The Morgan City daily review. (Morgan City, La.) 1916-1920, 1916-10-23

water Analysis VI VI AinAhS
used by residents of Morgan City
and St. Mary Parish.
ST. MARY
Albania, Well, 100 feet, engines
only .............. Safe
Franklin, Bayou Teche, city sup
ply $500
Franklin, Cistern, railroad sta
ton Unsafe
Morgan City, Atchafalaya River.
.............. Unsafe
Morgan City Atchafalaya River,
filtered, city plant ........ Safe
Morgan City Atchfalaya River,
filtered, high school ........ Safe
Morgan City, Atchafalaya River,
filtered, drug store ..Safe
Morgan City Atchafalaya River, I'M
Filtered raw water Unsafe
Morgan City, Reservoir Safe
Morgan City, Filtered river water,
downtown o"ie
MORGAN City, Filtered river water.
o- f1+ors Safe
Morgan City, Filtered river water,
| Morgan City, Filtered river water.
Filter No. l oa1e
| Morgan City, Filtered river water
Filter No. 9 ................ oa1e
city supply oa1e
Morgan City, River water treated
with alum -. ......... oale
Morgan City, Filtered river water,
city supply
Morgan City, River water, 5. +.
engines y i'S"ie
Patterson, Bayou Teche, city sup
NV Unsafe
Providence Plantations, Dug well,
20 feet Unsafe
Providence Plantation, Wooden
cistern ....... OhS"le
Providence Plantations, Reservoir
well, $50 feet UNSAFE
Providence Plantation Cistern, I'm
safe.
Vacherie. Galvanized tank, T. P.
Denot Safe
In an article on Sanitary En-
gineering by J. II. O'Neill, also
found in the Quarterly Bulletin,
which will probably interest the Re-
view readers as the filtration meth
cd of purifying drinking water, such
as the system now used by our mu-
nicipal plant, is thoroly described in
the article and Morgan City has re-
ceived special mention by this ex-
pert because IF her system of filtra-
ton.
The essential differences be-
tween rapid sand filters and the
slow sand type are: Q)higher rate
of filtration of rapid sand filter
viz, from 9O,OOO,OOO to 125,000,00O
gallons per acre per day; (2) smell-
er size of beds; (3) coarsergrained
filtering material; (4) method of
cleaning-hte filters when chopped
are cleaned by reversing direction of
flow-filtered water is forced
through bed from the bottom and
the dirt is washed into sewer; (5)
this method requires preliminary
treatment by coagulating chemicals.
This type of filter is often called
mechanical" filter, probably from
the fact that the early filters Of this
type had mechanical contrivances to
stir up the filter bed during the
washing period. Compressed air is
often used for this purpose, and in
some filters no means other than the
force of the wash water is used.
Alum, or sulphate of alumina, and
sulphate of iron, or copperas, are
the coagulating chemicals most com
monty used There is an unfounded
prejudice in the minds of great
many people against the use of these
chemicals in water treatment be-
cause of the mistaken belief that
their use may be deleterious to the
health of the people who drink the
water. No such effect has been OBJ
served among the millions Of people
in this country who drink water
treated by these methods. The iron
and alumna are removed during the
process of treatment. In some cases
the natural alkalinty Of the water
has to be increased by the addition
Of lime in order to decompose the
the coagulant passes off with the
coagulant and to insure that none Of
treated water.
A plant using this method would
COMPRISE a coaeulating reservoir or
sedimentation chamber (sometime