J. Surmaczgorska et al., NITROGEN REMOVAL FROM WASTE-WATER WITH HIGH AMMONIA NITROGEN CONCENTRATION VIA SHORTER NITRIFICATION AND DENITRIFICATION, Water science and technology, 36(10), 1997, pp. 73-78
Citations number
8
Categorie Soggetti
Water Resources","Environmental Sciences","Engineering, Civil
Shorter nitrification is reached through Nitrobacter bacteria activity
inhibition. Nitrobacter bacteria responsible for nitrite nitrogen oxi
dation are sensitive to free ammonium. The presence of free ammonium d
epended on a high ammonia nitrogen concentration in wastewater and its
pH, It was the pH of the wastewater that was the decisive parameter i
n Nitrobacter bacteria activity inhibition in stable temperatures and
at stable ammonia nitrogen concentrations. Reaction control in the aer
ation phase of the treatment process guaranteed the concentration of f
ree ammonium within the 1 to 6 mg NH3/l range and at the same time con
centration of free nitrous acid did not exceed 0.04 mg HNO2/l. It allo
wed nitrification to be significantly shortened and to receive build-u
p of nitrite nitrogen up to 300 mg NO2-N/l. Nitrification rate was abo
ut 0.06 g N/g MLSS . d. Measured oxidation rates of particular groups
of nitrifying bacteria as oxygen uptake rates by Nitrosomonas and Nitr
obacter bacteria respectively made control of shorter nitrification ea
sier and gave insight into the activity of both nitrifier groups. (C)
1997 IAWQ. Published by Elsevier Science Ltd.