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1. (WO1980000832) TRAITEMENT D"EAUX D"EGOUTS POUR LEUR DECHARGE EN MER
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique
What is claimed is:
1. A method of treating sewage fluid for discharge through an outfall to a body of sea water which comprises:
removing dense suspended particulate materials from said fluid;
passing said fluid through a fine mesh screen, which is between 20 and 60 mesh;
introducing a coagulant composition to said fluid, said coagulant composition comprising a member selected from the group consisting of an alum composition, a poly-electrolyte, or mixtures thereof to promote coagulation of colloidal size particles in said fluid;
filtering said fluid containing said coagulated particles through a deep bed multi-media filter to produce a filtrate essentially free of particles between about 1 micron and about 70 microns;
detecting the presence of a lower quantity of oxygen in said filtrate than in the sea water into which said filtrate is to be discharged by comparing the quantity of dissolved oxygen in said filtrate with the quantity of dissolved oxygen in the sea water;
raising the quantity of dissolved oxygen in said filtrate to at least the level present in said sea water in response to the detection of said lower quantity of oxygen by blowing an atomized oxygen containing gas under pressure into said filtrate; and
discharging said oxygen treated filtrate to the sea water through said outfall.

2. The method of claim 1 wherein said removing step comprises conducting said fluid through a roughing screen or bar rack.

3. The method of claim 1 wherein said removing step comprises passing said sewage fluid through a grit collection chamber.

OMPI

4. The method of claim 1 wherein said fine mesh screen is between 2 and 60 mesh.

5. The method of claim 4 wherein said coagulant composition comprises a member selected from the group consisting of an alum composition, pol electrolyte, or mixtures thereof.

.6. The method of claim 1 wherein said coagulant is the alum composition, and said alum composition has the genera formula M2' SO^M^" - (S04)3 . 24 H20 wherein M1
is monovalent and is selected from the group consisting of sod ium, potassium, rubidium, cesium, ammonium, tellurium and silver, and M111 is trivalent and is selected from the group consisting of iron, chromium, aluminum, manganese, indium, tellurium, gallium, vanadium, cobalt, titanium and rhodium.

7. The method of claim 6 wherein M1 is selected from the group consisting of hydroxylamine or the radical of an organic quaternary base.

8. The method of claim 6 wherein said coagulant composition is a polyelectrolyte and, said polyelectrolyte is a synthetic organic polymer containing repeating units of acrylic acid.

9. The method of claim 8 wherein said deep bed filter comprises a concrete casing formed with a first
upstanding wall and coordinate walls bounding a deep
industrial filter chamber and carrying at its upper side area a second upstanding wall and coordinate walls bounding a fluid-receiving chamber, said first upstanding wall having at its lower area and exterior thereof coordinate walls bounding a chamber for receiving clarified fluid, horizontally positioned distributor troughs in the filter chamber across its upper area above the filter bed and receiving fluid directly through openings in a wall of the fluid-receiving chamber first named, a floor wall in the filter chamber, means for supporting said floor wall substantially above the
fK base of the filter chamber, a plurality of distributor blocks on the flooring and adapted to support a filter bed, said distributor blocks being formed with through-slots therein for the passage of fluid, a plurality of open-ended nozzles passing through the floor wall to a distance below the same and having flow communication with the slots in the distributor blocks, a valved backwash discharge pipe extending from said fluid receiving chamber, a valved back-wash inflow pipe and also a valved outflow pipe extending from the filter chamber below its floor wall, and means for admitting jets of air to the area of the filter chamber below said floor wall thereof for agitating the filter bed during back wash thereof.

10. The method of claim 9 which comprises adjusting the amount of dissolved oxygen in said filtrate to a predetermined level by blowing an atomized oxygen-containing gas under pressure into said filtrate.

11. The method of claim 10 wherein said gas is selected from the group consiting of air, oxygen, and ozone.

12. The method of claim 11 which comprises cis-charging said filtrate to the sea through an outfall pipe having diffuser ports located a predetermined distance away from the shoreline.

13. The method of claim 12 which comprises disinfecting said filtrate with chlorine before discharging said filtrate to the sea.

14. The method of claim 13 which comprises introducing from about 0.1 to about 1.0 milligrams per liter of sewage of said polyelectrolyte into said sewage fluid.

15. The method of claim 1, 5 or 10 which comprises introducing from about 5 to about 15 milligrams per liter of sewage of said alum into said sewage fluid.

16. The method of claim 1 which includes raising the level of dissolved oxygen in said filtrate to a level higher than the level of dissolved oxygen in the surrounding seawater.

17. Apparatus for treating sewage fluid for discharge to the sea which comprises:
means for removing heavy debris from said sewage fluid;
means for removing dense suspended particulate materials from said sewage fluid, said means for removing particύlate materials being in fluid interconnecting relation ship with said means for removing heavy debris;
a fine mesh screen receiving the fluid output of said means for removing dense suspended particulate
materials;
means for introducing a coagulant composition to said fluid to promote coagulation of colloidal size
particles in said fluid;
a deep bed multi-media filter in fluid
communication with said means for introducing a coagulant composition, said filter yielding a filtrate essentially free of particles between about 1 micron and about 70 microns;
means for comparing the level of dissolved oxygen in said filtrate with the level of dissolved oxygen in the surrounding seawater; and
means for raising the quantity of dissolved oxygen in said filtrate to a predetermined level in response to a signal from said comparing means by blowing an atomized oxygen containing gas under pressure into said filtrate.

(received by the International Bureau on 4 December 1979 (04.12.79))
1. A method of treating sewage fluid for discharge through an outfall to a body of sea water which comprises:
removing dense suspended particulate materials from said fluid;
passing said fluid through a fine mesh screen, which is between 20 and 60 mesh;
introducing a coagulant composition to said fluid, said coagulant composition comprising a member selected from the group consisting of an alum composition, a polyelectrolyte, or mixtures thereof to promote coagulation of colloidal size particles in said fluid;
filtering said fluid containing said coagulated particles through a deep bed multi-media filter to produce a filtrate essentially free of particles between about 1 micron and about 70 microns;
detecting the presence of a lower quantity of oxygen in said filtrate than in the sea water into which said filtrate is to be discharged by comparing the quantity of dissolved oxygen in said filtrate with the quantity of dissolved oxygen in the sea water;
raising the quantity of dissolved oxygen in said filtrate to at least the level present in said sea water in response to the detection of said lower quantity of oxygen by blowing an atomized oxygen containing gas under pressure into said filtrate; and
discharging said oxygen treated filtrate to the sea water through said outfall.

2. The method of claim 1 wherein said removing step comprises conducting said fluid through a roughing screen or bar rack.

3. The method of claim 1 wherein said removing step comprises passing said sewage fluid through a grit collection chamber.

_OMPI_
WIPO

4. The method of claim 1 wherein said fine mesh screen is between 2 and 60 mesh.

5. The method of claim 4 wherein said coagulant composition comprises a member selected from the group consisting of an alum composition, polyelectrolyte, or mixtures thereof.

.6. The method of claim 1 wherein said coagulant is the alum composition, and said alum composition has the genera formula M2' S04.M '" - (S04)3 . 24 H20 wherein M'
is monoValent and is selected from the group consisting of sod ium, potassium, rubidium, cesium, ammonium, tellurium and silver, and M11' is trivalent and is selected from the group consisting of iron, chromium, aluminum, manganese, indium, tellurium, gallium, vanadium, cobalt, titanium and rhodium.

7. The method of claim 6 wherein M' is selected from the group consisting of hydroxylamine or the radical of an organic quaternary base.

8. The method of claim 6 wherein said coagulant composition is a polyelectrolyte and, said polyelectrolyte is a synthetic organic polymer containing repeating units of acrylic acid.

9. The method of claim 8 wherein said deep bed filter comprises a concrete casing formed with a first
upstanding wall and coordinate walls bounding a deep
industrial filter chamber and carrying at its upper side area a second upstanding wall and coordinate walls bounding a fluid-receiving chamber, said first upstanding wall having at its lower area and exterior thereof coordinate walls bounding a chamber for receiving clarified fluid, horizontally positioned distributor troughs in the filter chamber across its upper area above the filter bed and receiving fluid directly through openings in a wall of the fluid-receiving chamber first named, a floor wall in the filter chamber, means for supporting said floor wall substantially above the base of the filter chamber, a plurality of distributor blocks on the flooring and adapted to support a filter bed, said
distributor blocks being formed with through-slots therein for the passage of fluid, a plurality of open-ended nozzles passing through the floor wall to a distance below the same and having flow communication with the slots in the distributor blocks, a valved backwash discharge pipe extending from said fluid receiving chamber, a valved back-wash inflow pipe and also a valved outflow pipe extending from the filter chamber below its floor wall, and means for admitting jets of air to the area of the filter chamber below said floor wall thereof for agitating the filter bed during back wash thereof.

10. The method of claim 9 which comprises adjusting the amount of dissolved oxygen in said filtrate to a predetermined level by blowing an atomized oxygen-containing gas under pressure into said filtrate.

11. The method of claim 10 wherein said gas is selected from the group consiting of air, oxygen, and ozone.

12. The method of claim 11 which comprises cis-charging said filtrate to the sea through an outfall pipe
having diffuser ports located a predetermined distance away from the shoreline.

13. The method of claim 12 which comprises disinfecting said filtrate with chlorine before discharging said filtrate to the sea.

14. The method of claim 13 which comprises introducing from about 0.1 to about 1.0 milligrams per liter of sewage of said polyelectrolyte into said sewage fluid.

15. The method of claim 1, 5 or 10 which comprises introducing from about 5 to about 15 milligrams per liter of sewage of said alum into said sewage fluid.

MPI

16. The method of claim 1 which includes raising the level of dissolved oxygen in said filtrate to a level higher than the level of dissolved oxygen in the surrounding seawater.
17. Apparatus for treating sewage fluid for discharge to the .sea which comprises:
means for removing heavy debris from said sewage fluid;
means for removing dense suspended particulate materials from said sewage fluid, said means for removing particulate materials being in fluid interconnecting relationship with said means for removing heavy debris;
a fine mesh screen receiving the fluid output of said means for removing dense suspended particulate materials;
means for introducing a coagulant composition to said fluid to promote coagulation of colloidal size particles in said fluid;
a deep bed multi-media filter in fluid communication with said means for introducing a coagulant composition, said filter yielding a filtrate essentially free of particles between about 1 micron and about 70 microns;
means for detecting the presence of a lower quantity of oxygen in said filtrate than in the surrounding seawater into which said filtrate is to be discharged by comparing the quantity of dissolved oxygen in said filtrate with the quantity of dissolved oxygen in the surrounding seawater;
means for raising the quantity of dissolved oxygen in said filtrate to at least the level present in said seawater in response to a signal indicating a lower level of oxygen in said filtrate than in said seawater from said means for detecting by blowing an atomized oxygen containing gas under pressure into said filtration; and
means for discharging said oxygen treated filtrate