SULFIDE REMOVAL FROM SEAWATER WITH WASTE CATALYSTS

A comparative study was made in order to estimate the feasibility of using waste catalysts for low level sulfide removal from seawater polluted with sulfide under aerated and deaerated conditions. Six different waste catalysts were used from a typical petrochemical plant. A batch recycle reactor with a large recycle ratio was utilized for this purpose. It is found that low temperature shift catalyst has a superior scavenging efficiency for sulfide removal with an estimated sulfide half life of about ten minutes. Generally all the catalysts performed better than the homogeneous reaction. The presence of oxygen, can influence the effectiveness of these catalysts in removing sulfide. The sulfide reaction kinetic was zero order with respect to sulfide concentration and the batch recycle reactor containing the waste catalysts with large recycle ratio was shown to approximate ideal stirred tank reactor.