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Hydrogen production from coffee pulp by dark fermentation.

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Area of Science:

  • Biotechnology
  • Environmental Science
  • Renewable Energy

Background:

  • Coffee pulp is an abundant agricultural waste with high moisture and sugar content.
  • Effective waste management strategies are needed to control coffee production byproducts.
  • Valorization of coffee pulp can lead to sustainable energy solutions.

Purpose of the Study:

  • To characterize coffee pulp and evaluate its potential for hydrogen production.
  • To analyze the kinetics of hydrogen production from coffee pulp using dark fermentation.
  • To assess the feasibility of using coffee pulp as a substrate in a biogas process.

Main Methods:

  • Diagnostic study to characterize coffee pulp properties (pH, total volatile solids, total sugar, biodegradability index).
  • Hydrogen production experiments conducted in a bioreactor.
  • Kinetic analysis using Modified Gompertz model.

Main Results:

  • Biodegradability index of 0.91, initial pH 4.16, total volatile solids 58.1 g/L, total sugar 19.6 g Dextrose/L.
  • Hydrogen yield of 49.2 NmL H2/g DQOinitial and 4.18 L H2/kg C.P.
  • Modified Gompertz parameters: Hmax 585 NmL, Rmax 4.1 NmL H2/g DQO-h, lag phase 92.70 h.
  • Chemical Oxygen Demand (COD) reduction of 13.58%.

Conclusions:

  • Coffee pulp is a viable substrate for dark fermentation, yielding hydrogen comparable to other complex substrates.
  • Dark fermentation of coffee pulp can serve as a pre-treatment step in biogas production, generating both hydrogen and biogas.
  • This process offers a dual benefit of waste valorization and renewable energy generation.