Use of Chlorella vulgaris microalgae in the treatment of dairy wastewater

Khalaji, M; Hiseini, SA; Ghorbani, R; Agh, N; Rezayi, H

Volume 12, Issue 2 (9-2019) ijhe 2019, 12(2): 307-318 | Back to browse issues page

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Khalaji M, Hiseini S, Ghorbani R, Agh N, Rezayi H. Use of Chlorella vulgaris microalgae in the treatment of dairy wastewater. ijhe 2019; 12 (2) :307-318
URL: http://ijhe.tums.ac.ir/article-1-6198-en.html

Use of Chlorella vulgaris microalgae in the treatment of dairy wastewater

M Khalaji ^*

¹, SA Hiseini²

, R Ghorbani²

, N Agh³

, H Rezayi⁴

1- Department of Aquatic Production and Exploitation, Faculty of Fisheries and Environment, Gorgan University of Agricultural Sciences and Natural Recourses, Gorgan, Iran , mahtabkhalaji24@gmail.com
2- Department of Aquatic Production and Exploitation, Faculty of Fisheries and Environment, Gorgan University of Agricultural Sciences and Natural Recourses, Gorgan, Iran
3- Artemia and Aquaculture Research Institute, Department of Biology and Reproduction, Faculty of Fisheries, Urumieh University, Urumieh, Iran
4- Department of Environment, Faculty of Fisheries and Environment, Gorgan University of Agricultural Sciences and Natural Recourses, Gorgan, Iran

Abstract: (3154 Views)

Background and Objective: Nutrient-rich effluents (mainly nitrogen and phosphorus) may lead to algae blooms and many harmful effects in aquatic environments. Micro-algae have been more effective among the various methods used for the removing of nutrients from wastewater. Microalgae Chlorella vulgaris has specific characteristics such as rapid growth, resistant to systems manipulation, simple and inexpensive production technology, as well as the rapid uptake of nutrients such as phosphate and nitrate.
Materials and Methods: In the present study, two concentrations of chlorella vulgaris microalgae (13 and 26 million cells/mL) were injected into dairy effluent, diluted using distilled water by 25, 50 and 75%, and the amount of nutrient removal and microalgae growth were examined during the growth period.
Results: Results indicated that different concentrations of algae at various percentages of dilution (25, 50, 75%) had a significant effect on the removal of nutrients and algal growth (p<0.05). The absorption of nutrients (nitrate, phosphate and ammonia) were 57.01, 51.84 and 43.15 percent respectively that containing lower density of initial algae compared to the treatments of 2nd group (29.15, 51.84 and 43.15 percent) with higher algae concentration. In both algal concentrations, the highest percentage of phosphate and ammonia adsorption were in dilution of 25% effluent and the highest percentage of nitrate adsorption were in the first group with 50% dilution and in the second group with 75% dilution.
Conclusion: The more percentage of nutrients (nitrate, phosphate, ammonia) was eliminated compared to the second group (26 million cells / mL) when the microalgae concentration (group I) was 13 million cells / mL. Absorption of nutrients was decreased by increasing the concentration of microalgae. Regarding to the percentage of nitrate adsorption, the higher absorbance in the dilution was occurred at the highest concentration of algae.