Bioremediator potential of the microalgae Chlorella vulgaris BEIJERINCK in a wastewater composed medium
Abstract
The groundwater desalination is, in many locations, the only solution for water supply. However, the reverse osmosis membrane desalination process produces a polluting and difficult-to-treat waste. Similarly, the effluent produced by the treatment of domestic sewage in anaerobic filter also needs a post-treatment to meet the standards for discharge into water bodies. Thus, the bioremediation of wastewater, using microalgae, appears as an option for treating this waste. The objective of this study was to evaluate and optimize the bioremediative potential of the microalgae species Chlorella vulgaris in a medium composed of reverse osmosis desalination wastewater and domestic sewage treatment effluent by anaerobic filter and the standard medium of the species. In the methodology, the experimental design was used by central composite rotational design (CCRD), having as independent variables: pH, photoperiod and effluent concentration. The parameters analyzed were Chemical Oxygen Demand (COD) and Total Phosphorus (TP). Removal rates for the COD variable ranged between 28.73 and 70.73% and for the TP variable the rates were between 52.19 and 100%. The statistical optimization of the models showed a combined theoretical removal of 69.08% for COD and 89,34% TP.
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