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A New Method to Treat Oily Water Using Rice Husk Ash Onboard Vessel

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Abstract

All vessels must have bilge water. The bilge is referred as water come from rough seas, rain, leaks in the hull or other interior spillage. The water that collects in the bilge must be pumped out to prevent the bilge from becoming too full and threatening to sink the ship. Depending on the design of the ship and function, bilge water may contain water, oil, urine, detergents, solvents, chemicals, particles, and other materials. Absorption process is widely being used by various treatment plants, either for treating water or wastewater. The main function of absorption is to remove any contaminants such as heavy metals, organic and inorganic chemicals from it. One of the components of absorption is rice husk ash. The aim of this study is to investigate the suitability of rice husk ash as an absorbent, specifically to absorb oil in bilge water. Zinc chloride was added to the rice husk ash since an activated carbon enhanced absorption capacity. It was found that oil was removed from the water and clear water was produced after the absorption process. Thus, the use of rice husk ash water has proven to be one of the best options for ship-owner in oily water treatment.

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Activated carbons were produced from acorn shell by chemical activation with zinc chloride (ZnCl2) at 600 °C in N2 atmosphere and their characteristics were investigated. The effects of activation temperature, duration time, impregnation concentration of agent and impregnation time were examined. Adsorption capacity was demonstrated with BET and iodine number. The obtained activated carbons were characterized by measuring their porosities and pore size distributions. BET surface area of the best produced activated carbon was 1289 m2/g. The surface chemical characteristics of activated carbons were determined by FT-IR spectroscopic method. The microstructure of the produced activated carbons was examined by scanning electron microscopy (SEM). Thermal gravimetry (TG) and derivative thermal gravimetry (DTG) analysis of produced activated carbon was carried out.
Chapter
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The activated carbon prepared by carbonisation of rice husk with sulphuric acid followed by CO2 activation showed 88% removal of total chromium and greater than 99% removal of hexavalent chromium. As with commercial carbon, the removal was maximum at a minimum proton to chromium ratio of 5.0 and chromium to carbon ratio of 0.0065. The above ratios were found to be valid over a wide range of Cr (VI) concentrations. The Freundlich adsorption plots gave identical slope values indicating similar type of adsorption mechanism are involved for the removal by both carbons. Coloumn studies showed capacity of 8.9 mg/g and 6.3 mg/g for rice husk and commercialc arbons respectively, for Cr (VI) removal. The average percentage of Cr (VI) recovery was found to be 22.5% and 30.6% respectively when alkali followed by acid were used for regeneration. The developed carbon was used to remove Cr (VI) from the waste waters of a chromium plating shop.
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Removal of contaminants in water by using rice husk ash (RHA) as absorbent
  • S N Islam