Influence of desalinator wastewater for the cultivation of Arthrospira platensis.Fatty acids profile

摘要

The need for a desalination processes in northeastern Brazil is due to the salinity of its water sources.However,these processes produce residues with high saline concentrations and a significant environmental impact.These wastewaters can be used for Arthrospira platensis cultivation.This work aimed to cultivate Arthrospira platensis in three different media:Paoletti Synthetic Medium (PSM),Salinated Water Medium (SWM) and Desalinator Wastewater Medium (DWWM).Microalgae were cultivated under controlled conditions,in 4 L photobioreactors,30±1°C,12 hours of light/dark photoperiod provided by fluorescent lamps at a light intensity of 140 mu mol·m-2·s-1 and constant bubbling of air (0.5 L·L-1·min-1).The effect of different media on cell concentration,productivity,total content of lipids and fatty acids profile was verified.Higher cell concentration,as well as higher productivity was observed in DWWM:4.954 (±0.554) g·L-1 and 0.225 (±0.042) g·L-1·day-1,respectively.Concerning total lipids,the contents of 4.54% and 4.69% were observed in DWWM and SWM,respectively.High levels of saturated fatty acids were observed in both treatments.Concerning gamma-linolenic acid,the contents of 13.09% (DWWM) and 11.95% (SWM) were found.