EFFECTS OF POLYETHYLENE MICROPLASTICS ON MESOPHILIC AND THERMOPHILIC ANAEROBIC DIGESTION OF SLUDGE

ZHEN Zhaogan; SU Yang; LUO Junxiao; AN Tong; CHEN Yao; GOU Min

doi:10.13205/j.hjgc.202304012

Volume 41 Issue 4

Apr. 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(4): 86-91,130

ZHEN Zhaogan, SU Yang, LUO Junxiao, AN Tong, CHEN Yao, GOU Min. EFFECTS OF POLYETHYLENE MICROPLASTICS ON MESOPHILIC AND THERMOPHILIC ANAEROBIC DIGESTION OF SLUDGE[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(4): 86-91,130. doi: 10.13205/j.hjgc.202304012

Citation:

ZHEN Zhaogan, SU Yang, LUO Junxiao, AN Tong, CHEN Yao, GOU Min. EFFECTS OF POLYETHYLENE MICROPLASTICS ON MESOPHILIC AND THERMOPHILIC ANAEROBIC DIGESTION OF SLUDGE[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(4): 86-91,130. doi: 10.13205/j.hjgc.202304012

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EFFECTS OF POLYETHYLENE MICROPLASTICS ON MESOPHILIC AND THERMOPHILIC ANAEROBIC DIGESTION OF SLUDGE

doi: 10.13205/j.hjgc.202304012

College of Architecture and Environment, Sichuan University, Chengdu 610065, China

Received Date: 2022-05-26
Available Online: 2023-05-26
Publish Date: 2023-04-01

Abstract

Abstract

A large number of microplastics (MPs) in urban sewage are trapped in the sludge, which may affect the subsequent anaerobic digestion of sludge. In this study, polyethylene (PE) MPs with different concentrations were used to investigate their effects on the performance of mesophilic (37 ℃) and thermophilic (55 ℃) anaerobic digestion of sludge using batch test. Physical and chemical indicators including gas production and volatile fatty acids (VFAs) were quantitatively monitored. The coenzyme F₄₂₀ activity of microorganisms was evaluated by fluorescence observation. The results showed that PE MPs have no significant effect on the mesophilic anaerobic digestion of sludge, while they have obvious inhibitory effect on thermophilic anaerobic digestion of sludge. For the thermophilic system, when the addition of PE MPs was 1 mg/L, 10 mg/L and 100 mg/L, the cumulative production of CH₄ decreased by 3.81%, 3.27% and 9.72%, respectively; 100 mg/L PE MPs caused the accumulation of propionic acid [(400±19) mg/L] at the end of the reaction (the 28th day). According to the fluorescence results, the effect of PE microplastics on the thermophilic system may be caused by the decrease of coenzyme F₄₂₀ activity which leads to the inhibition of the hydrogenotrophic methanogenesis pathway. Therefore, thermophilic anaerobic digestion is more easily affected by PE MPs in the sludge.
- microplastics,
- polyethylene,
- sludge,
- anaerobic digestion,
- hydrogenotrophic methanogenesis pathway

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References(13)

References

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