tailieunhanh - Experimental study of the bio-oil production from sewage sludge by supercritical conversion process

Environment-friendly treatment of sewage sludge has become tremendously important. Conversion ofsewage sludge into energy products by environment-friendly conversion process, with its energy recovery and environmental benefits, is being paid significant attention. | ARTICLE IN PRESS Waste Management xxx 2013 xxx-xxx Contents lists available at SciVerse ScienceDirect Waste Management journal homepage locate wasman Experimental study of the bio-oil production from sewage sludge by supercritical conversion process Yan Wang Guanyi Chen Yanbin Li Beibei Yan Donghui Pan School of Environmental Science and Technology State Key Laboratory of Engines Tianjin University Tianjin 300072 China ARTICLE INFO ABSTRACT Article history Received 28 February 2013 Accepted 23 May 2013 Available online xxxx Keywords Sewage sludge Supercritical water Direct liquefaction Bio-oil Environment-friendly treatment of sewage sludge has become tremendously important. Conversion of sewage sludge into energy products by environment-friendly conversion process with its energy recovery and environmental benefits is being paid significant attention. Direct liquefaction of sewage sludge into bio-oils with supercritical water SCW was therefore put forward in this study as de-water usually requiring intensive energy input is not necessary in this direct liquefaction. Supercritical water may act as a strong solvent and also a reactant as well as catalyst promoting reaction process. Experiments were carried out in a self designed high-pressure reaction system with varying operating conditions. Through orthogonal experiments it was found that temperature and residence time dominated on bio-oil yield compared with other operating parameters. Temperature from 350 to 500 C and reaction residence time of 0 30 60 min were accordingly investigated in details respectively. Under supercritical conversion the maximum bio-oil yield could achieve which was performed at 375 C and 0 min reaction residence time. Meanwhile function of supercritical water was concluded. Fuel property analysis showed the potential of bio-oil application as crude fuel. 2013 Elsevier Ltd. All rights reserved. 1. Introduction As an inevitable residue originating from the process of