Comparison of four pre-oxidants coupled powdered activated carbon adsorption for odor compounds and algae removal: Kinetics, process optimization, and formation of disinfection byproducts.
Comparison of four pre-oxidants coupled powdered activated carbon adsorption for odor compounds and algae removal: Kinetics, process optimization, and formation of disinfection byproducts.
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DOI：
10.1016/j.scitotenv.2023.168920
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发表时间：
2023-11
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通讯作者：
Heng-Xuan Zhao;Shuang Zhang;Tian-Yang Zhang;Yi-Ping Zhu;Renjie Pan;Mengying Xu;Zheng-Xiong Zheng-Zheng-Xiong-Zheng-2149098385;Chen-Yan Hu;Yu-Lin Tang;Bin Xu
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作者：
Heng-Xuan Zhao;Shuang Zhang;Tian-Yang Zhang;Yi-Ping Zhu;Renjie Pan;Mengying Xu;Zheng-Xiong Zheng-Zheng-Xiong-Zheng-2149098385;Chen-Yan Hu;Yu-Lin Tang;Bin Xu
预氧化和粉末活性炭（PAC）通常用于去除饮用水中的藻类和异味。然而，氧化剂和PAC之间的相互作用对处理性能的影响却知之甚少。本研究系统研究了四种氧化剂（KMnO 4、NaClO、ClO 2和O3）与PAC的组合方案对铜绿微囊藻细胞的灭活以及对原水中四种常见气味物质（二乙硫醚（DEDS）、2，2 '-氧双（1氯丙烷）（DCIP）、2-甲基异冰片（2-MIB）和土臭素（GSM））的去除。O3对4种化合物的去除率最高，NaClO对细胞活力和叶绿素a（Chl-a）的灭活率最高。PAC对DEDS和DCIP的吸附符合Freundlich模型。当处理组合氧化/PAC，去除率的藻类细胞和恶臭物质低于（至少1.6倍）比在氧化或PAC吸附单独获得的去除率之和。在这4种氧化剂中，NaClO/PAC对恶臭物质（52%）和藻类（66%）的同步控制效率最高。延长投加时间间隔可提高去除率。与预氧化/后PAC工艺相比，预PAC/后PAC工艺对恶臭物质和藻细胞的去除效果相当，但显著抑制了消毒副产物（DBPs）的生成，尤其是C-DBPs（NaClO和ClO 2）、溴酸盐（O3）和氯酸盐/溴酸盐（ClO 2）的生成。本研究可为改善水源水氧化-PAC联合预处理工艺的现场运行提供参考。
Pre-oxidation and powdered activate carbon (PAC) are usually used to remove algae and odorants in drinking waterworks. However, the influence of interaction between oxidants and PAC on the treatment performance are scarcely known. This study systematically investigated the combination schemes of four oxidants (KMnO4, NaClO, ClO2, and O3) and PAC on the inactivation ofMicrocystis aeruginosacells and removal of four frequently detected odorants in raw water (diethyl disulfide (DEDS), 2,2′-oxybis(1chloropropane) (DCIP), 2-methylisoborneol (2-MIB) and geosmin (GSM)). O3showed highest pseudo-first-order removal rate for all four compounds and NaClO exhibited highest inactivation rates for the cell viability and Chlorophyll a (Chl-a). The Freundlich model fitted well for the adsorption of DEDS and DCIP by PAC. When treated by combined oxidation/PAC, the removal ratio of algae cells and odorants were lower (at least 1.6 times) than the sum of removal ratios obtained in oxidation or PAC adsorption alone. Among these four oxidants, the highest synchronous control efficiency of odorants (52 %) and algae (66 %) was achieved by NaClO/PAC. Prolonging the dosage time interval promoted the removal rates. The pre-PAC/post-oxidation processes possessed comparable efficiency for the removal of odorants and algae cells comparing with pre-oxidation/post-PAC process, but significantly inhibited formation of disinfection byproducts (DBPs), especially for the formation of C-DBPs (for NaClO and ClO2), bromate (for O3) and chlorate/chlorite (for ClO2). This study could provide a better understanding of improving in-situ operation of the combined pre-treatments of oxidation and PAC for source water.