Towards Biogas Production from Ice-Cream Production Wastes Al-ARZ Company Case
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Date
2018-05-21
Authors
Abu Al Haj, Ahd
Abdalrazeq, Areej
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Abstract
Proper management of waste streams and residues from industry is very important to prevent environmental pollution. In particular, the anaerobic digestion (AD) process can be used as an important tool for a safe disposal and energy recovery from industry waste streams and residues. Anaerobic digestion is an attractive waste treatment practice in which both pollution control and energy recovery can be achieved. The main products of anaerobic digesters are biogas and innocuous digested sludge solids, it consists mainly from methane (CH4) and carbon dioxide (CO2).
The primary objective of this present research was to investigate whether it was possible to recover energy (biogas) from ice-cream production residues through a mesophilic and thermophilic anaerobic digestion process. Also, to investigate if the ice cream wastes are feasible to produce bioethanol by fermentation process.
The ice cream wastes were digested in a small bioreactor 4 L in mesophilic condition at about 30 oC and thermophilic conditions at 60 oC, in order to examine the effect of seeding on biogas production, three different types of seeding (poultry manure at a ratio of 1:10 (w/w), cow manure at a ratio of 1:5 (w/w) and sewage sludge at a ratio of 1:10 (w/w)) were added.
The current study found that excessive foaming was produced and this affect the fermentation process but this problem can be solved by heating the ice cream prior to fermentation process. In general, therefore, it seems that require a large amount of ice-cream waste to produce a small amount of biogas, but it can be applied and produce sufficient quantities of biogas if use some seeding materials containing sufficient amount of nutrients.
In term of bioethanol production by fermentation process, it was found that ice cream wastes could produce bioethanol. The amount of ethanol produced from ice cream waste samples was 15.11 g/L after three days of fermentation while it was 11.33 g/L after the same days of fermentation using glucose as a substrate.