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题名: Effect of organic matter on phosphorus recovery from sewage sludge subjected to microwave hybrid pretreatment
作者: Wang, Yawei; Xiao, Qingcong; Zhong, Hui; Zheng, Xiang; Wei, Yuansong
刊名: JOURNAL OF ENVIRONMENTAL SCIENCES
出版日期: 2016-01
卷号: 39, 期号:0, 页码:29-36
关键词: Microwave pretreatment ; Sewage sludge ; Molecular weight distribution ; Phosphorus recovery ; Struvite
DOI: 10.1016/j.jes.2015.10.008
部门归属: 环境水质学国家重点实验室
英文摘要: Microwave (MW) hybrid processes are able to disrupt the flocculent structure of complex waste activated sludge, and help promote the recovery of phosphorus as struvite. In this study, to optimize struvite yield, (1) the characteristics of matter released in MW-hybrid treatments were compared, including MW, MW-acid, MW-alkali, MW-H2O2, and MW-H2O2-alkali. The results showed that selective release of carbon, nitrogen, phosphorus, Ca2+, and Mg2+ achieved by sludge pretreatment using MW-hybrid processes. MW-H2O2 is the recommended sludge pretreatment process for phosphorus recovery in the form of struvite. The ratio of Mg2+: NH4+ -N:PO43--P was 1.2: 2.9: 1 in the supernatant. (2) To clarify the effects of organic matter on struvite recovery, the composition and molecular weight distribution of organic matters were analyzed. Low molecular weight COD was found to facilitate the removal rate of NH4 +-N and PO43-P via crystallization, and the amorphous struvite crystals (< 1 kDa) from the filtered solutions had high purity. Therefore, the present study reveals the necessity of taking into consideration the interference effect of high molecular weight organic matters during struvite crystallization from sewage sludge. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/36033
Appears in Collections:环境水质学国家重点实验室_期刊论文

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