Research and application progress of supercritical water oxidation technology on waste sludge treatment

doi:10.11949/j.issn.0438-1157.20161346

Abstract

Abstract:

Supercritical water oxidation(SCWO), as a new and highly effective technique for waste disposal attributing to the special nature of water in the supercritical state, has significant advantages of disposing of sewage and industrial sludge which contain dissolved organic matters(DOM) and persistent organic pollutants(POPs).This paper summarized the progress in basic principles of SCWO, including free radicals reaction as same as wet air oxidation, internal combustion by thermal flames, etc.Research progress on treatment of different kinds of sludge by SCWO at domestic and abroad were reviewed, and main influence factors such as reaction temperature, systematic pressure, reaction time, catalyst, oxidant and co-oxidant, were concluded systematically.Applications of SCWO for sludge treatment in pilot scale and commercial full scale, in USA, Ireland, Sweden and China were introduced in details including its technological process, technical parameters and investment/operation cost.Based on the analysis of its existing disadvantages and problems, referring to salt precipitation, corrosion, high energy consumption and difficult operation of equipment, the future research direction for SCWO were also pointed out.

Key words: sewage sludge, industrial sludge, supercritical water, oxidation, catalysts, co-oxidation

摘要：

超临界水氧化技术是一种新型且高效的废物处理技术，利用水在超临界状态下的特殊性质使其在处理含有机物及难降解有机污染物的城市污泥、工业污泥等时具有独特的优势。介绍了超临界水氧化技术机理的研究进展，介绍了国内外近年来超临界水氧化技术在污泥处理领域的研究进展，从反应时间、反应温度、体系压力、催化剂、氧化剂、共氧化剂等影响因素系统总结。介绍了该技术在国内外污泥处理领域的实际应用现状、具体工艺流程及成本效益，并针对目前存在的问题对超临界水氧化处理技术处理污泥的前景方向进行了展望。

关键词: 城市污泥, 工业污泥, 超临界水, 氧化, 催化剂, 共氧化剂

CLC Number:

X799.3

SHI Dezhi, ZHANG Jinlu, HU Chunyan, ZHANG Chao, LI Pengfei. Research and application progress of supercritical water oxidation technology on waste sludge treatment[J]. CIESC Journal, 2017, 68(1): 37-49.

石德智, 张金露, 胡春艳, 张超, 李鹏飞. 超临界水氧化技术处理污泥的研究与应用进展[J]. 化工学报, 2017, 68(1): 37-49.

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