Investigation on Pseudomonas aeruginosa PAO1-driven bioleaching behavior of heavy metals in a novel geopolymer synthesized from municipal solid waste incineration bottom ash

被引：13
作者：
Biswal, Basanta Kumar [1 ,2 ]
Zhu, Weiping [2 ]
Yang, En-Hua [2 ]
机构：
[1] Nanyang Technol Univ, Energy Res Inst, Res Techno Plaza,50 Nanyang Dr, Singapore 637553, Singapore
[2] Nanyang Technol Univ, Sch Civil & Environm Engn, 50 Nanyang Ave, Singapore 639798, Singapore
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2020年 / 241卷
关键词：
Geopolymer; Incineration bottom ash (IBA); Bioleaching; Pseudomonas aeruginosa PAO1; Heavy metal immobilization; Material characterization; FLY-ASH; ALKALI ACTIVATION; ORGANIC-MATTER; METAKAOLIN; IMMOBILIZATION; DISSOLUTION; SILICATE; CALCIUM; CEMENT;
D O I：
10.1016/j.conbuildmat.2020.118005
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This study synthesized a novel geopolymer utilizing 20% incineration bottom ash (IBA) by metakaolin replacement in the mix matrix, then conducted heavy metal bioleaching tests using Pseudomonas aeruginosa PAO1 (environmental bacterium). The findings showed bacterial interactions with geopolymers noticeably enhanced bioleaching, nevertheless, physicochemical processes involved in geopolymer formation significantly reduced bioleaching rate (14-100%) of several toxic elements (Cu, As, Pb and Cr). The metals possibly physically/chemically immobilized in geopolymer matrix. Chemical (SAM-HCl) dissolution confirmed geopolymer formation, while FE-SEM displayed distinct morphology between metakaolin- and IBA-based geopolymers. This research suggests IBA/similar wastes could be recycled for environmentally friendly geopolymer production. (C) 2020 Elsevier Ltd. All rights reserved.
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页数：11
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