Carbon- and metal-based mediators modulate anaerobic methanogenesis and phenol removal: Focusing on stimulatory and inhibitory mechanism

JOURNAL OF HAZARDOUS MATERIALS

卷:420

Article

Pan, Xiaofang^1,2,3  Lv, Nan^1,3,4  Cai, Guanjing¹  Zhou, Mingdian¹  Wang, Ruming¹  Li, Chunxing⁵  Ning, Jing¹  Li, Junjie¹  Li, Yanlin¹  Ye, Zhilong¹  Zhu, Gefu^2,3 

[1] Chinese Acad Sci, Inst Urban Environm, Key Lab Urban Pollutant Convers, Xiamen 361021, Peoples R China

[2] Renmin Univ China, Sch Environm & Nat Resources, Beijing 100872, Peoples R China

[3] Minist Agr & Rural Affairs, Key Lab Energy Resource Utilizat Agr Residue, Beijing, Peoples R China

[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[5] Tech Univ Denmark, Dept Environm Engn, DK-2800 Lyngby, Denmark

关键词: Phenol;    Redox mediator;    Methane production;    Adsorption kinetic;    Inhibitory mechanism;   

DOI  :  10.1016/j.jhazmat.2021.126615

来源: Elsevier

【 摘 要 】

In this study, anaerobic batch experiments were conducted to investigate the effect of carbon-based (biochar) and metal-based (nanoscale zero-valent iron, NZVI and zero valent iron, ZVI) mediators on the AD process treating phenolic wastewater. Fresh apricot shell- and wood-derived biochar (BiocharA, BiocharB) could remove the phenol efficiently (77.1% and 86.2%), suggesting that biodegradation cooperated with adsorption had advantage in phenol removal. BiocharB, NZVI and ZVI enhanced the methane production by 17.6%, 23.7% and 23.2%, respectively. Apart from serving as carrier for microbial growth, BiocharB might promote the direct interspecies electron transfer (DIET) since the Anaerolineaceae/Clostridium sensu stricto, which have potential for DIET, were enriched. NZVI and ZVI added systems mainly enhanced the abundance of Clostridium sensu stricto (24.5%, 37.6%) and Methanosaeta. Interestingly, BiocharA inhibited the methanogenesis completely. An inhibitory mechanism was proposed: the exposure of absorbed microbes on the BiocharA to the highly concentrated phenol in biochar' pores resulted in the inhibition of methanogens, especially for Methanosarcina. In conclusion, this study showed that suitable biochar (BiocharB) could serve as an alternative redox mediator for realizing simultaneously the efficient phenol removal and methane production.

【 授权许可】

Free