Municipal solid waste incineration fly ash exposed to carbonation and acid rain corrosion scenarios: Release behavior, environmental risk, and dissolution mechanism of toxic metals

被引：57

作者：

Li, Weihua ^{[1
]}

Sun, Yingjie ^{[1
]}

Xin, Mingxue ^{[1
]}

Bian, Rongxing ^{[1
]}

Wang, Huawei ^{[1
,2
]}

Wang, Ya-nan ^{[1
]}

Hu, Zhanbo ^{[3
]}

Linh, Ho Nhut ^{[4
]}

Zhang, Dalei ^{[1
]}

机构：

[1] Qingdao Univ Technol, Sch Environm & Municipal Engn, Qingdao Solid Waste Pollut Control & Resource Eng, Qingdao 266033, Peoples R China

[2] Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Key Lab Environm Pollut & Bioremediat, Urumqi 830011, Peoples R China

[3] Guangxi Yijiang Environm Protect Technol Co Ltd, Nanning 530007, Peoples R China

[4] Kyushu Univ, Fac Engn, Dept Urban & Environm Engn, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2020年 / 744卷

基金：

中国国家自然科学基金;

关键词：

Municipal solid waste incineration fly ash; CO2-saturated water; Acid rain; Toxic metal leaching; Environmental risk; Mechanism; HEAVY-METALS; LEACHING BEHAVIOR; BOTTOM ASH; ACCELERATED CARBONATION; OIL-SHALE; SEQUESTRATION; COMBUSTION; LANDFILL; RAW; STABILIZATION;

D O I：

10.1016/j.scitotenv.2020.140857

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

This study investigated the leaching behavior, environmental risk, and dissolution mechanism of toxic metals (TMs) in solidified/stabilized municipal solid waste incineration fly ash (MSWI FA) exposed to alternative "carbonation + acid rain corrosion" disposal scenarios. The content of TMs (mg/kg) showed a trend of Zn (12,187.10 +/- 168.60) > Pb (3374.43 +/- 66.12) > Cu (1055.14 +/- 32.52) > Cr (127.95 +/- 8.12) > Cd (119.05 +/- 6.26) > Ni (49.50 +/- 3.20). Initial leaching of CO2-saturated water (CSW) and replacement of simulated acid rain (SAR) increased the environmental risk of leached TMs. The results of "average release rate" (mg/(kg.d)) of TMs indicated that Zn (0.8307)/Cu (0.0278)/Cd (0.0109) and Cu (0.0581)/Cr (0.001176)/Ni (0.004339) in phosphoric acid stabilized FA and Pb (0.0753)/Cr (0.001921)/Ni (0.00111) and Pb (0.0656)/Zn (1.0560)/Cd (0.0050) in Portland cement solidified FA were the key "problem TMs" during carbonation and acid rain corrosion, respectively. CSW leaching increased the independent environmental risk of most TMs in residual FA (especially Zn/Cd) due to the increased carbonate-bound fraction. Compared with independent carbonation, alternative "carbonation + acid rain corrosion" contributed to a higher comprehensive environmental risk for TMs in residual FA. CSW leaching system was an indirect carbonation based on CO2-water and FA matrix, in which "nucleation and dissolution" of carbonates and "immobilization and dissolution" of TMs coexisted. The dissolution mechanism of TMs was mainly controlled by reaction equilibrium of nucleation and dissolution of carbonates containing TMs. Dissolution and nucleation were the dominant mechanism in the early and later periods of CSW leaching, respectively. Carbonate layer dissolution, H+ corrosion/displacement, and counter-ion effect (SO42- > NO3- > Cl-) were the main mechanisms affecting TM dissolution during SAR leaching. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：11

共 53 条

[1]

Agrawal M., 2016, ENVIRONMENTAL, V2, P1

[2] Investigation of accelerated carbonation for the stabilisation of MSW incinerator ashes and the sequestration of CO2 [J].