Abstract
Background: Contamination with heavy metal ions has been recognized an important issue that require alternatives to be faced. Adsorption is considered a promising technique to remove these pollutants from aqueous solution. However, disposal problems of polluted biomass have limited its application. Objective: In this work, banana peels biomass is employed as biosorbent for hexavalent chromium uptake. Methods/Statistical Analysis: The effects of particle size, temperature and dosage were considered during adsorption batch experiments. Sorption-desorption cycles were performed in order to analyze the biosorbent useful life. To solve biomass disposal problems, solidification/stabilization immobilization technique was used for heavy metal ions encapsulation through bricks preparation. These bricks were subjected to mechanical resistance and leaching tests to identify if they obey quality and environmental standard. Findings: Results revealed that biosorbent dosage was the parameter that most contributed adsorption process. After sorption-desorption cycles, the biosorbent reduced its removal capacity by 30%. Application/Improvements: The mechanical resistance and leaching tests suggested the applicability of residual biosorbent for preparing bricks due to the low leachate concentration and high compression resistance. Keywords: Adsorption, Biomass, Desorption, Heavy Metals, Immobilization
Highlights
Several heavy metals have been discharged into the environment by industrial activities worldwide
One of the main limitations for adsorption application is the disposal problem of adsorbent material after sorptiondesorption cycles, many works have proposed the use of heavy metal encapsulation technologies such as solidification/stabilization immobilization, which reduce the potential migration of these pollutants in the waste[5]
The influence of particle size on adsorption process was studied by varying particle size in 0.355, 0.5 and 1 mm
Summary
Several heavy metals have been discharged into the environment by industrial activities worldwide. One of the main limitations for adsorption application is the disposal problem of adsorbent material after sorptiondesorption cycles, many works have proposed the use of heavy metal encapsulation technologies such as solidification/stabilization immobilization, which reduce the potential migration of these pollutants in the waste[5]. To solve biomass disposal problems, solidification/stabilization immobilization technique was used for heavy metal ions encapsulation through bricks preparation. These bricks were subjected to mechanical resistance and leaching tests to identify if they obey quality and environmental standard. Application/Improvements: The mechanical resistance and leaching tests suggested the applicability of residual biosorbent for preparing bricks due to the low leachate concentration and high compression resistance
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