Volatile fatty acids production from food wastes and its application to biological nutrient removal

Abstract

Korean food wastes were anaerobically digested to produce volatile fatty acids (VFA) that can be used as a carbon source in biological nutrient removal in a sequential batch reactor (SBR). Acetate, propionate and butyrate were produced at a yield of 379±400 g VFA/kg VS 0 (initial volatile solids). The ratio of SCOD (Soluble Chemical Oxygen Demand) of VFA to ammonia nitrogen (N) was in the range of 36.2±36.5 and the ratio of SCOD to phosphorus was between 151 and 162. The removal rate of nitrogen and phosphorus improved from 44% and 37% to 92% and 73%, respectively when the VFA were added to the in¯uent of the Taejon municipal wastewater plant. The concentration of nitrogen and phosphorus were maintained below 3 mg/l and 1 mg/l, respectively. The N-and P-content of the food waste was low enough not to in¯uence the ®nal N-and P-concentrations of the wastewater.

Anaerobic Digestion of Ulva sp. 3. Liquefaction Juices Extraction by Pressing and a Technico-Economic Budget

“…The COD s (about 80% VFA) load was 36 g L −1 . Such a product would interest industry, as an intermediary for chemical synthesis (Schoutteten, 2004), as a substrate for feed production (Pelayo Ortiz et al, 1997) or fermentation (Uchida & Murata, 2004), or as a carbon source for denitrification processes (Xu, 1996;Lim et al, 2000;Elefsiniotis et al, 2004).…”

High rate biomethanation technology for solid waste management and rapid biogas production: An emphasis on reactor design parameters

“…Volatile fatty acids (VFA) are considered to be the key players in anaerobic digestion (Lim et al, 2000). In this context VFA concentration was measured regularly as shown in Fig.…”

Comparison between acclimated and unacclimated biomass affecting anaerobic–aerobic transformations in the biological removal of phosphorus

“…The beneficial effect of addition of readily biodegradable carbon sources, such as glucose or fermentation products from primary sludge anaerobic digesters, such as short-chain fatty acids or their salts (in this paper they were abbreviated to SCFA) has been recognised in the literature [5][6][7]. However, until now most of the studies on carbon substrate affecting EBPR are focused on acetate or glucose [1,3,[8][9][10][11][12].…”