Treatment of coffee waste by slurry-state anaerobic digestion

Anaerobic co-digestion of coffee waste and sewage sludge

“…The anaerobic digestion of coffee waste has been reported at mesophilic temperatures (Lane, 1983;Raetz, 1990) and also at thermophilic temperatures (Kida et al, 1992;Kostenberg and Marchain, 1993). Boopathy (1987) studied different inoculum sources and found that the biomass from a sewage digester appeared to acclimatise quickly to the coffee pulp.…”

Development of power­efficient and environmentally safe coffee product technologies

“…Various possibilities for using coffee slurry are discussed, namely, production of biofuel [6], biodiesel [7], biogas [8], bioethanol, fuel pellets [9,10] and bio-oil [11]. It is proposed to produce value-added products from coffee slurry, such as bioactive compounds, adsorbents, polymers, nanocomposites [12] and compost [13].…”

“…However, issues related to system analysis of heat technologies for the production of instant coffee and food concentrates remained unresolved in [6][7][8][9][10][11][12][13]. It may be caused by the fact that researchers pay more attention to the problems of waste disposal though the technology of instant coffee production has immense reserves of improvement of energy efficiency and reduction of burden on the environment.…”

Valorisation of the Residues of Coffee Agro-industry: Perspectives and Limitations

“…Although several attempts were carried out as early as in the 90's, the technology of bio-gasification is far from being adopted on a large scale. Feasibility studies indicate that slurries containing 20% (w/v) coffee waste solids can be treated anaerobically in one and two-phase thermophilic methane fermentation systems at 53°C without discharging anything but the coffee waste residues [40]. Biogas could be produced by the co-digestion of coffee-pulp and cow-dung mixture under solar radiation [41].…”