Effect of Influent Carbon-to-Nitrogen Ratios on the Production and Bioavailability of Microorganism-Derived Dissolved Organic Nitrogen (mDON) in Activated Sludge Systems,ACS ES&T Water

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Effect of Influent Carbon-to-Nitrogen Ratios on the Production and Bioavailability of Microorganism-Derived Dissolved Organic Nitrogen (mDON) in Activated Sludge Systems
ACS ES&T Water ( IF 4.8 ) Pub Date : 2021-07-30 , DOI: 10.1021/acsestwater.1c00122
Haidong Hu ₁ , Kewei Liao ₁ , Jinfeng Wang ₁ , Bing Wu ₁ , Hongqiang Ren ₁

Affiliation

The impact of the carbon-to-nitrogen (COD/N) ratio is typically a crucial factor in the operation of activated sludge systems; however, knowledge of its impact on effluent microorganism-derived dissolved organic nitrogen (mDON) is limited. This study investigated the effect of influent COD/N ratios (8, 5, and 3) on the production and bioavailability of mDON in effluents from sequencing batch reactors (SBRs). Significant differences were not observed between the mDON concentrations in effluents from SBRs operated at different COD/N ratios (p = 0.273–0.568, t-test). However, the molecular composition analysis showed that the mDON produced at low COD/N ratios (3 and 5) exhibits more lability than that produced at a COD/N ratio of 8. The results of an algal bioassay also showed that the mDON produced at low COD/N ratios is highly bioavailable to algae and microorganisms. Gray relational analysis revealed that Bacteroidetes and Actinobacteria (at the phylum level) and Microbacterium (genus level) had the most significant influence on mDON bioavailability. Above all, this study highlights the importance of controlling the mDON in effluents from SBRs operated at low influent COD/N ratios to reduce the potential impact of wastewater-derived nitrogen on receiving waters.

中文翻译：

进水碳氮比对活性污泥系统中微生物衍生的溶解有机氮 (mDON) 的产生和生物利用度的影响

碳氮 (COD/N) 比的影响通常是活性污泥系统运行中的关键因素；然而，关于其对流出物微生物来源的溶解有机氮 (mDON) 的影响的知识是有限的。本研究调查了进水 COD/N 比（8、5 和 3）对序批式反应器 (SBR) 流出物中 mDON 的产生和生物利用度的影响。在不同 COD/N 比率下运行的 SBR 流出物中的 mDON 浓度之间未观察到显着差异 ( p = 0.273–0.568, t-测试）。然而，分子组成分析表明，在低 COD/N 比（3 和 5）下产生的 mDON 比在 COD/N 比为 8 时产生的 mDON 表现出更大的不稳定性。藻类生物测定的结果还表明，在低 COD/N 比对藻类和微生物具有高生物利用度。灰色关联分析显示，拟杆菌和放线菌（在门水平）和微杆菌（属水平）对 mDON 生物利用度的影响最显着。最重要的是，这项研究强调了控制在低进水 COD/N 比下运行的 SBR 出水中的 mDON 的重要性，以减少废水衍生的氮对受纳水体的潜在影响。

更新日期：2021-09-10

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