磁铁矿和颗粒活性炭在改善厌氧污泥消化中的作用。
Roles of magnetite and granular activated carbon in improvement of anaerobic sludge digestion.
机构信息
Key Laboratory of Industrial Ecology and Environmental Engineering (Dalian University of Technology), Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China; Department of Environment Science, College of Environmental Sciences, Sichuan Agricultural University-Chengdu Campus, Chengdu, Sichuan 611130, China.
Key Laboratory of Industrial Ecology and Environmental Engineering (Dalian University of Technology), Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
出版信息
Bioresour Technol. 2018 Feb;249:666-672. doi: 10.1016/j.biortech.2017.10.047. Epub 2017 Oct 20.
Granular activated carbon (GAC) or magnetite could promote methane production from organic wastes, but their roles in enhancing anaerobic sludge digestion have not been clarified. GAC, magnetite and their combination were complemented into sludge digesters, respectively. Experimental results showed that average methane production increased by 7.3% for magnetite, 13.1% for GAC, and 20% for the combination of magnetite and GAC, and the effluent TCOD of the control, magnetite, GAC and magnetite-GAC digesters on day 56 were 53.2, 49.6, 48.0 and 46.6 g/L, respectively. Scanning electron microscope (SEM), nitrogen adsorption, Fourier transform infrared spectroscopy (FTIR) and microbial analysis indicated that magnetite enriched iron-reducing bacteria responsible for sludge hydrolysis while GAC enhanced syntrophic metabolism between iron-reducing bacteria and methanogens due to its high electrical conductivity and large surface area. Supplementing magnetite and GAC together into an anaerobic digester simultaneously accelerated sludge hydrolysis and methane production, resulting in better sludge digestion performance.
颗粒活性炭（GAC）或磁铁矿可以促进有机废物产生甲烷，但它们在促进厌氧污泥消化中的作用尚未阐明。分别将 GAC、磁铁矿及其组合补充到污泥消化器中。实验结果表明，磁铁矿使甲烷平均产量增加了 7.3%，GAC 增加了 13.1%，磁铁矿和 GAC 的组合增加了 20%，在第 56 天，对照、磁铁矿、GAC 和磁铁矿-GAC 消化器的出水 TCOD 分别为 53.2、49.6、48.0 和 46.6 g/L。扫描电子显微镜（SEM）、氮吸附、傅里叶变换红外光谱（FTIR）和微生物分析表明，磁铁矿富集了负责污泥水解的铁还原菌，而 GAC 由于其高导电性和大表面积，增强了铁还原菌和产甲烷菌之间的共代谢。同时将磁铁矿和 GAC 一起补充到厌氧消化器中，可同时加速污泥水解和甲烷生成，从而提高污泥消化性能。
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