Enhancing anaerobic digestion and methane production of tetracycline wastewater in EGSB reactor with GAC/NZVI mediator

Water Research
Zhaohan ZhangYujie Feng

Abstract

Packing nano mediators into anaerobic system is an attractive technology to strengthen refractory pollutant removal and methane production from wastewater, but is limited by the drawbacks such as easy loss and poor mass transfer. In this study, GAC/NZVI mediator was added into EGSB reactor to investigate the enhancement effects and mechanism for anaerobic digestion of tetracycline wastewater and its impacts on microbial community structure. The results indicated that GAC/NZVI could enhance COD and TOC removal by 12.1% and 10.3%, while have no evident influence on tetracycline removal and sulfide production. The biogas production and methane content were increased by 21.2% and 26.9%, respectively. GAC/NZVI addition resulted in formation of densely packed aggregates, and evidently increased the electrical conductivity and EPS content in sludge. Fe content in sludge was 20.43% with the loss of only 5.4% during 34 d operation. Microbial community analysis revealed that GAC/NZVI addition could both increase the Chao 1 richness index and Shannon diversity index of bacteria and archaea. It was notable that total methanogens contents increased from 74.7% to 81.74% at genera level, resulting in higher methane production, while Treponema...Continue Reading

Citations

Feb 14, 2019·Environmental Science and Pollution Research International·Min ZhangYuncai Wang
Nov 25, 2020·Biodegradation·K J HidalgoDagoberto Y Okada
Nov 25, 2019·The Science of the Total Environment·Jun ZhouHaonan Zhang
Mar 20, 2021·The Science of the Total Environment·Zhiren CaoXiaoming Li
Oct 9, 2020·Bioresource Technology·Fengbo WangMiaomiao Du
May 12, 2021·Bioresource Technology·Yiwei LiuChunping Yang
Jul 2, 2021·Journal of Environmental Management·Hongying ChenXiang-Kun Li

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