In this study, hydrothermal carbonization (HTC) of sewage sludge(SS) was carried out at a temperature of 270℃ and a resulting pressure of 7-9 MPa with 2 h. The effect of feed water pH values in the range of 2-12 on hydrochar characteristics, organic component and thermal behavior was evaluated. The result shows that with the pH value increasing, ash content shows a trend of decline, and organic components in the hydrochar become significantly simpler than SS. hydrochar is more beneficial to produce a fatty substance during an acidic environment and alkaline environments favor the formation of N-containing organic compounds and ketone organics, especially in strongly alkaline environments. Compared to the SS, hydrochar burning interval shortened 100℃ and the combustion of hydrochar is more durable. Considering the organic composition and combustion performance of hydrochar, it is found that the hydrochar prepared under 270-5 condition has the best effect.

中文翻译：

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污水污泥的水热碳化：给水pH值对水焦的理化性质，有机成分和热行为的影响。

在这项研究中，污水污泥（SS）的水热碳化（HTC）在270℃的温度下进行，反应压力为7-9 MPa，历时2 h。评估了进水pH值在2-12范围内对水焦特性，有机成分和热行为的影响。结果表明，随着pH值的增加，灰分呈下降趋势，并且水煤层中的有机成分比SS明显简化。在酸性环境中，水焦炭更有利于生产脂肪物质，而碱性环境则有利于形成含氮有机化合物和酮有机物，特别是在强碱性环境中。与不锈钢相比，炭火燃烧的时间间隔缩短了100℃，并且炭火的燃烧更加持久。