Aspen Plus simulation strategies applied to the study of chitin bioextraction from shrimp waste / David Gómez-Ríos, Grace Navarro, Paola Monsalve, Rolando Barrera-Zapata, Rigoberto Ríos-Estepa.
Sažetak

Chitin is an aminopolysaccharide of industrial interest commonly obtained from shrimp processing waste through chemical or biotechnological means. Current environmental concerns offer a stimulating perspective for chitin bioextraction with lactic acid bacteria since a considerable reduction in the use of corrosive and pollutant products is possible. Nevertheless, the efficiency of this bioprocess is still a matter of discussion. In this work, the experimental studies of chitin bioextraction from Pacific white shrimp (Litopenaeus vannamei) waste with a mixed culture of Lactobacillus plantarum, Lactobacillus bulgaricus and Streptococcus thermophilus are used in process simulation using Aspen Plus software for the analysis of the potential application of a bioprocess on plant scale. The experimental results of characterization in shake flasks and 1-litre bioreactor indicated that 50 h of fermentation with the mixed culture of lactic acid bacteria was enough to extract more than 90 % of minerals and proteins from the shrimp waste. The use of experimental parameters in the simulation allowed a reliable representation of the bioprocess yielding normalized root mean square values below 10 %. Simulation was used for the assessment of the impact of the raw material variability on the production costs and gross margin. In this regard, the gross margin of the operation ranged from 42 to 52 % depending on the raw material composition and product yield.; Hitin je aminopolisaharid od industrijskog značaja, koji se obično dobiva obradom otpada iz proizvodnje kozica kemijskim i biotehnološkim putem. U novije se vrijeme zbog brige za okoliš sve više provodi bioekstrakcija hitina pomoću bakterija mliječno-kiselog vrenja, radi smanjenja uporabe korozivnih i onečišćujućih sredstava. Usprkos tome, i dalje se vodi rasprava o učinkovitosti tog bioprocesa. U ovom je radu ispitana bioekstrakcija hitina iz otpada iz proizvodnje atlantske bijele kozice (Litopenaeus vann¬amei) s pomoću miješane kulture bakterija Lactobacillus plantarum, Lactobacillus bulgaricus i Streptococcus thermophilus Simulacijom pomoću kompjuterskog programa Aspen Plus ispitana je mogućnnost industrijske primjene bioprocesa. Rezultati pokusa na tresilici i u jednolitrenom bioreaktoru pokazali su da za ekstrakciju više od 90 % mineralnih tvari i proteina iz otpada iz proizvodnje kozica treba 50 sati fermentacije s pomoću miješane kulture mliječno-kiselih bakterija. Primjena je eksperimentalnih parametara u simulaciji omogućila pouzdan prikaz bioprocesa s normaliziranim korijenom srednje kvadratne pogreške manjim od 10 %. Simulacija je upotrijebljena za procjenu utjecaja sastava sirovine na troškove proizvodnje i bruto maržu. Ovisno o sastavu sirovine i prinosu bruto marža je iznosila između 42 i 52 %.