Enhancing anaerobic digestion of sulphate wastewater by adding nano-zero valent iron

• Published in: Environmental technology Vol. 44; no. 26; pp. 3988 - 3996
• Main Authors: Liu, Jiacheng, Ding, Yongyu, Qiu, Wen, Cheng, Qunpeng, Xu, Chenxi, Fan, Guozhi, Song, Guangsen, Xiao, Bo
• Format: Journal Article
• Language: English; French
• Published: England Taylor & Francis 23.11.2023; Taylor & Francis Ltd
• Subjects: Acidification; Anaerobic digestion; biogas yield; Community structure; Iron; Methane; Methanogenic bacteria; methanogens; Microbiomes; Microorganisms; nano-zero valent iron; Sulfate reduction; Sulfates; sulphate wastewater; Wastewater; nano-zero valent iron; sulphate wastewater; biogas yield; methanogens; Anaerobic digestion
• ISSN: 0959-3330; 1479-487X
• DOI: 10.1080/09593330.2022.2077137

In this paper, the effects of nano-zero valent iron (nZVI) on anaerobic digestion of sulphate wastewater with different /COD ratios, including the COD removal rate, methane yield, intermediate products and the change of microbial community structure, were investigated. The results showed that nZVI could effectively enhance the treatment efficiency and methane yield. Compared with the control group without nZVI, the methane yield increased from 348.6833 to 1007.05 mL CH 4 /gCOD removal with 4 g nZVI loading at /COD = 0.1. nZVI could make electron flow from sulphate reduction to methane production, which increased methane yield even at high sulphate concentration. The microbial community analysis showed that adding nZVI could increase the abundance of acetoclastic methanogens, which accelerated hydrolysis acidification.