Zgajnar Gotvajn A, Derco J, Tisler T, Cotman M, Zagorc-Koncan J
University of Ljubljana, Askerceva 5, Ljubljana SI-1000, Slovenia.
Water Sci Technol. 2009;60(3):597-603. doi: 10.2166/wst.2009.400.
The objective of this investigation was determination of feasibility of ozonation for treatment of leachates from municipal landfill. Efficiency of ozonation was determined for two leachates, different in age, composition and toxicity. We have studied the impact of ozonation time on removal of organics. The efficiency of treatment was monitored by COD, BOD(5) and DOC analyses, removal of nitrogen compounds, as well as changes in toxicity. Therefore, acute toxicity tests with luminiscent bacteria Vibrio fischeri, Daphnia magna and nitrifying organisms of activated sludge (ammonium oxidation) were performed prior and after ozonation experiments. It has been confirmed that longer time of ozonation does not bring significantly better results regarding treatment of young leachate (36% in 20 minutes, 42% in 120 minutes). Two steps kinetics observed resulted in minor detoxification regarding luminiscent bacteria and no changes in effects to daphnids. More effective was ozonation of the stabilized leachate. Removal of COD reached 50% in 80 minutes and 65% in 120 minutes. Detoxification was also observed. Presented research confirmed, that ozonation itself was not effective treatment methods for investigated types of leachates for reduction of their hazardous impacts to meet regulatory effluent limits.
本研究的目的是确定臭氧氧化法处理城市垃圾渗滤液的可行性。针对两种在年龄、成分和毒性方面存在差异的渗滤液，测定了臭氧氧化的效率。我们研究了臭氧氧化时间对有机物去除的影响。通过化学需氧量（COD）、生化需氧量（BOD₅）和溶解性有机碳（DOC）分析、氮化合物的去除以及毒性变化来监测处理效率。因此，在臭氧氧化实验前后，分别对费氏弧菌、大型溞等发光细菌以及活性污泥中的硝化生物（铵氧化）进行了急性毒性试验。已证实，对于年轻渗滤液的处理，较长时间的臭氧氧化并不会带来显著更好的效果（20分钟时为36%，120分钟时为42%）。观察到的两步动力学导致对发光细菌的解毒作用较小，对大型溞的影响没有变化。对稳定化渗滤液进行臭氧氧化更为有效。80分钟时COD去除率达到50%，120分钟时达到65%。同时也观察到了解毒现象。本研究证实，对于所研究的渗滤液类型，臭氧氧化本身并非有效的处理方法，无法降低其有害影响以达到监管排放限值。
