aqualytic ® aqualytic ® product training: water analysis

AQUALYTIC®

AQUALYTIC® Product Training:

Water Analysis

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3

Methods and Products

titrimetric methods

colorimetric methods

tablet count method

drop countmethod

speedtest

MINIKIT

Test Kit

MINIKIT

visualmethods

photometricmethods

ComparatorCHECKIT®

Test Kit

AL100AL200AL400AL450AL800

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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

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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

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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

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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

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pH-Value

SL_2

U_AS

SL_1

pH

mV

pH

mV

pH-value

Pot

entia

lin m

V

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Conductivity- Sensor

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Oxygen-Sensor

Refillopening

Sensorshaft

O-Ring seal

Membrame cap