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Synthetic microalgae ecology is a promising approach to regulate the concentrations of nutrients in wastewater reservoirs. The aim of experiments was to evaluate the role of six microalgae monocultures and their consortia in restoring the water quality of water reservoirs represented here in the form of media BG11 (nitrate rich), BG11 (nitrate poor) and wastewater from carpet effluent (CE). The algal species utilized in the present experiment were Anabaena sp., Chlorella sp., Oscillatoria sp., Nannochloropsis sp., Scenedesmus sp., Phormidium sp., and their synthetic consortia. The water parameters analyzed were dissolved oxygen (DO), water conductivity, pH and concentrations of nutrients (nitrates, phosphates, nitrites). We observed that Chlorella sp. produced maximum biomass of 2.217±0.126 g.L in BG11 media followed by Anabaena sp. 1.897±0.045 for BG11 media and 1.233±0.29 g.L for synthetic consortia of BG11 media. On other hand, biomass yields of 1.233±0.017 and 0.460±0.010 g.L were obtained respectively for consortia in the nitrate deficient BG11 media and CE water. Consequently, with inoculation of consortia in BG11 and CE media nitrate level was increased by 295.27% (748.08 mg.L) and 123.14% (1.33 mg.L) respectively, while decreased in BG11 by 68.91% (5.1 mg.L ). Nitrite concentration was enhanced up to 35.52, 0.038 and 0.028 mg.L in BG11, BG11 and CE respectively. In contrast, with inoculation of the consortia, the phosphate levels were found to be depleted by 35.35% (1.31 mg.L) in BG11, 95.72% (3.64 mg.L) in BG11 and 94.97% (1.7 mg.L) in CE respectively. The range of pH value and DO for different media was found between 8.25–8.87 and 6.14–10.54 mg.L respectively, and conductivity was increased with the growth of algae. The study suggests that beneficial algae and their consortia can be logically selected for biomass production and for improving the water quality.

Change in physico-chemical character of nutrient media and carpet effluent in presence of six algae monocultures and their consortia