Assessing the treatment behavior of municipal wastewater by a modified USBF bioreactor

In this article, the performance of a modified USBF is investigated in a pilot scale at a capacity of 2250L for treating municipal wastewater. The raw wastewater is entered in the bioreactor with a chemical oxygen demand (COD) concentration of 220020 mg/l. The reactor is studied under different suspended biomass concentrations of about 3000, 4000 and 5000 mg/l and different total hydraulic retention times (HRT) 4, 8 and 12 hr. The Lawrence -McCarthy model is used to determine the biokinetic coefficients of COD removal behavior. The system has a more favorable efficiency about 249, at the suspended biomass concentration of about 5000 mg/l, OLR of 1725 kg COD/m 3 .day and HRT of 4 hr. The investigation showed that the yield coefficient (Y), decay coefficient (kd), μmax and saturation constant (Ks) were in the range of 073868-074203 mgVSS/mg COD, 070326-07062 1/day, 1736-172222 1/day and 225752-445733 mg sCOD/L.

Keywords:

bio-kinetic coefficients , domestic wastewater , USBF , wastewater treatment