College of Materials and Energy, South China Agricultural University, Guangzhou 510640, China; Key Laboratory of Biomass Energy and Material (KLBEM), Jiangsu Province, Nanjing 210007, China; State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
College of Materials and Energy, South China Agricultural University, Guangzhou 510640, China.
Bioresour Technol. 2017 Aug;238:182-187. doi: 10.1016/j.biortech.2017.03.174. Epub 2017 Mar 30.
Urban sludge was treated by Hydrothermal carbonization (HTC). The effect of hydrothermal carbonization temperature, mixing with or without catalysts on solid products yield, heavy metal contents, turbidity and COD value was evaluated. The result showed solid products yield decreased from 92.04% to 52.65% when the temperature increased from 180 to 300°C. And the Cu, Zn, and Pb contents under exchangeable states decreased and reached discharge standard. Addition of FeCl or Al(OH) resulted in a significant increase in the exchangeable states of Zn, Pb, Cr, and Cd and decrease in their residual states. The turbidity and COD value of hydrothermal liquid decreased from 450° to 175°, and 13 to 6.8g/L, with increasing hydrothermal temperature. Comparison with HTC, solid productivity from low-temperature pyrolysis is higher. The exchangeable states of Cu, Zn, and Cr exceeded the limiting values. Our results show HTC can facilitate transforming urban sludge into no-pollution and energy-rich products.
城市污泥采用水热碳化（HTC）进行处理。评价了水热碳化温度、是否添加催化剂以及混合催化剂对固形物产率、重金属含量、浊度和 COD 值的影响。结果表明，当温度从 180°C 升高到 300°C 时，固形物产率从 92.04%下降到 52.65%。可交换态的 Cu、Zn 和 Pb 含量降低，达到排放标准。添加 FeCl 或 Al(OH) 导致 Zn、Pb、Cr 和 Cd 的可交换态显著增加，而其残渣态减少。水热液体的浊度和 COD 值从 450°C 降至 175°C 和 13 至 6.8g/L，随着水热温度的升高而降低。与 HTC 相比，低温热解的固形物生产率更高。Cu、Zn 和 Cr 的可交换态超过了限值。我们的研究结果表明，HTC 可以将城市污泥转化为无污染、富含能源的产品。
