Activated-Sludge Treatment. Page: 2 of 2
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REST AVAILABLE COP'
1,254,833.ad the m oisfure content of the sludge re-
uced to such;an extent that'it can be readily
removed as /a rubbery mass, drained and
diTed.
The. treatrfent of the sludge by the acid as
above described, also fixes any 'volatile or
easily decomposed nitrogen compounds -that.
are otherwise certain to be driven off dur-
ing the drying process. This action of the
rio acid in fixing the ammonia content of the
sludge is important, as in its original condi-
titon much of the ammonia is volatile, and
if the sludge be dried without applying the
acid treatment this volatile ammohria islikely
15 to be lost, thus depriving-the fer-tilizer of its -
most valuable constiiPnt. '
It will thus be-een' that I-have, by the
present process, achieved a decided advance
in the activated sludge"method \of sewage
20 disposal, in that the sludge-is made readily
available as a fertilizer,.-the - return from
which is more thansuficient to cover the,
entire cost of the sewage treatment, whereas
heretofore the sludge has not been ecnomi-
25 ally available forthis purpose by reason of
the expense and 'difficulty of de-hydrating
the same.
I claim:.
1. The method of 'de-hydrating activated
SO sludge which consists in heating the same
above thirty degrees Centig-ade, then sub-
jecting the same to the action of an acid.
whereby coagulation takes place, and then
separating the coagulated sludge from the
35 liquid.
2. The method of de-hydrating activated
sludge which consists in subjecting the same
to the sinmultaneous action of an acid and to
agitation by means of a gas introduced there-
0 to whereby coagulatiton takes place, thenseparating the coagulated sludge from the
liquid, and drying.
3. The method of de-hydrating activated
sludge which consists in subjecting the same
to the simultaneous action of an acid and 45
to agitation by means of air whereby co-
agulation takes place, then separating the
coagulated sludge from the liquid, and dry-
ing.
4. The method of de-hydrating activated .50
sludge which consists in subjecting the same
to' the action of sulfuric acid whereby co
agulation takes 'place accompanied by the
generation of gases and the coagulated
sludge is caused to float, and then separat- 53
ing the coagulated floating sludge from the
liquid.
5. The method of de-hydrating activated
sludge which consists in heating the dame
above 30 C., then subjecting the same to 00
the action of- sulfuric acid whereby co-
agulation takes place accompanied 'by the
generation ofgs therein and the coagulated
sludge is caused to float, and then separating
the-coagulated floating sludge from the liq- 65
'hid, and drying.
6. The method of de-hydrating activated
sludge whidh consists in heating the same /
above 300 C., then subjecting the same to7.
the action of sulfuric acid and agitation by ;70
means of air whereby coagulation takes place
accompanied by the generation of gas there
in and the coagulated sludge: is caused to
float, and then separating the coagulated
floating sludge from the liquid, and drying. 7
WILLIAM C. MOOR.
- Witnesses:
A. B. STRATTON,
E. G. McDoNATJ).%t r,;ay
;
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Moor, William C. Activated-Sludge Treatment., patent, January 29, 1918; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1258140/m1/2/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.