Base de données sur les brevets canadiens

Page des revendications

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Numéro de document de brevet: 2761148

(54) Titre anglais: LIVESTOCK WASTEWATER TREATMENT SYSTEM AND METHOD

(54) Titre français: SYSTEME ET PROCEDE DE TRAITEMENT DES EAUX USEES D'ELEVAGE

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Revendications:

Nota : Les revendications sont présentées dans la langue officielle dans laquelle elles ont été soumises.




CLAIMS

What is claimed is:


1. A livestock wastewater treatment system, comprising:

a sludge dewatering device including a wastewater inlet, a fluid discharge
and a solids discharge;

a chemical conditioner including an fluid inlet and a fluid discharge;

a suspended solids separator including a fluid inlet, a fluid discharge, and
a solids discharge;

a fine solids filter device including an fluid inlet and fluid discharge;

a membrane filter unit including a fluid inlet, a reclaimed water discharge
and a concentrated liquid discharge;

said fluid inlet of said chemical conditioner fluidically connected to said
liquid discharge of said sludge dewatering device;

said fluid inlet of said suspended solids separator fluidically connected to
said fluid discharge of said chemical conditioner;

said fluid inlet of said fine solids filter device fluidically connected to
said
liquid discharged of said suspended solids separator; and

said fluid inlet of said membrane filter unit fluidically connected to said
fluid discharge of said fine solids filter device.



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2. The livestock wastewater treatment system of claim 1, wherein said sludge
dewatering device is a screw press.


3. The livestock wastewater treatment system of claim 1, wherein said
suspended
solids separator is a plate clarifier.


4. The livestock wastewater treatment system of claim 3, wherein said plate
clarifier
is a lamella plate clarifier.


5. The livestock wastewater treatment system of claim 1, wherein said membrane

filter unit includes:

a water polishing unit having said polished water discharge; and

a liquid concentrating unit having said concentrated liquid discharge.

6. The livestock wastewater treatment system of claim 1, wherein said chemical

conditioner includes:

a first chemical injector unit;
a first mixer;

a second chemical injector unit;
a second mixer;



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said first chemical injector unit, said first mixer, said second chemical
injector unit, and second mixer being fluidically connected in series between
said inlet
and said discharge of said chemical conditioner.


7. The livestock wastewater treatment system of claim 1, wherein said fine
solids
filter device includes:

a mutli-media filter unit;
a first bag filter unit;

a second bag filter unit;

said first bag filter unit and said second bag filter unit being fluidically
connected in parallel;

said multi-media filter being connect upstream to said first and second bag
filter units.


8. A livestock wastewater treatment system, comprising:

a sludge dewatering device configured to separate a solids-fluid
wastewater mixture into separate solid and fluid flows;

a chemical conditioner configured to aggregate suspended solids in said
fluid flow into floc;

a suspended solids separator configured to remove said floc from said
fluid flow;



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a fine solids filter device configured to remove fine solids from said fluid
flow;

a membrane filter unit configured to separate said fluid flow into a
permeate fluid flow and an effluent fluid flow, and to concentrate said
effluent fluid flow
into a fluid concentrate; and

wherein said fine solids filter device is downstream from said suspended
solids separator, and said membrane filter is downstream from said fine filter
device.


9. The livestock wastewater treatment system of claim 8, wherein said sludge
dewatering device is a screw press.


10. The livestock wastewater treatment system of claim 8, wherein said
suspended
solids separator is a lamellar plate clarifier.


11. The livestock wastewater treatment system of claim 8, wherein said
chemical
conditioner includes:

a first chemical injector unit;
a first mixer;

a second chemical injector unit;
a second mixer;



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said first chemical injector unit, said first mixer, said second chemical
injector unit, and second mixer being fluidically connected in series between
said inlet
and said discharge of said chemical conditioner.


12. The livestock wastewater treatment system of claim 8, wherein said fine
solids
filter device includes:

a mutli-media filter unit;
a first bag filter unit;

a second bag filter unit;

said first bag filter unit and said second bag filter unit being fluidically
connected in parallel;

said multi-media filter being upstream to said first and second bag filter
units.


13. A livestock wastewater treatment method, comprising the steps of:

separating a solids-fluid wastewater mixture in a sludge dewatering device
into a solids effluent and a first fluid effluent;

adding flocculants to said first fluid effluent causing suspended solids in
said first fluid effluent to aggregate into floc to form a second fluid
effluent;

separating said floc from said second fluid effluent in a suspended solids
separator to form a third fluid effluent;



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passing said third effluent through a fine solids filter device to form a
forth
fluid effluent;

passing said forth fluid effluent through a membrane filter unit to form
permeate fluid and a fluid concentrate.


14. The livestock wastewater treatment method of claim 13, wherein said
permeate
fluid is reclaimed water, and said concentrate fluid is liquid fertilizer.


15. The livestock waste water treatment method of claim 13, wherein said
sludge
dewatering device is a screw press.


16. The livestock wastewater treatment method of claim 13, wherein said
suspended
solids separator is a lamellar plate clarifier.


17. A livestock wastewater treatment method, comprising the steps of:

separating a solids-fluid wastewater mixture in a sludge dewatering device
into a solids effluent and a first fluid effluent;

adding flocculants to said first fluid effluent causing suspended solids in
said first fluid effluent to aggregate into floc to form a second fluid
effluent;

separating said floc from said second fluid effluent in a suspended solids
separator to form a third fluid effluent;



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passing said third effluent through a fine solids filter device to form a
forth
fluid effluent;

passing said forth fluid effluent through a first membrane filter set of a
membrane filter unit to form a first permeate fluid and a first concentrate
fluid;
adding an acid to said first permeate fluid forming a second permeate
fluid;

passing said second permeate fluid through a second membrane filter set
of said membrane filter unit to form a third permeate fluid and a second
concentrate fluid;
passing said first concentrate fluid through a third membrane filter set of

said membrane filter unit to form a fourth permeate fluid and a third
concentrate fluid;
passing said third concentrate fluid through a fourth membrane filter set of
said membrane filter unit to form a fifth permeate fluid and a fourth
concentrate fluid;
and

wherein said third permeate fluid is reclaimed water and said fourth
concentrate fluid is liquid fertilizer.


18. The livestock wastewater treatment method of claim 17, further comprising
the
step of:

admixing said fourth permeate fluid and said first permeate fluid.



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19. The livestock wastewater treatment method of claim 17, further comprising
the
step of:

admixing said second concentrate fluid and said second permeate fluid.

20. The livestock wastewater treatment method of claim 17, further comprising
the
step of:

admixing said fifth permeate fluid with said first fluid effluent.


21. The livestock wastewater treatment method of claim 17, further comprising
the
step of:

adding an acid to said third concentrate fluid.



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