aqualytic ® aqualytic ® product training: water analysis
TRANSCRIPT
AQUALYTIC®
AQUALYTIC® Product Training:
Water Analysis
2
3
Methods and Products
titrimetric methods
colorimetric methods
tablet count method
drop countmethod
speedtest
MINIKIT
Test Kit
MINIKIT
visualmethods
photometricmethods
ComparatorCHECKIT®
Test Kit
AL100AL200AL400AL450AL800
4
Principle of Photometric Measurement
5
Electromagnetic spectrum
h
6
Absorption of light
Green
Red
STOP
Red- / Blue light
700 nm
550 nm450 nm
White light
700 nm
550 nm450 nm
Red
Blue Blue
h h
7
Absorption of light
E = lgI 0
I
I0: Intensitiy of the entering light
I: Intensitiy of the transmitted light
0 10 20 30 40 50 60 70 80 90 100
∞ 1.00 0.50 0.30 0.15 0.05 0.00
Transmission [%]
Extinction [Abs]
T[%]
E[Abs]
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Principle of Photometric Measurement
9
Detector Detector
LEDLED
LED
Interfe-rence filter
Measuring beam
Interfe-rence filter
Principle of AL400
10
Principle of AL450
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Principle of AL800
Microprocessor unitTungsten halogen lamp
Monochromator
Movable mirror
Sample chamber
Silicon photodiodeFor checking the optical system the AL800 has an integrated Didymium-filter, which is placed automatically in front of the
detector during self test.
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Principle of Turbidity Measurement
13
COD-BOD
BODCOD
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COD-BOD Relationship
≈ 20 % non degradable organic material
≈ 80 % degradable organic material
COD/ BOD5
RelationCharacteristics
< 1,7 Easy degradable / nearly complete decomposition
1,7 – 10 Incomplete decomposition / reasons: Some of the material is not degradable Inhibition because of toxic ingredients Slow adaptation of microorganisms
> 10 No decomposition / reasons: Persistent ingredients Complete inhibition because of toxic substances
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BOD - Biochemical Oxygen Demand
Corg + O2
BacteriaCO2 + Cell mass
Measurement corresponds to the process during waste water treatment:
∆ p = BOD
Carbondioxide
Organic OxygenMaterials
Pressure Sensor
Gasket & CO2Absorber
Glass Bottle
Gas Phase
Waste Water
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Schematic diagram of a wastewater treatment plant
(activated sludge plant)
Oxygen supply
Waste feed
Aeration tank
Waste sludge
Effluent
Sludge Return
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Important Wastewater Parameter
Wa stwa te r
tre a tm e nt
p la nt
C O D 700 m g /l
B O D 400 m g/l
P hosphorus 10 m g/l (total)
Nitrogen 50 mg/l (total)
Phosphorus 2 m g/l (to ta l)
CO D 100 m g/l
N itrogen 10 m g/l (to ta l)
BO D 20 m g/l
Tota l n itrogen m eans: - o rgan ic N itrogen - A m m onium - N itra te - N itrite
EffluentW aste feed
Wastewatertreatmentplant
Nitrogen means:- Ammonia- Nitrate- Nitrite
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BOD5
BOD-graph at 20 °C
0
20
40
60
80
100
120
0 5 10 15 20 25t [d]
BOD mg/l
C-org %
BODn+1 > BODn (20,6 % p.d.) BOD5 70% degradation of total BOD
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BOD-Graph
A: Idealised BOD-Graph
B: Nitrification occures (use nitrification inhibitor N-ATH)
C: Measurement is overrange (change measuring range or dillute sample)
D: Measurment system is leaky or anaerobiosis occurs
E: Microorganisms were not pre-adapted; choose a suitable inokulum
20
pH-Sensor
Buffer solution pH 7
Metal lead for pH voltage
Metal lead for pH voltage (Reference Ag/AgCl element)
Reference Elektrolyte
Reference diaphragm
pH glas diaphragm
21
pH-Value
SL_2
U_AS
SL_1
pH
mV
pH
mV
pH-value
Pot
entia
lin m
V
22
Conductivity- Sensor
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Oxygen-Sensor
Refillopening
Sensorshaft
O-Ring seal
Membrame cap