Efficiency of Rice Bran for Removal of Organochlorine Compounds and Benzene from Industrial Wastewater

Abstract

Rice bran was found to effectively adsorb several organic compounds, such as dichloromethane, chloroform, carbon tetrachloride, trichloroethylene, tetrachloroethylene, and benzene. Equilibrium adsorption isotherms conformed to the Freundlich type (log-log linear). The adsorption of dichloromethane and chloroform by rice bran was observed over the range of pH 1-11. Therefore, rice bran is applicable for treatment of wastewater over a wide pH range. Dichloromethane was successfully removed from water samples with an average removal efficiency of 70% after 60 min when rice bran was added to water samples containing from 0.006 to 100 mg/L dichloromethane. The removal of these organochlorine compounds and benzene by rice bran was attributed to the uptake by intracellular particles called spherosomes. Here, we report the results of a fundamental study of the efficiency of rice bran for removal of organochlorine compounds and benzene using a batch system on the laboratory scale, and describe elucidation of the mechanism of removal of these compounds by rice bran.

Correlation between Organochlorine Compounds or Benzene Adsorption Efficiency and Number of Spherosomes from Different Plant Sources

“…1,2) Furthermore, it was confirmed that the spherosomes isolated from these adsorbents were effective in removing these organic compounds. 1,2) Analytical and laser microscopic data have confirmed that the removal of organochlorine compounds and benzene is dependent on the uptake of these compounds into intracellular particles called spherosomes.…”

“…1,2) Analytical and laser microscopic data have confirmed that the removal of organochlorine compounds and benzene is dependent on the uptake of these compounds into intracellular particles called spherosomes. 1,2) Spherosomes are widely distributed among plants and fungi but have not been observed in animal cells.…”

Effects of Spherosomes on Degradation of Pretilachlor and Esprocarb in Soil

“…1) Furthermore, it was confirmed that the spherosomes isolated from these adsorbents were effective in removing these organic compounds. 2) Analytical and laser microscopic data have confirmed that the removal of organochlorine compounds and benzene is dependent on the uptake of these compounds into intracellular particles called spherosomes.…”

Efficiency of Rice Bran for Removal of p-Dichlorobenzene from Water

“…Furthermore, it was confirmed that the spherosomes isolated from rice bran were effective in removing these organic compounds. 10) Analytical and laser microscopic data have confirmed that the removal of organochlorine compounds and benzene is dependent on the uptake of these compounds into intracellular particles called spherosomes. 10) Spherosomes are intracellular particles about 10 µm in diameter and widely distributed among plants and fungi.…”

“…10) Analytical and laser microscopic data have confirmed that the removal of organochlorine compounds and benzene is dependent on the uptake of these compounds into intracellular particles called spherosomes. 10) Spherosomes are intracellular particles about 10 µm in diameter and widely distributed among plants and fungi. 11) Neither the function of spherosomes nor its analysis is well understood.…”