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Production of Organic Acids01:25

Production of Organic Acids

Lactic acid, an important organic acid extensively applied in food, pharmaceutical, and biodegradable polymer industries, is primarily produced via microbial fermentation. This method is favored over chemical synthesis due to its environmental sustainability and capacity for enantiomerically pure product formation. Among various microbial processes, the fermentation of starch-based substrates stands out due to the abundance and renewability of raw materials like corn and potatoes.Hydrolysis of...
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Related Experiment Video

Updated: Jun 24, 2026

Biogas Purification through the use of a Microalgae-Bacterial System in Semi-Industrial High Rate Algal Ponds
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Biogas generation apple pulp.

H Llaneza Coalla1, J M Blanco Fernández, M A Morís Morán

  • 1Polytechnic High School of Engineering, University of Oviedo, Gijón, Spain. hllaneza@uniovi.es

Bioresource Technology
|April 8, 2009
PubMed
Summary

Cider production waste, or apple pulp, can be anaerobically digested with slaughterhouse waste to produce biogas. This co-digestion process is stable and efficient, yielding high methane concentrations.

Area of Science:

  • Biotechnology
  • Waste Management
  • Renewable Energy

Background:

  • Regional waste management challenges in Asturias, Spain, due to cider production residues.
  • Slaughterhouse waste as a potential co-substrate for anaerobic digestion.

Purpose of the Study:

  • To investigate the anaerobic digestion of apple pulp as a co-substrate with slaughterhouse waste.
  • To evaluate biogas production and process stability during co-digestion.

Main Methods:

  • Laboratory-scale anaerobic digestion using a 10 L continuously stirred tank reactor (CSTR).
  • Co-digestion of apple pulp with pig intestine and bovine stomach content under mesophilic conditions.
  • Monitoring of biogas production, pH, volatile fatty acids, fat concentration, methane and H2S content, and chemical oxygen demand (COD) removal.

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Published on: July 13, 2012

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Main Results:

  • Satisfactory biogas production (0.8 m³ kg⁻¹ OTS) was achieved.
  • Stable process conditions were maintained: pH near 8.0, volatile fatty acids < 3000 mg/l, and fat concentration < 500 mg/l.
  • High COD removal efficiency (near 80%) and methane concentration (77-80%) were observed.
  • Methane and H₂S concentrations were comparable to those without apple pulp.

Conclusions:

  • Apple pulp is a viable co-substrate for anaerobic digestion with slaughterhouse waste, enhancing biogas production.
  • The co-digestion process remains stable and efficient within certain limits.
  • Inhibitory effects on methanogenic bacteria were noted at approximately 10% apple pulp concentration in the input material.