Water Authority is also responsible
for the collection of waste water
and disposal in the State of
Kerala. The Authority has separate system for sewage
and storm water collection.
Waste water includes Sewage and
Sullage. Sewerage implies the collection of waste
water from domestic sources and conveying it to
Sewerage Treatment Plants (STP).
At present, sewerage schemes are under operation
only in two cities in the State i.e. at Trivandrum city
region and a part of Cochin. The
work is in progress at Guruvayoor for implementation.
Trivandrum Sewerage Scheme
1938, action was taken for investigation of a "Comprehensive
sewerage Scheme" on modern lines. The Thiruvananthapuram
Corporation area has been divided into 7 Sewerage Blocks
viz. A to G for the execution of the sewerage scheme.
Sewerage facilities existing in A, B, C, D (Medical
College-Kannmmoola zone and Medical College
campus only) and E ( part of Peroorkada
Zone only) Blocks.
The scheme for the disposal of sullage and sewage is an
underground system based on principle of separate
system. All the sewerage blocks had been considered
to be provided with sewerage network
draining into a main pumping station,
where sewage would be pumped through
pumping mains to Treatment and Disposal works situated
at Valiyathura. The disposal system adopted is land treatment.
This system covers an area of 13.84 sq.km comprising
most important portions of town such as
Kowdiar, Vellayambalam, Vazhuthacaud, Thycaud,
Thampanoor, Pazhavangadi, Puthenchanthai and
Palayam. The main pumping station for this block is located
at Kuriathy, where sewage from this
entire area is collected and pumped
out to the disposal works at Valiathura. Three
sub-pumping stations were also proposed in
this block to lift the sewage from Mudavanmugal,
Arannoor and Thaliyal areas. The scheme
was comissioned in 1945.
For effective disposal of
sewage from this block the system comprises of five
area of 5.51 sq.km. It comprises areas of the city such
as Sreekanteswaram, Pettah, Kaithamukku, Pattom Valley,
Nanthencode etc. with pump house at Pattoor. The system
comprises three intercepting sewers.
area of 2.43 sq.km Commissioned
in 1970. All the sewage from this block is collected at
the main pumping station at Enchackkal. The system comprises
two intercepting sewers.
College and Kannammoola areas. Partially commissioned
during 1994. There are two pumping stations viz. the Medical
College lift up pumping station catering the needs of
Medical College complex and the Kannammoola main
pumping station which discharges to the sewage farm at
a small portion of the Peroorkada-Ambalammukku and Jawahar
Nagar area is commissioned in this block during 1990.
There is one lifting pumping station in this block at
Sasthamangalam near Pippinmoodu which discharges sewer
into the main sewer (IS-1) in block A
which ultimately reach the Kuriathy main pump house.
proposed Trivandrum Sewerage scheme cpmprises of
7 blocks. The first 5 blocks covering a total area around
30% of the city area of 75 sq km. This covers only
40% of the total households. The remaining two blocks
has no drainage facilities at present. The urban
growth has been very rapid and about
80-85% of the water supplied is returned to
public drainage. The sewage from
the pumping stations at Kuriathy, Pattoor,
Enchakkal and Kannammoola is
pumped to the stilling chamber
at Valiyathura and is disposed through sewage
farming. The sewage farm is maintained by the Diary Development
Department and fodder cultivation is done there.
In Kochi the entire area has been divided
into 3 zones, Ernakulam South, Ernakulam North and Palluruthy-Mattancherry
of providing sewerage facilities, Ernakulam South Zone
is further divided into 5 Blocks. Block A
and small portion of the Block B has been commissioned.
Sewerage System Components
connection fee and deposit amount realized from the consumer,
there is no revenue generation from
the schemes. Sewerage is a service that is
provided to selected areas. Apart from Kochi,
Thiruvananthapuram and Guruvayoor, the KWA
have concrete plans to expand the system to more areas.