Efficiency of cyanobacterium Spirulina in removal of orthophosphates from simulated municipal wastewater
Subject Areas : Marine ChemistryS. Jafari 1 , A. A. Hosseini 2
1 - Chemical Engineering Dept., Faculty of Engineering, Islamic Azad University of Tehran North Branch
2 - Faculty of Engineering, Islamic Azad University, Central Tehran Branch
Keywords: sewage, Spirulina, micro-algae, orthophosphates,
Abstract :
In this study the efficiency of bioreactors containing Spirulina algae in removal of orthophosphates from municipal wastewater was investigated. Physical factors such as light, temperature, pH, agitation and aeration, and chemical factor such as culture medium can be an important factor influencing the growth of micro-algae. Spiral Helical photobioreactor and Zarrouk medium as culture medium were used for the removal of phosphorus from municipal wastewater. Microalgae stabilized in the culture medium with different amounts of air (zero and 1.3 L/ min) were added to 4.5L municipal wastewater in photobioreactor. The concentration of orthophosphates absorbed was measured by a spectrophotometer (DR/4000 HACH) at different time intervals. In an 18-day period, performance of the bioreactor containing Spirulina algae in removal of orthophosphates from municipal wastewater was studied. The results showed that without aeration, orthophosphate concentration of 38.46 mg / L reduced to 11.54 mg/L. Aeration flow of 1.3 L/min reduced orthophosphate concentration from 60gr/Lit to 20gr/L. In other words, the bioreactor containing Spirulina algae, had an efficiency of 69.9% for the removal of orthophosphates, without aeration, and an efficiency of 80%, with aeration (flow rate of 1.3 L/min) (The percentages quoted are average of three replicates).
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