Properties on NO removal over pyrolyzed sludge carbon

doi:10.11949/j.issn.0438-1157.20171293

Abstract

Abstract:

In this study, sewage sludge was pyrolyzed and treated by acid-washing, KOH activation, Fe impregnation and H₂ reduction for NO removal. The results showed that the original samples containing Fe₂P and FeS had remarkable performance for NO conversion. At 450-500℃, the maximum NO conversion over the original samples was about 81%. However, NO conversion over acid-washed and KOH activated samples decreased dramatically due to removal of Fe₂P and FeS, and the maximum NO conversion at 450-500℃ was only about 30% and 53%, respectively. However, the maximum NO conversion over pyrolyzed sludge carbon impregnated with Fe was only 50% at 450-500℃. The reason was that Fe in the impregnated sample was mainly existed in the form of Fe₂O₃. After H₂ reduction, Fe₂O₃ was reduced to Fe₂P and FeS, and the maximum NO conversion was also greatly enhanced to 94% at 450-500℃.

Key words: pyrolysis, catalysis, pollution, sewage sludge, NO conversion

摘要：

以废水污泥热解产生的污泥热解炭为原料，通过酸洗、活化、负载Fe、H₂还原等方式考察不同污泥热解炭样品对脱硝性能的影响。结果表明，污泥原样中的Fe₂P、FeS等低价态的铁具有良好的脱硝性能，450～500℃时最大脱硝效率达到81%。经过HNO₃酸洗和KOH活化后的污泥热解炭，因为去除了Fe₂P、FeS等低价态的铁，脱硝效率大幅下降，在450～500℃的最大效率分别仅为30%和53%。而热解污泥负载样中的Fe主要以Fe₂O₃形式存在，其最大脱硝效率在450～500℃时只有50%。经过H₂还原后，负载样中的Fe₂O₃被还原为Fe₂P、FeS等低价态的铁，其最大脱硝效率在450～500℃时上升至94%。

关键词: 热解, 催化, 污染, 污泥, 脱硝

CLC Number:

YIN Andong, DENG Wenyi, MA Jingchen, SU Yaxin. Properties on NO removal over pyrolyzed sludge carbon[J]. CIESC Journal, 2018, 69(6): 2655-2663.

印安冬, 邓文义, 马璟宸, 苏亚欣. 污泥热解炭脱除NO特性[J]. 化工学报, 2018, 69(6): 2655-2663.

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