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SEWERAGE & SEWAGE DISPOSAL
I am obliged to (a) Mr. A. S. Knolles, B.Sc., M.Inst.C.E., M.I.Mun.E., Chartered
C.E., the Borough Engineer and Surveyor, and (b) Mr. L. H. Thompson, A.M.I.C.E.,
A.M.I.S.P., Regional Engineer, Greater London Council for the following reports:
(a) The laying of a new surface water sewer in Heath Road, Twickenham has
been completed, as also has the renewal and extension of a surface water sewer in
Station Road, Barnes and the renewal of the soil sewer in Fourth Cross Road,
Twickenham.
During the past year a number of new manholes have been constructed on both
soil and surface water sewers where the distance between existing manholes has been
too great to permit adequate cleansing of the sewers.
(b) On 1st April, 1967, the ownership of two fairly large sewers leading from
Station Road, Twickenham to the existing trunk sewers at the disused works south of
the Chertscy Road were transferred from the Borough to the Greater London Council,
the sewers falling within the definition of "Main sewers" under the 1963 London
Government Act.
As explained in the 1966 report, sewage from parts of the Borough which were
formerly in the County of Middlesex, is conveyed to the Mogden Works, Hounslow
for treatment. This works now deals with about 100 million gallons per day and the
purified effluent is discharged to the river between Isleworth Ait and the Old Deer
Park. During the year, the quality of this effluent has been consistently good, in fact
containing less than half the impurities permitted by the standards laid down by the
Port of London Authority which is the body responsible for pollution control in the
River Thames below Teddington Lock.
Improvement works, both at Mogden and the ancillary sludge disposal works at
Perry Oaks near London Airport, have proceeded satisfactorily and the odour nuisance
problem has been negligible at either works.
The construction of additional sludge digestion tanks is nearing completion and
their commissioning later in 1968 should provide further insurance against any smell
nuisance
Work is expected to commence shortly on the construction of a new pumping
station and rising main for conveying sewage from Ham to Mogden.
Sewage from the town of Richmond is treated at the Kew Works of the Greater
London Council. This works deals with flows less than one-tenth of that treated at
Mogden, but the effluent discharged to the River Thames has been of very similar
quality throughout the year.
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