为探究城市污泥的有效处理方式，以城市污泥为研究对象，进行了水热和水热氧化(H2O2为氧化剂)的对比实验，探究在150~250 ℃下H2O2对城市污泥水热氧化过程中固液产物分布、水热炭含水率、重金属含量及生态毒性、水热液pH值、挥发性脂肪酸(Volatile fatty acid，VFAs)及氨氮(NH3-N)浓度的影响。结果表明：城市污泥经水热和水热氧化处理后，水热炭的含水率分别降至46.4%和36.6%；相比于污泥原料，水热和水热氧化处理后水热炭中固定的Pb、Cd质量浓度均有所增加，200 ℃时水热氧化产生的水热炭中Pb、Cd质量浓度分别比水热处理提高了16%和7%，同时水热炭中两种具有潜在毒性的重金属相对含量有所增加；此外，水热氧化处理提高了残液中NH3-N和VFAs质量浓度，在200和230 ℃时，VFAs和NH3-N质量浓度比水热处理分别提高了35.8%和56%；在230 ℃时，水热氧化处理能更好的降解污泥中的有机物，是污泥减量化和资源化处理的合适温度。

To explore the effective treatment of municipal sludge,the comparative experiment of the thermal hydrolysis (HT) process and hydrothermal oxidation (HTO) process using H2O2 as the oxidant of municipal sludge treatment was carried out.Under the treatment temperatures from 150 ℃ to 250 ℃,the effects of H2O2 on the solid and liquid products distribution,hydrochar moisture content,heavy metal content and ecological toxicity,pH of aqueous products,volatile fatty acid (VFAs) and ammonia nitrogen (NH3N)) contents of aqueous products were investigated.The results showed that the moisture contents of the hydrochar from the HT and HTO processes of the municipal sludge were reduced to 46.4% and 36.6% respectively.Compared with the raw municipal sludge,the mass concentrations of Pb and Cd contained in the HT and HTO hydrochar were both increased.Pb and Cd mass concentrations in HTO prepared at 200 ℃ were increased by 16% and 7% respectively compared to those of HT hydrochar.Meanwhile,the relative toxicity of heavy metals contained in HTO hydrochar was increased.Moreover,the mass concentrations of NH3N and VFAs contained in the resulted aqueous product from HTO process were increased by 35.8% and 56% respectively against those from HT process at 200 ℃ and 230 ℃.In general,HTO can better degrade organic matter in sludge at 230 ℃,which is the appropriate temperature for sludge reduction and resource treatment.

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上海理工大学科技发展项目(2019KJFZ213)；吉林省产业技术研究与开发专项项目（2019C056-3）