Performance evaluation and substrate removal kinetics in an up-flow anaerobic hybrid membrane bioreactor treating simulated high-strength wastewater

Abstract

The prime objective of the present study is to evaluate the performance of novel up-flow anaerobic hybrid membrane bioreactor (An-HMBR) treating high-strength wastewater (synthetic) using polyurethane foam as filter media. Treatment efficiency of the entire An-HMBR varied from 88-97% corresponding to 0.67-3.90 d of hydraulic retention time (HRT) with organic loading rate of 6.4-1.06 kg COD m d. The modified Stover-Kincannon model was the most appropriate model for An-HMBR and anaerobic hybrid bioreactor (excluding membrane). The suspended growth system in An-HMBR could be described by both modified Stover-Kincannon and Grau second order model. The attached growth system in An-HMBR followed conventional Monod's kinetics. A novel combination of suspended, attached and membrane in single reactor increased the solid retention time to as high as 756 d at 3.9 d HRT which not only improved the COD removal efficiency but also enhanced the performance of the membrane.

Performance evaluation and organic mass balance for treatment of high strength wastewater by anaerobic hybrid membrane bioreactor

“…The synthetic wastewater composed of different nutrient sources, along with macro and micronutrients, essential for optimum growth of anaerobic microbes present in the sludge inoculum. The synthetic wastewater concentration has been opted from our previous study, which consisted of carbon, nitrogen, and phosphorus source with COD of 3.2 g/L along with some added minerals. COD:N:P ratio of 320:10:1 was maintained in the feed wastewater.…”

“…The estimation of COD for MLVSS was achieved by considering the ratio of 1.42 g COD gVSS −1 The value was calculated on the basis of daily biogas generation, the concentration of methane in the biogas, the molar volume of the gas (based on tentative temperature), and the mole of methane equivalence of 64 g COD mol CH 4 −1 . The value of yield coefficient was taken from the previous study …”

“…The synthetic wastewater concentration has been opted from our previous study, 17 which consisted of carbon, nitrogen, and phosphorus source with COD of 3.2 g/L along with some added minerals. COD:N:P ratio of 320:10:1 was maintained in the feed wastewater.…”

“…19,20 The value of yield coefficient was taken from the previous study. 17 Henry's law was applied for the estimation of dissolved methane concentration assuming equilibrium with the gas phase. The value of Henry's constant (K H ) was adopted as 0.0014 M liq bar gas −1 on 25 C which is representative of molarity in the liquid phase over partial pressure, P, in the gas phase Equation (2) 19,20 :…”

Efficiency Limiting Factors of Petrochemical Wastewater Treatment Using Hybrid Biological Reactor

“…Anaerobic wastewater treatment has been increasingly used recently, and, in the past few years, a number of experimental studies aimed at improving the performance of the anaerobic treatment process have been reported (Wang et al, 2019;Shoukat et al, 2019;Burman & Sinha, 2020). In anaerobic treatment, the organic matter is transformed by microorganisms into biogas (primarily methane and carbon dioxide) in the absence of oxygen.…”