BIOREMEDIATION OF MUNICIPAL WASTEWATER USING MACROALGA GENUS GRACILARIA
Huge amounts of wastewater release large amounts of nutrients into aquatic ecosystems and can lead to eutrophication of coastal waters. Studies conducted in aquaculture systems have demonstrated that seaweeds are efficient in reducing nutrients and at the same time provide extra income, when species of economic importance are used. This application may be expanded for municipal wastewater. This study was conducted to evaluate whether Gracilaria could be cultivated efficiently for the production of useful algal biomass and removal of nutrients from municipal wastewater effluents. The results obtained showed a gradual increase in biomass and relative growth rate (RGR) over the experimental period. Mean RGR between the weeks varied significantly (p<0.01), reaching a maximum of 3.6±0.35% d-1 and a minimum of 1.6±0.52% d-1. The mean for the whole period was 2.6% d-1. The biofiltration capacity of Gracilaria was confirmed by the significantly reduced concentration of the three nutrients analyzed (PO43-, NH4+ and NO3-) over the study period. The concentration of PO43- decreased by 93.5%, NH4+ by 34% and NO3- by 100% after the 4-week experimental period. The results obtained in this study indicated that Gracilaria can be used as a biofilter. In addition, the macroalgae biomass produced offers an alternative source of raw material for the extraction of the phycocolloid agar, human food and animal feed.
Lababpour, A. (2014). BIOREMEDIATION OF MUNICIPAL WASTEWATER USING MACROALGA GENUS GRACILARIA . Acta Hortic. 1054, 215-219
wastewater treatment, nutrient removal, process optimization, nitrogen and phosphate removal, biofilter, macroalgae cultivation