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IO
PUBLIC CONVENIENCES.
The Council have had the construction of these very
necessary conveniences under their consideration, but
owing to the conditions at present prevailing the matter
is held in abeyance for the present,
SEWAGE DISPOSAL WORKS.
The scheme of extension for the treatment of the
Greenhill Sewage from the Harrow Urban District, in
order to do away with their Sewage Farm contiguous
to ours, is now practically completed.
The chief features of the scheme has been the construction
of an additional detritus and sedimentation
tank with a capacity of 156,000 gallons. In addition
to this 6 circular sprinkler filters, 65 feet in diameter and
5 feet deep, filled with clinkers, and with bottoms of
aerating tiles, have been constructed. Also a detritus
sedimentation tank for the treatment of storm water of
a capacity of 140,000 gallons, and a storm water filter
bed with an area of 650 yards super and 3 feet in
depth.
In addition to these new tanks and filters, 4 beds
have been constructed for sludge treatment. These are
each 38 ft. x 12 ft., with an effective depth of 6 feet, and
provision for draining off the supernatant water to the
sludge wells. Pumping plant for re-treatment in the
detritus sedimentation tanks is provided to these beds.
All 4 beds are covered over with a roof, and sliding sides
are attached to keep out the weather, so as to facilitate
the better drying and treatment of the sludge.
The works, as a whole, now consist of tanks with a
total capacity of 1,000,000 gallons, and three 80-feet and
sixteen 65-feet circular sprinkler filter beds.
The effluent discharged from the works has always
been satisfactory, and no complaints have been received
from the river authorities.
The greatest possible credit is due to our Surveyor,
Mr. H. Walker, who designed and carried out the scheme
entirely from his own ideas, and whose interest in the
success and efficiency of the works is untiring.