Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Ultimo, NSW 2007, Australia.
Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Ultimo, NSW 2007, Australia.
Sci Total Environ. 2022 Dec 20;853:158684. doi: 10.1016/j.scitotenv.2022.158684. Epub 2022 Sep 10.
Methane production of waste activated sludge (WAS) in anaerobic digestion is hindered due to the rate-limited hydrolysis process and the low methane potential of WAS. Pretreatment of WAS is a common and appealing strategy to improve methane production in anaerobic digestion. In this study, we proposed to use urine, an easily obtained human waste with high ammonium concentration and pH, as a novel pretreatment strategy for anaerobic WAS digestion. Urine pretreatment at levels of 5-30 % (V/V) could substantially enhance methane production by 5-35 % in biochemical methane potential (BMP) tests, with the highest methane production of 179.6 ± 3.3 mL/g volatile solids (VS) achieved under the highest level of urine (i.e. 30 % urine addition). Based on the model analysis, the biochemical methane potential (B) and hydrolysis rate of WAS (k) rose from 131.9 mL/g VS and 0.19 d in the control without pretreatment to 136.3-178.2 mL/g VS and 0.22-0.30 d, respectively, after the urine pretreatment (5-30 % addition). Urine pretreatment with 5-30 % addition also improved the degradation extent (Y) of WAS by 3-35 %. The promising results indicate that urine pretreatment in anaerobic digestion is a promising technology to improve the efficiency of anaerobic digestion with environmental and economic benefits.
尿液预处理提高剩余污泥厌氧消化产甲烷性能
厌氧消化中，由于水解过程限速和剩余污泥（WAS）产甲烷潜力低，导致甲烷产量受到抑制。WAS 的预处理是提高厌氧消化中甲烷产量的常用且有吸引力的策略。在本研究中，我们提出使用尿液作为一种新型预处理策略，尿液是一种容易获得的高氨氮浓度和高 pH 值的人类废物。在生化甲烷潜力（BMP）测试中，尿液预处理 5-30%（V/V）可显著提高甲烷产量 5-35%，在最高尿液水平（即 30%尿液添加）下，甲烷产量最高可达 179.6±3.3 mL/g 挥发性固体（VS）。根据模型分析，在没有预处理的对照条件下，生化甲烷潜力（B）和 WAS 水解速率（k）分别从 131.9 mL/g VS 和 0.19 d 提高到 136.3-178.2 mL/g VS 和 0.22-0.30 d，经尿液预处理（5-30%添加）后。尿液预处理 5-30%添加还提高了 WAS 的降解程度（Y）3-35%。有前景的结果表明，尿液预处理在厌氧消化中是一种提高厌氧消化效率的有前途的技术，具有环境和经济效益。
