Process for Purifying Water by the Joint Action of Iron and Ozone.
Year: 1899

page_text: Date of Application, 5th Aug., 1899
Complete Specification Left, 5th May, 1900-Accepted, 9th June, 1900
PROVISIONAL SPECIFICATION.
Process for Purifying Water by the Joint Action of Iron and Ozone.
We, SIEMENS BROTHERS & Co., LIMITED, of 12, Queen Anne's Gate, West-
minster, S.W., Electrical Engineers, do hereby declare the nature of this inven-
tion (as communicated to us from abroad by Siemens & Halske Aktien Gesell-
schaft, of Markgrafen Strasse 94, Berlin, S.W., Electrical Engineers) to be as
follows:-
This invention relates to a process for the purification of water by the joint
action of iron and ozone.
Attempts to purify water by the simultaneous action of iron and air have
yielded good results only when decoloration of the water is the sole object.
A diminution of the dissolved organic matter and of bacteria cannot be achieved
as has been shewn by Piefker's experiments. The experiments of Vallin also
have shewn that purification of water from organic matter and a diminution of
bacteria in the water cannot be effected by the action of iron and air.
The action of ozone alone on water has not formed the basis of
purification process.
practicable
Our foreign correspondents have discovered that the united action of iron and
ozone on water produces an effect different from that of iron and air or of ozone
alone, for when this joint action occurs, the quantity of organic matter present
in the water is diminished considerably and at the same time bacteria are
destroyed.
This invention is advantageously carried out for example, by mixing with the
water to be purified iron or iron cempounds (organic compounds may be used)
and passing ozone into the water. Drums in which the water mixed with the
iron or iron compounds is subjected to the action of ozone, constitute appropriate
apparatus for the purpose.
The purifying action of iron and ozone jointly on water, which differs from the
effect known to be produced on water by iron and ozone separately probably arises
from the fact that iron oxide is first formed by the action of ozone on iron and
this oxide at the moment of its formation acts on the organic compounds and the
bacteria.
Dated this 5th day of Aust 1899
ABEL & IMRAY,
Agents for the Applicants.
Process for Purifying Water by the Joint Action of Iron and Ozone.
We, SIEMENS BROTHERS & Co., LIMITED, of 12, Queen Anne's Gate, West-
minster, S.W., Electrical Engineers, do hereby declare the nature of this inven-

page_text: tion (as communicated to us from abroad by Siemens & Halske Aktien Gesell-
schaft, of Markgraten Strasse 94, Berlin, S.W., Electrical Engineers) and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
1
This invention relates to a process for the purification of water by the joint
action of iron and ozone.
Attempts to purify water by the simultaneous action of iron and air have
yielded good results only when decoloration of the water is the sole object.
A diminution of the dissolved organic matter and of bacteria cannot be achieved
as has been shown by Piefker's experiments. The experiments of Vallin also
have shewn that purification of water from organic matter and a diminution of
bacteria in the water cannot be effected by the action of iron and air.
The action of ozone alone on water has not formed the basis of a practicable
purification process.
Our foreign correspondents have discovered that the united action of iron and
ozone on water produces an effect different from that of iron and air or of ozone
alone, for when this joint action occurs, the quantity of organic matter present
in the water is diminished considerably and at the same time bacteria
destroyed.
are
This invention is carried out by mixing with the water to be purified iron or
iron compounds and passing ozone into the water. The proportion of ozone
required depends on the nature and quantity of the impurities in the water.
Most iron compounds are suitable for this process; exceptions are organic com-
pounds of iron other than those which humic acid makes with iron, poisonous
iron compounds, and those which are too expensive.
The following example shows that the joint action of iron and ozone is effective.
A foul, coloured, turbid effiuent from a dye-works was divided into three equal
portions. a was treated for six minutes with 2.4 mgms. of ozone and afterwards
consumed 125. c.c. of decinormal permanganate per 100. c.c. when tested in the
well known manner. b was treated for six minutes with air and iron; it then
consumed 104 c.c. of decinormal permanganate per 100 c.c. c was treated for six
minutes with 2.4 mgms. of ozone and with iron; it afterwards consumed 80 c.c of
decinormal permanganate per 100 c.c.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:-
The herein described process for purifying water from organic matters and
bacteria by submitting the water to the joint action of iron or suitable iron com-
pounds and ozone.