Stabilization of anaerobic digestion of kitchen wastes using protein-rich additives: Study of process performance, kinetic modelling and energy balance. (October 2021)

• Record Type: Journal Article
• Authors: Isha, Adya; D' Silva, Tinku Casper; Subbarao, Paruchuri M.V.; Chandra, Ram; Vijay, Virendra Kumar
• Is Part Of: Bioresource technology. Volume 337(2021)
• Publication Date: 2021-10
• Subjects: Kitchen waste -- Single-stage anaerobic digestion -- Protein-rich additives -- Kinetic modelling -- Principal component analysis; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2021.125331
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Long-term performance of KW-AD of different acidic streams was evaluated. Addition of protein-rich pongamia de-oiled cake stabilized all the digesters. Kinetic models were evaluated with the experimental values to assess the biodegradability. The addition of pongamia de-oiled caked had a synergistic effect on the biogas yield. Energy efficiencies exceeded 96% in all digesters. Abstract: Anaerobic digestion (AD) of acidic kitchen waste (KW) streams is found to be unstable and leads to poor overall efficiency. This study assessed the effect of pongamia de-oiled cake addition on KW-AD. High acidic KW (pH: 2.00–5.00), medium acidic KW (pH: 5.00–7.00) and low alkaline KW (pH: 7.00–8.00) fed into digesters I, II and III at 10% total solids (TS) achieved biogas yields of 177.82 ± 19.30, 216.57 ± 7.42 and 280.45 ± 2.55 L/kg VS. d, respectively. Maximum synergistic effect of pongamia de-oiled cake was observed in digester I with increased methane production of 46.04% and volatile solids reduction of 11.18%. The principal component analysis and kinetic evaluation revealed that pongamia de-oiled cake addition had a positive effect on the AD parameters in all digesters. With energy efficiencies exceeded 96% in all the digesters, the study proposes the addition of protein-rich additives for KW-AD stabilization.