Grand Forks herald. [volume] (Grand Forks, N.D.) 1916-1955, 1917-06-09
1s,020,0 600. i $780, 900
Total Water COLLECTIONS -. $5.275.73
- Supervisor Of Filter Report.
H0nara hlA MAXor and CITY, Coiinnii.

Honorable Mayor and City Council:
init my report on ae't thy e eftiecfeney 81 'e the
municipal filtration plant for the month
Of May. 1917. During the month sam.
days.
The tabulated report shows that the
average number OF bacteria in the raw
river water was 2s4.5, while the average
60 aS"09 The = r saa . ,ysf'e eati eiesrsS T sseset %ss
was 1850. a high removal efficiency
when the small. number Of bacteria in
the raw water is taken into considera-
type were found in i &C. Of raw river
water upon each day examined. and
upon zero number 81 days in the tap
ceiient condition from a ni sae aesh On ea
standpoint throughout the month.
The total amount Of alum used during
the month wa $50 lbs. the averase
Of hypochlorite used was 27s lbs, the
average per day being 8 lbs. The total
number Of gsllons filtered for the month
Day s bstns ssc s J av: re t nitsrsd w per-
washed Is times during the month.
Due to the fact that we AVE but two
hours s~edimentation period at present.
than usual care and slightly more hypo
is necessary. to be on the safe side.
~ At st. the time tn. .oftenins plant was
e Ct there was some ne''I QUESTION ess my as sou to
whether the water became acid during
time Of high water. Search through
past records reveals the fact that the
although the 'alkalinity has become very
Il tn present. sent Xix sis. iimt - a aster nina ans
hay h:y' e sss nix" ait:i,ni A. no e. tine, Il: t Inv . g. |,
been below 90 parts per million. which,
II composed Of calcium ana magnesium
b~icarbonates, 10 sufficient to decompose
tLA htrAAA< A~ANAk - I,-
ing the. ysar. This would indicate that
u: d to e''n neutraiis ss' The a .rsls S.se q 70, tR Rs.
water.
upon en'i he .% .sE .ssss n' ys.. ess1 m sna
II. has been found that due to their
width currents go through them and
the subsistence period that ii. should.
they hold approximately 100000 ssi.
ssss.. S Spon tss{, t xst. a.x -. 'sS SSax 3 7 by;
tthnr.oush the basins ip ~ 70 : hours:
cheaply and nov 10 the time to do It.
in each Pssin. and : hume, iar,s enough
the center wall. would make the plant
e er.P;sy' AZ f. t t,s. x.: : v coa;a q e tSss 5aaagg
one basin. both basins 81 psraiien. Or
both basins In series. This would sive
subsidsnss PERIOD q spRrcxirst2ly
thus, Joined. the city would, ave money
alum and the tap water would not
e g turbid during tho spring freshets.
ment 10 the fact that the grains Of sand
viii not become coated with calcium car
Donate from the sQftening plant, 90 rap
idly. When the grains OF sand grow.
become useless and must be re-
placed. As Red Wing sand 10 used, such
replacement costs considerable money. !
This work can be done by the city if
the Pittsburgh Filter Company do the
work. they. WI maks 9 charse Of from
csmp.ny pisns; DO not NOV any b.tlins
Of sedimentetion q. hume. 10 that they.
year whom the thirty-day test i the
plent 10 iBad0ssI have no doubt that the
efsluent will easily comply With the
standafds adopted for the city o. Grand
Forks. However during this spring Of
the Iyesk. the plant you'd have. hard
ttEhS 70 CONFORM 20 standards. Thet 10.
used. rs WheYeaa, Wsfe these improve
SSaSteiiy IS sssels 2ssins a. sstirs