Produção Nacional
Revisado por pares
Tratamiento de efluentes del cultivo de Litopenaeus vannamei por sedimentación y filtración por la ostra Crassostrea rhizophorae
2008; Escuela de Ciencias del Mar, Facultad de Recursos Naturales, Pontificia Universidad Católica de Valparaíso; Volume: 36; Issue: 2 Linguagem: Inglês
10.4067/s0718-560x2008000200006
ISSN0718-560X
AutoresRoberto Ramos, Luis Vinatea, Rejane Helena Ribeiro da Costa,
Tópico(s)Aquaculture Nutrition and Growth
ResumoEfficiency in removing particulate matter and dissolved nutrients from Litopenaeus vannamei shrimp farming effluents was evaluated at laboratory scale employing a combined two-stage system of sedi- mentation and filtration by the oyster Crassostrea rhizophorae; three hydraulic residence times (HRT) were used: 6, 12, and 24 h. For the sedimentation process, 100-L tanks were filled with 90 L of the effluent. For the filtration process, 50-L tanks were filled with 20 L of the effluent supernatant corresponding to each HRT of the sedimentation stage. All experimental units were seeded with 15 adult oysters with a mean weight of 80 g and a biomass of 1200 g tank -1 . One tank with empty oyster shells was used as a control for each HRT. The re- sults showed that, in the sedimentation process, the best performance was obtained at 24 h, with 56.1% re- moval by turbidity, 36.3% by total volatile solids, 31.0% by BOD5, and 21.4% by ammonium. In the filtration process, removal efficiency was highest at 6 h, with 62.1% removal by turbidity, 69.4% by total suspended solids, 35.4% by total volatile solids, 100% by chlorophyll a, and 17.2% by BOD5, when compared with the control tank. In the filtration process, the ammonium concentration increased for all HRTs. The integrated re- moval efficiency for the sedimentation and filtration processes showed significantly improved performance at
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