Dechlorination of Municipal Solid Waste Incineration Fly Ash by Leaching with Fermentation Liquid of Food Waste

被引：12
|
作者：
Zou, Dezhi [1 ]
Wang, Xiaona [1 ]
Wu, Chuanfu [1 ,2 ]
Li, Teng [1 ]
Wang, Menglu [1 ]
Liu, Shu [3 ]
Wang, Qunhui [1 ,2 ]
Shimaoka, Takayuki [4 ]
机构：
[1] Univ Sci & Technol Beijing, Sch Energy & Environm Engn, Dept Environm Engn, 30 Xueyuan Rd, Beijing 100083, Peoples R China
[2] Univ Sci & Technol Beijing, Beijing Key Lab Resource Oriented Treatment Ind P, 30 Xueyuan Rd, Beijing 100083, Peoples R China
[3] Beihang Univ, Sch Space & Environm, Dept Environm Sci & Engn, 37 Xueyuan Rd, Beijing 100191, Peoples R China
[4] Kyushu Univ, Fac Engn, Dept Urban & Environm Engn, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan
来源：
SUSTAINABILITY | 2020年 / 12卷 / 11期
基金：
中国国家自然科学基金;
关键词：
MSWI fly ash; dechlorination; food waste; lactic acid fermentation; sludge fermentation; HEAVY-METALS; BOTTOM ASH; RAW-MATERIALS; MSWI BOTTOM; CHLORIDE; REMOVAL; CEMENT; STABILIZATION; EXTRACTION; RESIDUE;
D O I：
10.3390/su12114389
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Cement kiln collaborative disposal of municipal solid waste incineration (MSWI) fly ash (referred to as fly ash) can achieve harmless recycling of fly ash. However, because of high chlorine (Cl) content in fly ash, the practical application of this technology is seriously restricted. In order to find a suitable leaching solvent for dechlorination of fly ash, this study compared the effect of lactic acid fermentation liquid (FL) and sludge FL of food waste on dechlorination. Results show that 90% of water-insoluble Cl in fly ash can be removed by a three-step leaching process with lactic acid FL and sludge FL, and the Cl content in leached fly ash residue is 0.44% and 0.39%, respectively. According to calculation, permissible fraction of the residue after three-step leaching with addition of lactic acid FL and sludge FL in kiln is 4.28% and 4.99% higher than that of the residue after three-step leaching with pure water, respectively. Furthermore, the properties of leaching solvents after leaching experiments indicate that organic acids with low pH value and high concentration are more conducive for removal of water-insoluble Cl. Therefore, it is feasible to use two kinds of FL as leaching solvent for fly ash dechlorination.
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页数：11
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