Improving biodegradability of soil washing effluents using anodic oxidation
Improving biodegradability of soil washing effluents using anodic oxidation
复制标题
DOI：
10.1016/j.biortech.2017.12.060
复制
发表时间：
2018-03-01
影响因子：
11.4
通讯作者：
Jesus Fernandez-Morales, Francisco
中科院分区：
文献类型：
--
作者：
Belen Carboneras, Maria;Canizares, Pablo;Jesus Fernandez-Morales, Francisco
在这项工作中，电化学和生物技术相结合，提出了去除二氯吡啶酸从土壤冲洗废水（SWE）。首先，进行土壤洗涤以从土壤中提取二氯吡啶酸。在此之后，四种不同的阳极-铱-MMO，钌-MMO，pSi-BDD和碳毡（CF）-进行了评价，以提高SWE的生物降解性。选择CF是因为它是唯一一种能够将农药转化为更可生物降解的化合物而不完全矿化的化合物。最后，进行生物氧化试验以确定产生的SWE的好氧生物降解性。从所获得的结果中，观察到在电解开始时，毒性略微增加并且生物降解性降低。然而，对于超过2.5 A中心点h dm（-3）的电流充电的毒性急剧下降，显示143 mg L-1的E（C5）0，和BOD 5/COD比从0.02增加到0.23。
In this work, a combination of electrochemical and biological technologies is proposed to remove clopyralid from Soil Washing Effluents (SWE). Firstly, soil washing was carried out to extract clopyralid from soil. After that, four different anodes-Ir-MMO, Ru-MMO, pSi-BDD and Carbon Felt (CF)-were evaluated in order to increase the biodegradability of the SWE. CF was selected because was the only one able to transform the pesticide to a more biodegradable compounds without completely mineralizing it. Finally, biological oxidation tests were performed to determine the aerobic biodegradability of the SWE generated. From the obtained results, it was observed that at the beginning of the electrolysis the toxicity slightly increased and the biodegradability decreases. However, for electric current charges over 2.5 A center dot h dm(-3) the toxicity drastically decreased, showing an E(C5)0 of 143 mg L-1, and the BOD5/COD ratio increased from 0.02 to 0.23.