TY - JOUR
T1 - Effect of water-washing on the co-removal of chlorine and heavy metals in air pollution control residue from MSW incineration
AU - Yang, Zhenzhou
AU - Tian, Sicong
AU - Ji, Ru
AU - Liu, Lili
AU - Wang, Xidong
AU - Zhang, Zuotai
PY - 2017/10/1
Y1 - 2017/10/1
N2 - The present study systemically investigated the effect of a water-washing process on the removal of harmful chlorides, sulfates, and heavy metals in the air pollution control (APC) residue from municipal solid wastes incineration (MSWI), for sake of a better reuse and disposal of this kind of waste. In addition, the kinetic study was conducted to reveal the releasing mechanism of relevant element in the residue. The results show that, over 70 wt.% of chlorides and nearly 25 wt.% of sulfates in the residue could be removed by water washing. Based on an economical consideration, the optimal operation conditions for water washing of APC residue was at liquid/solid (L/S) ratio of 3 mL:1 g and extracting time of 5 min. As expected, the concentrations of Co, Cr, Fe, Ni, V and Cu in the washing effluent increased with time during the washing process. However, the extracting regime differs among different heavy metals. The concentrations of Ba and Mn increased firstly but declined afterwards, and concentrations of Pb and Zn gradually declined while Cd and As kept constant with the increase of extracting time. It is worth mentioning that the bubbling of CO2 into the washing effluent is promisingly effective for a further removal of Pb, Cu and Zn. Furthermore, kinetic study of the water washing process reveals that the extracting of heavy metals during water washing follows a second-order model.
AB - The present study systemically investigated the effect of a water-washing process on the removal of harmful chlorides, sulfates, and heavy metals in the air pollution control (APC) residue from municipal solid wastes incineration (MSWI), for sake of a better reuse and disposal of this kind of waste. In addition, the kinetic study was conducted to reveal the releasing mechanism of relevant element in the residue. The results show that, over 70 wt.% of chlorides and nearly 25 wt.% of sulfates in the residue could be removed by water washing. Based on an economical consideration, the optimal operation conditions for water washing of APC residue was at liquid/solid (L/S) ratio of 3 mL:1 g and extracting time of 5 min. As expected, the concentrations of Co, Cr, Fe, Ni, V and Cu in the washing effluent increased with time during the washing process. However, the extracting regime differs among different heavy metals. The concentrations of Ba and Mn increased firstly but declined afterwards, and concentrations of Pb and Zn gradually declined while Cd and As kept constant with the increase of extracting time. It is worth mentioning that the bubbling of CO2 into the washing effluent is promisingly effective for a further removal of Pb, Cu and Zn. Furthermore, kinetic study of the water washing process reveals that the extracting of heavy metals during water washing follows a second-order model.
KW - APC residue
KW - Chloride
KW - Heavy metal
KW - Kinetic study
KW - Water washing
UR - http://www.scopus.com/inward/record.url?scp=85021206790&partnerID=8YFLogxK
U2 - 10.1016/j.wasman.2017.06.039
DO - 10.1016/j.wasman.2017.06.039
M3 - Article
C2 - 28655464
AN - SCOPUS:85021206790
VL - 68
SP - 221
EP - 231
JO - Waste Management
JF - Waste Management
SN - 0956-053X
ER -