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Formation of disinfection by-products in the ultraviolet/chlorine advanced oxidation process

机译:在紫外线/氯气高级氧化过程中形成消毒副产物

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摘要

Disinfection by-product (DBP) formation may be a concern when applying ultraviolet light and free chlorine (UV/chlorine) as an advanced oxidation process (AOP) for drinking water treatment, due to typically large chlorine doses (e.g. 5-10 mg L~(-1) as free chlorine). A potential mitigating factor is the low chlorine contact times for this AOP treatment (e.g. seconds). Full-scale and pilot-scale test results showed minimal trihalomethane (THM) and haloacetic acid (HAA) formation during UV/chlorine treatment, while dichloroacetonitrile (DCAN) and bromochloroacetonitrile (BCAN) were produced rapidly. Adsorbable organic halide (AOX) formation was significant when applying the UV/chlorine process in water that had not been previously chlorinated, while little additional formation was observed in prechlorinated water. Chlorine photolysis led to chlorate and bromate formation, equivalent to approximately 2-17% and 0.01-0.05% of the photolyzed chlorine, respectively. No perchlorate or chlorite formation was observed. During simulated secondary disinfection of AOP-treated water, DBP formation potential for THMs, HAAs, HANs, and AOX was observed to increase approximately to the same extent as was observed for pretreatment using the more common AOP of UV combined with hydrogen peroxide (UV/H_2O_2).
机译:由于通常使用大剂量的氯(例如5-10 mg L),因此在将紫外线和游离氯(UV /氯)用作饮用水处理的高级氧化工艺(AOP)时,可能会产生消毒副产物(DBP)的问题。 〜(-1)为游离氯)。潜在的缓解因素是此AOP处理的低氯接触时间(例如秒)。全面和中试测试结果表明,在紫外线/氯气处理过程中,三卤甲烷(THM)和卤代乙酸(HAA)的形成极少,而二氯乙腈(DCAN)和溴氯乙腈(BCAN)的生成速度很快。在未经过氯化的水中进行UV /氯处理时,可吸附的有机卤化物(AOX)的形成非常重要,而在预氯化水中几乎没有观察到额外的形成。氯的光解导致氯酸盐和溴酸盐的形成,分别相当于光解氯的2-17%和0.01-0.05%。没有观察到高氯酸盐或亚氯酸盐的形成。在对AOP处理过的水进行模拟二次消毒期间,观察到THM,HAA,HAN和AOX的DBP形成潜力大约与使用更常见的UV与过氧化氢AOP组合进行预处理所观察到的程度增加相同。 H_2O_2)。

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