Faculty of Engineering and Natural Sciences, Tampere University, P.O.Box 541, 33104 Tampere University, Finland.
Faculty of Engineering and Natural Sciences, Tampere University, P.O.Box 541, 33104 Tampere University, Finland; Department of Civil Engineering, Indian Institute of Technology Hyberabad, Hyberabad, India.
Waste Manag. 2022 Jun 15;147:73-82. doi: 10.1016/j.wasman.2022.05.013. Epub 2022 May 25.
The use of pyrolysis process to valorize digestate from anaerobic digestion (AD) of municipal sewage sludge for biochar production was piloted in a central biogas plant. The pyrolysis also generates pyrolysis liquid with high organics and nutrient contents that currently has no value and requires treatment, which could potentially be done in AD. As the pyrolysis liquid may contain inhibitory compounds, we investigated the effects of adding the pyrolysis liquid on AD of sewage sludge and thermal hydrolysis pretreated sewage sludge (THSS) simulating the full-scale centralized biogas plant conditions. In batch assays, the pyrolysis liquid as such did not produce any methane, and the 1% and 5% (v/w) shares suppressed the methane production from THSS by 14-19%, while a smaller decrease in methane production was observed with sewage sludge. However, in the semi-continuous reactor experiments, pyrolysis liquid at a 1% (v/w) share was added in sewage sludge or THSS feed without affecting the methane yields or digestate characteristics. The laboratory results indicated that pyrolysis liquid can be treated in AD, while extrapolating the results to the centralized biogas plant indicated minor increase in the overall methane production and an increased potential for ammonium recovery.
在一个中央沼气厂中，采用热解工艺将城市污水污泥厌氧消化（AD）产生的消化物转化为生物炭。热解还会产生具有高有机物和营养物含量的热解液，但目前这些液体没有价值，需要进行处理，而这一过程可能在 AD 中完成。由于热解液中可能含有抑制性化合物，我们研究了添加热解液对 AD 中污水污泥和模拟全规模集中沼气厂条件的热水解预处理污水污泥（THSS）的影响。在分批试验中，热解液本身没有产生任何甲烷，而 1%和 5%（v/w）的份额抑制了 THSS 的甲烷生成 14-19%，而在污水污泥中观察到甲烷生成的减少较小。然而，在半连续反应器实验中，以 1%（v/w）的份额向污水污泥或 THSS 进料中添加热解液，不会影响甲烷产量或消化物特性。实验室结果表明，热解液可以在 AD 中进行处理，而将结果推断到集中沼气厂，则表明整体甲烷产量略有增加，以及铵回收的潜力增加。
