Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510275, China.
Hebei Environmental Monitoring Center, Shijiazhuang, 050011, China.
Chemosphere. 2019 Jul;226:123-131. doi: 10.1016/j.chemosphere.2019.03.102. Epub 2019 Mar 22.
This work investigated the feasibility and mechanisms of solar/chlorine process in the removal of a kind of emerging contaminants, lipid regulators (gemfibrozil (GFRZ), benzafibrate (BZF), and clofibric acid (CA)), in simulated and real waters. These lipid regulators could be effectively removed by solar/chlorine treatment, and their corresponding pseudo-first-order rate constants (k') increased with increasing chlorine dosage. The degradation of GFRZ and BZF was primarily ascribed to reactive chlorine species (RCS) and ozone, while that of CA was mainly attributable to hydroxyl radical (HO) and ozone. As pH rose from 5.0 to 8.4, k' of GFRZ and BZF increased, while k' decreased. However, k' of GFRZ increased by 130%, while that of BZF decreased by 43.3%. These changes resulted in slight changes in the overall k's with increasing pH. k's of GFRZ, BZF, and CA by solar/chorine treatment were inhibited by natural organic matter (NOM) while the presence of bromide enhanced the degradation of GFRZ by solar/chlorine process. The degradation of lipid regulators was still effective in a secondary wastewater effluent sample and a sand-filtered water sample, although that was inhibited due to the dissolve organic matter (DOM) contained in real waters. The acute toxicity during the degradation of GFRZ by solar/chlorine treatment was comparable to that by treatment with chlorine alone. This study demonstrated that RCS played an important role in the degradation of micropollutants by the solar/chlorine treatment and the feasibility of solar/chlorine process in the application for the degradation of organic compounds in real waters.
本研究考察了太阳能/氯工艺在去除一种新兴污染物——脂调节剂（吉非罗齐（GFRZ）、苯扎贝特（BZF）和氯贝酸（CA））方面的可行性和机制，包括模拟水样和实际水样。结果表明，太阳能/氯工艺能有效去除这些脂调节剂，且其相应的准一级速率常数（k'）随氯投加量的增加而增大。GFRZ 和 BZF 的降解主要归因于活性氯物种（RCS）和臭氧，而 CA 的降解主要归因于羟基自由基（HO）和臭氧。随着 pH 值从 5.0 升高到 8.4，GFRZ 和 BZF 的 k'增大，而 CA 的 k'降低。然而，GFRZ 的 k'增加了 130%，而 BZF 的 k'降低了 43.3%。这些变化导致随着 pH 值的升高，整体 k'略有变化。太阳能/氯工艺处理 GFRZ、BZF 和 CA 的 k'受到天然有机物（NOM）的抑制，而溴化物的存在增强了太阳能/氯工艺对 GFRZ 的降解。尽管由于实际水样中所含的溶解有机物（DOM），脂调节剂的降解受到抑制，但在二级废水出水样和砂滤水样中，太阳能/氯处理仍能有效去除。太阳能/氯处理过程中 GFRZ 降解的急性毒性与单独用氯处理时相当。本研究表明，RCS 在太阳能/氯处理过程中对微污染物的降解起着重要作用，太阳能/氯工艺在实际水样中降解有机化合物方面具有可行性。
