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首页> 外文期刊>Waste Management >Fate of sterols, polycyclic aromatic hydrocarbons, Pharmaceuticals, ammonia and solids in single-stage anaerobic and sequential anaerobic/aerobic/anoxic sludge digestion
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Fate of sterols, polycyclic aromatic hydrocarbons, Pharmaceuticals, ammonia and solids in single-stage anaerobic and sequential anaerobic/aerobic/anoxic sludge digestion

机译：单级厌氧和连续厌氧/好氧/缺氧污泥消化中的固醇，多环芳烃，药物，氨和固体的命运

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摘要

Emerging contaminants (ECs), such as pharmaceuticals, sterols and polycyclic aromatic hydrocarbons (PAHs) are frequently detected in the environment. ECs are refractory, toxic, tend to bioaccumulate and have a potential to disrupt the endocrine system of living organisms. These compounds are only partially eliminated in wastewater treatment plants (WWTPs). Due to their hydrophobic nature, they tend to accumulate in sludge. However, the fate of the majority of ECs in sludge treatment processes is not fully understood. In this study, the effect of a sequential anaerobic/aerobic/anoxic (AN/AERO/ANOX) digestion and a conventional single-stage AN digestion (as control) was investigated on mixed primary and secondary sludge. Digesters were operated at an overall solid retention time (SRT) of 18 days. The steady-state results have shown that sequential AN/AERO/ANOX digestion configurations improved the removal of three classes of ECs (e.g., sterols, PAHs and pharmaceuticals) by either reducing their accumulation or enhancing their removal. Moreover, sequential AN/AERO/ANOX digestion also achieved 45% less ammonia generation, 20% faster digestate dewaterability and 4% enhanced volatile solids removal compared to single-stage AN digestion. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在环境中经常检测到新兴污染物（EC），例如药品，固醇和多环芳烃（PAH）。 EC具有难治性，毒性，易于生物蓄积，并且有可能破坏活生物体的内分泌系统。这些化合物仅在废水处理厂（WWTP）中被部分消除。由于它们的疏水性，它们倾向于积聚在污泥中。但是，对大多数EC在污泥处理过程中的命运还没有完全了解。在这项研究中，研究了厌氧/好氧/厌氧顺序消化（AN / AERO / ANOX）和常规单级AN消化（作为对照）对混合的一级和二级污泥的影响。消化器的总固体保留时间（SRT）为18天。稳态结果表明，顺序的AN / AERO / ANOX消化配置可通过减少三类EC（例如，固醇，PAH和药物）的积累或提高其去除率来改善去除效果。此外，相较于单阶段AN消化，连续的AN / AERO / ANOX消化还减少了45％的氨生成，消化脱水率提高了20％，挥发性固体去除率提高了4％。 （C）2019 Elsevier Ltd.保留所有权利。

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