In-situ synthesis of calcium aluminum layered double hydroxides for advanced treatment of leachate biochemical tail water

Yunfeng Xu; Ying Ding; Jingjing Wang; Mingying Zhu; Min Yang; Guangren Qian; Ying Sun

doi:10.1016/j.scitotenv.2019.134891

In-situ synthesis of calcium aluminum layered double hydroxides for advanced treatment of leachate biochemical tail water

Sci Total Environ. 2020 Jan 20:701:134891. doi: 10.1016/j.scitotenv.2019.134891. Epub 2019 Nov 1.

Authors

Yunfeng Xu¹, Ying Ding¹, Jingjing Wang¹, Mingying Zhu¹, Min Yang¹, Guangren Qian², Ying Sun³

Affiliations

¹ School of Environmental and Chemical Engineering, Shanghai University, No. 99 Shangda Rd., Shanghai 200444, PR China.
² School of Environmental and Chemical Engineering, Shanghai University, No. 99 Shangda Rd., Shanghai 200444, PR China. Electronic address: grqian@shu.edu.cn.
³ School of Environmental and Chemical Engineering, Shanghai University, No. 99 Shangda Rd., Shanghai 200444, PR China. Electronic address: ysun@shu.edu.cn.

PMID: 31726409
DOI: 10.1016/j.scitotenv.2019.134891

Abstract

In the leachate system, Ca-Al-LDH was synthesized in situ by adding calcium aluminum material (AC) and Ca (OH)₂. In the process of synthesis, the removal efficiencies of UV254, COD and TOC in the leachate reached 85.51%, 73.85% and 74.71%, respectively, and the organic matter could be effectively removed. XRD (X-Ray Diffraction) characterization analysis displayed that when AC and Ca (OH)₂ were added at a ratio of 3:1, Ca-Al-LDH could be synthesized efficiently. The effect of this method on the removal of pollutants in leachate was better than that of Ca-Al-LDH. EEM (Excitation Emission Matrix) and GC-MS (Gas Chromatography-Mass Spectrometer) characterization analysis showed that these results could be attributed to the coagulation of calcium aluminum material AC, LDH surface adsorption and ion exchange.

Keywords: Ca-Al-LDHs; In situ; Leachate biochemical tail water; Organic matters; Removal.