Adsorption of Hydantoins on Activated Carbon,
GEORGIA INST OF TECH ATLANTA SCHOOL OF CIVIL ENGINEERING
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A carbon absorption study was performed using hydantoin, 5-5-dimethylhydantoin, and 5-ethyl-5-methylhydantoin as solutes. The study included single solute batch kinetic tests to determine the required elapsed time for each solute to reach solution equilibrium with Filtrasorb 400 activated carbon. Single solute isotherm tests were performed to establish Xm values amount of solute adsorbedunit weight of carbon for various solution equilibrium concentrations. Multisolute isotherm points were utilized to determine the relative order of absorption strength on the activated carbon. It was determined that absorption of three solutes followed the order 5-ethyl-5-methylhydantoin 5,5-dimenthyldantoin hydantoin. Absorption column tests were performed for single solute, bisolute, and trisolute solutions as well as an undiluted coal gasification wastewater containing predominantly hydantoin compounds. The column absorption studies in concert with the isotherm studies demonstrated that activated carbon has low absorption capacity for hydantoin, 5,5-dimethylhydantoin, and 5-ethyl-5-methylhydantoin. Absorption using activated carbon did not appear to be an effective treatment process for the removal of hydantoins from the coal gasification wastewater.
- Water Pollution and Control