Investigation of acetone adsorption characteristics of activated carbons obtained from Zonguldak-Karadon coal at room temperature


Erdogan F. , Kopac T.

JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY, vol.35, no.4, pp.2211-2224, 2020 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 35 Issue: 4
  • Publication Date: 2020
  • Doi Number: 10.17341/gazimmfd.686415
  • Title of Journal : JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY
  • Page Numbers: pp.2211-2224
  • Keywords: Coal, activated carbon, chemical activation, volatile organic compounds, acetone adsorption, VOLATILE ORGANIC-COMPOUNDS, VAPOR ADSORPTION, POROUS CARBON, TOBACCO STEM, COMPOUND VOC, HYDROGEN, SORPTION, SURFACE, ADSORBENT, EQUILIBRIUM

Abstract

Propionibacterium freudenreichii has been successfully applied to industrial anaerobic production of vitamin B-12. In the traditional fed-batch fermentation process, 5,6-dimethylbenzimidazole (DMB) is used as a precursor. However, DMB can inhibit the synthesis of vitamin B-12 metabolic intermediates, which is not conducive to semicontinuous fermentation of P. freudenreichii. To improve the fermentation efficiency, vitamin B-12 ex-situ biosynthesis was proposed and a membrane separation coupling fermentation technology was designed with adenosylcobinamide (Ado-cbi) as the indicator signal. The results showed that P. freudenreichii cells should be partly separated online at 84 h with 0.22-mu m spiral membrane. The fourfold concentrated suspension was suitable for ex-situ biosynthesis of vitamin B 12 with the addition of 3.60 mg L-1 DMB at 30 degrees C and pH 7.0. In the semi-continuous coupling fermentation process, vitamin B-12 concentration reached 56.76 +/- 3.86 mg L-1, an improvement of 161.6 %, while reutilizing fermentation wastewater and improving the anaerobic fermentation efficiency of P. freudenreichii.