An in-situ biochar-enhanced anaerobic membrane bioreactor for swine wastewater treatment under various organic loading rates

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Nianwen Chen , Xinbo Zhang , Qing Du , Huizhong Wang , Zhiwen Wang , Junzhi Ren , Hongxia Li , Wenshan Guo , Huu Hao Ngo
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Abstract

A biochar-assisted anaerobic membrane bioreactor (BC-AnMBR) was conducted to evaluate the performance in treating swine wastewater with different organic loading rates (OLR) ranging from 0.38 to 1.13 kg-COD/(m3.d). Results indicated that adding spent coffee grounds biochar (SCG-BC) improved the organic removal efficiency compared to the conventional AnMBR, with an overall COD removal rate of > 95.01%. Meanwhile, methane production of up to 0.22 LCH4/gCOD with an improvement of 45.45% was achieved under a high OLR of 1.13 kg-COD/(m3.d). Furthermore, the transmembrane pressure (TMP) in the BC-AnMBR system was stable at 4.5 kPa, and no irreversible membrane fouling occurred within 125 days. Microbial community analysis revealed that the addition of SCG-BC increased the relative abundance of autotrophic methanogenic archaea, particularly Methanosarcina (from 0.11% to 11.16%) and Methanothrix (from 16.34% to 24.05%). More importantly, Desulfobacterota and Firmicutes phylum with direct interspecific electron transfer (DIET) capabilities were also enriched with autotrophic methanogens. Analysis of the electron transfer pathway showed that the concentration of c-type cytochromes increased by 38.60% in the presence of SCG-BC, and thus facilitated the establishment of DIET and maintained high activity of the electron transfer system even at high OLR. In short, the BC-AnMBR system performs well under various OLR conditions and is stable in the recovery energy system for swine wastewater.

Abstract Image

原位生物炭强化厌氧膜生物反应器在不同有机负荷率下处理猪废水的方法
研究人员对生物炭辅助厌氧膜生物反应器(BC-AnMBR)处理不同有机负荷率(OLR)(0.38 至 1.13 kg-COD/(m3.d))猪场废水的性能进行了评估。结果表明,与传统的 AnMBR 相比,添加废咖啡渣生物炭(SCG-BC)提高了有机物去除效率,总体 COD 去除率为 95.01%。同时,在 1.13 kg-COD/(m3.d) 的高 OLR 条件下,甲烷产量高达 0.22 LCH4/gCOD,提高了 45.45%。此外,BC-AnMBR 系统的跨膜压力(TMP)稳定在 4.5 kPa,并且在 125 天内没有发生不可逆的膜堵塞。微生物群落分析表明,添加 SCG-BC 增加了自养型甲烷古菌的相对丰度,尤其是 Methanosarcina(从 0.11% 增加到 11.16%)和 Methanothrix(从 16.34% 增加到 24.05%)。更重要的是,具有直接种间电子传递(DIET)能力的脱硫菌门(Desulfobacterota)和真菌门(Firmicutes)也富集了自养型甲烷菌。对电子传递途径的分析表明,在 SCG-BC 的存在下,c 型细胞色素的浓度增加了 38.60%,从而促进了 DIET 的建立,即使在高 OLR 下也能保持电子传递系统的高活性。总之,BC-AnMBR 系统在各种 OLR 条件下表现良好,在猪废水回收能源系统中具有稳定性。
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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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