Journal
BIORESOURCE TECHNOLOGY
Volume 240, Issue -, Pages 165-170Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.03.048
Keywords
MSWI leachate; Waste incineration flue gas; Calcium; Dissolved organic matter
Funding
- National Science Foundation of China [21377079, 51578329]
- Program for Innovative Research Team in University [IRT13078]
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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 100 min 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 254 nm 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. (C) 2017 Elsevier Ltd. All rights reserved.
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