Semi-continuous production of volatile fatty acids from citrus waste using membrane bioreactors


Lukitawesa L., Eryildiz B., Mahboubi A., Millati R., Taherzadeh M. J.

INNOVATIVE FOOD SCIENCE & EMERGING TECHNOLOGIES, cilt.67, 2021 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 67
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1016/j.ifset.2020.102545
  • Dergi Adı: INNOVATIVE FOOD SCIENCE & EMERGING TECHNOLOGIES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Biotechnology Research Abstracts, CAB Abstracts, Compendex, Food Science & Technology Abstracts, Veterinary Science Database
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

In the production of volatile fatty acids (VFAs) from citrus waste, organic loadings rates (OLR) from 1 to 8 g VS/ L?d were applied in semi-continuous anaerobic fermentation using a tubular membrane bioreactor (MBR). Filtration fluxes of the membrane were in the range of 7.9?8.5 L/m2?h. trans-Membrane pressure (TMP) revolved around 24.1?67.5 mbar. No obvious fouling and clogging occurred. The highest yield of VFAs 0.67 g VFA/g VS (volatile solids) was achieved at OLR 4 g VS/L?d. When citrus waste was pretreated to remove D-limonene using an airlift reactor, the highest yield of VFAs 0.84 g VFA/g VS was also obtained at OLR 4 g VS/L?d. A further increase in OLR of up to 8 g VS/L?d caused a sharp decrease in yield for the untreated citrus waste and only marginal changes were observed for the pretreated citrus waste. The main composition of VFAs was acetate, butyrate, caproate, and propionate.