Heavy metals pollution is very important in Environment. Toxicity and accumulation characteristics ofthese metals are more noticeable for health aspects. Today, using bio-sorbent is more noticeablebecause these ways are ecofriendly and economic. In this survey, in addit
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Heavy metals pollution is very important in Environment. Toxicity and accumulation characteristics ofthese metals are more noticeable for health aspects. Today, using bio-sorbent is more noticeablebecause these ways are ecofriendly and economic. In this survey, in addition to achieving Ni and Cdbio-sorption by bio-solid , the results of other relative surveys used for comparing the results andbio-sorption affinity discussion.Bio-solid powder produced from municipal excess sludge by drying, grinding and grainsizing. Ni andCd solutions in 0.25 and 0.75 mille molar have been contacted which 0.5, 1, 2 and 4 grams of biosolidin pH 4, 200 rpm stirring, 24-260C temperature and two hours (continuous 5-420 min in kineticstudy) time and samples have been analyzed with atomic absorption spectrophotometer to kinetic andisotherm modeling study and comparing the results.The maximum equilibrium adsorption of metals observed at two hours contact time and increasing ofpH up to 4 increased the adsorption rate. The equilibrium data of both metals could be fitted byLangmuir isotherm equation and the maximum adsorption capacity (qmax) for cadmium and nickel are0.38 and 0.195 mmol/gr dry bio-solid, respectively.The same as other biomasses studied for bio-sorption of heavy metals bio-sorption affinity of bio-solidfor Cd is more than Ni. Generally, the bio-sorption affinity of algae and fungi for heavy metalsbio-sorption is more than sludge and bacteria that is the result of cellular wall characteristics
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