In this study, co-hydrothermal carbonization (co-HTC) of sewage sludge (SS) and lignocellulosic biomass was conducted at 220 °C for 1 h, and transformation behaviour of heavy metals during co-HTC, along with fuel properties, were investigated. The results showed that the majority of Cr, Ni, Cu and Zn was still accumulated in hydrochar during individual HTC of SS. The addition of lignocellulosic biomass could effectively reduce (F1+F2) fractions of Ni and Cr. Owing to the positive effect on the reduction of (F1+F2) fractions of Cu, the addition of lignin exhibited the lowest potential ecological risk index. Furthermore, compared with the hydrochar derived from SS, it was found that fuel ratio of hydrochar derived from co-HTC increased to 0.08─0.39 and high HHV (6.86─12.90 MJ/kg) was also achieved. The TGA results displayed that the combustion behaviors of hydrochars derived from co-HTC were expected to be safer and stable than that of hydrochar derived from SS. These findings offered an effective approach to convert SS into clean solid fuel with the targeted regulation of heavy metals.

在这项研究中，污泥（SS）和木质纤维素生物质的共水热碳化（co-HTC）在220°C下进行了1 h，研究了共HTC期间重金属的转化行为以及燃料性质。 。结果表明，SS单独进行HTC期间，大部分的Cr，Ni，Cu和Zn仍积累在水煤中。木质纤维素生物质的添加可以有效减少Ni和Cr的（F1 + F2）分数。由于对减少铜的（F1 + F2）馏分具有积极作用，因此添加木质素具有最低的潜在生态风险指数。此外，与SS衍生的碳氢化合物相比，发现co-HTC衍生的碳氢化合物的燃料比提高到0.08-0.39，并且还实现了高HHV（6.86-12.90 MJ / kg）。TGA结果表明，与co-HTC相比，衍生自co-HTC的碳氢化合物的燃烧行为被认为更安全，稳定。这些发现提供了一种有效的方法，可以通过有针对性的重金属调节将SS转化为清洁的固体燃料。