Application of Fenton-like oxidation as pre-treatment for carbamazepine biodegradation
Application of Fenton-like oxidation as pre-treatment for carbamazepine biodegradation
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DOI：
10.1016/j.cej.2014.11.141
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发表时间：
2015-03
影响因子：
15.1
通讯作者：
V. Monsalvo;J. López;M. Munoz;Z. Pedro;J. Casas;Á. F. Mohedano;J. J. Rodriguez-J.
中科院分区：
文献类型：
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作者：
V. Monsalvo;J. López;M. Munoz;Z. Pedro;J. Casas;Á. F. Mohedano;J. J. Rodriguez-J.
在很低的催化剂浓度(L−1，Fe3+2 mg)下，考察了过氧化氢用量和温度对卡马西平类芬顿氧化降解的影响。类Fenton氧化可以使CBZ完全转化，氧化速度取决于过氧化氢的用量。加入理论化学计量比的H_2O_2，可使CBZ在1小时内完全转化。当H2O2初始浓度降至化学计量比的10%时，其矿化时间显著延长至3h。提高温度(35℃和50℃时，分别从21~131 mg·TOC/g·H_2O_2)显著提高了H_2O_2的矿化效率。在50℃以后，尽管反应的速度明显加快，但在反应的延长方面没有观察到明显的影响。利用未驯化的活性污泥进行呼吸测试，评价了类Fenton氧化出水的毒性和可生化性。卡马西平强烈抑制基本上不可生物降解的微生物活性(EC_(50)=21.8 mg/L−1)。CBZ(10 mg/L−1)在50℃下进行芬顿式氧化，达到完全矿化的理论化学计量比H_2O_2(5.6 mg·H_2O_2/mg·CBZ)，可获得易于生物降解的出水。
Degradation of carbamazepine (CBZ) upon Fenton-like oxidation has been investigated analyzing the effect of H2O2dose and temperature at a very low catalyst concentration (2 mg L−1of Fe3+). Fenton-like oxidation allowed complete conversion of CBZ, the oxidation rate depending on the amount of H2O2used. The addition of the theoretical stoichiometric amount of H2O2led to the complete conversion of CBZ in 1 h reaction time. The reduction of the H2O2initial concentration down to 10% of the stoichiometric led to a significant increase of that time up to 3 h. The mineralization efficiency of H2O2was considerably increased by increasing the temperature (from 21 to 131 mg TOC/g H2O2at 35 and 50 °C, respectively). Beyond 50 °C no significant effect was observed in the extension of reaction although it proceeded at significantly higher rate. The toxicity and biodegradability of the resulting effluents from Fenton-like oxidation were evaluated by respirometric tests using non-acclimated activated sludge. CBZ strongly inhibits the microbial activity (EC50= 1.8 mg L−1) being essentially non-biodegradable. Fenton-like oxidation of CBZ (10 mg L−1) at 50 °C with the theoretical stoichiometric H2O2amount for complete mineralization (5.6 mg H2O2/mg CBZ) allowed obtaining an easily biodegradable effluent.