Assessment of anaerobic membrane distillation bioreactor hybrid system at mesophilic and thermophilic temperatures treating textile wastewater. (April 2022)

• Record Type: Journal Article
• Authors: Manzoor, Kamran; Khan, Sher Jamal; Yasmeen, Maria; Jamal, Yousuf; Arshad, Muhammad
• Is Part Of: Journal of water process engineering. Volume 46(2022)
• Publication Date: 2022-04
• Subjects: Anaerobic membrane distillation bioreactor -- Textile wastewater treatment -- Mesophilic temperature -- Thermophilic temperature -- Membrane wetting; Water-supply engineering -- Periodicals; Saline water conversion -- Periodicals; Seawater -- Distillation -- Periodicals; Sanitary engineering -- Periodicals; Sewage -- Purification -- Periodicals; 627
• DOI: 10.1016/j.jwpe.2022.102603
• Languages: English
• ISSNs: 2214-7144

Abstract

Abstract: The performance of a lab-scale anaerobic membrane distillation bioreactor (An-MDBR) system was evaluated treating high-strength synthetic textile wastewater with a Chemical Oxygen Demand (COD) concentration of 3000 ± 130 mg/L. A novel hybrid process incorporating membrane distillation in a submerged anaerobic membrane bioreactor was developed at mesophilic and thermophilic temperatures and instigated. The An-MDBR process attained 99.99% inorganic salt rejection irrespective of the operating temperatures and high initial flux between 5.9 and 11.5 L/m 2 ·h (LMH) at 35–50 °C. Removal efficiencies (%) of COD and color were in the range of 40–69% and 43–74%, respectively in an anaerobic bioreactor, whereas overall MD performance was in the range of 99 ± 0.9% for COD as well as color. Among the four temperatures, 40 °C exhibited the optimum performance for 47 days with the average COD and color removal efficiencies of 99 ± 0.9%, respectively with steady biogas production. Furthermore, the conductivity of An-MDBR was maintained at 4.0 ± 0.5 mS/cm using low-cost Woven Fiber Microfiltration (WF-MF) coupled with An-MDBR and the flux was optimized at 2 LMH. The removal efficiency of NH4 +1 -N was greater in the range of 89 to 93% at mesophilic temperatures while smaller in the range of 79 to 86% at thermophilic temperatures by maintaining pH between 6.8 and 7.2. The concentration of PO4 −3 -P in the permeate water was near zero, showing that PO4 −3 can be rejected completely by the MD membrane. Due to membrane biofouling and scaling, wetting was observed for different durations at different temperatures. Graphical abstract: Unlabelled Image Highlights: Efficacy of An-MDBR investigated at mesophilic and thermophilic temperatures Conductivity maintained by woven fiber micro filtration (WFMF) membrane in An-MDBR Stable long-term continuous process achieved at mesophilic temperature of 40 °C Delayed membrane wetting at mesophilic temperature of 40 °C Thermophilic temperatures significantly affected water flux due to wetting.