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Abstract
The release of heavy metals form industries into the environment caused many problems for both human health and aquatic ecosystem. There are different processes for heavy metals removable, physical, chemical and biological process. In this study we focus on biological treatment process for heavy metals removable .
. Micro algae due to their ubiquitous occurrence in nature have been studied extensively in this regard; they can sequester heavy metal ions by adsorption and absorption.
Spiru/ina is a species of blue green alage; it is used because of its high removal capacity of heavy metals from contaminated water.
Some variables were studied to specify the removal efficiency of heavy metals, such as lead and cadmium; Variables are initial concentration of lead and cadmium, biomass volume and co-cations. The samples are tested by atomic absorption and it is found that:
1- For initial concentration of lead and cadmium:
When initial concentration increases, the efficiency of removal decreases.
5 ppm (Lead) Efficiency = 94%
At 35 ppm (Lead) Efficiency = 92%
75 ppm (Lead) Efficiency = 89%
At
5 ppm (Cadmium) 35 ppm (Cadmium) 75 ppm (Cadmium)
Efficiency = 92% Efficiency = 90% Efficiency = 88%
2- For Biomass Volume:
When biomass volume increases, the removal efficiency increases. And this happened at initial concentration = 5 ppm as an example for the applied concentrations in this study.
20 ml Efficiency (Pb) = 91 %
At 40 ml Efficiency (Pb) = 94%
60 ml Efficiency (Pb) = 95%
At
20ml 40 ml 60ml
Efficiency (Cd) = 90% Efficiency (Cd) = 92% Efficiency (Cd) = 94%
3- For Co-Cations:
When cadmium was present with lead, efficiency of lead removal is not affected by cadmium, but on the other hand, the removal efficiency of cadmium decreased when cadmium was present with lead.
Lead 94% 92% 89%
At 5 ppm At 35 ppm At 75 ppm
Cadmium 86% 83% 79%