Clean drinking water is
significant for our survival. Underestimating its importance is
sheer foolishness. Despite of all these facts the water gushing out
of our home taps is now not at all safe for drinking without any
purification measurement taken. More worrying fact is that this
quality of water is deteriorating with each passing day. Even the
bottled water which we purchase is not safe for drinking. It
contains high concentration of pesticides. Even water samples have
high content of some extremely dangerous pollutants like residual
pesticide, heavy metals, organic matter.
Let me share another fear-provoking fact about
the rivers of Asia. Asian rivers have three times as many bacteria
from human waste as the global average giving them the distinction
of world’s most polluted rivers. In fact the quantity of lead (Pb)
was also found to be 20 times more than those of industrialised
Main culprit behind this unarguably is Sewage
which is chiefly household waste toilets, baths, showers, kitchens,
and sinks draining into sewers. Off course by now word STP (Sewage
Treatment Plant) to tackle this perilous situation must be striking
your mind. It is often known as simply wastewater treatment.
Certainly, it is the best choice to bring waste water in its
pristine state. In STP’s natural process of decomposition is
imitated in an artificial way to fasten the pace of waste
decomposition. In year 1870, Sir Edward Frankland developed a method
Chemical treatment method which is even quicker than natural
The process of sewage treatment involves various
phases like Pre-treatment, Primary treatment, Secondary treatment
and Territory treatment. In this blog, I will not go in to much
depth about the details these processes. These three steps
collectively remove nearly all contaminants from waste water.
Primary treatment removes cans, rags, sticks, plastic packets,
sand, grit, stones, broken glass, fat and grease. While in
secondary treatment with support of MBBR (Moving Bed Biofilm
Reactor) technology sewage containing biodegradable soluble organic
contaminants (e.g. sugars, fats, organic short-chain carbon
molecules, etc.) are removed. Tertiary treatment which is also
known as “effluent polishing” makes treated water fit for release
in water bodies like sea, river, lake, wet lands, ground, etc.
Tertiary treatment also mitigates Nitrogen, Phosphorus and
biological contaminates which otherwise can cause algal blooms or
Eutrophication in water bodies.