Development of labor filtration system for recirculating aquaculture system
2009
Amongo, R.M.C., Philippines Univ. Los Baños, College, Laguna (Philippines). Agricultural Power and Machinery Div. | Resurreccion, A.N. | Ella, V.B. | Bato, P.M. | Poras, F.O. Jr | Zubia, O.F. | Casas, E.V., Philippines Univ. Los Baños, College, Laguna (Philippines). Inst. of Agricultural Engineering
The study aimed to develop a low-cost and efficient lahar filtration system for recirculating aquaculture system. The filtration system was composed of the settling tank, the mechanical filter and the biological filter with lahar as filter media. The system was attached to a culture tank with tilapia (Oreochromis niloticus) as fish culture and its efficiency was determined using the Box and Behnken three level-incomplete factorial design. Fifteen experimental runs were conducted to determine the system's efficiency. Results showed that as the wastewater moved from the settling tank to the biological filter, decrease in TDS [total dissolved solids] (1.82%), TSS [total suspended solids] (79.17%), NH3 (71.68%) and NO2 (61.08%) were observed. On the other hand, temperature (0.44%), pH (3%), DO [dissolved oxygen] (44.35%) and nitrate concentration (34.46%) were increased. Except for NH3, which was significantly affected by % feeding rate, the recirculated water to the culture tank met the permissible water quality limits for culturing tilapia. The cost effectiveness of the system was determined with a payback period of 2.33 years, breakeven point of 1.31 cropping per year, benefit cost ration of 1.06 and internal rate return of 39.02% which showed its financial viability.
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