Improvements in the Treatment of Sewage or other Foul Water by means of the Liquor Obtained from Iron Pyrites Beds.
Year: 1892

page_text: Date of Application, 30th July, 1892
Complete Specification Left, 1st May, 1893-Accepted, 2nd June, 1893
PROVISIONAL SPECIFICATION.
Improvements in the Treatment of Sewage or other Foul Water by
means of the Liquor Obtained from Iron Pyrites Beds.
JOHN HOWARD KIDD of Duke Street Lower Broughton Manchester Engineer,
do hereby declare the nature of this invention to be as follows:-
I take iron liquor in its crude state containing preferably about 16 per cent. of
ferric sulphate & from 2 to 5 per cent. of ferrous sulphate adding sufficient lime
water to precipitate out all the iron as hydrated ferric oxide & hydrated ferrous
oxide. This quantity can be easily calculated by anyone having the necessary
chemical knowledge. Considering that 3 grains of metallic iron per gallon would
be a suitable quantity to add to the worst sewage, an amount of the liquor is added
to the sewage containing this proportion and the equivalent amount of lime water
to precipitate out all the iron from it as hydrated ferric oxide & hydrated ferrous
oxide is added to the mixed sewage or foul water and iron liquor.
Dated this 29th day of July 1892.
JOHN HOWARD KIDD.
COMPLETE SPECIFICATION.
Improvements in the Treatment of Sewage or other Foul Water by
means of the Liquor Obtained from Iron Pyrites Beds.
I, JOHN HOWARD KIDD of 43 Victoria Buildings Manchester in the County
of Lancaster, Sanitary Engineer, do hereby declare the nature of this invention,
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :—
The liquid which escapes from iron pyrites waste heaps may be utilised in the
purification of sewage and other foul waters.
According to my present invention I employ this liquor in the manner herein-
after described for the purpose of purifying sewage, after such liquor has been
exposed to the air for a sufficient time to have partially converted the original
ferrous sulphate into ferric sulphate. The liquor will be suitable for my purpose
when it contains for example 16 parts of ferric sulphate and from two to five parts
of ferrous sulphate in every 100 parts of the liquor.
It has been found experimentally that in the case of ordinary town's sewage, an
addition of hydrated peroxide of iron in the proportion of about three grains of
metallic iron (Fe) to the gallon of sewage will suffice to effect its purification. I
therefore employ about this proportion or more or less according to the nature of
the sewage to be treated, or say for example, one gallon of the pyrites liquor of the
strength hereinbefore set forth, to every thousand gallons of sewage.
Before, after, or simultaneously with the addition of the pyrites liquor to the
sewage, 1 prefer to add a sufficiency of lime or milk of lime to precipitate the iron
as hydrated oxides. It is well known that such hydrated oxides are more active
and efficient at the instant of their formation or in their nascent condition, and
according to my method of procedure, I form the hydrated oxides in presence of
the sewage itself and thus obtain the best possible result.
It will usually be found better to add the lime or milk of lime first to the sewage
and thereafter to add the iron compound herein before described to effect the desired
purification of the sewage or foul water.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is―
1. The treatment of sewage and similar foul waters by the addition thereto of the
liquor from iron pyrites waste heaps and of lime substantially as and for the
purpose hereinbefore described.
2. In a process for the treatment of sewage and similar foul waters, effecting the
purification by means of hydrated iron oxides derived from the liquor of iron
pyrites, substantially as hereinbefore described.
11
ليمة
י
די
1000
WILLIAM E. HEYS,
Agent for the Applicant.