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用Fenton氧化处理合成制药企业活性污泥混合液,考察了不同Fe~(2+)、H_2O_2投加量和不同反应时间下污泥与上清液中AOX(可吸附有机卤代物)的去除效果,优化了反应条件,探讨了氧化机制.结果表明,Fenton氧化的最佳条件为H_2O_2投加量0.90 mol·L~(-1),Fe~(2+)投加量0.045 mol·L~(-1)[物质的量比为:n(Fe~(2+))∶n(H_2O_2)=1∶20],反应2 h,污泥和上清液中AOX可分别去除70.7%和78.5%.GC-MS分析结果显示,污泥中含有11种有机卤代物,Fenton氧化后有8种不再检出;3种仍有检出,但浓度有所降低,去除率约为40%~50%.与此同时,污泥中对二甲苯、邻苯二甲酸二异丁酯等非有机卤代物类有毒有害有机物也得到有效去除.
Fenton oxidation was used to treat the activated sludge mixed liquor in the pharmaceutical enterprises. The removal efficiency of AOX (adsorbable organic halogenated products) in the sludge and supernatant was investigated under different dosage of Fe 2 +, H 2 O 2 and different reaction time , The reaction conditions were optimized and the oxidation mechanism was discussed.The results showed that the optimal conditions for Fenton oxidation were 0.90 mol·L -1 H 2 O 2 and 0.045 mol·L -1 Fe 2+ 1) [molar ratio of the material: n (Fe 2 +): n (H 2 O 2) = 1:20], reaction time 2 h, AOX in sludge and supernatant can be removed by 70.7% and 78.5% The results of GC-MS analysis showed that there were 11 kinds of organic halides in the sludge, 8 kinds of which were not detected after Fenton oxidation and 3 kinds were still detected, but the concentration was reduced and the removal rate was about 40% -50 % At the same time, the sludge of paraxylene, diisobutyl phthalate and other non-organic halogenated toxic and harmful organic matter has also been effectively removed.