期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 313, 期 -, 页码 78-84出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2016.03.084
关键词
Smelting furnace; Industrial wastewater sludge; Heavy metal; Vitrification; Elution
资金
- R&D Center for Reduction of Non-CO2 Greenhouse Gases - Korea Ministry of Environment (MOE) as a 'Global Top Environment RD Program' [201300 1690006]
- Korea Energy Technology Evaluation Institute [20133030100860]
- Human Resources Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korea Ministry of Trade, Industry and Energy [20134030200230]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20133030100860] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In South Korea, ocean dumping of organic sludges has been prohibited by the London Convention and by Korean regulations. Therefore, the Government of South Korea has sought an alternative process for the disposal of organic sludges. Recently, the combined fry-drying and melting system has been recognized as an efficient way to utilize the energy content of organic industrial sludge. Three kinds of fry-dried industrial sludges (obtained from industrial sites DG, DJ and GM), which had average heating value of 20,470 kJ/kg and less than 5% water content, were tested. Unlike sewage sludge, industrial sludge contains high concentrations of heavy metals and thus cannot be directly utilized as refuse-derived fuel. The dried sludges were melted in a furnace and then rapidly cooled to form vitrified slags; the vitrification of SiO2 securely encapsulates hazardous heavy metals within the crystalline structure of the slag. To evaluate the hazard of vitrified slag, the heavy metal elution concentration was analyzed. Following vitrification, Hg, Cd, Cr+6, HCN and Pb concentrations were not detectable, whereas Cu concentration decreased from 26.78 mg/L to 0.42 mg/L in DJ sludge, from 27.10 mg/L to 0.13 mg/L in DG and from 49.47 mg/L to 0.047 mg/L in GM sludge. (C) 2016 Elsevier B.V. All rights reserved.
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