The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, No. 19, Xinjiekouwai Street, Beijing, 100875, China.
The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, No. 19, Xinjiekouwai Street, Beijing, 100875, China.
Chemosphere. 2019 Jun;225:579-587. doi: 10.1016/j.chemosphere.2019.03.056. Epub 2019 Mar 11.
Drinking water treatment residue (DWTR) and municipal waste incineration bottom ash (BA) have been traditionally considered as solid waste. With the development of urbanization, their subsequent treatment and resource regeneration need to be further researched. In this work, a composite geopolymer with BA and DWTR was successfully synthesized and applied in the immobilization of Cd, Pb and Zn. The analysis of the geopolymers with different ratios of BA and DWTR, curing times and heavy metals was performed through chemical analysis, SEM, FTIR, XRD, XPS, ICP-AES and compressive strength tests. The results show that the geopolymer samples based on BA and DWTR (BWG) presented higher compressive strength than the samples with single BA material. The sample with 20% DWTR and 80% BA (BWG20) possesses the highest compressive strength (24.10 MPa) among the materials ratios. Furthermore, the microstructure and characterization results indicate that the geopolymer matrix was successfully formed in BWG and was significantly changed by the ratio, curing time and addition of heavy metals. The immobilization efficiency for different categories and dosages of heavy metals by BWG20 were all higher than 99.43%. Moreover, the XPS results demonstrate that the heavy metals were immobilized in geopolymer mainly by divalent state forms.
饮用水处理残渣（DWTR）和城市垃圾焚烧底灰（BA）传统上被认为是固体废物。随着城市化的发展，需要进一步研究它们的后续处理和资源再生。在这项工作中，成功地合成了一种以 BA 和 DWTR 为原料的复合地聚合物，并将其应用于 Cd、Pb 和 Zn 的固定化。通过化学分析、SEM、FTIR、XRD、XPS、ICP-AES 和抗压强度测试，对不同比例的 BA 和 DWTR、养护时间和重金属的地聚合物进行了分析。结果表明，基于 BA 和 DWTR 的地聚合物样品（BWG）的抗压强度高于单一 BA 材料的样品。在材料比例中，含有 20% DWTR 和 80% BA 的样品（BWG20）具有最高的抗压强度（24.10 MPa）。此外，微观结构和表征结果表明，BWG 中成功形成了地聚合物基质，并通过比例、养护时间和重金属的添加而发生了显著变化。BWG20 对不同类别和剂量重金属的固定化效率均高于 99.43%。此外，XPS 结果表明，重金属主要以二价态形式固定在地聚合物中。
