possible integration of biogas+bioethanol processing - bioenergybaltic

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possible integration of biogas+bioethanol processing - bioenergybaltic

Anaerobic Digestion (AD)

Suspended organic matter

Hydrolysis

Proteins Carbohydrates Lipids

Polypeptides

Peptides Mono and disaccharides Volatile acids and glycerine

AD is commonly used for the treatment

of animal manure, organic waste from

agriculture and urban areas and food

industry.

Acidogenesis

Acetogenesis

Organic compounds: volatile

fatty acids, alcohols, lactic acid

Mineral compounds: CO 2

,

H 2

, NH 4+

/NH 3

, H 2

S

Acetic acid CO 2

, H 2

Microbiological conversion of organic

matter to methane in the absence of

oxygen. The process is also known as

the biogas process and has been

widely utilized in wastewater treatment

plants.

Methanogenesis

Methane production:

CH 3

COOH => CH 4

+ CO 2

(Acetotrophic methanogenesis)

CO 2

+ H 2

=> CH 4

+ H 2

O (Hydrotrophic methanogenesis)

adapted from: Benabdallah El-Hadj T. (2006) ISBN: 84-690-2982-7

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