Stabilization of Waste-to-Energy (WTE) fly ash for disposal in landfills or use as cement substitute

被引:15
|
作者
Tian, Yixi [1 ,3 ]
Themelis, Nickolas J. [1 ]
Zhao, Diandian [2 ]
Bourtsalas, A. C. Thanos [1 ]
Kawashima, Shiho [2 ]
机构
[1] Columbia Univ, Dept Earth & Environm Engn, New York, NY 10027 USA
[2] Columbia Univ, Dept Civil Engn & Engn Mech, New York, NY 10027 USA
[3] Columbia Univ, 500 West 120th St,Mudd Bldg 918, New York, NY 10027 USA
关键词
Waste-to-Energy; WTE fly ash; Phosphoric acid stabilization; Cement mortar; Leachability; XRD quantification (QXRD); MSWI BOTTOM ASH; POLLUTION-CONTROL RESIDUES; HEAVY-METAL STABILIZATION; LEACHING BEHAVIOR; PORTLAND-CEMENT; WASHING PROCESS; BLENDED CEMENT; ACCELERATED CARBONATION; CHEMICAL STABILIZATION; INCINERATION ASH;
D O I
10.1016/j.wasman.2022.06.043
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 two approaches for managing Waste-to-Energy (WTE) fly ash (FA): (i) phosphoric acid stabilization of FA and disposal in non-hazardous landfills, so that it can pass the U.S. TCLP procedure and meet the U.S. Resource Conservation and Recovery Act (RCRA) standards; (ii) use of FA or phosphoric acid stabilized fly ash (PFA) as cement substitute in construction for avoiding disposal in landfills and reducing the consumption of Portland cement. The effect of stabilization was identified by TCLP tests and XRD quantification (QXRD), which showed that the economically optimal concentration for PFA to pass the RCRA was 1 mol/L H3PO4 (equivalent to 0.4 mol of H3PO4/kg of FA). Zn/Pb-phosphates were formed in treated ash by using high concentration H3PO4 (e.g., 3 mol/L). Thus, the hazardous FA was chemically stabilized to PFA, that were both discussed as cement substitute. QXRD and SEM results showed that both FA and PFA (1 mol/L H3PO4) chemically reacted with cement and water. Up to 25 vol% of the cement can be replaced by FA or PFA, with similar mechanical performance of cement mortars than that of reference. Testing by LEAF Method 1313-pH dependence showed that the FA and PFA cement mortars exhibited the same leachability of heavy metals; therefore, this study demonstrated the technical feasibility of utilizing either raw FA or stabilized PFA as supplementary cementitious material. The leachability of heavy metals in optimal FA or PFA 25 vol% cement mortar was under the U.K. WAC non-hazardous limits.
引用
收藏
页码:227 / 243
页数:17
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