Study on the Experimental Conditions for Removing Chloroacetic Acid from WaterReport as inadecuate




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The adsorption characteristics of chloroacetic acid CA on Bacillus thuringiensis Bt powder was studied. The adsorption influence laws of the adsorption time, Bt powder concentration, temperature and pH value were investigated. The chloroacetic acid adsorbed on Bt powder quickly, and the adsorption amount reached to 80.7% of the balance adsorption after 5min. The adsorption attained to equilibrium after 65 min. When the concentration of Bt powder increased from 1mg-mL to 15.0 mg-mL, the adsorption percentage of chloroacetic acid ranged from 22.8% to 89.8%. The results above indicated that adsorption percentage increased with the increase of the concentration of Bt powder. In the range of 5℃- 50℃, the equilibrium data agree with the Langmuir isotherm equation. The adsorption amount declined as the adsorption temperature increased. When pH was 2 and 10, the adsorption amount was 0.172 mg-mg and 0.265 mg-mg, respectively. The results above indicated the adsorption amount increased along with the ascension of pH value. The chloroacetic acid–Bt powder complexes was not easily desorbed by water, the desorption percentage by twice washing was ranged from 5.56% to 19.54%. The results showed that the desorption rate increased with the increase of ratio between chloroacetic acid and bacterium in the adsorption complex.

KEYWORDS

Bacillus thuringiensis; chloroacetic acid; adsorption; removal

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Author: Xueyong Zhou, Lang Zhou, He Li, Man Zhao, Aiju Zhang

Source: http://www.scirp.org/



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