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Published on: September 12, 2019
[Study on performance of double mineral base liner using modified bentonite as active material]
Zhi-Hui Qu1, Yong-Sheng Zhao, Tie-Jun Wang
1College of Environment and Resources, Jilin University, Chanchun 130026, China. qzh-19831001@163.com
Huan Jing Ke Xue= Huanjing Kexue
|August 11, 2009
Summary
Modified bentonites, including roasted and dual-cation organobentonites, show superior pollutant absorption compared to clay. Roasting bentonite is best for ammonium, while organobentonite excels at removing organic pollutants from landfill leachate.
Area of Science:
- Environmental Science
- Geochemistry
- Materials Science
Background:
- Landfill leachate poses environmental risks due to its complex pollutant mixture.
- Effective containment and treatment strategies are crucial for sustainable landfill management.
- Bentonite and its modified forms are investigated for their potential in leachate barrier systems.
Purpose of the Study:
- To compare the pollutant absorption capacities of clay, roasted bentonite, and dual-cation organobentonite.
- To evaluate the performance of double mineral base liners using these materials for controlling leachate permeation and removing pollutants.
- To determine the optimal modified bentonite for specific landfill pollutant types.
Main Methods:
- Static adsorption experiments were conducted to determine the adsorption equilibrium time and capacity for different bentonite types.
- Double mineral base liners (clay/roasted bentonite and clay/dual-cation organobentonite) were constructed and tested using landfill leachate.
- Permeation coefficients and pollutant removal efficiencies (NH4+, organic pollutants, COD) were measured.
Main Results:
- Adsorption equilibrium for all tested materials (clay, roasted bentonite, dual-cation organobentonite) was achieved within 24 hours.
- Roasted bentonite and dual-cation organobentonite exhibited higher absorption capacities than raw clay.
- Clay/roasted bentonite liners showed higher NH4+ absorption, while clay/dual-cation organobentonite liners demonstrated superior removal of organic pollutants, with a 33.82% higher COD attenuation rate.
Conclusions:
- Both roasted bentonite and dual-cation organobentonite are effective alternatives to clay for landfill leachate treatment.
- The choice of modified bentonite as the active layer should be tailored to the predominant pollutants in the landfill leachate.
- Dual-cation organobentonite is particularly effective for managing organic pollutants and reducing COD in landfill leachate.
