The Detroit times. [volume] (Detroit, Mich.) 1903-1920, 1916-05-10
DETROIT TIMES

bacteria In the sewage will be neces-
sary TO reduce the pollution In the
500 b. coli per 100 cubic eentimeters
for average conditions. This can
best he done by the use OF a dis
,nfectant such AZ hypochlorite of
I. Five genera. projects for sew
age treatment have been considered
Cal Local shallow tanks located
disinfection. and q cast iron force
main through which siudge from the
individI,ai tanks would be pumped
should be treated with digestion
OBJ Treatment works below the
sfK ssht5 ts M Rive. Ps Rcas. r With Q.
system OF collecting sewers to de-
liver al: dry weather sewage to .
single plant consisting OF Imhoff
Sludge TO be disposed Of for Milling
a. a fertilizer filler.
wayne and at connors Creek as SSrs
tanks combined with disinfection. and
the necessary collecting system OF
Cd Treatment works at Fort
Wayne and Fairview on the river
front and future plant on Con-
fsSss Comb eomSn.S With %hS
Each plant to have It's own system
OF collecting sewers. Sludge to be
disposed OF by nlling low lands. or
BY inein s or sold a. q ferti-
confined with d!sinfectioS: treat
points point works fSar e then. located on The at rS ss
front at Fairview. Orleans street,
Twenty fourth street and Fort
ton Of Roliin street end Junction
plants located on Lvernois avenue
and on Connors creek. Each plant
to have It's own system OF intercept
disposed Of Wy incinsrstion. " DC
s. Preliminary studies indicated
that general projects CdD and te)
were the two most worthy OF devel-
IN detail an in Part ~ w Of this report.
As between the sedimentation pro-
1ect I'D and the nne screen project
the most desirable. and considering
the annual cost for hxed charges and
for operation and maintenance. 1t Is
also the more economical.
6. IL Is therefore recommended
that treatment by sedimentation COM
bined with disinfection he adopted
as the most economical method of
gree necessary to meet all present
and future requirements.
The first cost Of a complete Install
alton adequate for a population OF
Wayne and at Fairview, together
with the necessary system of co..
lecting sewers. Is estimated at So
091.000. The total annual charge. in
Guiding interest at ~ per cent,
amortization. operating cost and
maintenance. Is estimated at $5l7.-
4So or 5i.5 cents per capita. =
T.. In regard to the second part
OF the problem as to what expense.
would he justified for sewage treat
answer in terms of money a.one.
However IT Is believed that. aside
from the International features OF
the problem, the combined benefits
which would accrue from a more
cleanly water front. purer, water at
Fairgrounds. reduction In typhoid
and other water borne diseases due
to the use of sewage-laden water
along the river front: betterment of
pa.ities below the city. and the pro-
lection OF Detroit's water from gross
sewage pollution at times when the
Detroit river flows backward. amply
Justify the expenditure required for
sewage treatment works as above
outlined. In round figures, the cost
would be about six million dollars.
and In my Judgment the expenditure
OF this sum would be justiiab.e.
The above replies to the specific
data and detail studies presented in
/ Parts H. III and ~ OF this report
Respectfully submitted,
CLARENCE w. HUBBELL.
Consulting Engineer
Referred to Committee on Sewers.