Calcium and organic matter removal by carbonation process with waste incineration flue gas towards improvement of leachate biotreatment performance

• DOI: 10.1016/j.biortech.2017.03.048
• Publication Date: 2017-03-11T16:47:06Z
• Authors: Cheng Zhang; Xuedong Zhu; Liang Wu; Qingtao Li; Jianyong Liu; Guangren Qian
• Keywords: Carbonates; Incineration; Solid Waste; 01 natural sciences; Carbon; 6. Clean water; Refuse Disposal; 12. Responsible consumption; 13. Climate action; 11. Sustainability; Calcium; 0105 earth and related environmental sciences

Municipal solid wastes incineration (MSWI) flue gas was employed as the carbon source for in-situ calcium removal from MSWI leachate. Calcium removal efficiency was 95-97% with pH of 10.0-11.0 over 100min of flue gas aeration, with both bound Ca and free Ca being removed effectively. The fluorescence intensity of tryptophan, protein-like and humic acid-like compounds increased after carbonation process. The decrease of bound Ca with the increase of precipitate indicated that calcium was mainly converted to calcium carbonate precipitate. It suggested that the interaction between dissolved organic matter and Ca2+ was weakened. Moreover, 10-16% of chemical oxygen demand removal and the decrease of ultraviolet absorption at 254nm indicated that some organics, especially aromatic compound decreased via adsorption onto the surface of calcium carbonate. The results indicate that introduce of waste incineration flue gas could be a feasible way for calcium removal from leachate.