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首页> 外文期刊>Journal of Environmental Management >Improving anaerobic sewage sludge digestion by implementation of a hyper-thermophilic prehydrolysis step
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Improving anaerobic sewage sludge digestion by implementation of a hyper-thermophilic prehydrolysis step

机译：通过实施超高温预水解步骤改善厌氧污水污泥的消化

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摘要

The present study focuses on a two-step process for treatment and stabilisation of primary sludge. The process consists of a hyper-thermophilic hydrolysis step operated at 70 ℃ and a hydraulic retention time (HRT) of 2 days followed by a thermophilic (55 ℃) anaerobic digestion step at a HRT of 13 days. A one-step anaerobic digester operated at 55 ℃ and 15 days HRT was used as a reference process. The two-step process was characterized by a 12% higher organic suspended solids removal efficiency and better pathogen reduction effect than the conventional one-step digestion. The microbial community of the digester fed with pre-treated sludge was characterised by a higher activity compared to that of the digester treating raw sludge. Moreover, the pre-treatment of the primary sludge resulted up to 48% increase of the methane potential (20.09 and 13.56mmol CH_4g~- VS~(-1) with and without pre-treatment, respectively) and up to 115% increase of the methane production rate. Finally it was shown that the extra energy requirements for the operation of a pre-treatment step would be covered by the energy produced from the extra methane production and in addition there would be a significant energy surplus of 2.17 kJ d~(-1) for the system tested.
机译：本研究着重于处理和稳定初级污泥的两步过程。该过程包括在70℃下进行的超高温水解步骤和2天的水力停留时间（HRT），然后在13天的HRT下进行嗜热（55℃）厌氧消化步骤。以55℃HRT 15天的一步式厌氧消化池为参考工艺。两步法的特点是有机悬浮物的去除效率比常规的一步法消化法高12％。与经过处理的污泥相比，消化池的微生物群落具有更高的活性。此外，对初级污泥的预处理可使甲烷潜力增加多达48％（分别进行预处理和不进行预处理的甲烷潜力分别为20.09和13.56mmol CH_4g〜-VS〜（-1）），而对甲烷的预处理最多可增加115％。甲烷生产率。最终表明，预处理步骤操作所需的额外能量将被多余的甲烷生产所产生的能量所覆盖，此外，对于以下情况，将存在2.17 kJ d〜（-1）的大量能量过剩经过测试的系统。

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