Fish Waste Management: Treatment Methods Based on the Use of Microorganisms - Aquaculture Microbiology and Biotechnology - page 230

Other Microorganisms
A mixture of fi sh waste and peat was composted and extracts from this
compost were sterilised and inoculated at a ratio of 5% (v/v) before use
as a substrate for the acid-resistant microorganism Scytalidium acidophilum
ATCC 26774 (150 rpm, 25.0°C, pH 2.0 ± 0.1, 8-10 d) ( Fig. 9.3 ) . The results
showed that the acid extracts of compost had higher concentrations of
nutrients (lipids, carbohydrates, and protein) than the compost. Compost
extracts can be effectively utilised as a substrate for the growth of the
microorganism S. acidophilum , for the biofi ltration of liquid and gas
effl uents, and in the growth of mushrooms (Martin, 1999).

Peat
(bulking
agent)

Fish waste

Composting in a
passively aerated
composting system

Dilute
H 2 SO 4

Compost

Autoclave
(121±1 o C,2h)

Pressing/Filtration

Compost extracts

Sterilization

Substrate for
fungus
Scytalidium
acidophilum

Fig. 9.3 A fundamental process for conversion of fi sheries processing waste to valuable
compost (Source; Martin, 1999; Arvanitoyannis and Kassaveti, 2008).