Transcript Tintometer GmbH

®
AQUALYTIC
AQUALYTIC® Product Training:
Water Analysis
2
Methods and Products
titrimetric
methods
tablet count
method
MINIKIT
drop count
method
Test Kit
speed
test
MINIKIT
visual
methods
Comparator
CHECKIT®
Test Kit
photometric
methods
AL100
AL200
AL400
AL450
AL800
colorimetric
methods
3
Principle of Photometric
Measurement
4
Electromagnetic spectrum
5
Absorption of light
White light
Red- / Blue light
700 nm
700 nm
550 nm
450 nm
550 nm
450 nm
6
Absorption of light
Transmission [%] T[%]
Extinction [Abs]
0 10 20 30 40 50 60 70 80 90 100
E[Abs] ∞ 1.00 0.50 0.30 0.15 0.05 0.00
I0
E = lg
I
I0: Intensitiy of the
entering light
I: Intensitiy of the
transmitted light
7
Principle of Photometric
Measurement
8
Principle of AL400
Detector
Detector
Interference filter
Interference filter
Measuring
beam
LED
LED
LED
9
Principle of AL450
10
Principle of AL800
Tungsten halogen lamp Microprocessor unit
Movable
mirror
Silicon photodiode
Monochromator
Sample
chamber
For checking the optical
system the AL800 has an
integrated Didymium-filter,
which is placed
automatically in front of the
detector during self test.
11
Principle of Turbidity
Measurement
12
COD-BOD
COD
BOD
 
 
 
 
13
COD-BOD Relationship
COD/ BOD5
Relation
< 1,7
Characteristics
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
 ≈ 20 % non degradable organic
material
 ≈ 80 % degradable organic material
14
BOD - Biochemical
Oxygen Demand
∆p
Pressure Sensor
Gasket &
CO2Absorber
Glass Bottle
= BOD
Measurement corresponds to the
process during waste water treatment:
Corg + O2
Bacteria
Organic Oxygen
Materials
CO2 + Cell mass
Carbon
dioxide
Gas Phase
Waste Water
15
Schematic diagram of a wastewater
treatment plant
Oxygen supply
Waste feed
(activated sludge plant)
Effluent
Aeration tank
Sludge Return
Waste sludge
16
Important Wastewater
Parameter
Waste feed
Effluent
COD 700 mg/l
COD 100 mg/l
BOD 400 mg/l
BOD 20 mg/l
Wastwater
Nitrogen 50 mg/l
(total)
Phosphorus 10 mg/l
(total)
Nitrogen
means:
Total nitrogen means:
- Ammonia
- organic
Nitrogen
Nitrate
- Ammonium
- Nitrite
- Nitrate
Waste
water
treatment
treatment
plant
plant
Nitrogen 10 mg/l (total)
Phosphorus 2 mg/l
(total)
17
BOD-gr aph at 20 ° C
120
BOD5
100
80
BOD mg/l
60
C-org %
40
20
0
0
5
10
15
20 t [d]
 BODn+1 > BODn (20,6 % p.d.)
 BOD5  70% degradation of total BOD
18
25
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
19
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
20
pH-Value
SL_1
Potentialin mV
mV
pH
SL_2
mV
pH
pH-value
U_AS
21
Conductivity- Sensor
22
Oxygen-Sensor
23