Bioremediation of shrimp biofloc wastewater using clam, seaweed and fish. Issue 10 (26th November 2018) - Brito, Luis Otavio
ABSTRACT: The aim of this study was to evaluate the bioremediation of effluents in the biofloc culture of shrimp juveniles using clams, seaweed and fish. Four treatments were considered: CLT – without bioremediating organisms; AB – using Anomalocardia brasiliana ; GB – using Gracilaria birdiae and ON – using Oreochomis niloticus with 2.5 kg wet weight per m 3 of shrimp effluent. In the AB treatment, significant differences were observed in the effluent at the end of the experiment (96 h) for values of nitrite-nitrogen, nitrate, alkalinity, TSS and orthophosphate. The ISS and VSS levels recorded for the AB treatment varied respectively from 336 to 127 mg L −1, and from 505 to 130 mg L −1, with a corresponding gradual reduction of approximately 62% and 74% at the end of the experiment. The use of a clam species to treat effluents in a biofloc system with salinity near 25 g L −1 reduced waste solids and increased the nitrification process from 72 to 96 h, indicating that this clam can be used as a bioremediator and contributes to effluent treatment in shrimp.