Alternativní způsob odstraňování vybraných těžkých kovů z modelové vody

Abstract

The diploma work considers the posibilities of separation of heavy metal from water environment by biomass ash. The ash is regarded as raw material important to treatment of water containing heavy metals. The ash is used as agent with united effect for pH adjustment and for sorption of selected heavy metals in a form of cation – copper, zinc and lead present in separate model solution and in mixed model solution. For batch experiment three types of ash with a diverse composition and burning technology were chosen. The experiments set two of them as the most appropriate for removing of selected heavy metals – the ashes from biomass combustion chambers Krnov and Roštín. Adsorption isotherms were set for comparsion of the results of sorption process and it was demonstrated that the Langmuir isotherm fits the data best. Maxima of absorbed amounts were in a case of Zinc (10,638 ± 0,806)mg∙0,1g^(-1) and (10,417 ± 0,343)mg∙0,1g^(-1), in a case of Copper (30,303 ± 3,673)mg∙0,1g^(-1) and (35,714 ± 5,082)mg∙0,1g^(-1) and in a case of Lead (41,667 ± 11,345)mg∙0,1g^(-1) and (50,001 ± 15,461)mg∙0,1g^(-1). The addition of ash caused increase of the pH value, in some cases caused release of metal ions back to solution.