Disproportionate Changes in Composition and Molecular Size Spectra of Dissolved Organic Matter between Influent and Effluent from a Major Metropolitan Wastewater Treatment Plant.
Disproportionate Changes in Composition and Molecular Size Spectra of Dissolved Organic Matter between Influent and Effluent from a Major Metropolitan Wastewater Treatment Plant.
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大型城市污水处理厂进水和出水之间溶解有机物的成分和分子大小谱的不成比例的变化。
DOI：
10.1021/acsestwater.1c00391
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
and L. Guo
中科院分区：
文献类型：
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作者：
H. Lin;K. Matsui;R.J. Newton;and L. Guo
采用粒径分馏法、激发-发射矩阵法（EEM）、平行因子分析法（PARAFAC）和ΔEEM方法，对密尔沃基城市污水处理厂（WWTPs）进水和出水不同粒径馏分中溶解有机物（DOM）丰度、组成和粒径谱的动态变化进行了评价。DOC去除率达82.7%，总溶解氮（TDN）去除率达43.1%，发色性DOM （CDOM）去除率达52.4%，表明不同种类DOM的反应性/可降解性不同，去除率不成比例。在处理后的CDOM池中，芳香性指数和腐殖化指数均有所增加，而生物指数保持不变，表明原生DOM和蛋白质样成分被优先去除，导致出水中腐殖质样成分丰度较高，但DOM大小谱变化不大。0.22 μm滤液和0.7 μm滤液的DOM体积浓度差异达3%-5%。此外，0.22 ~ 0.7 μm粒径的DOM几乎只含有蛋白样成分，表现出高度的DOM异质性。高浓度的光化学和生物不稳定的DOM，具有较高的分子量和较低的DOC/TDN比，可能改变密歇根湖沿岸的微生物群落和生物地球化学过程。为了更好地了解DOM通过污水处理厂进入自然环境时的环境/生态作用，需要对出水和受水中的DOM进行长期和同时的表征。
Dynamic changes in the abundance, composition, and size spectra of dissolved organic matter (DOM) in different size-fractions between influent and effluent from Milwaukee metropolitan wastewater treatment plants (WWTPs) were evaluated using size-fractionation, excitation–emission matrix (EEM) coupled with parallel factor analysis (PARAFAC), and ΔEEM approaches. Up to 82.7% of DOC, 43.1% of total dissolved nitrogen (TDN), and 52.4% of chromophoric-DOM (CDOM) were removed from the influent, indicating different reactivity/degrability and disproportionate removal between DOM species. Within the CDOM pool, both the aromaticity and humification-index increased after treatments while the biological-index remained similar, showing a preferential removal of autochthonous DOM and the protein-like components, resulting in a higher abundance of humic-like components in the effluent but little change in the DOM size spectra. Up to 3%–5% differences were measured in the bulk DOM concentrations between the 0.22 and 0.7 μm filtrates. In addition, DOM in the 0.22–0.7 μm size-fraction contained almost only protein-like components, showing a high DOM heterogeneity. High levels of photochemically and biologically labile DOM in the effluent, with a higher molecular weight and lower DOC/TDN ratio, may alter the microbial community and biogeochemical processes in coastal Lake Michigan. Long-term and concurrent characterization of DOM in both effluent and receiving waters is needed to better understand the environmental/ecological roles of DOM as it moves through WWTPs and into the natural environment.