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Citation: Li Jing, Deng Zhaoping, Li Xia. Ammonium Removal from Landfill Leachate by Calcium Oxide Modified Kaolin[J]. Chemistry, ;2017, 80(1): 99-103. shu

Ammonium Removal from Landfill Leachate by Calcium Oxide Modified Kaolin

College of Materials and Chemistry and Chemical Engineering, Chengdu University of Technology, Chengdu 610059

Corresponding author: Deng Zhaoping, dengshp@cdut.edu.cn
Received Date: 1 July 2016
Accepted Date: 22 August 2016

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The calcium oxide modified kaolin was characterized by XRD, SEM, FT-IR, and applied in landfill leachate treatment. The effects of the dosage, the initial solution pH, adsorption time on the removal of ammonia nitrogen, as well as the adsorption mechanism were discussed. The results showed that the main products of calcium oxide modified kaolin is cementitious material hydrate (calcium silicoaluminate and Al-containing C-S-H), and its shape is a honeycomb. The removal efficiencies of 160 g/L adsorbent to landfill leachate with 3520 mg/L ammonia, pH 7.53~7.80 can reach 82.6%, the adsorption capacity was 18.2 mg/g after absorbed 60 minutes. The equilibrium isotherm and kinetics models showed that the adsorption of ammonia by calcium oxide modified kaolin agrees with Langmuir equation and quasi-second-order equation well, and the correlation coefficients are 0.9723, 0.9989, and the adsorption progress includes intra-particle diffusion and the boundary layer diffusion.
- Calcium oxide,
- Modified kaolin,
- Landfill leachate,
- Ammonia nitrogen,
- Removal
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