Zeng Yuanxin, Dong Wenyi, Wang Hongjie, Huang Xiao, Li Ji
School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, PR China.
School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, PR China; Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Shenzhen, 518055, PR China; State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China; Laboratory of Urban High Concentration Wastewater Treatment and Resource Utilization, Shenzhen, 518055, PR China.
Environ Res. 2023 Jan 15;217:114939. doi: 10.1016/j.envres.2022.114939. Epub 2022 Nov 24.
To obtain high-quality VFAs production from primary sludge, a novel strategy that combined peroxymonosulfate (PMS) pretreatment and alkaline fermentation (i.e., PMS & pH9) was proposed in the study. The results showed that PMS & pH9 was efficient in sludge solubilization and hydrolysis, resulting in a maximal VFAs yield of 401.2 mg COD/g VSS, which was 7.3-, 2.1-, and 8.8-fold higher than the sole PMS, sole pH9, and control, respectively. Acetate comprised 87.6% of VFAs in this integration system. Mechanism investigations revealed that sulfate and free radicals produced by PMS play roles in improving VFAs yield under alkaline conditions. Besides, sulfate also aided in C3∼C5 VFAs converting to acetate under alkaline conditions depending on the increase of incomplete-oxidative sulfate-reducing bacteria (iso-SRB) (i.e., Desulfobulbus and Desulfobotulus). Moreover, the relative abundances of acid-forming characteristic genera (i.e., Proteiniborus, Proteinilcasticum, and Acetoanaerobium) were higher in PMS & pH9.
为了从初沉污泥中获得高质量的挥发性脂肪酸（VFAs），本研究提出了一种结合过一硫酸盐（PMS）预处理和碱性发酵（即PMS & pH9）的新策略。结果表明，PMS & pH9在污泥溶解和水解方面效率很高，挥发性脂肪酸的最大产量为401.2 mg COD/g VSS，分别比单独的PMS、单独的pH9和对照高7.3倍、2.1倍和8.8倍。在这个整合系统中，乙酸占挥发性脂肪酸的87.6%。机理研究表明，PMS产生的硫酸根和自由基在碱性条件下对提高挥发性脂肪酸产量起作用。此外，硫酸根在碱性条件下还有助于C3∼C5挥发性脂肪酸转化为乙酸，这取决于不完全氧化型硫酸盐还原菌（iso-SRB）（即脱硫球菌属和脱硫小杆菌属）数量的增加。此外，在PMS & pH9条件下，产酸特征属（即嗜蛋白菌属、嗜蛋白分解菌属和厌氧乙酸菌属）的相对丰度更高。
