College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang, P.R. China.
College of Resources and Environmental Engineering, Guizhou University, Guiyang, Guizhou, P.R. China.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2020;55(9):1104-1110. doi: 10.1080/10934529.2020.1771958. Epub 2020 May 27.
Waste-activated sludge (WAS) with trace organic pollutants, e.g., polycyclic aromatic hydrocarbons (PAHs), has become an environmental concern. Anaerobic technology is a feasible option for WAS treatment due to its advantages of low-energy consumption and high-energy recovery compared to aerobic technology, but it still has many shortcomings, such as low biogas production and a low organic pollutant removal efficiency. Thus, this study investigated the effects of cellulose on PAHs degradation and microbial community structure variation during anaerobic digestion of sewage sludge. Four semicontinuous experiments were set by adding cellulose to sewage sludge based on the volatile solids (VS) concentration. The proportions of sludge VS to cellulose VS were 1:0 (CK), 1:0.2, 1:0.5 and 1:1. The results showed the following: (1) The biodegradation of 2-ring, 3-ring and 4-ring PAHs was enhanced by cellulose addition, with total PAHs removal efficiencies of 14.82%, 20.75% and 19.35%, respectively. (2) The abundance of bacteria that could degrade PAHs, such as , , , and , was obviously increased by cellulose addition. (3) The abundance of during sludge anaerobic digestion was apparently increased by cellulose addition. and appeared after cellulose addition, while they were not observed in the blank experiment.
污水厂剩余污泥（WAS）中含有痕量的有机污染物，如多环芳烃（PAHs），这引起了人们的环境关注。与好氧技术相比，厌氧技术具有能耗低、能量回收高等优点，是一种可行的 WAS 处理方法，但仍存在许多缺点，如沼气产量低、有机物去除效率低等。因此，本研究考察了纤维素对污水污泥厌氧消化过程中 PAHs 降解和微生物群落结构变化的影响。本研究基于挥发性固体（VS）浓度，通过向污水污泥中添加纤维素，设置了四个半连续实验。污泥 VS 与纤维素 VS 的比例分别为 1:0（CK）、1:0.2、1:0.5 和 1:1。结果表明：（1）纤维素的添加促进了 2-环、3-环和 4-环 PAHs 的生物降解，总 PAHs 的去除效率分别为 14.82%、20.75%和 19.35%。（2）纤维素的添加明显增加了能够降解 PAHs 的细菌的丰度，如 、 、 、 和 。（3）纤维素的添加明显增加了污泥厌氧消化过程中 菌的丰度。 菌和 菌在添加纤维素后出现，而在空白实验中未观察到。
