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47
through a six-inch pipe to the sludge beds. The sludge accumulating
in the remainder of the tanks flows by gravitation to an ejector
chamber, and is lifted by means of two 25-gallon ejectors to the
sludge beds beforementioned. The washout pipes from the filters,
feed pipes to distributing chambers, and high and low level Humus
tanks also gravitate to the ejector chamber, and the resultant sludge
is lifted to the sludge beds. The sludge is allowed to settle, dried,
and is then disposed of locally.
Analysis of Effluent.
Representative samples of crude sewage, tank effluent, etc., are
taken daily by the Sewage Works Manager, and the following records
kept at the works:
Tables showing monthly summaries and treatment, also
monthly averages of analysis.
Diagrams showing variations in flow, rainfall, and the
strength of sewage.
The final effluent under normal conditions shows a high percentage
of purification and is very satisfactory.
R. H. JEFFES,
Assoc.M.Inst.C.E., M.I.M. & C.E.
Engineer and Surveyor.
Mr. Hunter, your Sanitary Inspector, has since September last,
been on military duty with his Division, and consequently his valuable
services have not therefore been available.
Mr. Jeffes, your Surveyor, has been appointed temporary
Sanitary Inspector during his absence, by this means the work of
the department has been carried on with its usual efficiency.
My best thanks are due to Mr. Elliott, the clerk to the department,
who has made himself master of the work, who has always
rendered me courteous, cheerful, and valuable assistance, under
great difficulties, throughout the year, indeed, the department could
not be efficiently carried on without his aid.