Strategic Water Infrastructure Lab, School of Civil, Mining and Environmental Engineering, University of Wollongong, Australia.
School of Civil and Environmental Engineering, University of New South Wales, NSW 2052, Australia.
Bioresour Technol. 2017 Sep;240:197-206. doi: 10.1016/j.biortech.2017.02.020. Epub 2017 Feb 8.
The aim of this work was to study the fate of trace organic contaminants (TrOCs) in sewage sludge during recuperative thickening anaerobic digestion. Sludge shearing at 3142s for 5minutes improved biogas production. By contrast, shearing at ≥6283s for 5minutes caused a notable reduction in biogas production and the removal of volatile solids. Results reported here showed the prevalent occurrence of 17 TrOCs in sewage sludge and highlights the importance of assessing TrOC removal via mass balance calculation by taking into account partitioning between the aqueous and solid phase as well as biodegradation. Hydrophilic and readily-biodegradable TrOCs (caffeine, trimethoprim, and paracetamol) were well removed and were not affected by shearing. TrOCs such as carbamazepine, gemfibrozil, and diuron showed biodegradation only at high shearing. It is possible that shearing can facilitate the circulation of TrOCs between aqueous and solid phases, thus, enhancing the biodegradation of some TrOCs.
本研究旨在探讨回收式增稠厌氧消化过程中痕量有机污染物（TrOCs）在污泥中的归宿。3142 秒的污泥剪切 5 分钟可提高沼气产量。相比之下，≥6283 秒的剪切 5 分钟会显著降低沼气产量和挥发性固体的去除率。本研究结果表明，17 种 TrOCs 在污水污泥中普遍存在，这突出表明通过质量平衡计算评估 TrOC 去除的重要性，同时考虑到水相和固相间的分配以及生物降解。亲水性和易生物降解的 TrOCs（咖啡因、甲氧苄啶和扑热息痛）去除效果良好，不受剪切影响。卡马西平、吉非贝齐和敌草隆等 TrOCs 仅在高剪切条件下表现出生物降解。可能是剪切可以促进 TrOCs 在水相和固相间的循环，从而增强一些 TrOCs 的生物降解。
