• 2021-06
• Akinnawo S.O
• Volume 3, Issue 1

Abstract

Effort towards combating water shortages and environmental problems such as eutrophication, which is associated with the indiscriminate discharge of aquaculture wastewater into the environment has resulted in the quest for an efficient aquaculture wastewater treatment system. This paper reviewed the importance and efficiency of chemical precipitation method as well as chemical reduction method in the treatment of aquaculture wastewater. The percentage efficiency of chemical precipitating agents such as aluminium sulphate, calcium oxide and ferric sulphate is dependent on the precipitant dosage and the pH of the solution. On the other hand, chemical reducing reagents such as hydroxylamine hydrochloride and modified chitosan composites have been effective in removing nitrate from wastewater. Nevertheless the percentage efficiency of chemical reducing reagents increases with an increase in initial concentration and contact time but decreases with a decrease in pH and an increase in temperature. Chemical precipitation and reduction methods have been reported to have high removal efficiencies for phosphate and nitrate from aquaculture wastewater.