聚乙烯微塑料对污泥中高温厌氧消化的影响

甄昭淦; 苏阳; 罗竣潇; 安彤; 陈瑶; 苟敏

doi:10.13205/j.hjgc.202304012

聚乙烯微塑料对污泥中高温厌氧消化的影响

doi: 10.13205/j.hjgc.202304012

四川大学建筑与环境学院, 成都 610065

基金项目:

国家自然科学基金面上项目(52070135)

详细信息

作者简介:
甄昭淦,男,本科,主要研究方向为环境工程微生物。3170232953@qq.com

通讯作者:
苟敏,女,博士,博士生导师,主要研究方向为环境工程微生物。goumin@scu.edu.cn

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出版历程
- 收稿日期: 2022-05-26
- 网络出版日期: 2023-05-26
- 刊出日期: 2023-04-01

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

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

摘要

摘要: 城市污水中的微塑料被大量截留在污泥中,可能会影响后续的污泥厌氧消化过程,但已有的相关报道较少。以聚乙烯(PE)微塑料为研究对象,利用批次实验考察了不同浓度 PE 微塑料对污泥中温(37 ℃)和高温(55 ℃)厌氧消化体系性能的影响,定期测定产甲烷量、挥发性脂肪酸(VFAs)等理化指标,并用荧光法测定微生物的辅酶F₄₂₀活性。结果表明:中温条件下,PE微塑料对污泥厌氧消化性能无明显影响;高温条件下,PE微塑料对污泥厌氧消化具有明显的抑制作用。浓度为1,10,100 mg/L的PE微塑料,导致累计甲烷产量分别降低了3.81%、3.27%和9.72%;100 mg/L的PE微塑料使消化反应末期(第28 天)出现了丙酸累积[(400±19) mg/L];荧光观察结果表明,PE微塑料对高温体系的作用可能源于辅酶F₄₂₀活性下降,进而导致氢营养型产甲烷途径的抑制。因此,污泥的高温厌氧消化更容易受到PE微塑料的影响。
- 微塑料 /
- 聚乙烯 /
- 污泥 /
- 厌氧消化 /
- 氢营养型产甲烷途径
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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参考文献(13)

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