G.L.
Sudheera Nayanamali
Post 3
Date of
visit: 27/08/2012
Water
treatment plant & sewage system-Raddolugama.
At the
beginning of our 3rd week, we went to see water treatment plant,
Raddolugama. It took more than one hour to reach & we enjoyed very much while
going there.
Raddolugama
water treatment plant commenced in 1987 to supply drinking water to the housing
scheme of more than 2000 houses. At present, it supplies 4500m3 of
water to 2481 houses of the scheme, Wijaya
kumarathunga memorial hospital, police station, army base Seeduwa and Biyagama
indrustrial zone.
Plant now
contains 2 treatment plants .The second one opened in 2008.
Treatment
process
1.pump from the river
The water
resource for plant is Dandugan oya, a branch of Attanagalu oya. Water is pumped
to 2 large wells near to river, and from there it pumps to the plant along
8kms.
2. Aeration
Water is whirled
in the air to mixed with O2. Then water is oxidized and other
harmful particles are broken down. During aeration Al2(SO4)3
and Ca(OH )2 is added. Positively charged ions combine with mud particles and
form mud floccules
3.Sedimentation
During this
process mud and other particles are separated from water.
4.Filtering
Mud free
water then comes to filter tanks. Small particles and parasites are retained in
the filters. Clear water is then released in to storing tanks.
5.Storage
Filtered
water is stored in two large tanks .The tanks are covered by granite chips to
avoid get heated from direct sun light.
6.Chlorination
Chlorine gas
is bubbled through the water in storage
tanks until the concentration reaches 1mg/L.
7.Distribution
Pumps to
regional tanks and then to houses.
Water is
checked one in two weeks in regional lab.
Though it
seems to be easy as above, producing drinking water is a complex project. If
one mistake occurs, it can cause a mass disaster. And also we should protect
drinking water.
Otherwise all have to
suffer a lot.
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