Dong Feilong, Lin Qiufeng, Li Cong, Zhang Tuqiao
College of Civil Engineering and Architecture, Zhejiang University Hangzhou 310027 China.
School of Environment and Architecture, University of Shanghai for Science and Technology Shanghai 200433 China
RSC Adv. 2019 Dec 12;9(70):41022-41030. doi: 10.1039/c9ra06449d. eCollection 2019 Dec 9.
Blue-green algae commonly bloom in fresh water in summer, producing extra- and intra-cellular algal organic matters, which are important precursors for disinfection byproduct (DBP) formation. In this study, we evaluated the effect of pre-oxidation with ferrate(vi) (FeO , Fe(vi)) on the characterization of intracellular organic matter (IOM) and extracellular organic matter (EOM). The results indicated that soluble microbial-like products of EOM and IOM decreased and humic acid-like products of IOM increased, which would influence the DBP formation in the subsequent chlorination step. Therefore, in this study, the effect of Fe(vi) pre-oxidation on the DBP formation from IOM and EOM with subsequent chlorination was also investigated. For sp., EOM presented no significant change, and IOM presented a reduction of THMs (8.2%) after Fe(vi) oxidation at a dosage of 16 mg L. For , EOM and IOM both exhibited reduction of trihalomethanes (THMs) and chloral hydrate (CH) after Fe(vi) oxidation. Besides, THMs had the lowest concentration at pH 8.0 in all four solutions. Haloacetonitriles (HANs) and haloketones (HKs) showed slight changes with increasing pH values. Due to the frequent detection of bromide (Br) in surface water, the effect of bromide existence on THM formation was also investigated. The results indicated that all brominated DBPs increased, and chlorinated DBPs decreased with the increase in bromide concentration. In addition, the bromine substitution factor (BSF) of sp. and both increased with the increase in Br concentration.
蓝绿藻通常在夏季的淡水中大量繁殖，产生细胞外和细胞内的藻类有机物，这些有机物是消毒副产物（DBP）形成的重要前体物质。在本研究中，我们评估了高铁酸盐（FeO，Fe(Ⅵ)）预氧化对细胞内有机物（IOM）和细胞外有机物（EOM）特性的影响。结果表明，EOM和IOM的可溶性微生物类产物减少，IOM的腐殖酸类产物增加，这将影响后续氯化步骤中DBP的形成。因此，在本研究中，还研究了Fe(Ⅵ)预氧化对IOM和EOM后续氯化形成DBP的影响。对于 种，EOM没有显著变化，在16 mg/L的剂量下经Fe(Ⅵ)氧化后，IOM的三卤甲烷（THMs）减少了8.2%。对于 ，经Fe(Ⅵ)氧化后，EOM和IOM的三卤甲烷（THMs）和水合氯醛（CH）均有所减少。此外，在所有四种溶液中，pH值为8.0时THMs的浓度最低。卤乙腈（HANs）和卤代酮（HKs）随pH值升高变化较小。由于地表水中经常检测到溴化物（Br），因此还研究了溴化物的存在对THM形成的影响。结果表明，随着溴化物浓度的增加，所有溴化DBP均增加，而氯化DBP减少。此外， 种和 的溴取代因子（BSF）均随Br浓度的增加而增加。
