Beet sugar wastewater treatment in the hybrid biological reactor: Operational optimization and kinetic coefficients calculation

Document Type : Research Paper


1 University of Isfahan

2 Chemical & Petrolium Engineering Department, Sharif University of Technology, Tehran, Iran


The lab-scale treatment of strong beet sugar wastewater was carried out in the combination of a moving bed biofilm reactor (MBBR) and an up flow sludge blanket filtration (USBF). The hybrid bioreactor was filled (35% of volume) with industrial packings made of polyethylene with an effective surface area 480 m2/m3 to provide the necessary surface for biofilm growth. The effect of various operating conditions including hydraulic retention time (HRT = 12-20 hr), biomass concentration (6000– 8000 mg/L), and initial COD (3000-5000 mg/L) level were assessed on the overall COD removal efficiency using the response surface methodology (RSM). The optimal conditions were found to be HRT = 20 hr, biomass concentration = 8000 mg/L, initial COD = 3000 mg/L and organic loading rate (OLR) 3.6 kg COD/, under which COD removal efficiency was 98%. The modified Stover–Kincannon model was applied to predict the biokinetic coefficients for COD removal; the saturation constant (KB ) and the maximum total substrate utilization rate (Umax) were in the range 58-101.6 and 57.5- 97 as g/, respectively. The results revealed that raising HRT or biomass concentration would promote COD removal while increasing the initial COD deteriorates the removal performance.


Main Subjects

Articles in Press, Accepted Manuscript
Available Online from 18 October 2023
  • Receive Date: 11 June 2023
  • Revise Date: 17 October 2023
  • Accept Date: 18 October 2023
  • First Publish Date: 18 October 2023