Trace concentrations of graphene oxide and magnetic graphene oxide rescue anaerobic municipal sludge digesters under stress

IF 9.7 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology Pub Date : 2025-02-01 DOI:10.1016/j.biortech.2024.131936

Milad Goodarzi , Mohammad Arjmand , Cigdem Eskicioglu

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Abstract

This study evaluated long-term performance of graphene oxide (GO) and magnetic GO (MGO) nanosheets in semi-continuous-flow anaerobic digestion (AD) of municipal sludge over 230 days. At organic loading rates (OLRs) of 2.6 and 3.4 g chemical oxygen demand (COD)_fed/L/day, 20 and 200 mg/L of GO and MGO did not affect AD performance. However, at an OLR of 5.2 g COD_fed/L/day, where control digesters failed, 20 and 200 mg/L of GO and MGO sustained biogas yields at 190 mL/g COD_fed/day, similar to yields at lower OLRs (2.6 and 3.4 g COD_fed/L/day). This performance persisted after the daily nanosheet replenishment stopped. Improvements were due to enhanced conductivity and microbial syntropy. The results showed a strong correlation with previous biochemical methane potential (BMP) assays, positioning BMP as a predictive tool for continuous-flow AD performance. Overall, this study demonstrated potential of GO/MGO nanosheets to improve the stability and efficiency of AD systems under stress.

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微量氧化石墨烯和磁性氧化石墨烯在压力下拯救厌氧城市污泥消化器

本研究评估了氧化石墨烯（GO）和磁性氧化石墨烯（MGO）纳米片在城市污泥半连续流厌氧消化（AD）中230 天的长期性能。在有机负荷率（olr）为2.6和3.4 g投喂/L/d时，20和200 mg/L的氧化石墨烯和MGO对AD性能没有影响。然而，在OLR为5.2 g CODfed/L/天的情况下，对照沼气池失效，20和200 mg/L氧化石墨烯和MGO的沼气产量维持在190 mL/g CODfed/天，与较低OLR（2.6和3.4 g CODfed/L/天）的产量相似。这种性能在每日补充纳米片停止后仍然存在。改进是由于导电性和微生物共生性的增强。结果显示，该结果与之前的生化甲烷势（BMP）测定结果有很强的相关性，将BMP定位为连续流AD性能的预测工具。总的来说，本研究证明了氧化石墨烯/MGO纳米片在提高AD系统在压力下的稳定性和效率方面的潜力。

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来源期刊

Bioresource Technology 工程技术-能源与燃料

CiteScore

20.80

自引率

19.30%

发文量

2013

审稿时长

12 days

期刊介绍： Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies. Topics include: • Biofuels: liquid and gaseous biofuels production, modeling and economics • Bioprocesses and bioproducts: biocatalysis and fermentations • Biomass and feedstocks utilization: bioconversion of agro-industrial residues • Environmental protection: biological waste treatment • Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.