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Photo-Fenton pretreatment of carbofuran - Analyses via experimental design, detoxification and biodegradability enhancement

机译：碳呋喃的光芬顿预处理-通过实验设计，排毒和生物降解性增强进行分析

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摘要

The central composite design (CCD) and response surface methodology (RSM) were employed to evaluate the effect of H2O2 dosage rate (1-10 mg L~(-1) min~(-1)) and Fe~(3+) dosage (1-100 mgL~(-1)) in the photo-Fenton treatment of carbofuran and to develop the second-order polynomial equations in terms of carbofuran and dissolved organic carbon (DOC) removals and BOD5/DOC ratio with different reaction times. Both H2O2 dosage rate and Fe~(3+) dosage have significant effects on the dependable variables. Based on the results of carbofuran removal and BOD5/DOC ratio, H2O2 dosage rate of 5.4 mg L~(-1) min~(-1) and Fe~(3+) dosage of 59 mg L~(-1) were found to be the favorable reagent dosages for carbofuran degradation. Under these conditions, the toxicity unit measured by Microtox~R test with 5 min exposure was decreased from 47 to 6 and the biodegradability evaluated by BOD5/COD ratio was increased from 0 to 0.76 after 60 min reaction. The results obtained in this study demonstrate that the photo-Fenton process is a promising pretreatment before the application of biological treatment for carbofuran removal from contaminated water/wastewater.
机译：采用中央复合设计（CCD）和响应面方法（RSM）评估H2O2剂量率（1-10 mg L〜（-1）min〜（-1））和Fe〜（3+）剂量的影响（1-100 mgL〜（-1））在光芬顿处理中对呋喃呋喃进行处理，并根据不同反应时间的呋喃呋喃和溶解有机碳（DOC）去除量以及BOD5 / DOC比，建立了二阶多项式方程。 H2O2的添加量和Fe〜（3+）的添加量对变量影响很大。根据除掉呋喃丹和BOD5 / DOC比的结果，发现H2O2的剂量率为5.4 mg L〜（-1）min〜（-1），Fe〜（3+）的剂量为59 mg L〜（-1）。成为呋喃丹降解的有利试剂。在这些条件下，反应60分钟后，用Microtox〜R试验测定的暴露5分钟的毒性单位从47降低到6，通过BOD5 / COD比评估的生物降解性从0增加到0.76。这项研究中获得的结果表明，光芬顿法是一种有前途的预处理方法，该方法在应用生物处理方法去除污染水/废水中的呋喃呋喃之前是一种很有前途的预处理方法。

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