Green process for supercritical water oxidation of sewage sludge with red mud as CO2absorbent

doi:10.1016/j.jece.2016.06.013

CORC > 重庆绿色智能技术研究院 > 中国科学院重庆绿色智能技术研究院 > 环境友好化学过程研究中心

	Green process for supercritical water oxidation of sewage sludge with red mud as CO2absorbent
	Chen, Hongzhen1,2,3 ; Wang, Guangwei 1,2,3,4; Xu, Yuanjian 1,3; Chen, Zhong1,3 ; Yin, Fengjun1,3
刊名	Journal of Environmental Chemical Engineering
	2016
卷号	4 期号:3 页码:3065-3074
DOI	10.1016/j.jece.2016.06.013
通讯作者	Wang, Guangwei (wangguangwei@cigit.ac.cn)
英文摘要	To mineralize CO2produced in situ and other acidic substances originating from organic components in sewage sludge, we developed a green SCWO system involving the treatment of sewage sludge with red mud as an alkaline absorbent. In this new system, two steps of mineralization were covered. Primary mineralization occurred inside the SCWO reaction vessels with part of CO2produced in situ. By this primary treatment, total inorganic carbon of the solid residue increased rapidly, predominantly in the form of calcite. Moreover, the S and P content increased by more than ten times compared with that of pure sludge. The pH of the drained water increased from 5.16 to about 7.7 with the addition of 2% red mud. The second mineralization step involved the exhausts cleaning reaction using red mud slurry. With 2.5 h of cleaning reactions at pressures of 0.1, 1, 3, and 5 MPa, approximately 4.49, 5.30, 6.06, and 7.52 g, respectively, of CO2per 100 g of red mud were bound in calcite. The high CO2absorption capacity was ascribed to the high pressure cleaning reaction, which was conveniently achieved in this SCWO system just by a simple adjustment of the back-pressure valve. With this green SCWO disposal, CO2level in the exhausts were cut to below 800 ppm (mg/L); SO2and nitrogen oxides (NO, NO2) diminished to below 15 ppm and 12 ppm, respectively. Due to the comparative stability of the solid residues obtained, they can easily be handled using conventional methods or recycled for a range of industrial applications including building materials, water treatment materials, special ceramics, or silicate cements. © 2016 Elsevier Ltd. All rights reserved.
电子版国际标准刊号	22133437
语种	英语
内容类型	期刊论文
源URL	[http://119.78.100.138/handle/2HOD01W0/4446]
专题	环境友好化学过程研究中心水污染过程与治理研究中心
作者单位	1.Chongqing Institute of Green and Intelligent Technology (CIGIT), Chinese Academy of Sciences, Chongqing; 400714, China; 2.Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, Tsinghua University, Beijing; 100084, China; 3.Key Laboratory of Reservoir Aquatic Environment, Chinese Academy of Sciences, Chongqing; 400714, China; 4.Environmentally-Benign Chemical Process Research Center, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Shuitu Hi-tech Industrial Park, Shuitu Town, No. 266 Fangzheng Avenue, Beibei District, Chongqing; 400714, China
推荐引用方式 GB/T 7714	Chen, Hongzhen,Wang, Guangwei,Xu, Yuanjian,et al. Green process for supercritical water oxidation of sewage sludge with red mud as CO2absorbent[J]. Journal of Environmental Chemical Engineering,2016,4(3):3065-3074.
APA	Chen, Hongzhen,Wang, Guangwei,Xu, Yuanjian,Chen, Zhong,&Yin, Fengjun.(2016).Green process for supercritical water oxidation of sewage sludge with red mud as CO2absorbent.Journal of Environmental Chemical Engineering,4(3),3065-3074.
MLA	Chen, Hongzhen,et al."Green process for supercritical water oxidation of sewage sludge with red mud as CO2absorbent".Journal of Environmental Chemical Engineering 4.3(2016):3065-3074.