Biotechnology and Bioinformatics (1+1)

6.1.4. Recent studies on treatment of aquaculture waste water

Recently, the concerns of treatment of aquaculture waste water has been increased. So aquaculture wastewater must be treated properly and recirculated back to the system.

• Removal of organic matter and nitrogenous substance in aquaculture wastewater by combining both aerobic and anaerobic biofiltration for nitrification and denitrification in an aquaculture unit with an aerobic trickling filter (for nitrification) and two anaerobic fluidized bed columns (for denitrification) can be done.
• Carbon source for denitrification is the organic carbon produced in the fish culture units (fish feces and unutilized feed) and external organic compound (methanol).
• The maximum removal rate of ammonia by trickling filter was 0.43 g NH₄ – N/ m² / day and maximum nitrate removal rates was around 432 g NO₃ – N / m² / day.

Treatment of aquaculture wastewater can be accomplished by construct ed wetland. The studies have demonstrated that constructed wetlands can efficiently remove the major pollutants from

• catfish, shrimp and milkfish pond effluents,
• including suspended solids, organic matter, nitrogen, phosphorus and phytoplankton.
• Accordingly, a constructed wetland was technically and economically feasible for managing water quality of an intensive aquaculture system.
• It can improve the water quality and provide a good culture environment. a