标题：Reductive solidification/stabilization of chromate in municipal solid waste incineration fly ash by ascorbic acid and blast furnace slag

作者：Zhou, X (Zhou, Xian); Zhou, M (Zhou, Min); Wu, X (Wu, Xian); Han, Y (Han, Yi); Geng, JJ (Geng, Junjun); Wang, T (Wang, Teng); Wan, S (Wan, Sha); Hou, HB (Hou, Haobo)

来源出版物：CHEMOSPHERE 卷：182 页码：76-84 DOI：10.1016/j.chemosphere.2017.04.072 出版年：SEP 2017

摘要：Fly ash is a hazardous byproduct of municipal solid waste incineration (MSWI). Cementitious material that is based on ground-granulated blast furnace slag (GGBFS) has been tested and proposed as a binder to stabilize Pb, Cd, and Zn in MSWI fly ash (FA). Cr, however, still easily leaches from MSWI FA. Different reagents, such as ascorbic acid (VC), NaAlO2, and trisodium salt nonahydrate, were investigated as potintial Cr stabilizers. The results of the toxicity characteristic leaching procedure (TCLP) showed that VC significantly improved the stabilization of Cr via the reduction of Cr(VI) to Cr(III). VC, however, could interfere with the hydration process. Most available Cr was transformed into stable Cr forms at the optimum VC content of 2 wt%. Cr leaching was strongly pH dependent and could be represented by a quintic polynomial model. The results of X-ray diffraction and scanning electron microscopy-energy dispersive analysis revealed that hollow spheres in raw FA were partially filled with hydration products, resulting in the dense and homogeneous microstructure of the solidified samples. The crystal structures of C-S-H and ettringite retained Zn and Cr ions. In summary, GGBFS-based cementitious material with the low addition of 2 wt% VC effectively immobilizes Cr-bearing MSWI FA.

入藏号：WOS:000403991700010

文献类型：Article

语种：English

作者关键词： Municipal solid waste incineration fly ash; Chromium; Stabilization; Specification distribution; pH-dependence test

扩展关键词： POLLUTION-CONTROL RESIDUES; HEAVY-METAL; SEQUENTIAL EXTRACTION; HEXAVALENT CHROMIUM; LEACHING MECHANISMS; THERMAL-TREATMENT; PORTLAND-CEMENT; FRIEDELS SALT; REMOVAL; IMMOBILIZATION

通讯作者地址：Hou, HB (通讯作者),Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Hubei, Peoples R China.

电子邮件地址：houhb@whu.edu.cn

地址：

[Zhou, Xian; Zhou, Min; Han, Yi; Geng, Junjun; Wang, Teng; Wan, Sha; Hou, Haobo] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Hubei, Peoples R China.

[Wu, Xian] Huazhong Univ Sci & Technol, Sch Environm Sci & Engn, Wuhan 430074, Hubei, Peoples R China.

研究方向：Environmental Sciences & Ecology

ISSN：0045-6535

eISSN: 1879-1298

影响因子：4.208