EFFECT OF NZVI ON ANAEROBIC DIGESTION SYSTEM WITH LOW ORGANIC SLUDGE AND ITS MICROBIAL COMMUNITY DIVERSITY

WANG Qing-peng; YANG Zhao-hui; XU Rui; ZHANG Yan-ru; CAO Jiao

doi:10.13205/j.hjgc.202105005

Volume 39 Issue 5

Jan. 2022

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WANG Qing-peng, YANG Zhao-hui, XU Rui, ZHANG Yan-ru, CAO Jiao. EFFECT OF NZVI ON ANAEROBIC DIGESTION SYSTEM WITH LOW ORGANIC SLUDGE AND ITS MICROBIAL COMMUNITY DIVERSITY[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(5): 31-37,54. doi: 10.13205/j.hjgc.202105005

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WANG Qing-peng, YANG Zhao-hui, XU Rui, ZHANG Yan-ru, CAO Jiao. EFFECT OF NZVI ON ANAEROBIC DIGESTION SYSTEM WITH LOW ORGANIC SLUDGE AND ITS MICROBIAL COMMUNITY DIVERSITY[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(5): 31-37,54. doi: 10.13205/j.hjgc.202105005

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EFFECT OF NZVI ON ANAEROBIC DIGESTION SYSTEM WITH LOW ORGANIC SLUDGE AND ITS MICROBIAL COMMUNITY DIVERSITY

doi: 10.13205/j.hjgc.202105005

Key Laboratory of Environmental Biology and Pollution Control, College of Environmental Science and Engineering, Hunan University, Changsha 410082, China

Received Date: 2020-10-02
Available Online: 2022-01-17

Abstract

Abstract

In order to investigate the effects of nano-valent zero iron (NZVI) dosage on the reactor performance and microbial community diversity of mesophilic sludge anaerobic digester with low organic load, a series of lab-scale tests were carried out with four NZVI dosage of 0, 0.1, 0.3 and 0.5 g/g VS. Results showed that NZVI could promote methanogenesis in the early period, while with the accumulation of NZVI in the reactor, the methane production was gradually inhibited; and the higher the concentration of zero-valent iron, the stronger the inhibition. The addition of NZVI did not cause acidification or ammonia suppression. Noticeably, the anaerobic digestors had great stability and the removal rate of phosphate in supernatant could reach 97.78%. The addition of NZVI promoted the growth of hydrolytic acid-producing bacteria, such as Firmicutes, Proteobacteria, and the growth of hydrogenotrophic methanogens such as Methanosarcina, while it had inhibitory effect on the growth of Methanosaeta.
- low organic load sludge,
- nano-valent zero iron,
- anaerobic digestion,
- microbial community

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References(26)

References

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