Improvements in Apparatus for Bacteriological Treatment of Sewage.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Bacteriological Treatment of Sewage.
I, WALTER CHARLES CROSS PAKES, 14, Trinity Square, London, S.E., L.R.C.P.,
M.R.C.S., etc., do hereby declare the nature of this invention to be as follows;-
My invention relates to improvements in sewage works, in which anaerobic
and aerobic chambers, beds, or tanks are used. The sewage is passed through a
series of chambers, beds, or tanks, alternately anaerobic and aerobic. The
treatment of the sewage by the anaerobic bacteria is not completed in the first
chamber, but is resumed in the 3rd, 5th, chambers, after passing through
the 2nd, 4th, chambers respectively in which the aerobic action goes on.
The aerobic chambers may be in pairs, or larger groups, so that while the
sewage is passing through one chamber of a group, the others may be resting.
Each aerobic chamber will be provided with a valve, for the purpose of controlling
the admission of sewage. The valves may be opened and closed by hand or auto-
matically; in the latter case they may be controlled by suitable timing mechanisms.
Dated this 8th day of June 1899.
ARCHD. SHARP, A.M.I.C.E.,
Consulting Engineer, 47, Victoria Street, London, S.W.,
Agent for the Applicant.
improvements in Apparatus for Bacteriological Treatment of Sewage.
I, WALTER CHARLES CROSS PAKES, 14, Trinity Square, London, S.E., L.R.C.P.,
M.R.C.S., etc., do hereby declare the nature of this invention to be as follows:-
The
My invention relates to improvements in sewage works, in which anaerobic
and aerobic chambers, beds, or tanks are used. The sewage is passed through a
series of chambers, beds, or tanks, alternately anaerobic and aerobic.
treatment of the sewage by the anaerobic bacteria is not completed in the first
chamber, but is resumed in the 3rd, 5th, chambers, after passing through
the 2nd, 4th, chambers respectively in which the aerobic action goes on.
The aerobic chambers may be in pairs, or larger groups, so that while the
sewage is passing through one chamber of a group, the others may be resting.
Each aerobic chamber will be provided with a valve, for the purpose of controlling
the admission of sewage. The valves may be opened and closed by hand or auto-
matically; in the latter case they may be controlled by suitable timing mechanisms.
Or, instead of. a pair of aerobic chambers, one chamber sub-divided into com-
Price Q

page_text: partments may be used; each compartment having a valve to control the admission
of sewage.
A purer effluent will be obtained by this system than by the usual method
of completing the anaerobic treatment of the sewage before it passes to the aerobic
chamber. Further, in certain cases the time required for satisfactory treatment
of sewage, will be reduced by the use of my invention. To complete a bacterial
action on any material, the last stages are often slower than the earlier stages.
Thus, for example, if with a certain specimen of sewage, it requires two hours'
anaerobic treatment to get within 20 per cent. of completion and six hours to get
within 5 per cent. of completion, and if the same relative values apply to the
aerobic treatment, it would require twelve hours under the usual bacterial treat-
ment of sewage to give an effluent within 5 per cent. of completion of the bacterial
action. With my invention, the same relative values applying, two hours' treat-
ment in the 1st (anaerobic) chamber and two hours' treatment in the 2nd
(aerobic) chamber would give an effluent within 20 per cent. of completion of the
bacterial action; this effluent receiving two hours' treatment in the 3rd (anaerobic)
chamber and two hours' treatment in the 4th (aerobic) chamber, the resulting
effluent would be within 20 per cent. of 20 per cent., i.e., 4 per cent., of completion
of the bacterial action.
The anaerobic and aerobic chambers hereinbefore mentioned may be in any
of the known forms, septic tanks, filter beds, chambers containing trays; but I
do not claim any special type of chamber.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
(1) In a system of bacterial treatment of sewage, the combination of two or
more sets of anaerobic and aerobic chambers in alternation, the sewage being sub-
jected to the action of anaerobic and aerobic bacteria alternately.
(2) In an arrangement of two or more sets of anaerobic and aerobic chambers
in alternation the dividing of the aerobic chambers into compartments, each with
a valve to control the admission of sewage, so that one compartment may be resting
while the sewage passes through the others.
Dated this Twenty-sixth day of February 1900
ARCHD. SHARP, A.M.I.C.E.,
47, Victoria Street, Westminster, London, S.W.,
Agent for the Applicant.