Wei Wei, Guo Wenshan, Ngo Huu Hao, Mannina Giorgio, Wang Dongbo, Chen Xueming, Liu Yiwen, Peng Lai, Ni Bing-Jie
Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, New South Wales 2007, Australia.
Dipartimento di Ingegneria, Viale delle Scienze, Ed.8, 90128 Palermo, Italy.
Bioresour Technol. 2020 Jun;306:123159. doi: 10.1016/j.biortech.2020.123159. Epub 2020 Mar 7.
This study conducted batch and continuous tests to reveal the feasibility of corn stover biochar on improving anaerobic digestion of primary sludge (PS). Dosing biochar (1.82, 2.55 and 3.06 g/g Total Solids (TS)) in digester improved methane content increasing from 67.5% to 81.3-87.3% and enhanced methane production by 8.6-17.8%. Model analysis indicated that biochar accelerated PS hydrolysis and enhanced methane potential of PS. The mechanistic studies showed that biochar enhanced process stability provided by strong buffering capacity and alleviated NH inhibition. In continuous test over 116 days, the volatile solids (VS) destruction in the biochar-dosed digester increased by 14.9%, resulting in a 14% reduction in the volume of digestate for disposal. Biochar changed microbial community in an expected direction for anaerobic digestion. This work suggests that biochar technology would apply to co-digestion of WAS and PS to maximize the energy recovery and sludge reduction from the two sludge streams.
本研究进行了批次和连续试验，以揭示玉米秸秆生物炭对改善初沉污泥（PS）厌氧消化的可行性。在消化池中投加生物炭（1.82、2.55和3.06克/克总固体（TS））可使甲烷含量从67.5%提高到81.3 - 87.3%，并使甲烷产量提高8.6 - 17.8%。模型分析表明，生物炭加速了PS的水解并提高了PS的甲烷潜力。机理研究表明，生物炭通过强大的缓冲能力增强了过程稳定性，并减轻了氨抑制。在超过116天的连续试验中，投加生物炭的消化池中挥发性固体（VS）的破坏率提高了14.9%，从而使消化产物的处置体积减少了14%。生物炭使厌氧消化的微生物群落朝着预期方向变化。这项工作表明，生物炭技术可应用于剩余活性污泥（WAS）和初沉污泥（PS）的共消化，以最大限度地从这两种污泥流中回收能量和减少污泥量。
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