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

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.