Аннотация
In this study, an attempt was made to reduce the pollutants of Al-Sayyadin Lagoon water, which is still the main site of open fishing in Ismailia, Egypt, using the wild and mutant strains of two green microalgae called Chlamydomonas reinhardtii CC1021 and Parachlorella kessleri PC. Four mutant strains were obtained from UV mutagenesis of the two wild types. One mutant strain was from C. reinhardtii CC1021 (CC1021Mut1) and the 3 other strains ((PCMut2, PCMut3 and PCMut4) were from P. kessleri PC. Reduction of nutrients like phosphate, ammonia, chemical oxygen demand (COD), biological oxygen demand (BOD) as well as some heavy metals like Co, Zn by the six microalgal strains was studied. The results obtained showed that the treated wild and mutant strains with mixture of TAP medium and polluted water showed highest growth rate and were more efficient in improving water quality than that treated with polluted water only in phycoremediation. The dose of UV radiation used in this study had no negative impact on the efficiency of bio-remediation potentials of the tested mutant strains but in some results it enhanced their growth rate and removal efficiency. The statistical analysis indicated that there was significant differences (p<0.05) found in bioremediation of water parameters between the selected algae. The wild and mutant strains of P. kessleri had higher efficiency in phycoremediation than the wild and mutant strains of C. reinhardtii CC1021. The mutant algae of P. kessleri PC exhibited significant higher growth rate and removal efficiency than the wild type. Key words: Bioremediation, Chlamydomonas reinhardtii, Parachlorella kessleri, ultra violet (UV) mutagenesis, wild and mutant strains.