Feasibility of nanofiltration process for high efficient recovery and concentrations of food waste-derived volatile fatty acids


Pervez M. N. , Mahboubi A., Uwineza C., Sapmaz T., Zarra T., Belgiorno V., ...More

JOURNAL OF WATER PROCESS ENGINEERING, vol.48, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 48
  • Publication Date: 2022
  • Doi Number: 10.1016/j.jwpe.2022.102933
  • Journal Name: JOURNAL OF WATER PROCESS ENGINEERING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, INSPEC
  • Keywords: Waste biorefinery, Food waste, Circular economy, Anaerobic membrane bioreactor, Volatile fatty acids, Nanofiltration, ANAEROBIC-DIGESTION, PHOSPHORUS REMOVAL, REVERSE-OSMOSIS, ORGANIC-MATTER, FLUX DECLINE, WATER, MEMBRANE, ULTRAFILTRATION, MANAGEMENT, SEPARATION
  • Istanbul Technical University Affiliated: No

Abstract

Various methods exist for the recovery of volatile fatty acids from organic mixed waste effluents, and among them, the membrane filtration process holds a great promise over other recovery methods due to their simplicity, sustainability and high efficiency. Hence, in this study, nanofiltration experiments were carried out using two commercial nanofiltration membranes of 200-300 Da and 300-500 Da under various pH (4, 5.4, 7 and 9) at constant pressure (15 bar) and temperature of 20-21 degrees C in order to achieve a higher amount of volatile fatty acids from the real mixed food waste-based effluent. Results showed that solution pH plays an important role in the physicochemical parameters such as total solids removal rate was above 80 % at pH 4, chemical oxygen demand, ammonia and phosphorus removed to some extent at pH 9. Subsequently, the concentration and recovery percentages of volatile fatty acids increased with solution pH 9; in particular, lower molecular weight cut-off membrane, i.e., 200-100 Da, appeared to be more effective with an increased concentration of total volatile fatty acids (16.94 g L-1) and recovery percentage above 90 % at pH 9. Membrane performance was also evaluated and correlated with recovery performance in terms of permeate flux reduction at lower pH. An important finding of this study was the concentration and recovery percentages of volatile fatty acids reached around 96 % after 3rd cycle by conducting a repeated sequencing nanofiltration process, which was identified as a promising option to enhance the recovery percentages of volatile fatty acids.