Possible application of alcohol factory effluent and its removed suspended solids at different concentrations for production of green microalga Scenedesmus quadricuada

Document Type : Research Paper

Authors

Department of Natural Resources, Isfahan University of Technology, Isfahan, Iran.

10.22059/jfisheries.2025.391120.1451

Abstract

This study investigated the green microalga Scenedesmus quadricauda in alcohol factory effluent to determine cell density, growth, algal biomass, and bioremediation potential. The experiment carried out with seven treatments including; effluent at concentrations of 1%, 5% and 10% (v/v), effluent without suspended solids at the same concentrations 1%, 5% and 10%, and a control treatment using BBM medium. Each treatment was conducted in triplicate over 14 days in a completely randomized design. Algal cell density and growth rates ranged from 1.03×106 to 5.85×105 cells/mL and from 0.039 to 0.153 per day, respectively. The highest biomass production of 4777.5 mg/L was observed in the 1% effluent treatment, while biomass ranged from 1704.2 to 4198.6 mg/L in other treatments. At higher concentrations (5% and 10%), total suspended solids had no significant effect on biomass production; however, at a 1% concentration, the treatment containing suspended solids showed higher biomass production (P<0.05). Significant removal of phosphate and nitrate occurred across all treatments (P<0.05). The highest nitrate (96.45%) and phosphate (90.83%) removal efficiencies were observed in the 1% effluent treatment without suspended solids. The highest BOD5 removal efficiency (95.01%) and the highest COD removal efficiency (98.13%) both in was achieved in the 10% alcohol effluent treatment.

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References

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Journal of Fisheries
Volume 78, Issue 2
July 2025
Pages 135-147

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