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1. WO1996041245 - ON-LINE CONTINUOUS MONITOR TO OPTIMIZE COAGULANT AND FLOCCULENT FEED IN WASTEWATER AND PAINT SPRAY BOOTH SYSTEMS

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[ EN ]

CLAIMS
WHAT IS CLAIMED IS:
1. A method to optimize the amount of a treatment-additive released into a contaminated fluid flowing in a wastefluid treatment system comprising:
a. admixing said treatment-additive into said contaminated fluid to form additive-treated fluid;
b. monitoring said additive-treated fluid prior to filtering to sense a property of said additive- treated fluid relevant to the decontamination of said contaminated fluid by said treatment-additive;
c. generating a first signal proportional to the magnitude of said sensed property of said additive- treated fluid;
d. removing contaminate solids from said additive-treated fluid by solids-separator means to form additive-treated, solid-separated fluid;
e. monitoring said additive-treated, solid- separated fluid to sense said property of such fluid relevant to the decontamination of said contaminated fluid by said treatment-additive;
f. generating a second signal proportional to the magnitude of said sensed property of said additive- treated, solids-separated fluid;
g. adjusting the amount of treatment-additive added to the wastefluid treatment system by comparing a plurality of said first signal magnitude to that of said second signal magnitudes.
2. The method of claim 1 wherein said property is tur- bidity.
3. The method of claim 1 wherein said property is particle size.

4. The method of claim 1 wherein said property is streaming current.
5. The method of claim 1 wherein said property is ultraviolet absorption.
6. The method of claim 1 wherein said property is infrared absorption.
7. The method of claim 1 wherein said property is a specific ion.
8. The method of claim 1 wherein said adjustment com-prises:
a. determining the range of concentrations of said treatment-additive which reduces the said sensed property of said treatment-additive fluid to a minimum; b. determining the range of concentrations of said treatment-additive which reduces said sensed property of said solids-separated, treatment-additive fluid to a minimum;
c . determining the overlapping concentration range with respect to said minimum range concentrations of said treatment-additive fluid and said solids-separated, treatment-additive fluid.
d. adjusting the concentration of said treatment-additive such that the concentration of said treatment-additive in said wastefluid treatment system is within said overlapping concentration range.
. The method of claim 1 wherein the treatment-additive is a detackifier.
10. The method of claim 1 wherein the treatment-additive is a coagulant.
11. The method of claim 1 wherein the treatment-additive is a flocculent.
12. The method of claim 1 wherein the treatment-additive is a demulsifier.

13. The method of claim 1 wherein said contaminated fluid contains paint.
14. The method of claim 1 wherein said contaminated fluid is waste water.
15. The method of claim 1 wherein said solids-separator means is a filter.
16. The method of claim 1 wherein said solids-separator means is a clarifier.
17. The method of claim 1 wherein said solids-separator means is a dissolved air floatation unit.
18. An apparatus for optimizing the amount of treatment additive added to the contaminated main fluid flowing in a wastefluid treatment system having a plurality of main fluid treatment-additive feed pumps, comprising:
a. a pilot line monitoring system coupled to said wastefluid treatment sytem;
b. a pilot line treatment-additive source and addition means coupled to said pilot line monitoring sytem;
c. a processor means coupled to said pilot line addition means for varying the concentration of treatment-additive added to wastefluid flowing into said pilot line monitoring system and storing the
concentration of treatment-additive added to the pilot line wastefluid in its memory, said processor having at least a first input and a second input and an output, said output being coupled to said main fluid treatment- additive feed pumps coupled to said wastefluid treatment system;
e. a solids-separator means coupled to said pilot line monitoring system;
f . a first means positioned at a first location in said pilot line monitoring system for sensing at said first location a sensed property of said contaminated fluid after treatment with a
concentration of pilot line treatment-additive and producing a first electrical signal varying with a func-tion of said sensed property;
g. a second means positioned at a second location in said pilot line system downstream from said first location for sensing said sensed property of said contaminated fluid after treatment with said treatment-additive and after separating solid contaminants by said solids-separator means and producing a second electrical signal varying with a function of said sensed property; h. means coupling said first and second inputs of said processor means to said first and second sensing means, said processor means capable of determining the optimal concentration of treatment-additive which should be in said waste treatment system main fluid from a plurality of said first and second signal readings, and further capable of adjusting the flow rate of said main fluid treatment-additive feed pumps such that an optimal concentration of treatment-additive is added to said waste treatment system.
19. The apparatus of claim 18 wherein said sensed property is turbidity.
20. The apparatus of claim 18 wherein said first and second sensing means are located outside within the main flow of said wastefluid treatment system.
21. The apparatus of claim 18 wherein said pilot line wastefluid flow is adjusted to keep the flow to said sensing means constant.
22. The apparatus of claim 21 wherein said constant flow is between 0.1-1.5 GPM.

41245 PCΪ7US96/06862
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23. The apparatus of claim 21 wherein said constant flow is approximately about 0.5 GPM.
24. The apparatus of claim 18 wherein said pilot line wastefluid flow from said main fluid of said wastefluid treatment system is adjusted to ensure constant shear rate throughout said wastefluid treatment system.