the oxidation state of the organic matters removed by coagulation in the mature landfill leachate is significantly lower than in the fresh landfill leachate.
实验着重比较了芬顿处理对新鲜和成熟垃圾渗滤液中有机物的去除效率。通过有机化合物相对分子质量（Mr）分布、化学需氧量（COD）、总有机碳（TOC）以及COD与TOC的比值等总体有机参数，评估了芬顿处理前后溶解有机物的变化。本研究结果表明，由于成熟垃圾渗滤液的平均Mr高于新鲜垃圾渗滤液，且成熟渗滤液中Mr>10(5)的部分占总质量的64%，因此芬顿反应使成熟垃圾渗滤液中高Mr组分比新鲜垃圾渗滤液中的高Mr组分更易转化为溶解的低Mr组分（Mr<10(3)）。诸如pH、[Fe2+]和[H2O2]/[Fe2+]等操作参数表明，新鲜垃圾渗滤液的COD去除效率（从61%至84%）高于成熟垃圾渗滤液（从31%至60%），而TOC的情况则相反（成熟和新鲜垃圾渗滤液的TOC去除率分别从85%和52%提升至91%和80%）。无论对于成熟还是新鲜垃圾渗滤液，氧化在COD降低方面似乎比混凝发挥着更积极的作用。氧化效率显然控制着混凝效率，因此高氧化效率可能导致相对较低的混凝效果。质量平衡表明，对于成熟垃圾渗滤液，通过氧化去除的TOC（TOCoxid）大于通过氧化去除的COD（CODoxid），而对于新鲜垃圾渗滤液，TOCoxid比CODoxid的显著程度更低。初始成熟垃圾渗滤液和新鲜垃圾渗滤液的COD/TOC比值分别为1.17和1.58，但经氧化芬顿处理后分别为1.96和0.68。这种现象表明成熟垃圾渗滤液中发生了完全氧化，而新鲜垃圾渗滤液中同时发生了部分氧化和完全氧化。CODcoag和TOCcoag的变化表明，成熟垃圾渗滤液中通过混凝去除的有机物的氧化态显著低于新鲜垃圾渗滤液中的。
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