Abstract
Sulfate can be presented as a chemical pollutant in some industrial wastewaters such as wastewater from power plants. Sulfate causes several problems in water and wastewater treatment including the corrosion of pipes and disruption of anaerobic processes. There are chemical, membrane, and biological methods to omit sulfate pollutant from wastewater. Microalgae have the dual role in wastewater treatment and biodiesel production. In this study, microalgae were used to reduce sulfate pollutant and to produce biomass from the combined-cycle power plant wastewater (5200 mg/L sulfate concentration). To do so, the growth of five microalgae (Chlorella sp., Chlamydomonas sp., Oocystis sp., Scenedesmus sp., and Fischerella sp.), production of biomass, and elimination of sulfate were evaluated in a batch culture system. Results indicated that microalgae can reduce the amount of sulfate pollutant and produce biomass. In addition, it was found that Oocystis sp. had a higher sulfate uptake rate (32%) than other microalgae. However, maximum biomass productivity was found to be 50 mg/L.d for Chlorella sp. Finally, the results showed that microalgae can be used to treat wastewater for sulfate reduction and production of microalgae biodiesel.
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