A New and Improved Method of Treating Sewage by Means of Ferrio Compounds.
Year: 1893

page_text: Date of Application, 6th May, 1893
Complete Specification Left, 1st Feb., 1894-Accepted, 17th Mar., 1894
PROVISIONAL SPECIFICATION.
A New and Improved Method of Treating Sewage by Means of
Ferrio Compounds.
I ROBERT CAMERON TANNER 61 Parkgate Road Chester Gentleman do
hereby declare the nature of this invention to be as follows:-
I take the ordinary protosulphate of iron (FeSO4, 7 H₂O) commonly called green
copperas, whether prepared specially or obtained as a natural or waste product.
I take also a certain proportion of lime and of the calcium chloro-hypochlorite
(CaOCl2) commonly called chloride of lime. I prefer to add the two latter
substances in the form of a milk similar to milk, of lime to the sewage, and
afterwards to add the protosulphate of iron as a solution, but I do not bind myself
to do so in all cases. The result of this proceeding is that hydrated peroxide of
iron (ferric bydrate FеHO3) is produced in the presence of the sewage and
precipitates the whole or greater part of the soluble organic impurity contained
therein according to the nature of the sewage.
The proportions of the chemicals named in this Specification will vary according
to the kind of sewage to be treated.
COMPLETE
SPECIFICATION.
A New and Improved Method of Treating Sewage by Means of
Ferric Compounds.
I, ROBERT CAMERON TANNER of 61, Parkgate Road Chester in the County of
Chester, Gentleman, 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 :-
This invention relates to a new and improved method of treating sewage by
means of ferric compounds.
In proceeding according to my invention I take ordinary protosulphate of iron
whether prepared specially or obtained as a natural or waste product.
I also take a certain proportion of lime and calcium hypochlorite the two latter
in the form of milk and the former as a solution, but I do not bind myself to do so
in all cases.
The result of this proceeding is that the ferric hydrate produced in the presence
of the sewage precipitates the whole or the greater part of the soluble organic
impurity contained in the sewage.
In dealing with the sewage of water closeted towns where there is not a large
quantity of manufacturer's waste waters turned into the sewers, I find that 5 to
8 cwts. of lime, 15 to 20 cwts. of protosulphate of iron to 1 cwt. of calcium
hyprochlorite per million gallons will give very satisfactory results.
In large manufacturing towns I prefer to let the sewage rest for a time in tanks
holding several hours' supply so as to get an average sewage to treat, should this
average sewage resemble that of a water closeted town with an inconsiderable
quantity of manufacturer's waste liquor it is to be treated as above described, but
in the event of its being already. alkaline, I should prefer to omit the lime from
the above mixture and treat the sewage with the protosulphate of iron and calcium
hyprochlorite alone.

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.
Firstly. The treatment of sewage with nascent ferric oxide formed in the
presence of the sewage itself by the action of lime and calcium hyprochlorite upon
ferrous sulphate.
Secondly. The preparation of nascent ferric oxide for use as a precipitant of the
soluble organic impurity in sewage by mixing ferrous sulphate with lime and
calcium hyprochlorite in the presence of the sewage itself.
تيدم
T
1004
R. C. TANNER.