In this presentation, application of some parameters of water wwater analysis (i.e., Acidity, Sulfate, Volatile Acid,Nitrogen,greases and oils) , procedure to measure that parameter, environmental significance of that parameter and importance of that parameter in waste water analysis.
2. ACIDITY
The quantitative capacity of water to neutralize a base is
called “Acidity”.
The number of hydrogen atoms that are present
determines acidity.
Acidity of natural water is caused by carbon dioxide or by
strong mineral acids.
3. FIGURE
Types of acidity
of importance in
ordinary water
and waste water
analysis, and the
pH ranges in
which they are
significant
4. It is customary to consider that all water
having a pH lower than 8.5 contain
acidity.
Two types of acidity as follows
1. Total acidity (phenolphthalein acidity)
2. Mineral acidity (methyl orange acidity)
5. ENVIRONMENTAL SIGNIFICANCE
Little concern from sanitary or public health viewpoint.
No deleterious effect due to 𝐂𝐎 𝟐has been recognized.
Acid water are of concern because of their corrosive
characteristics.
𝐂𝐎 𝟐 must be calculated during after softening problems
(using lime or lime soda ash methods)
pH Range should be 6to 9.5 for biological process of
treatment.
Lower the pH in buffered lakes affecting aquatic life &
thus increases chemicals ( e.g. aluminium)
6. DETERMINATION OFACIDITY
Mineral acids are measured titration to a of about 3.7,
the methyl orange end point.
Titration of sample to the phenolphthalein end point
of 8.3 measures total acidity.
Two methods of measurement of acidy
1. Titration method
2. Field method
7. MINERAL ACIDITY
BURETTE : NaOH
FLASK : Sample
INDICATOR: Methayle orange
Bromophenol Blue
COLOR CHANGE :
TOTALACIDITY
BURETTE : NaOH
FLASK : Sample
INDICATOR: Phenolphthalein
Metacresol purple
COLOR CHANGE :
Burette
filling
Take
sample
Add
indicator
Titrate
Take
readings
8. APPLICATION OF ACIDITY DATA
In public water supplies field
To overcome corrosive characteristics resulting from
CO2
To choose the treatment method
Estimation of the chemical requirement for softening
process
To neutralize mineral acidity of wastes
To determine quantities of chemicals, size of
chemical feeders, storage space, and costs
9. SULFATE
It is of considerable concern because it is indirectly
responsible for two serious problem those are odor &
sewer-corrosion often associated with the handling
and treatment plant
It is of importance in public water supplies because of
its cathartic effect upon human when it is present in
excessive amounts.
12. METHODS OF ANALYSIS
OF SULFATE
Ion chromatography
Capillary ion electrophoresis
Gravimetric
Turbidimetric ( based on interference of precipitate)
Automated methylthaymol blue
13.
14. APPLICATION OF
SULAPHTE DATA
Consideration in determining their suitability for public and industrial
water supplies
Knowledge of sulphate content of the sludge or waste fed to
digestion units provides means of estimating 𝐇 𝟐S.
To determine whether scrubbing facilities will be needed to remove
𝐇 𝟐S and size of units requirement.
Knowledge of sulphate especially in anaerobic treatments is very
useful.
Sulphate has highly adverse impact on methanogenic process.
High sulphate concentration in ground water can hinder natural
anaerobic biodegradation of chlorinated solvents.
In anaerobic treatment sulfur as sulphate ion,
In anaerobic treatment sulfur as sulphide.
15. VOLATILE ACIDS
Law molecular weight fatty acids are termed as
volatile acids.
Distilled at atmospheric pressure
Stages in methane fermentation
16. ENVIRONMENTAL SIGNIFICANCE
Control of anaerobic waste treatment process.
Accumulation should be controlled or causes
disastrous effect
Inhibitions caused results in decreased the rate of
destruction of volatile.
Sludge must be removed or transferred
Important in detecting presence of unbalanced
conditions in anaerobic treatment units.
17. DETERMINATION OF
VOLATILE ACIDS
Two standard methods of measurement of volatile
acids
1. Chromatographic Separation
2. Distillation
Gas chromatography or ion chromatography are not
yet considered as standard.
18. CHROMATOGRAPHIC
SEPARATION
Rapid method and it remove 100% all volatile acids.
Two types of solvent are used
Extracted volatile acids measured by titration with
NaOH to phenolphthalein end point.
R-COOH + NaOH R-COO−
+ Na+
+ H2O
Separation and titration should be done within a fame
hood because of carcinogenic potential of
chloroform.
Sample on
top
Mobile
solvent
carries in
Differential
migration
Soluble
migrate
first
19.
20. DISTILLATION
Routine determination, rapid and sufficient accurate
method.
All low molecular weight fatty acids up to octanic
acids have vapour pressure at 100º C.
Strong non-volatile acid like sulphuric, the organic
acids are converted and can be distilled.
Distilled acids are measured by titration with NaOH
solution to phenolphthalein end point.
Approximately 70% of volatile acids distilled from
samples.