College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China; College of Environmental Science & Engineering, Beijing Forestry University, Beijing 100083, PR China.
Bioresour Technol. 2018 Jul;259:67-74. doi: 10.1016/j.biortech.2018.03.011. Epub 2018 Mar 6.
High sulfur content in excess sludge impacts the production of biomethane during anaerobic digestion, meanwhile leads to hydrogen sulfide (HS) formation in biogas. Effect of initial sludge pH on HS formation during batch mesophilic anaerobic digestion of slaughterhouse wastewater sludge was studied in this paper. The results demonstrated that when the initial sludge pH increased from 6.5 to 8.0, the biogas production increased by 10.1%, the methane production increased by 64.1%, while the HS content in biogas decreased by 44.7%. The higher initial sludge pH inhibited the competition of sulfate-reducing bacteria with methane-producing bacteria, and thus benefitted the growth of methanogens. Positive correlation was found between the relative abundance of Desulfomicrobium and HS production, as well as the relative abundance of Methanosarcina and methane production. More sulfates and organic sulfur were transferred to solid and liquid rather than HS formation at a high initial pH.
高含硫量的剩余污泥会影响厌氧消化过程中生物甲烷的生成，同时导致沼气中硫化氢（HS）的形成。本文研究了初始污泥 pH 值对屠宰废水污泥中温分批厌氧消化过程中 HS 形成的影响。结果表明，当初始污泥 pH 值从 6.5 增加到 8.0 时，沼气产量增加了 10.1%，甲烷产量增加了 64.1%，而沼气中的 HS 含量降低了 44.7%。较高的初始污泥 pH 值抑制了硫酸盐还原菌与产甲烷菌的竞争，从而有利于产甲烷菌的生长。HS 产量与脱硫微菌的相对丰度以及甲烷产量与产甲烷菌的相对丰度呈正相关。在较高的初始 pH 值下，更多的硫酸盐和有机硫被转移到固体和液体中，而不是形成 HS。
