Improvements in the Treatment of Sewage and Waste Waters.
Year: 1893

page_text: Date of Application, 2nd Sept., 1893
Complete Specification Left, 1st June, 1894-Accepted, 7th July, 1894
PROVISIONAL SPECIFICATION.
Improvements in the Treatment of Sewage and Waste Waters.
I, George JaRMAIN, of 9 York Place, Huddersfield, in the County of York,
Fellow of the Institute of Chemistry and Public Analyst to the Borough of
Huddersfield, do hereby declare the nature of this invention to be as follows:-
My invention relates to Improvements in the Treatment of Sewage and Waste
Waters, and consists chiefly in the production on the spot where the sewage is
undergoing treatment of a precipitant and a filtering medium for sewage and waste
waters.
In carrying my improvements into effect I treat charred sewage sludge, the
result of precipitation by a salt of iron or alumina or the precipitant hereinafter
described, carbonized by any of the known machines or processes or the ashes of
such sewage sludge with acid preferably crude hydrochloric acid in order to
dissolve out the iron or other salt or mineral matter contained in the sludge, and
thereby recover the mineral in solution which after being partially neutralized can
be used again as a precipitant for other sewage.
The animal charcoal obtained by the process of carbonizing and treating the
sludge with acid can be utilized as a filtering medium for sewage and waste
industrial waters.
Dated this 1st day of September 1892
H. B. BARLOW & GILLETT,
Agents for Applicant.
COMPLETE SPECIFICATION.
Improvements in the Treatment of Sewage and Waste Waters.
I, GEORGE JARMAIN, of 9 York Place, Huddersfield, in the County of York,
Fellow of the Institute of Chemistry and Public Analyst to the Borough of
Huddersfield, 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:-
My invention relates to Improvements in the Treatment of Sewage and Waste
Waters, and consists chiefly in the production on the spot where the sewage is
undergoing treatment of a precipitant and a filtering medium for sewage and waste
waters.
In carrying my improvements into effect I treat charred sewage sludge, the
result of precipitation by a salt of iron or alumina or the precipitant hereinafter
described carbonized by any of the known machines or processes or the ashes of
such sewage sludge, with acid, preferably crude hydrochloric acid, in order to
dissolve out the iron or other salt or mineral matter contained in the sludge and
thereby recover the mineral in solution which, after being partially neutralized if
necessary, can be used again as a precipitant for the sewage.
As an example, I place charred sewage sludge or the ashes of such sludge in a
suitable tank or cistern and add thereto about half their weight, or more or less of
crude hydrochloric acid working up the whole into a pasty condition. I prefer to
leave the mixture until the heat generated by the chemical re-action begins to cool,
then, where steam is available, I again heat up the mixture by means of a steam

page_text: pipe blowing the steam direct into the mixture. I then run in boiling water or in
cases where steam is not readily available I employ boiling water alone and
agitate until the mixture is reduced to a thin cream.
as aforesaid the mixture will then be in a fit state to run into the sewage as a
With ordinary char or ashes
precipitant; but if too acid to precipitate properly it may be first partially
neutralized.
The process is equally applicable for waste industrial waters.
The animal charcoal obtained by the process of carbonizing and treating the
sludge char with acid can be utilized as a filtering medium for sewage and waste
industrial waters.
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 :-
Treating charred sewage sludge or the ashes of such sewage sludge with hydro-
chloric acid in order to dissolve out the iron or other salt or mineral matter
contained in the char or ashes and thereby recover said mineral for further use as a
precipitant substantially as specified.
Dated this 31st day of May 1894.
H. B. BARLOW & GILLETT,
17, St. Ann's Square, Manchester, Agents for Applicant.