Naslov
Expanded bed groundwater treatment

Autori
Dempsey, Michael J. ; Cowl, James ; Štembal, Tamara ; Sipos, Laszlo

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, neobjavljeni rad, znanstveni

Skup
Society for Applied Microbiology Millennium Meeting

Mjesto i datum
Coventry, Ujedinjeno Kraljevstvo, 10.04.2000. - 14.04.2000

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
groundwater; biofilters; water treatment; fluidized bed

Sažetak
Groundwater normally has to be treated before it is suitable for potable use. For example by aeration, to supply oxygen ; passage down through a sand filter, to filter out fine particulates and remove dissolved materials by microbial action ; followed by a disinfection step, often using hypochlorite. However, many groundwaters contain trace quantities of ammonia, which reduces the anti-microbial efficiency of chlorination. We have investigated the potential of ammonia removal via oxidation to nitrate in a fluidized bed bioreactor. A laboratory-scale expanded bed column (2·5 cm diameter by 50 cm height), containing coke colonised by a mixed population of nitrifying bacteria, to form biofilms approximately 0.5 mm thick (40-50 gdm-3 dry weight) was fed an artificial groundwater containing 1.9 mg/l NH3-N. The bacteria were able to oxidise virtually all the ammonia to nitrate in a single pass, with a residence time of about 100 s through the bed (upward velocity approximately 0.5 cm s-1 ). This equates to a throughput of 60 m3 groundwater per m3 expanded bed per hour.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Kemijsko inženjerstvo

POVEZANOST RADA