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- Title
Sledování vlivu technologických podmínek na účinnost rozkladu odpadní ovčí vlny.
- Authors
Krejčé, Ondřej; Mokrejš, Pavel
- Abstract
Textile and meat industry produce high amount of waste sheep wool, which contains approx 90 % of keratin. This waste can be processed into keratin hydrolysate, which can be used in agriculture, cosmetic industry and other branches. This article deals with processing of waste sheep wool by two-stage alkali-enzymatic hydrolysis; the influence of selected technological conditions on hydrolyses effectiveness (expressed by amount of decomposed wool) was studied. Two-leveled statistical factorial-test method with three monitored technological conditions was used: concentration of alkali (KOH) during hydrolysis, amount of enzyme in hydrolysis 2nd stage and temperature in hydrolysis 2nd stage. According to Fischer test concentration of KOH was found to be the most important factor in the study of hydrolysis. In the 1st step, wool was hydrolysed for 48 hours in 0.6% water solution of KOH (ratio 1:15) at 90 °C. The highest effectiveness of hydrolysis (73 %) was achieved at following conditions of 2nd stage hydrolysis: 5% amount of enzyme (based on weighted quantity of wool), temperature 60 °C. Keratin hydrolysate prepared contains high amount of nitrogen (12.5 %) and acceptable amount of ash (15 %). Keratin hydrolysate has film-forming properties hence its utilisation in packaging will be the aim of subsequent study.
- Subjects
WOOL waste; HYDROLYSIS; BIODEGRADATION; WASTE management; INDUSTRIAL wastes; WASTE salvage; SOLID waste; WASTE products; PROTEOLYTIC enzymes
- Publication
Waste Forum, 2010, Vol 2010, Issue 1, p35
- ISSN
1212-7779
- Publication type
Article