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46
filters are fed from two reinforced concrete distributing chambers,
which enables the sewage to be properly regulated as desired. To
allow for growth of population, power has been obtained to construct
two additional filters when necessary, these filters will be 88ft. in
diameter.
The effluent after treatment by the percolating filters flows
through open channels through two Humus tanks constructed of
reinforced concrete, the capacity being about 43,000 gallons. The
construction of these tanks follows closely on the lines of the
Detritus tanks, provision being made for the suspended matters,
which are intercepted in their passage through the tanks, to be
discharged by the head of water ini the tanks to the sludge drain.
New Effluent Outfall Channel.
After passing through the Humus tanks the effluent, if desired,
may be again treated on the existing Contact Beds, Nos. 1 to 4, or
sent direct to the Hogg's Mill River by means of a new high-level
channel which delivers the effluent above the level of the water in
the river; a great improvement on previous conditions.
Storm Water Treatment.
The excess of sewage above three times the dry weather flow
is dealt with on about four acres of land which has been reclaimed
and suitably graded and prepared, also through the existing six
contact beds. A new open outlet channel to the first four beds has
been constructed, which will enable these beds to properly drain and
aerate. The effluent will flow along this channel and through two
low level Humus tanks of identical size and construction to the
high level Humus tanks and thence over the present irrigation land
to the Hogg's Mill River.
Sludge Beds and Ejectors.
These are 19 in number, each 50ft. by 20ft., and are constructed
of clinker 12ins. in depth, graded to three different sizes
with underdrains which discharge into a drain leading back to the
pump well. The beds are fed from a central open channel 12in.
wide with suitable inlets to each bed. The sludge from the
Detritus tanks is forced by the hydraulic head of water in the tank