Reduction of High Organic Loading of Industrial Wastewater Using Green Algae (Spirogyra Sp.) and Blue- Green Algae (Oscillatoria Sp. and Anabaena Sp.)

Document Type : Research Paper


1 Associate Professor of Biology Dept., University of Isfahan

2 Assistant Professor of Biology Dept., Azad University of Falavarjan

3 Professor of Biology Dept., University of Isfahan


In this research the effects of algae on reduction of organic loading of industrial wastewaters were evaluated using stabilization ponds. For this reason, the blue-green algae (Oscillatoria sp. and Anabaena sp.) and green algae (spirogyra sp.) were collected, purified, identified and then added to the wastewater samples collected from slaughterhouse, sugar plant and vegetable oil refinery. The wastewater parameters such as pH, BOD5 and COD were measured at four different intervals of 15, 20 and 55 days. The data were analyzed using ANOVA and the Duncan's multiple test range to compare the mean values. The results indicated that the effects of different treatments (wastewater, algae or retention time) and their interactions are not statistically significant on pH of the wastewaters; however, the BOD5 and COD were affected significantly by different treatments and their interactions. Although the BOD5 and COD of treated samples with algae have lower values with respect to BOD5 and COD's of the controls, the Anabanea sp. and Osilatoria sp. are more effective on reducing BODand COD of wastewater compared to spirogyra sp.


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