Ti（Ⅳ）催化臭氧／过氧化氢预处理酸性难降解废水

在Ti（Ⅳ）和过氧化氢存在条件下，考察了臭氧化酸性苯乙酮溶液、硝基苯溶液和垃圾渗滤液（浙江衢州某垃圾填埋场）的预处理效能。结果表明，在pH2．86条件下，单独臭氧化处理对苯乙酮、硝基苯和垃圾渗滤液的COD去除率分别为10．1％、44％和28．6％。BOD，／COD值分别从原来的0．039、0．060和0．085提高到了0．130、0．158和0．174，仍属生化难降解废水。当体系加入Ti（Ⅳ）后，臭氧化苯乙酮和硝基苯的COD去除率分别达到了75．5％和65％，BOD；／COD则提高到了0．679和0．314，可生化性提升明显。对于垃圾渗滤液，只有当体系加入Ti（Ⅳ）和H22后，臭氧化COD的去除率达到66．6％，BOD、／COD提高至0．425。上述结果对酸性难降解废水的处理实际意义非常突出。

Pretreatment of acid refractory wastewater by Ti（ Ⅳ ）-catalyzed ozonation

Efficiencies of ozonation for pretreatment of acetophenone, nitrobenzene and a landfill leachate （Quzhou, Zhejiang） in the presence of Ti（Ⅳ） and H2O2 were investigated under acid conditions. The results indica- ted that the COD removal rates of acetophenone, nitrobenzene and the landfill leachate were only 10.1%, 44% and 28.6% by ozone alone at pH 2.86, and their corresponding BOD5/COD ratios increased from 0.039, 0. 060 and 0.085 to 0. 130, 0. 158 and 0. 174, respectively. The ozonized-solutions still belong to refractory wastewater. However, When Ti （Ⅳ） was added to the solutions, the COD removal rates of acetophenone and nitrobeuzene significantly increased to 75.5% and 65% , and their corresponding BOD5/COD ratios also increased to 0.679 and 0. 314, respectively, indica- ting significant enhancements of biodegradability of both samples. The COD removal rate of the landfill leachate in- creased to 66.6% and its BODJCOD ratio to 0.425 only when both Ti（Ⅳ） and H2O2 were added to the wastewater. The above results are of high significance for the treatment of acid refractory wastewaters.