الفهرس 
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Abstract
•Treatment of water and wastewater contaminated with aniline
or ~ts tol~idine derivatives was the main concern in this re-
seal~ch •
Fresh water was treated by active carbon
adsorption,
while
wastewater was treated biologically.
A good part of this work was devoted for the development of
a simple,
quick and reliable method
the determination of
for
aniline.
A colourimetric method depending on diazotisation of
the present aniline,
with excess nitrous acid,
followed by cou-
pling with excess coupling component was developed.
The absc,r-
bance of the colour formed is a measure of
the original
,:on•••
centration of aniline.
Absorbance measurements should, however,
be carried out at the wavelengt~ of maximum absorption.
of the coupling
component and the conditions of the determjna-
t i .:.n,
especially the level of aniline concentration,
tion of the other reagents, time of reaction and its limits, were
settled after numerous trials. The developed method, where phenol
was chosen as coupling component,
showed satisfact6ry accuracy
and pr e.: i si ’:In.
After proving successful for aniline it
was ap-
pI i ed t Cl c’-,
m- and p-toluidine, eventually after the proper ab-
sorption and calibration experiments.
The results were equally
L-~
’Satisfactory.
There is some reason to believe other diazotisable
amines may be determined in a similar way.
In case of aniline which may be found in wastewater contain-
ing biodegradable organic materials, a part of this work was con-
cerned to find the effect of the presence of aniline on the
biotreatability of this waste,
i.e.,1 the effect of the aniline,
and its concentration on the biodegradability of the organic mat-
ter
in the waste,
and whether the amine itself was biodegraded
and removed from the wastewater by biological treatment.
Oxygen uptake experiment showed the following:
1.- Aniline present in organic wastewater reduced the rate
of oxygen uptake of the waste.
creasing concentration of aniline.
This effect increased with in-
The inhibiting effect
of aniline was,
howeve”I” ,
l”educed
when using a culture which is ~cclimatised to aniline, e.g., one
taken from a previous experiment,
and not from ordinary domestic,
sewage, though the inhibition was not eliminated completely.
8.- Aniline itself was biodegraded and was removed from the
wastewater aniline mixture by biological activity.
This removal
was accompanied by an increased consumption of oxygen.
4. - Remc.val .:.f ani I ine was somewhat retarded at
the ear-ly
stages of treatment,
treatment.
but hastened at advanced stages of th«=:”
Another section of this work was concerned with adsorption
experiments carried out on aniline and toluidine solutions. Three
.~.
types .:.f .:al”bc,n were e:t;amined as adS01”bents; Anthl”a.:ite, which is
occasionally used in municipal water works as a filter media,
powdered active carbon,
and granular active carbon.
Anthracite
was not an effective adsorbent while powdered and granular active
carbon ~e~e useful.
,,-