Naslov
Nitrate removal with bacterial cells attached to quartz sand and zeolite from salty wastewaters

Autori
Foglar, Lucija ; Sipos, Laszlo ; Bolf, Nenad

Izvornik
World journal of microbiology & biotechnology (0959-3993) 23 (2007), 11; 1595-1603

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

Ključne riječi
denitrification ; spent brine ; mixed bacterial culture ; anoxic conditions ; quartz sand ; zeolite

Sažetak
A mixed bacterial culture was acclimated to the removal of high nitrate-N concentrations (100- 750 mg NO3¯ ; ; ; -N l-1) from salty wastewaters. The experiments were carried out under anoxic conditions in the presence of 0.5, 1.5 and 3% (w/v) NaCl at different temperatures. The acclimated mixed bacterial culture was attached to quartz sand and zeolite. Denitrification was monitored in a continuous-flow bioreactor at different hydraulic retention times (HRT). Nitrate removal with cells attached to quartz sand and zeolite was completed at HRT of 167 h and 25 h respectively. Then brine denitrification with bacterial cells attached to zeolite was monitored for 85 days. Under the increased nitrate loading rate, nitrate removal was above 90%. Furthermore, during denitrification, not more than 0.5 mg NO2¯ ; ; ; -N l-1 could be produced. It can be concluded that nitrate removal with the cells attached to zeolite is economically and operationally a promising solution to denitrification of brine wastewaters.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo, Drvna tehnologija

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