Effects of FNA pretreatment on municipal solid waste acidifaction for volatile fatty acid production

Abstract

The current waste management processes only treat the waste to meet environmental regulations and neglects the potential benefits that can be obtained. There is a potential of viewing waste as feedstock for the production of value-added chemicals, which in turn reduces the quantities of waste. Anaerobic fermentation was carried out on TWAS under concentrations between 0 and 2.8 mg N/L FNA at a contact temperature of 25°C and pH of 5.5 ± 0.2 for contact time of 24 hours under Standard Retention Times of 1 day and 2 days. The FNA doses were; 0.35, 0.7, 1.4 and 2.8 mg N/L. A raw sample of TWAS without any pre- treatment, i.e. no FNA addition nor pH adjustment and a control sample (FNA = 0 mg N/L and the pH was adjusted to 5.5 and kept at a constant temperature of 25°C for 24hrs without any FNA additions) was also included.