Efficiency of aerobic biodegradation of beet molasses vinasse under non-controlled pH : conditions for betaine removal

• Autorzy: Ryznar-Luty A. , Cibis E. , Krzywonos M. , Miśkiewicz T.

Identyfikatory

DOI

10.1515/aep-2015-0001

Warianty tytułu

PL

Efektywność tlenowej biodegradacji buraczanego wywaru melasowego przy nieregulowanym pH podłoża : określenie warunków usunięcia betainy

• Języki publikacji: EN

Abstrakty

EN

The aim of the study was to establish such conditions that would provide high-efficiency aerobic biodegradation of beet molasses vinasse with a mixed culture of thermo- and mesophilic bacteria of the genus Bacillus in batch processes without controlling the pH of the medium. Particular consideration was given to the betaine removal (the main pollutant of vinasse), which accounted for as much as 37.6% of total organic carbon. Biodegradation was performed in a stirred tank reactor at 27–63°C with initial pH (pH₀) of 6.5 and 8.0. Efficiency of biodegradation was expressed in terms of reduction in SCOD_sum, which is a sum of SCOD (soluble chemical oxygen demand, i.e. COD determined after suspended solids separation) and theoretical COD of betaine. The values achieved at 27 and 36°C with pH0 = 8.0 exceeded 77.7%, whereas those obtained at 36 and 45°C with pH0 = 6.5 were higher than 83.6%. The high biodegradation effi ciency obtained in the four processes is attributable to the betaine removal by the bacterial strains used in the study. Maximal extent of reduction in SCOD_sum (85.41%), BOD₅ (97.91%) and TOC (86.32%), and also the fastest rate of biodegradation (1.17 g O2/l∙h) was achieved at 36°C and pH₀ = 8.0.

PL

Celem pracy było określenie warunków zapewniających wysoką efektywność tlenowej biodegradacji buraczanego wywaru melasowego za pomocą mieszanej kultury termo- i mezofi lnych bakterii z rodzaju Bacillus w procesach okresowych prowadzonych bez regulacji pH podłoża. Główną uwagę poświęcono usunięciu betainy (głównego zanieczyszczenia buraczanego wywaru melasowego). Stanowiła ona aż 37,6% zawartości ogólnego węgla organicznego w biodegradowanym wywarze. Procesy biodegradacji prowadzono w 5-litrowym bioreaktorze z układem mieszania w temperaturze 27–63°C, co 9°C, dla pH początkowego (pH₀) równego 6,5 i 8,0. Wysoką efektywność biodegradacji wyrażoną poprzez redukcję SChZTcałk (suma SChZT (ChZT oznaczane po oddzieleniu części stałych) i teoretycznego ChZT betainy) uzyskano w procesach prowadzonych w temperaturze 27 i 36°C dla pH0 = 8,0 (redukcja ponad 77,7%) oraz 36 i 45°C dla pH0 = 6,5 (redukcja ponad 83,6%). Przyczyną wysokiej efektywności biodegradacji w wymienionych czterech procesach było usunięcie przez bakterie betainy. Maksymalny stopień redukcji SChZTcałk (85,41%), BZT₅ (97,91%) i OWO (86,32%), jak również największą szybkość biodegradacji (1,17 g O2/l.h) uzyskano w eksperymencie prowadzonym w temperaturze 36°C dla pH₀ = 8,0.

Słowa kluczowe

EN

aerobic biodegradation; thermophilic; mesophilic; vinasse; betaine; Bacillus

PL

biodegradacja beztlenowa; bakteria termofilna; bakteria mezofilna; buraczany wywar melasowy; betaina; Bacillus

• Wydawca: Institute of Environmental Engineering, Polish Academy of Sciences
• Czasopismo: Archives of Environmental Protection
• Rocznik: 2015
• Tom: Vol. 41, no. 1
• Strony: 3--14
• Opis fizyczny: Bibliogr. 46 poz., tab., wykr.

Twórcy

autor

Ryznar-Luty A.

• Wroclaw University of Economics, Poland Department of Bioprocess Engineering

autor

Cibis E.

• Wroclaw University of Economics, Poland Department of Bioprocess Engineering

autor

Krzywonos M.

• Wroclaw University of Economics, Poland Department of Bioprocess Engineering

autor

Miśkiewicz T.

• Wroclaw University of Economics, Poland Department of Bioprocess Engineering

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