Beyond Energy Balance: Environmental Trade-Offs of Organics Capture and Low Carbon-to-Nitrogen Ratio Sewage Treatment Systems.,Environmental Science & Technology

当前位置： X-MOL 学术 › Environ. Sci. Technol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Beyond Energy Balance: Environmental Trade-Offs of Organics Capture and Low Carbon-to-Nitrogen Ratio Sewage Treatment Systems.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-03-30 , DOI: 10.1021/acs.est.9b05755
Valeria I Alvarado ₁ , Shu-Chien Hsu ₁ , Chor-Man Lam ₁ , Po-Heng Lee ₂

Affiliation

Several life-cycle assessments (LCAs) have evaluated the environmental impacts (EIs) of different wastewater treatment (WWT) configurations, attempting resource recovery and energy efficiency. However, a plant-wide LCA considering up-concentration primary treatment and low carbon-to-nitrogen (C/N) ratio sewage at the secondary biological treatment (SBT) has not yet been conducted. This study identifies the environmental trade-offs and hotspots for the chemically enhanced primary treatment (CEPT) and low C/N ratio SBT emerging processes compared to conventional WWT. The life-cycle inventories were calculated using a stoichiometric life-cycle inventory framework that couples stoichiometry and kinetics to obtain site-specific water, air, and soil emissions. The midpoint results of LCA show that CEPT with anaerobic digestion (AD) for sludge treatment achieves energy self-sufficiency, but increases marine eutrophication (MEu) by 1 order of magnitude compared to conventional WWT. A mainstream anaerobic fluidized-bed bioreactor and a partial nitritation-anammox fluidized-bed membrane bioreactor which can reduce all environmental impacts by 17-47%, including MEu, are proposed as the SBT of the low-carbon CEPT settled sewage. Integrating the standardized S-LCI framework resulted in a site-specific LCA that aids decision-makers on choosing between higher reductions in most EIs at the expense of high MEu or less but consistent reductions in all EI categories.

中文翻译：

超越能量平衡：有机物捕获和低碳氮比污水处理系统的环境权衡。

几个生命周期评估（LCA）评估了不同废水处理（WWT）配置对环境的影响（EI），试图进行资源回收和能源效率。但是，尚未进行考虑全浓度一级处理和二级生物处理（SBT）时低碳氮比（C / N）污水的全厂LCA。这项研究确定了与常规WWT相比，化学增强一级处理（CEPT）和低C / N比SBT新兴工艺在环境上的取舍和热点。使用化学计量的生命周期清单框架计算生命周期清单，该框架将化学计量和动力学耦合起来以获得特定地点的水，空气和土壤排放。LCA的中点结果表明，采用厌氧消化（AD）进行污泥处理的CEPT实现了能量自给，但与常规WWT相比，海洋富营养化（MEu）增加了1个数量级。提出了一种主流的厌氧流化床生物反应器和部分亚硝化-厌氧流化床膜生物反应器，可以将包括MEu在内的所有环境影响降低17-47％，作为低碳CEPT沉降污水的SBT。整合标准化的S-LCI框架，形成了针对特定地点的LCA，它可以帮助决策者在大多数EI的更高减排量之间进行选择，而代价却是所有EI类别的MEu值不高或更低，但始终如一。提出了一种主流的厌氧流化床生物反应器和部分亚硝化-厌氧流化床膜生物反应器，可以将包括MEu在内的所有环境影响降低17-47％，作为低碳CEPT沉降污水的SBT。整合标准化的S-LCI框架，形成了针对特定地点的LCA，它可以帮助决策者在大多数EI的更高减排量之间进行选择，而代价却是所有EI类别的MEu值不高或更低但始终如一。提出了一种主流的厌氧流化床生物反应器和部分亚硝化-厌氧流化床膜生物反应器，可以将包括MEu在内的所有环境影响降低17-47％，作为低碳CEPT沉降污水的SBT。整合标准化的S-LCI框架，形成了针对特定地点的LCA，它可以帮助决策者在大多数EI的更高减排量之间进行选择，而代价却是所有EI类别的MEu值不高或更低，但始终如一。

更新日期：2020-04-23

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11