Recirculating Aquaculture System: Microbial Treatment of Aquaculture Waste Water for Plant Irrigation

 
 
International Journal of Biotech Trends and Technology (IJBTT)
 
© 2019 by IJBTT Journal
Volume - 9 Issue - 1                          
Year of Publication : 2019
Authors : Divyadharshini.T, Aishwariya.R, Abinaya Priya.M and Mariaamalraj. S

MLA Style: Divyadharshini.T, Aishwariya.R, Abinaya Priya.M and Mariaamalraj. S "Recirculating Aquaculture System: Microbial Treatment of Aquaculture Waste Water for Plant Irrigation" International Journal of Biotech Trends and Technology 9.1 (2019): 22-25.

APA Style: Divyadharshini.T, Aishwariya.R, Abinaya Priya.M and Mariaamalraj. S (2019). Recirculating Aquaculture System: Microbial Treatment of Aquaculture Waste Water for Plant Irrigation International Journal of Biotech Trends and Technology, 9(1), 22-25.

Abstract

Aquaculture has been considered as an option to cope with the world food demand and India is the 2nd largest producer of aquatic animals globally. Though the Indian fisheries and the aquaculture serves as a major sector in food production it also has its own negative impact on the fishes and the environment. One of the environmental impacts that receives the most attention is the issue of nutrient depletion and effluent buildup. Ammonia is one of the major compound present in the effluent which results in toxicity. For every ton of fish, aquaculture operations produce between 42 and 66 kilograms of nitrogen waste. In the present study, the recirculating of aquaculture wastewater is done by converting the ammonia (NH3+) content to harmless nitrogen gas (via nitrite)with the aid of Nitrifying and Denitrifying bacteria which was isolated from the rhizosphere soil. Both the cell free supernatant and cells has the ability of reducing ammonia. The wastewater was collected from the aquaculture industry, Madurai, which contains 17μg/mL of ammonia, BOD –42 mg/L and COD – 96 mg/L. The ability of nitrifying and denitrifying bacteria on the simulated aquaculture waste water was analyzed. For nitrification, the cell free supernatant reduces 96.35% ammonia at 90th min. On the other hand, the cells reduce 90.98% ammonia at 210th min. In case of denitrification process, the cells reduce 30% nitrate content at 90th min whereas the cell free supernatant reduces 67.6% nitrate content at 180th min. The ability of immobilized crude enzyme and the cells were studied periodically. The aquaculture wastewater was treated and the characteristics of the treated simulated water were analyzed. The treated water can be used for irrigation purposes.

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Keywords
Aquaculture waste water, Recirculating aquaculture system, nitrification, denitrification, bacteria.