Improvements in and in the Preparation of Material for use in the Treatment of Sewage and other Polluted Water and Liquids.
Year: 1890

page_text: Date of Application, 24th Oct., 1890-Accepted, 29th Nov., 1890
COMPLETE SPECIICATION
Improvements in and in the Preparation of Material for use in the
Treatment of Sewage and other Polluted Water and Liquids.
I FRANK PULLEN CANDY of 56 Nightingale Lane Balham in the County of Surrey
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 that is to say :-
My said invention relates to an improved material for use in the treatment of
sewage and other polluted water and liquids for the purpose of rendering the same
clear and innocuous. In carrying my invention into effect I take crystallised or
dehydrated sulphate of iron or other sulphate of iron such as persulphate of iron and I
expose such sulphate or sulphates to heat of sufficient intensity to partially decompose
the said sulphate or sulphates so as to form a mixture of oxide, proto-sulphate and per-
When the
sulphate of iron together with a proportion of Nordhausen sulphuric acid.
exposure to heat has lasted long enough to effect the foregoing changes the mixture
is removed and exposed to the atmosphere preferably under the shelter of a shed roof
so as to "weather" the material. Instead however of so exposing it to the atmosphere
I might subject the material to the action of humidified air in a closed chamber or to
the action of steam as I believe that the chief object of the "weathering" operation
is the restoration of moisture to the mass. By the foregoing "weathering" or
humidifying process the mass regains constituents lost in the roasting operation and
is then in a state for use. It may be added to the liquid sewage or impure water in
any suitable form or manner either in a mass or as a powder or as a liquid infusion
from the material and in proportions varying with the degree of pollution or nature
of the impure liquids which it is proposed to purify. The result of its addition
to such impure liquids is that the organic and other impure matter held in suspension
or in solution in the sewage or impure liquid is precipitated in the settling tanks the
resultant effluent water being clear and innocuous.
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 improved material for use in the treatment of sewage and other impure
water and liquids substantially as hereinbefore described.
2. A material for use in the treatment of sewage and other impure water or liquids
consisting of crystallised or dehydrated sulphate of iron or other sulphates of iron
such as persulphate of iron decomposed under the influence of heat and afterwards
subjected to the "weathering" influence of the atmosphere or to treatment with
humidified air or steam so as to produce a similar effect substantially as herein before
described.
Dated this 23rd day of October 1890
DUTTON & FULTON,
1, St. James Square, Manchester, Agents.