The Salt Lake herald. [volume] (Salt Lake City [Utah]) 1870-1909, 1895-09-26

Engineering and Mining Journal
touches upon the success Of the De
Lamar plant and calls attention to the
improvements adapted there, one of
which is the sand filter, placed in the
chlorination barrels. The Journal
gives the early history of the process
and then continues:
1.-THE next step in progress was to
shorten the time required for chlorina-
ton by the use Of the revolving, lead
lined barrel These barrels at first
tons, now five and ten tons. They are
charged very quickly. The chlorine is
generated in the barrel by the use OF
calcium chloride and sulphuric acid.
When chlorined the charge is, as for
merly, dumped on sand filters and
washed, but this washing was an eX-
tremely tedious operation, especially
when the sand filter became clogged
with the calcium sulphate and fine iron
oxide from the charge. Various de-
vices were adopted. some with great
measure of success, to. shorten the
time Of washing on the filter, and to
effect a more perfect washing of the
charge. Even with these it still re-
quired a great number of filter tanks.
The next step was to wash in the
barrel. This was done first at Deloro,
Ontario, the wash-water being emp
tied out of the chlorinating barrel
with only a very little of the charge
mixed with it, so that the most of
the charge remained in the barrel I'M
til thoroughly washed. when it was
carried away by a stream of water
to the waste dump. The small amount
that went out with the solution went
into a settling tank and then the So
luton went through filters. This
greatly lessened the use of filters, but
it required a good deal of time to
wash the charge. Efforts were then
made at continuous washing by
pumping water through one trunion
and allowing it TO flow out through
the goose-neck which connected with
the other trunion, but this was slow
on account of the necessarily small
size of the pipes that passed through
the trunions.
The next step was to dump the en-
tire charge into a separate filter yes
sci and to wash under pressure, but
this has also some difficulties, among
which may be mentioned the irregular
washing of the charge. The water
will find free passages and will follow
them and not pass through the re-
mainder of the charge. There are also
other difficulties which it is not neces-
sary to mention now.
John e. RothweH suggested, and
has since carried out practically on
a very large scale, the washing and
filtering in the chlorinating barrel
itself and has found this am excellent
and rapid method Of doing the work
In the first experiments he used an
asbestos filter. but it was difficult to
get serviceable asbestos cloth, the life
of the cloth being short and the cost
high. Mr.. Rothwell then built bar
rels with a sand filter in them and by
the use Of pressure he is enabled to
wash the charge very rapidly,
thoroughly and economically:'
Captain DeLamar will not go out to
Mercur this morning as was antici-
pated would be the case but instead
he will remain in the city for the
purpose of giving his personal atten-
ton to some matters of business. He
will probably visit the camp on Fri
day The gentleman was kept busy
yesterday receiving callers. AS usual,
there We're many with properties to
sell. AS yet the captain has not taken
up any of the propositions submitted
for his investigation