Richmond dispatch. [volume] (Richmond, Va.) 1884-1903, 1899-03-22
baltimore sun.


Cincinnati has just spent $500 on an
governmental hhering plant, and the re-
port of Mr.. c. w. Fuller, chief chemist
and bacteriologist. on the result IS now
published. Two methods were tried-the
one involving subsistence In reservoirs pre-
uared for the purpose, together with mira
fion through sand the other involving the
use of smaller filters with a cOagulalns
material 10 aid in catching impurities htlu
i'm suspension. At certain seasons the
water of the Ohio river is very turh!d' On
January TO- 1925 for example, the suspehu-
ed matter in the unsubsided Ohio river
water at Cincinnati constituted 2S55 paris
per million. while six months later the
inpurities were but y parts to the million
II is found that the sand filter would be
ioafRcient ON Ig2 DAYS of the year, unless
aided by a preliminary period OF supsl-
dence. Tho water of the river must DV
,iioyced IN stand for from one TO two tuil
1avs before fl "a passed through the sand
filters. if a fair result IS wanted III
fact" saws the report the S"lu ii''Ci
could not have been used with success TOT
,., dovs at a time i'm 1898, except during
the months of June, July, September ana
October" Subsistence for three days was
f,und to remove 70 per cent OF suSpehu-
an matters present in the river water,
S,,bsidence and filtration in snort II useu
t,,,.tber Give a satisfactory result AZ an
a.nense of about $l0.35 pc mlinoh bailo4io.
,rbe american system win the uS0
of coorulating chemicals TO ana 'he pr
ceeses Of subsistence and hltra'lon - ~
ferred by Mr.. Fuller as beihB ies va
dcult TO operate. somewhat ome"p'i' ~
suGstantiailv as satisfactory as the
,,.,,,,d ohovo described. This system
permits the use of smaller nlterS "n'
greatly increases the speed OF the PIo-
cess of filtration The chemicdl enlpios
cd preferably IS sulphate oil aiuiii'l''
which costs IA cents per pound. inns -
dissolved so as To form solu'iVn Va ~
grains Der gallon. and mixed Win VI.
water TO be purified Immediately al'ci -
leaves the subsiding reservoir Inc S"i
Donates naturally present III me ~
water decompose the sulphate oil aluiiii ,,'-
forming aluminium hydrate, q While' Jeli'
like solid. which catches the impurities
much after the manner in which the Whi1'
of am egg clarifies coffee The coasu
Jared matters are allowed 20 subside' Oh
NAV be removed by hltration Inc car
bonates of lime and magnesia IN the rive
| water are IN this process converter nv
eulphates but the quantities are so siiiH'
| mat they are not Injurious TO heail !.
| the cost Of the American system WIZ
the use Of the suiphate OF aiumlna' WOW
| lac 81 SO per million gallons or soihem ~
| is than the system previously descrlpsu
+, ia possible. OF course, to combine tN'
| two svstems-to use the coagalating ma
| serlal i'm connection with ordinary suDsl
&c and sand filtration when the Iatte'
/ ''.,.ossos do not. at certain times OF th'
~ olive perfect results. Both methods
win ana without the coasuiant-aIe pro
,,o,,nced bacterlologically efficient II wei
,,anaeed." Either removes. IL rs stated
| over 80 per cent. of the river "a.er D"S
....,'.',,a tho alters be germ-pr0of, although
,,rocticollv speaking, they would be very
| ,.D. ,.lN So