09/07/2009khelifi faiza 1 influence of trace elements in nitrification
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09/07/2009 Khelifi Faiza 1
Influence of trace elements in nitrification
09/07/2009 Khelifi Faiza 2
• Introduction
• Nitrification: What is it and why is it important?
• Problems met by OASEN Company
• Batch experiment
• Conclusions
09/07/2009 Khelifi Faiza 3
Different ways to remove ammonium:
• Break point chlorination (not used in the Netherlands)
• Adsorption of ammonium on zeolites, ions exchange
• Stripping
• Biological conversion: Nitrification
09/07/2009 Khelifi Faiza 4
Nitrification
• Biological oxydation of ammonium into nitrite and then nitrate.
• NH3 + 1,5 O2 + nitrosomonas NO2- +H2O + H+
NO2- + 0,5 O2 + nitrospira NO3-
09/07/2009 Khelifi Faiza 5
Why is it important?
• pH > 8 => NH3 formation
• Nitrite formation Poisonous for fish Blue Baby syndrom
• NH4: Substrate for many bacteria
09/07/2009 Khelifi Faiza 6
Ammonium in filter effluent
0
1
2
3
4
5
6
Oct, 1997 Oct, 1998 Oct, 1999 Oct, 2000Am
mo
niu
m i
n f
ilte
r e
fflu
en
t [
pp
m N
H
4 ]
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Batch experiment
*Aeration*T=12°C*Shaking
09/07/2009 Khelifi Faiza 8
The results expected:
• NH4+ decrease more quickly in bottles with trace
elements.
• NO3- and NO2
- increase more in bottles with trace element than in bottles without trace elements.
09/07/2009 Khelifi Faiza 9
NO3- and NO2
-
Bach experiment: (N-NO3 + N-NO2)in in 2nd filtrate Lekkerkerk
0
2
4
6
8
10
12
0 5 10 15 20 25
time (days)
(N-N
O3 +
N-N
O2)
(mg
)
without traceelements
with traceelements
Bach experiment: (N-NO3 + N-NO2) in first filtrate ZS Kamerik
0
0,5
1
1,5
2
2,5
3
3,5
4
0 5 10 15 20 25
time (days)
(N-N
O3 +
N-N
O2)
(mg
)
without traceelements
with traceelements
(N-NO3 + N-NO2) in 2nd filtrate of ZS Ridderkerk
0
1
2
3
4
5
6
7
8
0 5 10 15 20 25
time (days)
(N-N
O3 +
N-N
O2)
(mg
) without traceelementswith traceelements
Bach experiment: (N-NO3 + N-NO2) in Lekkerkerk drinking water
0
0,5
1
1,5
2
2,5
3
3,5
4
0 5 10 15 20 25
time (days)
(N-N
O3+
N-N
O2)
(mg
)
without traceelements
with traceelements
09/07/2009 Khelifi Faiza 10
Total nitrogentotal nitrogen in Lekkerkerk drinking water
0
2
4
6
8
10
12
14
16
0 5 10 15 20 25
time (days)
tota
l nit
roge
n (m
g)
without traceelements
with trace elements
total nitrogen in Lekkerkerk 2nd filtrate
02
46
810
1214
16
0 5 10 15 20 25
time (days)
tota
l nit
roge
n (m
g)
without traceelements
with trace elements
total nitrogen in first filtrate ZS Kamerik
02468
10121416
0 5 10 15 20 25
time (days)
tota
l nit
roge
n (m
g)
without traceelements
with trace elements
total nitrogen in 2nd filtrate Ridderkerk
02468
10121416
0 5 10 15 20 25
time (days)
tota
l nit
roge
n (m
g)
without traceelements
with trace elements
09/07/2009 Khelifi Faiza 11
Second experiment
*T =20°C*Shaking*Single limitation
09/07/2009 Khelifi Faiza 12
Results
Batch experiment: (NO3 + NO2)-N in Lekkerkerk 2nd filtrate
05
101520
0 2 4 6 8
time (days)
(NO3
+ N
O2)-N
(m
g)
without Co
with all traceelements
without traceelements
Batch experiment: NH4-N in Lekkerkerk 2nd filtrate
02468
1012
0 2 4 6 8
time (days)(N
H4-N
) (mg
)
without Co
with all traceelements
without traceelements
09/07/2009 Khelifi Faiza 13
Total nitrogenBatch experiment: Total nitrogen in Lekkerker 2nd filtrate
02468
101214161820
0 2 4 6 8
time (days)
To
tal
nit
rog
en
(m
g)
without Co
without P
without Mo
without Cu
without Zn
with all traceelementswithout traceelements
h
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Conclusion
09/07/2009 Khelifi Faiza 15
Thank you for your attention,
Questions ?