Water Science & Technology: Water Supply Vol 1 No 2 pp 91–98 © IWA Publishing 2001
The influence of changes in groundwater composition on the efficiency of
manganese and ammonia nitrogen removal on mature quartz sand filtering beds
R Bray* and K Olańczuk-Neyman**
*
Hydro- and Environmental Engineering Faculty Technical
University of Gdańsk, G.Narutowicza 11/12 80-952 Gdańsk,
Poland. e-mail: rbra@pg.gda.pl
**
Hydro- and Environmental Engineering Faculty Technical
University of Gdańsk, G.Narutowicza 11/12 80-952 Gdańsk,
Poland. e-mail: kola@pg.gda.pl
ABSTRACT
The results of investigations of natural groundwater treatment containing
increased manganese and ammonia nitrogen concentrations are presented.
The main aim of the work was to show the influence of changes in water
composition on manganese and ammonia nitrogen removal from groundwater
on second-stage mature quartz sand filters. According to the results
obtained, the efficiency of manganese elimination from water did not
depend on periodic changes in ammonia nitrogen or dissolved oxygen
concentrations. However, if low oxygen concentrations (lower than
2 mg/dm3) were maintained for a longer time, the manganese
concentration in the filtrate gradually increased. The ammonia nitrogen
concentration in the filtered water appeared to be the most relevant
factor affecting the efficient removal of manganese and the dissolved
oxygen concentration was less important. The nitrification process
appeared to be vulnerable to changes in the concentrations of the
substrates: ammonia nitrogen (either an increase or decrease) and oxygen (an decrease). It was observed that it is necessary for nitrifying
bacteria to adapt (lag phase) to rapidly changing water composition. Due
to the sorption process, the inhibition of nitrification on the filtering
beds did not significantly influence the efficiency of ammonia nitrogen
removal.
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