A novel strategy for improving ammonia resistance of acidogenesis using domesticated sludge combined with nZVI addition in an ambient anaerobic digestion system

作者：Zunjing Lv, Xiaofang Pan, Zhi‐Long Ye, Donghua Xie, Guanjing Cai, Nan Lv, Yanlin Li · 发表于：Water Research · 年份：2024 · DOI：10.1016/j.watres.2024.122619 · 被引用次数：12 · 研究领域：Anaerobic Digestion and Biogas Production、Wastewater Treatment and Nitrogen Removal

High ammonia stress, which inhibited the performance and stability of anaerobic digestion (AD) systems, is considered a bottleneck problem. To improve the performance of ambient acidogenic AD system under high ammonia stress, three different strategies were developed, including native sludge with nano zero valent iron (nZVI) addition (S nZVI ), domesticated sludge enriched with homoacetogens with no additive (S Domesticated ) and domesticated sludge with nZVI addition (S Domesticated+nZVI ). All groups were operated at ambient temperature (24 ± 1 °C). Results showed that ammonia stress restricted the acidogenic rate in ambient acidogenic system significantly. Under ammonia stress, both S Domesticated and S Domesticated+nZVI showed positive impact on acidogenesis to resist, while the nZVI solely of S nZVI couldn't relieve the ammonia stress effectively. Compared to nZVI or domesticated sludge solely added system, S Domesticated+nZVI showed highest acidogenic rate under high ammonia stress. The S Domesticated treatment increased acetic acid and ethanol production under high ammonia stress compared to the S Control . The S Domesticated+nZVI further increased the production of formic acid and H 2 and reduced the generation of CO 2 . Microbial community analysis indicated that the relative abundances of main acidogens Bifidobacterium, Solobacterium and ethanol producing bacteria Ethanoligenens , increased in the S Domesticated and S Domesticated+nZVI groups. Moreover, S Domesticat...