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首页> 外文期刊>The Science of the Total Environment >Ultraviolet absorbance monitoring for removal of DBP-precursor in waters with variable quality: Enhanced coagulation revisited
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Ultraviolet absorbance monitoring for removal of DBP-precursor in waters with variable quality: Enhanced coagulation revisited

机译：紫外吸光度监测，用于去除质量可变的水中的DBP前体：重新增强混凝

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Enhanced coagulation can be an effective way to reduce disinfection by-product (DBP) precursor concentrations. Where turbidity is not extremely high, the natural organic matter concentration evaluated by total or dissolved organic carbon concentration or UV absorbance is known to be the most important factor for determining the adequate coagulant dose. Yet treatment plant operators are often faced with difficult decisions when it comes to coagulant dosages: Should coagulation efforts and coagulant doses be consistent year-round when water quality changes seasonally? Should the coagulant dose be increased when DBP standards are not met, or has the maximum removal of DBP precursors been reached? The objective and novelty of this study is to revisit the concept of enhanced coagulation and to determine optimal coagulation guidelines based not just on the removal of common indicators such as DOC but on the removal of actual DBP precursors. Jar-tests (for DBP precursor removal evaluation) using alum were conducted under a range of conditions on 8 different natural/synthetic waters with varying physicochemical characteristics for subsequent chlorination over 48 h (for DBP formation potential). A coagulant-dose adjustment strategy based on UV254 monitoring was also implemented at a full-scale facility. Results show that for the wide range of waters tested, an alum/UV254 stoichiometric dose of 180 ± 25 mg alum cm/L represents a point of diminishing return (i.e. it maximises DBP precursor removal). Another original result of this work is that this dose is applicable and equally efficient in all seasons, despite changes in water quality. For utilities with similar raw waters, this means that coagulation efforts should be proportional to the UV254 of the raw water, regardless of the season.
机译：增强的凝结可能是降低消毒副产物（DBP）前体浓度的有效方法。在浊度不是很高的地方，已知通过总有机碳浓度或溶解的有机碳浓度或紫外线吸收率评估的天然有机物浓度是确定适当凝结剂剂量的最重要因素。然而，在涉及凝结剂剂量时，污水处理厂的经营者通常会面临艰难的决定：当水质季节性变化时，凝结剂的努力和凝结剂剂量是否应全年保持一致？当不符合DBP标准时，应该增加凝结剂剂量吗？或者是否已达到DBP前体的最大去除量？这项研究的目的和新颖性是重新审视增强混凝的概念，并不仅基于去除常见指标（例如DOC），而且基于去除实际DBP前体来确定最佳混凝指南。使用明矾在一系列条件下，对8种具有不同理化特性的天然/合成水进行了明矾的Jar测试（用于DBP前体去除评估），随后在48小时内进行了氯化（对于DBP形成潜力）。在大规模设施中还实施了基于UV254监测的凝血剂量调整策略。结果表明，对于测试的各种水，明矾/ UV254化学计量剂量为180±25毫克明矾cm / L代表着递减点（即，它最大程度地去除了DBP前体）。这项工作的另一个原始结果是，尽管水质发生了变化，但该剂量在所有季节均适用且等效。对于具有相似原水的公用设施，这意味着无论季节如何，混凝作用都应与原水的UV254成正比。

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