REMEDIATION OF WASTEWATER CONTAINING HEAVY METALS USING RAW

REMEDIATION OF WASTEWATER CONTAINING HEAVY METALS USING RAW AND MODIFIED DIATOMITE Miloš T. Nenadović

The main goal l To investigate structural changes in diatomite l Changes caused by mechanical milling with magnesium hydride l It is very important to know what is going on with lattice parametar of Mg-hydride.

There are two types of raw diatomite l The first one is CYLINDRICAL

The second one has rod like particles This two diatomites has the same chemical structure, but configuration is tottaly different. l Diatomite is completly natural product!!! l

What is happened next? Magnesium hydride was premilled for 10 hours l Then diatomite was added and the milling was performed for another 1 hour. l Milling speed of 850 rpm was chosen for the purpose of this study l And then we have got something like this!!!! l

Structural changes This is the sample Mg. H 2 -diatomite composite l Ratio Mg. H 2 : diatomite = 90 : 10 l

Structural changes This is also Mg. H 2 – diatomite composte but ratio between this two constituents is l Mg. H 2 : diatomite = 10 : 90 l

Structural changes l We can see some changes in the structure of diatomite and Mg-hydride l It is strongly depend of the ratio of constituents l The sample with 90 % of diatomite shows sponge like structure l It is better for sorption of heavy metals

XRD analisys It shows very close moving to the smaller values of 2Θ angle. l That is very important because it proves increasing of the lattice parameter. l Better removal capacity. l

Conclusion l Investigation demonstrated that diatomite has a higher removal capacity for Pb 2+, Ni 2+, Cu 2+, Hg 2+ and Cd 2+ from water than untreated diatomite. The adsorption capacity of modified diatomite increased by decreasing the quantity of magnesium hydride deposited on the surface.