Response of anaerobic granular sludge to iron oxide nanoparticles and multi-wall carbon nanotubes during beet sugar industrial wastewater treatment

WATER RESEARCH

卷:117

Article

Ambuchi, John J.¹  Zhang, Zhaohan¹  Shan, Lili¹  Liang, Dandan¹  Zhang, Peng¹  Feng, Yujie¹ 

[1] Harbin Inst Technol, State Key Lab Urban Water Resource & Environm, 73 Huanghe Rd, Harbin 150090, Peoples R China

关键词: Anaerobic granular sludge;    Extracellular polymeric substance;    Iron oxide nanoparticle;    Multi-wall carbon nanotube;    Toxicity;   

DOI  :  10.1016/j.watres.2017.03.050

来源: Elsevier

【 摘 要 】

The accelerated use of iron oxide nanoparticles (IONPs) and multi-wall carbon nanotubes (MWCNTs) in the consumer and industrial sectors has triggered the need to understand their potential environmental impact. The response of anaerobic granular sludge (AGS) to IONPs and MWCNTs during the anaerobic digestion of beet sugar industrial wastewater (BSIW) was investigated in this study. The IONPs increased the biogas and subsequent CH4 production rates in comparison with MWCNTs and the control samples. This might be due to the utilization of IONPs and MWCNTs as conduits for electron transfer toward methanogens. The MWCNTs majorly enriched the bacterial growth, while IONP enrichment mostly benefitted the archaea population. Furthermore, scanning electron microscopy and confocal laser scanning microscopy revealed that AGS produced extracellular polymeric substances, which interacted with the IONPs and MWCNTs. This provided cell protection and prevented the nanoparticles from piercing through the membranes and thus cytotoxicity. The results provide useful information and insights on the adjustment of anaerobic microorganisms to the natural complex environment based on nanoparticles infiltration. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

Free