Naslov
The use of bacteria attached to Lewatit M600 for denitrification of the Cetina surface water

Autori
Foglar, Lucija ; Babić, Ana-Marija ; Šiljeg, Mario

Izvornik
WSEAS transactions on environment and development (1790-5079) 6 (2010), 2; 113-122

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
bacteria ; immobilization ; ion exchanger ; nitrate ; nitrite ; denitrification

Sažetak
The selected mixed bacterial culture was attached to the nitrate selective ion exchange resin - Lewatit M600 (NSI) and used for investigation of nitrate removal from the surface Cetina water (SCW). The investigated system enables bonding of nitrate ions and simultaneously, the degradation of bonded nitrate. The nitrate adsorption on NSI was studied and described with the Freundlich isotherm. With the use of bacterial cells attached on NSI, the nitrate (50 - 200 mg NO3- N/L) was completely removed from the SCW, at a methanol to nitrate-N mass (C/N) ratio of 4.5:1, during 4-7 hours at pH = 7.2 and 25 °C under static anoxic conditions. The influence of initially present methanol on the denitrification process was investigated and the required C/N ratio of 2.5:1 was determined, although the denitrification process was faster in the presence of increased C/N ratios. The applicability of the bacteria attached to the NSI for fast and efficient nitrate removal from the surface Cetina water at different temperatures was further investigated. The denitrification rates were calculated according to the zero -order reaction model. The activation energy, EA and Arrenius factor, Ar for denitrification were 11.40 kJ/mol and 1790.05 mg NO3-N/Lh, respectively.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo, Interdisciplinarne tehničke znanosti

POVEZANOST RADA