Document Type : Original research articles
Authors
1
microbiology and botany department- faculty of science - suez canal university
2
Department of Botany and Microbiology, Faculty of Science, Zagazig University, Zagazig, Sharqia, Egypt
3
Botany and Microbiology Department, Faculty of Science, Suez Canal University, Ismailia, Egypt
4
Botany department, Faculty of Science, Suez Canal University
Abstract
This work evaluated the performance of the selected microalgae for heavy metal removal from wastewater and physicochemical parameters for 2 and 3 weeks of incubation. The effect of Chlorella vulgaris and Scenedesmus quadricauda on pH, EC and TDS reduction % reached high levels after 2 and 3 weeks, than Chlamydomonas reinhardtii. Chlorella vulgaris was registered the maximum reduction % values of BOD and COD after the same times. Generally, Chlorella vulgaris recorded the most effective reducer of physical parameters than Chlamydomonas reinhardtii and Scenedesmus quadricauda. The selected species consumed the nitrogenous (nitrate, nitrite; ammonium) and phosphate from raw wastewater. After 2 weeks of incubation, Scenedesmus quadricauda recorded high reduction % of NH3 and TN while Chlorella vulgaris removed NO2 and NO3 but Chlamydomonas reinhardtii reduced high levels of TP. After 3 weeks of incubation, Scenedesmus quadricauda was the most effective removal to NO2, NO3, TN and TP. The removal efficiency of N/P ratio (ppm) was increased after two weeks than after 3 weeks in order Chlorella vulgaris> Scenedesmus quadricauda. The potential of Chlamydomonas reinhardtii was recorded high levels of heavy metals removal % after 2 weeks (Zn, Pb, Cu, Mn, Fe; Ni), Chlorella vulgaris (Ag, Zn; Mn) then Scenedesmus quadricauda (Cd; Mn). After 3 weeks, Chlamydomonas reinhardtii (Pb, Mn, Fe; Ni) and Chlorella vulgaris (Zn, Cu, Mn; Fe) were still able to absorb high amounts of heavy metals than Scenedesmus quadricauda (Ag, Cd; Mn). Chlamydomonas reinhardtii and Chlorella vulgaris were found highly capable to remediate heavy metals than Scenedesmus quadricauda.
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