Xi Shihao, Dong Xinlei, Lin Qingshan, Li Xiang, Ma Jie, Zan Feixiang, Biswal Basanta Kumar, Awasthi Mukesh Kumar, Wang Zongping, Chen Guanghao, Guo Gang
School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), Key Laboratory of Water and Wastewater Treatment (HUST), MOHURD, Wuhan 430074, China.
School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), Key Laboratory of Water and Wastewater Treatment (HUST), MOHURD, Wuhan 430074, China; Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China.
Bioresour Technol. 2023 Jan;368:128364. doi: 10.1016/j.biortech.2022.128364. Epub 2022 Nov 21.
Electrochemical pretreatment (EPT) is an efficient technology to improve volatile fatty acids (VFAs) production during anaerobic fermentation of waste activated sludge (WAS). This study investigated the co-effects of different current intensities, electrolyte NaCl dosage and pretreatment time for promoting VFAs production. The results showed that it was considerably enhanced by 51.6 % when EPT was performed at 1.0 A, 1.0 g/L and 60 min, and response surface methodology strategy adjusted the optimal EPT conditions to 1.0 A, 1.2 g/L and 66 min. The potential mechanisms were proposed that EPT at optimal conditions greatly enhanced solubilization and hydrolysis of WAS and selectively inactivated methanogens, causing the enrichment of acidogenic bacteria (i.e., Lactobacillus, Saccharimonadales, Tetrasphaera and Prevotella) due to generated reactive chlorine species. Finally, the economic analysis indicated the promising application potential with the profit of EPT at optimal conditions increasing by 36.0 %.
电化学预处理(EPT)是一种在废弃活性污泥(WAS)厌氧发酵过程中提高挥发性脂肪酸(VFAs)产量的高效技术。本研究调查了不同电流强度、电解质NaCl用量和预处理时间对促进VFAs产生的协同作用。结果表明,在1.0 A、1.0 g/L和60分钟条件下进行EPT时,VFAs产量显著提高了51.6%,响应面法将最佳EPT条件调整为1.0 A、1.2 g/L和66分钟。提出了潜在机制,即在最佳条件下的EPT极大地增强了WAS的溶解和水解,并选择性地使产甲烷菌失活,由于产生的活性氯物种导致产酸菌(即乳酸杆菌、糖单胞菌目、四球藻属和普雷沃氏菌属)富集。最后,经济分析表明,最佳条件下EPT的利润增加了36.0%,具有广阔的应用潜力。