A Process for the Purification of Waste Liquors from Distilleries.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
A Process for the Purification of Waste Liquors from Distilleries.
JOHN CHRISTOPHER STEAD, Cordova Road, Bow, London, E., Chemist, do hereby
declare-the nature of this invention to be as follows:-
-
The process consists essentially of the following cycle of operations:-
(1) The treatment of the liquors, with or without the admixture of sewage,
at a suitable temperature with metal iron or some suitable salt of iron.
(2) Eration and settling of the liquor.
(3) Completion of the peroxidation of the iron contained in the liquor by
suitable chemicals.
(4) Neutralisation, precipitation, and settling of the liquor.
(5) The bacteriological treatment of the resulting clear liquor from (4) by
itself or mixed with suitable proportions of sewage.
I, JOHN CHRISTOPHER STEAD, 42, Grove Green Road, Leytonstone, Chemist,
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 process has for its object the purification of waste liquors (spent wash, etc.)
from distilleries so that they shall not undergo or induce fermentation or putre-
faction or favour the formation of fungoid growth and that they shall not pollute
streams into which they may be discharged.
Plans showing a suitable arrangement of plant are attached.
The process (with or without plant arranged as shown) consists essentially of
the following cycle of operations:-
-
The separate collection of sewage and non-acid liquors: the sewage and non-
acid liquids from the distillery are collected in a tank or cesspool (1) fitted with
baffle plates so as to cause a consecutive flow or displacement.
The separate collection of acid liquors: the acid liquors (spent wash, etc.) are
collected in a tank (2) capable of holding one week's product filled with scrap iron,
iron ore or suitable iron salt and fitted with baffle plates so as to cause a con-
secutive flow or displacement.
•
The liquids overflow from these tanks (1 and 2) into the opposite ends of the
mixing tank (3) which must have a capacity equal to the maximum daily discharge

page_text: of waste liquors and sewage from the distillery. From the middle of the mixing
tank (3) the mixed liquid is discharged on to the top of the chamber packed with
scrap iron (4) through which it trickles and drains into the settling tank (5) from
which it overflows into tank (6). Here the remaining oxidisable matter con-
tained in the liquid is oxidised by the addition of suitable chemicals and the
liquid is then neutralised or rendered slightly alkaline and settled in tank (7).
Finally the clear liquor from the tank (7) is run on to filters (8) composed of
broken coke or brick, ballast, ashes or other suitable material. Of these filters
two or more are employed so that while one is filling the other or others are
emptying and standing empty.
Baffle plates are placed, as shown in plans, in all the tanks except the mixing
tank (3) so as to cause a consecutive flow or displacement.
The separation of sludge the collecting tank for acid liquors (2), the mixing
tank (3) the settling tank (5) and the tanks (5) and (7) have bottoms set at an
-angle of from 15° to 20° and are connected at their lowest points by pipes having
a suitable fall with sludge wells (9) so that the deposits from the liquors are
withdrawn continuously from the tanks by gravitation.
On the attached drawings the following details are shown:
Fig. 1 section of plant arrangement.
Fig.
plan of plant arrangement.
Fig. 3 elevation of tanks 3, 5, 6 and 7; the tank 3 to be without baffle plates A.
Fig. 4 elevation of acid liquor tank (2).
The numbers and letters refer as follow:
1 non-acid liquor tank, 2 acid liquor tank, 3 mixing tank, 4 aerator, 5 settling
tank, 6 oxidising tank, 7 neutralising tank, 8 filters, 9 sludge wells.
A baffle plates, B perforated baffle plate, C outlet at base of acrator, D sludge
pipes, E course of liquor.
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) The separate collection of sewage & non-acid liquors.
(2) The separate collection & treatment of acid liquors.
(3) The aeration of the liquids by means of the chamber packed with scrap iron
as described:
(4) The continuous separation and collection in wells of sludge deposited from
the liquors in the manner-described.
(5) The cycle of operations as described for purifying the waste liquors (spent
wash, etc.) from distilleries.
Dated this 94th day of Catalan 1900