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首页> 外文期刊>The Science of the Total Environment >Bioavailability and characterization of dissolved organic nitrogen and dissolved organic phosphorus in wastewater effluents
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Bioavailability and characterization of dissolved organic nitrogen and dissolved organic phosphorus in wastewater effluents

机译：废水中溶解性有机氮和溶解性有机磷的生物利用度和表征

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There is still a great knowledge gap in the understanding of characteristics and bioavailability of dissolved organic nitrogen (DON) and dissolved organic phosphorus (DOP) in wastewater effluents, which surmise implications related to both discharge regulation and treatment practice. In this study, we simultaneously investigated the characteristics and bioavailability of both DON and DOP, with separated hydrophilic versus hydrophobic fractions, in highly-treated wastewater effluents for the first time. The tertiary effluents from two wastewater treatment plants were separated into two fractions by XAD-8 resin coupled with anion exchange resin based on the hydrophobicity. Results showed that the majority of DON was present in hydrophilic forms while more DOP existed in hydrophobic forms. Hydrophilic DON contributed to 64.0%-72.2% of whole DON, while hydrophobic DOP accounted for 61.4%-80.7% of total DOP for the two plants evaluated. The effluents and their fractions were then subject to bioavailability assay based on 14-day algae growth. The results indicated that majority (～73-75%) of the effluent DOP, particularly the hydrophobic fraction with lower C/P ratio was more likely to be bioavailable for algal growth. The bioavailable fraction of DON varied widely (28%-61%) for the two plants studied and the hydrophilic fraction with lower C/N ratio seemed to exhibit higher bioavailability than the hydro-phobic portion. The differences in bioavailable DON and DOP distributions of effluents from those two plants could be attributed to different receiving effluent compositions and wastewater treatment processes. In addition, fluorescence excitation-emission matrices (EEMs) combined with parallel factor analysis (PARAFAC) were used to characterize the dissolved organic matter (DOM) in wastewater effluent, which provided insights into the nature of organic matter in wastewater samples with different characteristics and originating sources.
机译：在了解废水中溶解性有机氮（DON）和溶解性有机磷（DOP）的特性和生物利用度方面，仍然存在很大的知识差距，这推测与排放调节和处理实践有关。在这项研究中，我们同时研究了DON和DOP的特性和生物利用度，这是首次在经过高度处理的废水中分离出亲水部分和疏水部分。通过XAD-8树脂和基于阴离子疏水性的阴离子交换树脂，将来自两个废水处理厂的第三级废水分为两部分。结果表明，大多数DON以亲水形式存在，而更多的DOP以疏水形式存在。亲水性DON占全部DON的64.0％-72.2％，而疏水性DOP占被评估的两座工厂总DOP的61.4％-80.7％。然后根据14天的藻类生长情况对废水及其馏分进行生物利用度测定。结果表明，出水DOP的大部分（〜73-75％），尤其是具有较低C / P比的疏水级分更有可能被藻类生物利用。对于所研究的两种植物，DON的生物利用度分数相差很大（28％-61％），并且具有较低C / N比的亲水性分数似乎表现出比疏水部分更高的生物利用度。这两家工厂的废水中生物利用度DON和DOP分布的差异可能归因于不同的接收废水成分和废水处理过程。此外，荧光激发-发射矩阵（EEM）与并行因子分析（PARAFAC）结合用于表征废水中的溶解性有机物（DOM），从而提供了对具有不同特性和特性的废水样品中有机物性质的见解。原始来源。

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