洞悉稻草灰提升高盐有机废水厌氧消化性能的作用。
Insight into the effect of rice-straw ash on enhancing the anaerobic digestion performance of high salinity organic wastewater.
机构信息
School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, China; Jiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, Jiangnan University, Wuxi, 214122, China.
School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, China; Jiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, Jiangnan University, Wuxi, 214122, China.
出版信息
Chemosphere. 2023 Nov;340:139920. doi: 10.1016/j.chemosphere.2023.139920. Epub 2023 Aug 21.
Anaerobic digestion is an economic method for treating high salinity organic wastewater (HSOW), but performance enhancement is needed because of the inhibitory effect of high salinity. In this study, rice-straw ash (RSA) was applied to alleviate the inhibitory effect during HSOW anaerobic digestion. The results showed that, when the NaCl content increased from 0% to 3.0%, the methane production decreased by 87.35%, and the TOC removal rate decreased to 34.12%. As a K and alkalinity source, RSA addition enhanced the anaerobic digestion performance, and the optimal dosage was 0.88 g/L. Under this dosage, the methane production increased by 221.60%, and TOC removal rate reached 66.42% at 3.0% salinity. The addition of RSA increased the proportion of living cells in the high salinity environment, and enhanced the activity of key enzymes and electron transfer efficiency in the anaerobic digestion process. The addition of RSA with a dosage of 0.88 g/L promoted the accumulation of acetoclastic methanogen Methanothrix. The abundance of substrate transporters, ion transporters and electron transfer related functional genes were enriched, which might be key for promoting HSOW anaerobic digestion performance. The results also showed that RSA addition played an important role in maintaining the stability of the anaerobic digestion system, and it could be a potential strategy for enhancing the anaerobic digestion performance under high salinity conditions.
厌氧消化是一种处理高盐有机废水（HSOW）的经济方法，但由于高盐度的抑制作用，需要增强其性能。在本研究中，稻草灰（RSA）被应用于缓解 HSOW 厌氧消化过程中的抑制作用。结果表明，当 NaCl 含量从 0%增加到 3.0%时，甲烷产量下降了 87.35%，TOC 去除率下降到 34.12%。作为 K 和碱度的来源，RSA 的添加增强了厌氧消化性能，最佳添加量为 0.88 g/L。在此剂量下，在 3.0%盐度下，甲烷产量增加了 221.60%，TOC 去除率达到 66.42%。RSA 的添加增加了高盐环境中活细胞的比例，并增强了厌氧消化过程中关键酶和电子传递效率的活性。添加 0.88 g/L 的 RSA 促进了产乙酰甲烷菌 Methanothrix 的积累。底物转运蛋白、离子转运蛋白和电子传递相关功能基因的丰度增加，这可能是促进 HSOW 厌氧消化性能的关键。结果还表明，RSA 的添加对维持厌氧消化系统的稳定性起着重要作用，它可能是增强高盐条件下厌氧消化性能的一种潜在策略。
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