Assessment of wastewater treatment efficiency from environmentally friendly catfish farming model

Abstract

    Biofloc technology (BFT) was carried out and operated for purpose of assessing the pollutants removal efficiency by catfish farming model (Pangasianodon hypophthalmus). In the recirculating model biofloc, the studying added carbohydrates to promote the balanced and diverse development of microorganisms. The studying results showed that stable levels of organic compounds and nutrients such as nitrogen, phosphorus were good. The biofloc technology's average treatment of BOD5 was equal to 21.4% (SD=12.11). The removal efficiency of COD was ranged between 10.6% and 67.2%, and averaged 32.2% (SD=12.14). The average treatment efficiency of TN, TP were 28.9% (SD=27.79) and 11.0% (SD=4.28, respectively. Overall, the nitrogen treatment levels were better than the phosphorus removal ability. In the experiment, average values of treated water quality parameters models met QCVN 40:2011/BTNMT National Technical Regulation on industrial wastewater (Columm A). Therefore, the biofloc technology's advantages can be applied for environmentally friendly and sustainable aquaculture.