污水污泥的超临界水气化：产气和磷回收。
Supercritical water gasification of sewage sludge: gas production and phosphorus recovery.
机构信息
Química de Recursos Energéticos y Medio Ambiente, Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, UdeA - Colombia, Calle 70 No. 52-21, Medellín, Colombia.
Sustainable Process Technology Group, Faculty of Science and Technology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands.
出版信息
Bioresour Technol. 2014 Dec;174:167-75. doi: 10.1016/j.biortech.2014.10.003. Epub 2014 Oct 8.
In this study, the feasibility of the gasification of dewatered sewage sludge in supercritical water (SCW) for energy recovery combined with P-recovery from the solid residue generated in this process was investigated. SCWG temperature (400°C, 500°C, 600°C) and residence time (15min, 30min, 60min) were varied to investigate their effects on gas production and the P recovery by acid leaching. The results show that the dry gas composition for this uncatalyzed gasification of sewage sludge in SCW mainly comprised of CO2, CO, CH4, H2, and some C2-C3 compounds. Higher temperatures and longer residence times favored the production of H2 and CH4. After SCWG, more than 95% of the P could be recovered from the solid residue by leaching with acids. SCWG combined with acid leaching seems an effective method for both energy recovery and high P recovery from sewage sludge.
在这项研究中，研究了在超临界水（SCW）中将脱水污水污泥气化以回收能源，同时从该过程中产生的固体残渣中回收磷的可行性。改变了 SCWG 温度（400°C、500°C、600°C）和停留时间（15min、30min、60min），以研究它们对气体产量和通过酸浸回收磷的影响。结果表明，未经催化的 SCW 中污水污泥气化的干气组成主要包括 CO2、CO、CH4、H2 和一些 C2-C3 化合物。较高的温度和较长的停留时间有利于 H2 和 CH4 的生成。SCWG 后，通过酸浸可从固体残渣中回收超过 95%的磷。SCWG 与酸浸相结合似乎是从污水污泥中回收能源和高磷的有效方法。
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