Abstract
Two photobioreactors inoculated with microalgae from a lagoon containing aerobically treated swine slurry and with sludge from a membrane submerged bioreactor treating winery wastewater were established to treat fish processing wastewater (FPW) at 23 and 31°C, respectively. The hydraulic retention time (HRT) was decreased in the photobioreactors from 10 to 5days. Ammonium was completely exhausted in both photobioreactors; however, volatilization was the main removal mechanism for the highest applied load whereas biomass assimilation was the main mechanism for the lowest applied load. Approximately 70% of TCOD (total chemical oxygen demand) and phosphate removal was achieved regardless of temperature. Biomass productivity was as much as 55% higher at 31°C than at 23°C. These results suggested that fish processing wastewater could be effectively treated using this technology.
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