Strategies-For-Removing-Solids-And-Oil-From-Water-Part-2-Chemtreat

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Cooling

Back Wash

Sand Filter

Rolling Mill

Fil Aid Filter Aid

Sand Filter

Scale Pit

12,000 GPM

Rope Skimmer

Scale Roll Off Dewatering Aid

Filtrate ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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After Dewatering Aid

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Filtered Water Clean Up Filtered Water Clean Up ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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Common Challenges ‐ System Design • • • • • • •

Deep Scale Pit or Pump Wells Variable Water Level in Scale Pit Poor Access to Feed Points Poor Ability to Remove Floating Oil Poor Ability to Remove Floating Oil Short Residence Time No Filtration Poor Mixing Energy ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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Cooling

Blow Down

Caster

Flush Water

Emulsion Breaker Oil

Flocculant

Settling Pond Settling Pond

Scale ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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• Turbidity before new treatment ranged from y f g f 30 to 60 NTU’s.

ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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• After new program turbidity runs from 4 to 10 NTU’s with lower chemical usage.

ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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Caster Oil

Settling Basin

Emulsion Breaker

Cooling

Flocculant

ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

Scale Pit and Sump

Scale

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Watch for Adverse Chemical Interactions • Defoamer – Over use of anti‐foaming agents can reduce flotation of oil and grease flotation of oil and grease

• Antiscalant ‐ Dispersant – Excess feed of anionic dispersing agents can make Excess feed of anionic dispersing agents can make coagulation of solids more difficult

ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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Settling Rate vs Particle Size Particle Size mm Dia.

Order of Size

Time to Settle 1 Foot

1.0

Coarse Sand

3 Sec.

0.1

Fine Sand

38 Sec.

0.01

Silt

33 Min.

0.001

Bacteria

55 Hours

0.0001

Colloidal

y 230 Days

0.00001

Colloidal

6.3 Years

Based on Silica Sand; specific gravity 2.65 ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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Stoke'ss Law Stoke

V =

G (P1 ‐

2 P2 ) D

18 u 18 u

V = Time to Settle G = Gravity P1 = Particle Density P1 = Particle Density

P2 = Liquid Density D = Diameter of Particle u = Viscosity of Liquid Vi it f Li id

ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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Characteristics of Water Temp. oC

Density

Viscosity

0 4 8 12 16 20 24 28

0.99987 0 99987 1.00000 0.99988 0.99953 0.99897 0 99823 0.99823 0.99733 0.99626

1.79 1 79 1.57 1.39 1.24 1.12 1 01 1.01 0.92 0.84

ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

Temp. oF 32 0 32.0 39.2 46.4 53.6 60.8 68 0 68.0 75.2 82.4 38


How Do Polymers Work? l k? 

Charge Neutralization

Coagulation

Flocculation

Particle Bridging ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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Anionically Dispersed Suspended Particles ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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Primary Coagulant Primary Coagulant ‐ Emulsion Breaker 

Very High Cationic Charge Very High Cationic Charge

Low Molecular Weight

Neutralizes Particle Charge

Used Alone or with Flocculant ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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The addition of cationic charges neutralizes the anionic surface charge allowing the particles to contact each other allowing the particles to contact each other.

+

+

+

+

+

+ +

+

+

+

+ +

+ +

+

+

+ +

+

+

+ +

+

+ + + +

+ +

+ + + + +

+

ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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Solid Particles Coagulated into Flocs ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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Flocculant occu a t 

Cationic, Anionic, or Nonionic , ,

High Molecular Weight

Particle Bridging Agent

Use Alone or with Primary C Coagulant l t

ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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Flocs Bridged Together with a Flocculant ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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Relattive Mo olecularr Weigh ht

Flocculants

Primary Primary Coagulants

Dispersants

‐100

‐80 ‐60

‐40 40

‐20

0

20

40

60

80

100

Percent Charge Density ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

46


Primary Coagulant Dosage Curve

Seettled Turbidity

Underdosed

Overdosed

Optimum Dosage Optimum Dosage Range

Polymer Addition Rate ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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Selecting the Treatment Program Selecting the Treatment Program – Jar Tests

ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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Purpose of Jar Testing Purpose of Jar Testing  Select Treatment Program  Predict Treatment Effectiveness P di t T t t Eff ti  Trouble Shoot Operation Trouble Shoot Operation  Recommend Treatment Adjustments Recommend Treatment Adjustments

ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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Effective Application Requires: Effective Application Requires:    

Product Selection Product Selection Feed Point F dS Feed System Dosage Control • • •

Continuous Feed Intermittent Feed Pace to Turbidity

ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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Polymer Handling Concerns y g 

Shelf Life

Separation

Freeze Protection

Spill Containment

Solution Preparation

Solution Aging Solution Aging ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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Calibration Tube For Draw Downs Do Not Draw Downs – Do Not Rely on Pump Settings

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tomh@chemtreat.com ChemTreat’s Steel Industry Water Conference 9‐12 to 9‐14‐2012 , Clearwater Beach FL * Confidential * Do Not Duplicate without Permission

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