LUO Jin,FANG Qian,ZENG Yun-yi,et al.Effect of Oil Content on Directional Production of OCFA from Hogwash Waste Grease[J].China Water & Wastewater,2021,37(3 3):24-31.
Effect of Oil Content on Directional Production of OCFA from Hogwash Waste Grease
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
3 3
Page:
24-31
Column:
Date of publication:
2021-02-01
- Keywords:
- oil content; odd carbon volatile fatty acid (OCFA); hogwash waste grease; anaerobic fermentation
- Abstract:
- The odd carbon volatile fatty acids (OCFA), as intermediate metabolites in anaerobic digestion, are important carbon sources for the synthesis of polyhydroxyalkanoates (PHAs) and biological nutrients removal (BNR). To increase the proportion of OCFA in the anaerobic fermentation broth of hogwash waste grease, the effect of oil content in hogwash waste grease on the directional production of OCFA by anaerobic fermentation was studied. The changes of volatile fatty acid (VFAs) concentration and OCFA proportion (OCFA/VFAs) and their effects on dissolved chemical oxygen demand (SCOD), soluble protein and polysaccharides during fermentation were studied with waste fat in hogwash waste grease as fermentation substrate, slops oil slick and frying waste oil as additives, and excess sludge at the end of the anaerobic tank as inoculum. The changes of VFAs concentration and OCFA proportion (OCFA/VFAs) in the case of oil content 0-20 g/L were discussed respectively. The results showed that when the oil content was 10 g/L, the VFAs concentration and the highest proportion of OCFA were increased, compared with the oil content of 0 g/L, increased by 57.6% and 5.9% respectively. And the best fermentation conditions were determined by response surface method that fermentation time was 7.6 days, oil content was 11.2 g/L, and the highest proportion of OCFA was 73.5%.
Last Update:
2021-02-01