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40
Bacteriological Examination.
Number of organisms per CC capable of growing on
alkaline nutrient jelly at 20° C in 4 days, counted by
aid of pocket lens
2 days 56
4 „ 88
Smallest quantity of water in which growth occurred
with production of acid and gas in bile-salt glucose broth
(1, 5, 10 or 20 CC)
Acid & Gas
in 10 CC
Nature of organisms found
in this growth
An organism of Coli Group,
but not the true B. Coli.
Spores of the Bacillus enteritidis, Sporogones
in 150 CC Absent.
„ 350 CC „
„ 500 CC „
John C. Thresh.
The only houses in the District supplied from wells are one or
two isolated groups of cottages in outlying parts. During the year
two wells have been closed, the water being found to be contaminated
on Analysis.
Disposal of Refuse.
(a). Sewage Disposal.
I am indebted to our Engineer, Mr. Reginald Brown,
A.M.I.C.E., M.S.I., &c., for the following particulars as to the
Disposal Works and Farm.
The Sewage enters the Disposal Works at two different points.
What may be termed the high level outfall sewer takes the Sewage
from the District proper. This enters the works by passing through
a small chamber controlled by valves and thence into and through a
receptacle in which is fixed one of Smith's Patent Revolving Wire
Screens.
This screen consists of a water wheel—driven by the momemtum
of the Sewage—which causes an endless band of wire net to revolve
slowly, thus catching and lifting out all suspended matters beyond a
certain size. A brush revolving in an opposite direction cleans the
net as it passes and the solid matters are cleared to one side and
removed by manual labour. The sewage then passes through a well,
inside the liming house, and from thence through two valves into one
or the other of two small detritus tanks covered with corrugated iron.
These tanks have a total capacity of 24,000 gallons. At the centre
of the length of these tanks scum boards are fixed, the bottom edges
of which are at a distance of 24-ins. below the level, the upper edges
being above the water level; the outlet end of the tanks have also
scum boards projecting to a distance of 12-ins. below the water level,
and the top edges of same, of course, being above the water level.
The Sewage passes under these boards and over a lip in a
continuous stream into a carrier.