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The efficiency of a membrane bioreactor in drinking water denitrification
Aleksandra Petrovič, Marjana Simonič, 2015, izvirni znanstveni članek

Opis: The membrane bioreactor (MBR) system was investigated regarding its nitrate removal capacity from drinking water. The performance of a pilot-scale MBR was tested, depending on the operational parameters, using sucrose as a carbon source. Drinking water from the source was introduced into the reactor in order to study the influence of flow-rate on the nitrate removal and denitrification efficiency of drinking water. The content of the nitrate was around 70 mg/L and the C/N ratio was 3:1. Nitrate removal efficiencies above 90% were obtained by flow-rates lower than 4.8 L/h. The specific denitrification rates varied between 0.02 and 0.16 g/L NO3/ (g/L MLSS.d). The efficiencies and nitrate removal were noticeably affected by the flow-rate and hydraulic retention times. At the maximum flow-rate of 10.2 L/h still 68% of the nitrate had been removed, whilst the highest specific denitrification rate was achieved at 0.2738 g/L NO3/ (g/L) MLSS.d). The maximum reactor removal capacity was calculated at 8.75 g NO3/m3.h.
Ključne besede: capacity, denitrification, drinking water, efficiency, membrane bioreactor, sucrose
Objavljeno: 19.07.2017; Ogledov: 630; Prenosov: 294
.pdf Celotno besedilo (123,62 KB)
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Denitrification of spent regenerated brine using molasses
Brigita Tepuš, Marjana Simonič, Aleksandra Petrovič, Jasmina Filipič, 2014, izvirni znanstveni članek

Opis: Spent BRINE from the regeneration of exhausted resins has to be properly treated before its disposal. The heterotrophic denitrification of regenerated brine was studied in present work. Molasses which served as a carbon source has until now not been applied during brine denitrification. The nitrate and nitrite consumptions were observed according to different ratios between total organic carbon and nitrate (TOC / NO3 ratios) and the influence of NaCl was studied during batch experiments. This work ascertained that molasses is a very good source of carbon, and no addition of other nutrients is necessary. The complete nitrate removal from regenerated brine could be achieved using molasses.
Ključne besede: nitrate, denitrification, regeneration brine, molasses, kinetics
Objavljeno: 05.07.2017; Ogledov: 565; Prenosov: 313
.pdf Celotno besedilo (1,15 MB)
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A kinetic study on drinking water denitrification using a membrane bioreactor
Aleksandra Petrovič, Andreja Goršek, Marjana Simonič, 2015, izvirni znanstveni članek

Opis: This study determines the basic parameters of Monod kinetics for microbial growth within a membrane bioreactor using the Zenon ZeeWeed 10 MBR system. The influent nitrate concentration was kept at 70 ± 2 mg L-1 NO3ˉ. During the experiments a constant concentration of activated sludge was maintained at approximately 0.76 g L-1 under anoxic conditions. Sucrose was added to the activated sludge as a carbon source. The Monod kinetic parameters were calculated by numerical interpolation, by considering experimental data. The maximum specific growth rate of the biomass was determined to be 0.31 h-1, half-saturation constant 5.4 mg L-1, and yield coefficient 0.35 mg biomass mg-1 COD. Afterwards, a dynamic simulation was performed within the calculated parameters. The dynamic concentration profiles for substrate and biomass were determined at different dilution rates within the range of 0.8 to 5 d-1.
Ključne besede: kinetics, denitrification, drinking water, membrane bioreactor, sucrose
Objavljeno: 03.04.2017; Ogledov: 858; Prenosov: 303
.pdf Celotno besedilo (1,68 MB)
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