Groundwater in it’s
natural state is made up of dissolved substances including gases. These
contribute greatly to it’s quality. The surrounding environment (Formations),
anthropological and bacterial activities influence it’s quality as well.
Below is a rundown of
factors that determine the quality of any groundwater:
They can be
categorised into:
1. Physical factors;
2. Bacterial factors;
3. Chemical factors;
4. Anthropological factors.
Physical factors
can be easily seen with the eyes without first being analysed in the
laboratory. They are apparent to the physical senses of sight, smell, taste and
in some cases, touch. It can be known physically if a groundwater is polluted
or not by Colour changes, Odour,
presence of suspended materials. The presence of suspended materials make
the water appear cloudy. Commonsensically, no sane person will like to consume
anything, let alone, water that is not appealing to the eyes.
Chemical pollutants are determined by the mineral composition of the
underlying and surrounding Formations. It varies in concentrations and
proportions. Some are localized, while some are regional. For instance, regions
where limestone is predominant tend to
have hard water which is of no economic use due to the high percentage
of Calcium and Magnesium ions prevalent in the groundwater. Likewise, places
rich in Coal deposits, Hydrocarbon deposits such as Crude oil, Tarsands have
Sulphur and other harmful compounds prevalent in their groundwater. Chemical
pollutants are determining factors on the pH of the groundwater. These
pollutants include, but not limited to, Calcium, Magnesium, Chlorine, Lead,
Iron, Copper, Phenols, Zinc and Sulphur.
Bacterial factors: Bacteria thrive well mostly in places where oxygen
is available. So the amount of Dissolved Oxygen Concentration (DOC) in the
groundwater may determine whether bacteria will be in it and the amount or not.
Deeper boreholes usually have no bacterial activities in them because no
bacteria can thrive at such depth. Temperature increases with depth while Dissolved
Oxygen Concentration reduces with depth. Unsanitary sewage disposal methods,
defecation in open water bodies and water channels and dump sites are main sources of bacterial contaminations
to groundwater. The predominant bacterial pollutant in groundwater is Escherichia
coli, commonly known as E. coli .
Anthropological factors: Industrialization and urbanization has posed
great danger to the ecosystem. While trying to better lives by industrialization,
mankind has ended up releasing toxic wastes into the surroundings. Some of
these wastes like Brine, Metals, Ammonia, Sulphates, Plastics and Rubber
by-products cannot be safely disposed off, hence, hole is bored into the ground
and is discharged directly into the ground thereby polluting the nearby
aquifer. Wastes discharged through this means cannot be effectively controlled
as at seeps across the underlying and surrounding Formations. Brewing companies
and Oil companies release most of their wastes directly into the ground. Mining
activities, tank and pipeline leakages also pollute the groundwater.
However, the baby
cannot be throw away with the bath water merely because it soiled the bath
water. Polluted groundwater can still be remedied depending on the degree of
contamination and the nature of the pollutant.
The treatment includes:
Disinfection:
This involves using Chlorine, Ozone, and Flourine in a calculated proportion.
Coagulation:
this involves adding of alum to make the dirts to form larger clumps and
facilitate sedimentation.
Sedimentation:
Here, heavier particles are allowed to settle under gravitational effect
and then decantation takes effect.
Aeration:
In this case, the water is exposed to air so that encourage precipitation. This
is for water polluted with Iron and Manganese.
Once precipitation is over, it can be decanted easily.
Filtration:
This helps to remove bacteria and other pollutants like organic matter. This
is the most common of all techniques.
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ReplyDeleteThanks man. I appreciate. Please stay tuned for more
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