Aquaculture Wastewater Treatment by Using Three Phase Fluidized Bed Process with Draft Tube

Abstract

The objectives of this research were to evaluate the optimum treatment conditions of the three phase fluidized bed with draft tube for the aquaculture wastewater treatment, and thereby reduce the volume of treatment process. Three phase fluidized bed process with draft tube had more effective than traditional methods for reducing ammonia in the culture system, which can results in the reduction of the water treatment tank volume. When Oreochromis niloticus was reared, the unit production of pollutants were 0.07g NH₄⁺-N · kg fish^-1 · d^-1 and 0.06g PO₄^3--P · kg fish^-1 · d^-1, and sludge production rate was 0.39g SS · kg fish^-1 · d^-1. The maximum removal rates of COD and ammonia were 1,200 mg · l^-1 · d^-1 and 488 mg · l^-1 · d^-1, respectively. Ammonia removal rates were more than 90% during HRT of 1hours. In the three phase fluidized bed, the volume of water treatment tank could be calculated from an empirical equation by using the relationship between the influent COD to NH₄⁺-N ratio (C/N), media concentration (C_m, g · l^-1), influent ammonia nitrogen concentration (N₁, mg · l^-1), effluent ammonia nitrogen concentration (N_e, mg · l^-1), and influent flowrate (Q, m³ · hr^-1). The empirical equation from was obtained from this study.
V=10^11.7507 C/N^-1.2330 C_m^-6.5715 N_i^1.5091 N_e^-1.8489 Q