在上游废水处理过程中，出现了无意的、间接的废水再利用 工厂（WWTP）排放物影响下游饮用水处理厂。作为 评估废水对城市消毒副产物（DBP）形成的贡献的项目 在饮用水方面，其中一个目标是比较不同的污水处理厂工艺进行控制 废水中溶解有机碳和氮（DOC和DON）以及DBP前体的浓度 有机物（EfOM）。 硝化作用在决定EfOM质量方面起着关键作用 废水参数、天然有机物特性和DBP相关参数。一些 硝化作用强烈地改变了总凯氏氮（TKN）、氨（NH₃- N） ,， DON，含碳生化需氧量（CBOD），DOC，紫外线吸收率（UVA）， 以及化学需氧量。良好的硝化作用（NH₃-N<2 mg/L）增加了 TKN、NH₃-N和CBOD；降低可生物降解有机碳（BDOC）的浓度； 大幅改变了BDOC/DOC的比例。在一些废水处理过程中 颗粒物和DON转化为生物量、NH₃-N、亚硝酸盐、硝酸盐和/或氮气， 而DOC的一部分转化为生物量、二氧化碳、甲烷和/或 其他气体。虽然硝化作用降低了UVA的水平，但它导致 特异性UVA（SUVA）。这可能是由于优先去除吸收较少的紫外线 生物处理过程中DOC的（非腐殖酸）部分。 DOC和UVA的减少对应于卤乙酸的前体减少， 而去除DON会减少含氮DBP的前体（例如:。， 卤代乙腈，N-亚硝二甲胺）。然而，在中心趋势的基础上， 三卤甲烷前体相对不易分解。这些信息正被用来改善 了解污水处理厂水质改善对城市DBP前体负荷的影响 EfOM影响了饮用水供应。包括18个参考文献、表格、图表。

Unintentional, indirect wastewater reuse is occurring as upstream wastewater treatment plant (WWTP) discharges impact downstream drinking water treatment plants. As part of a project to evaluate the contribution of wastewater to disinfection byproduct (DBP) formation in drinking water, one of the objectives was to compare different WWTP processes for the control of dissolved organic carbon and nitrogen (DOC and DON), and DBP precursors in effluent organic matter (EfOM). Nitrification plays a key role in determining the quality of EfOM in terms of traditional wastewater parameters, natural organic matter character, and DBP-related parameters. Some nitrification strongly altered the levels of total Kjeldahl nitrogen (TKN), ammonia (NH₃-N), DON, carbonaceous biochemical oxygen demand (CBOD), DOC, ultraviolet absorbance (UVA), and chemical oxygen demand. Good nitrification (NH₃-N <2 mg/L) augmented the changes for TKN, NH₃-N, and CBOD; reduced the concentration of biodegradable organic carbon (BDOC); and dramatically changed the ratio of BDOC/DOC. During wastewater treatment, some of the particulate and DON was transformed to biomass, NH₃-N, nitrite, nitrate, and/or nitrogen gas, whereas a portion of the DOC was transformed to biomass, carbon dioxide, methane, and/or other gases. Although nitrification reduced the level of UVA, it resulted in an increase in specific UVA (SUVA). This was probably due to preferential removal of the less UV-absorbing (non- humic) portion of the DOC during biological treatment. A reduction in DOC and UVA corresponded to less precursors for haloacetic acids, whereas removal of DON resulted in less precursors for nitrogenous DBPs (e.g., haloacetonitriles, N-nitrosodimethylamine). However, on a central tendency basis, trihalomethane precursors were relatively recalcitrant. This information is being used to better understand the impact of improvements in WWTP water quality on DBP precursor loadings in EfOM-impacted drinking-water supplies. Includes 18 references, tables, figures.