TY - JOUR
T1 - Dechlorination of municipal solidwaste incineration fly ash by leaching with fermentation liquid of food waste
AU - Zou, Dezhi
AU - Wang, Xiaona
AU - Wu, Chuanfu
AU - Li, Teng
AU - Wang, Menglu
AU - Liu, Shu
AU - Wang, Qunhui
AU - Shimaoka, Takayuki
N1 - Funding Information:
Funding: The study was supported by the National Key Research and Development Program of China (2016YFE0127800 and 2019YFC1906300), the National Natural Science Foundation of China (Grant No. 51778052) and the Sino-US-Japan Joint Laboratory on Organic Solid Waste Resource and Energy Technology of USTB.
Publisher Copyright:
© 2020 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2020/6/1
Y1 - 2020/6/1
N2 - 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.
AB - 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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U2 - 10.3390/su12114389
DO - 10.3390/su12114389
M3 - Article
AN - SCOPUS:85085920608
SN - 2071-1050
VL - 12
JO - Sustainability (Switzerland)
JF - Sustainability (Switzerland)
IS - 11
M1 - 4389
ER -
