Tilapia rearing with septic tank-high rate algal pond effluent: domestic wastewater polishing treatment and resource recovery
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In a pilot-scale experiment carried out in Brazil, genetically improved farmed tilapia juveniles were reared in septic tank-high rate algal pond (HRAP) effluent. The combination of three total ammonia nitrogen (TAN) surface loading rates (0.6; 1.2 and 2.4 kg TAN.ha-1.d-1) and three fish stocking densities (3; 6 and 12 fish.m-2) was evaluated during a 22-week research. The fish rearing tanks worked as wastewater treatment polishing units, adding (as the best results, achieved with the lowest fish stocking density and 1.2 kg TAN.ha-1.d-1) the following removal figures on top of those achieved at the HRAP: 78.3% total Kjeldahl nitrogen; 89.1% ammonia nitrogen; 63.9% total phosphorous; 57.2% chemical oxygen demand; 2.36 log units E. coli. Fish productivity was estimated at 2.67 ton.ha-1 for fish culture over six month per year in a temperate climate region, using the domestic treated wastewater natural plankton population as the only food source.
Iván A. Sánchez-Ortiz, Departamento de Recursos Hidrobiológicos, Universidad de Nariño, Pasto, Colombia
https://orcid.org/0000-0001-7579-5969
Rafael Bastos, Departamento de Engenharia Civil, Universidade Federal de Viçosa, Viçosa-Minas Gerais Brazil
https://orcid.org/0000-0001-6781-9617
Eduardo A. Lanna, Departamento de Zootecnia, Universidade Federal de Viçosa, Viçosa-Minas Gerais, Brazil
https://orcid.org/0009-0002-0730-7999
Adriana B. Sales-Magalhães, Centro Universitário de Caratinga (UNEC). Caratinga-Minas Gerais, Brazil
https://orcid.org/0000-0003-3473-4996
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Accepted 2024-01-17
Published 2024-02-26
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