APPLICABILITY OF BENTONITE FOR ROOVAL OF DETERGENTS FROM TEHRAN GROUND WATER AQUIFER

It has become increasingly clear in recent years that enironmental
degradation, if allowed to proceed unchecked, could result in serious and
sometimes irreversible damage to life on this planet.
In addition to the increased production of sewage due to the growth
of population, the per capita production of waste water is also growing, so
that in many cities it may amount to 600 litres per day per person. As there
is no sewage treatment plant in Teheran, so, many cases are known that
Teheran Ground Water aquifer has been polluted by domestic and industrial
wastewaters.
They include "Heavy metal and Nitrogen" and "Hard Detergent" and so
on. At present, the nearby rivers can not overcome the demands of 4~ million
population of Teheran and during peak demards the water supply of the city
is augmented by ground water pumped from a number of wells around the city.
From the Health aspect of view the solubility of many polynuclear
aromatic hydrocarbons (PAH), particularly benzo (a) pyrene (BP) can be
increased by the presence of fairly high concentrations of anionic detergents
and from an economical point of view residues of alkyl benzene sulfonate
(ABS), used as the surface active component in synthetic detergent mixtures,
cause foaming problems, particularly in turbulent reaches of rivers, and
reduced the efficiency of treatment plants, and interfere with sewagetreatment
processes, and self-purification of strems.