Xu Zhenjia, Zhou Jun, Liu Yongdi, Gu Lifeng, Wu Xujun, Zhang Xueying
College of Environmental Sciences and Engineering, Nanjing Tech University Nanjing 211816 China
College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University Nanjing 211816 China.
RSC Adv. 2018 Nov 15;8(67):38574-38581. doi: 10.1039/c8ra05350b. eCollection 2018 Nov 14.
The effects of hydrothermal carbonization (hydrothermal carbonization temperature, hydrothermal carbonization time, pH) on the dehydration performance of dyeing sludge were studied. The specific resistance, viscosity and floccular morphology of sludge before and after hydrothermal carbonization were analyzed. The physical and chemical properties of the liquid were also determined. The results showed that the dehydration performance of sludge was optimum, when the reaction temperature was 180 °C, the reaction time 4 h and the pH was 5.0. Here the specific resistance to filtration and viscosity were 93.69% and 96.78% lower, respectively, than the control group. When the sludge was hydrothermally carbonized, the sludge flocs were broken due to extreme conditions of high temperature and high pressure, which formed a porous mesh structure with better water permeability. The cohesion of the sludge colloidal structure was reduced, the capillary suction time was reduced by 88.89%, and the sludge dewatering performance was improved. This study shows the feasibility of the use of hydrothermal carbonization in sludge reduction.
研究了水热碳化（水热碳化温度、水热碳化时间、pH值）对印染污泥脱水性能的影响。分析了水热碳化前后污泥的比阻、黏度和絮体形态。还测定了液体的物理和化学性质。结果表明，当反应温度为180℃、反应时间为4 h、pH值为5.0时，污泥的脱水性能最佳。此时，过滤比阻和黏度分别比对照组降低了93.69%和96.78%。水热碳化时，污泥絮体因高温高压的极端条件而破碎，形成了透水性更好的多孔网状结构。污泥胶体结构的凝聚力降低，毛细吸水时间减少了88.89%，污泥脱水性能得到改善。本研究表明了水热碳化用于污泥减量的可行性。
