Geotube Technology for Residuals and Biosolids Management€¦ · • Geotextile Containers have...
Transcript of Geotube Technology for Residuals and Biosolids Management€¦ · • Geotextile Containers have...
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Geotube Technology for Residuals and
Biosolids Management
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IntroductionOutline
– Geotextile Container Introduction
– Chemical Conditioning Programs
– Feasibility Evaluations
– Online Optimization
– Case Studies
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What is a Geotextile Container?
• Geotextile Containers offer a high volume, high flow containment
option, for dewatering and consolidation of hydraulically dredged
material.
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Containment Dewatering Consolidation
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Use of Geotextile Containers
Geotextile Containers Can be used for
– Coarse-grain sediments
– Fine-grain sediments
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Coarse - Grain Sediment
• Geotextile Containers have been used to form berms, stabilize beaches, prevent erosion, form levees, peninsulas, groynes, and other manmade structures.
• Offer shear strength for landfill cap-in-place projects.
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Fine-Grained Sediments
• Technological advances in the application of
dewatering chemistry and Tube construction
allows for containment of solids and
contaminants, while providing a clean, safe
effluent of water that can be returned to the
receiving system.
• Geotextile Containers can now be used to
dewater and contain Metals, Dioxins, PCBs, PAHs,
Pesticides, Clays, Silt, and other organic
materials.
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Chemical Conditioning Optimization
What are my dewatering objectives?
• Containment/Consolidation
• Effluent Water Characteristics• Time to dryness• Total Dryness
What are my chemical conditioning choices?
• Organic Flocculents
• Organic Coagulants
• Inorganic Coagulants
• Hybrid Chemistries
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Common Thread
Chemical Conditioning
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Polymer Selection
Coagulation or Charge Neutralization – “like
getting magnets to come together”
• Cationic
• Anionic
• Nonionic
Flocculation – “to sweep the magnets together
into a pile”
• Molecular weight
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Principles of flocculation
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Flocculation
Before Flocculant is added After Flocculant is added
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“Traditional”
Product Selection
10A-low 10C-high
20A-low 20B-medium
30C-high
40A-low 40B-medium 40C-high
50A-low 50C-high
60A-low 60B-medium
70A-low 70C-high
80B-medium
90A-low 90B-medium
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Molecular weight
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10A-slight
20A-slight 20B-branched
30A-slight 30C-high
40B-branched 40C-high
50A-slight
60A-slight 60B-branched
70A-slight 70B-branched
80C-high
90B-branched
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Structure
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“Traditional”Product Selection
10A-low 10C-high
20A-low 20B-medium
30C-high
40A-low 40B-medium 40C-high
50A-low 50C-high
60A-low 60B-medium
70A-low 70C-high
80B-medium
90A-low 90B-medium
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Molecular weight
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70A-low
69A-low
68A-low
67A-low
66A-low
65A-low
64A-low
63A-low
62A-low
61A-low
60A-low
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Advancements in “Site-specific”Product Selection
10A-low 10C-high
20A-low 20B-medium
30C-high
40A-low 40B-medium 40C-high
50A-low 50C-high
60A-low 60B-medium
70A-low 70C-high
80B-medium
90A-low 90B-medium
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Molecular weight
Ch
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70A-low
69A-low
68A-low
67A-low
66A-low
65A-low
64A-low
63A-low
62A-low
61A-low
60A-low
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Polymer Selection
Polymer Forms
• Dry
• Emulsion
• Solution
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Factors Affecting Product Selection
Make-down requirements
Feed equipment requirements
Handling
Lead times/availability
Shelf life
Storage/Use Environment
Aquatic Toxicity
$/lb
Once determined:
Must evaluate those products on the bench and in small scale studies.
Chemical Optimization
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Jar Testing “what to look for”•Release of free water
•Water clarity
•Floc Appearance
•Water release rate
•Dose optimization
•Filtered water targeted
constituents removed
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“Site-specific”chemical conditioning program
• Identify charge density, molecular weight, and structure of optimal chemistry through bench testing
• Manufacture the chemistry
• Test chemistry in Performance Trials (Hanging Bag Test or GDT)!
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“What to look for in our Performance Trials”
• Timeline to target dryness
• Filtrate quality
• Volume released
• Conditioning efficiency & effectiveness
� Provides operational data
� Time to dryness and final outcome
predictions can be made
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GDT Test
Collect samples of the sludge material to be dewatered.
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GDT Test
Pour all of the collected sludge into a 50 gallon container.
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GDT Test
Mix polymer thoroughly with the collected sludge until a floc forms.
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GDT Test
Pour the sludge into the GDT bag.
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GDT Test
Lift the stand pipe slightly to facilitate initial flow into the bag. Continue adding sludge until it reaches the mark on the stand pipe indicating 1psi.
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GDT Test
Collect, measure, and analyze the effluent water draining from the test unit.
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GDT Test
After the test bag dewaters, a sample of sludge can be collected to determine moisture content and percent dewatered solids.
This can help to predict results in a full scale project.
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Online Optimization Considerations:
•Mixing energy/Shear energy
• Slurry flow rate
• Water flow rate, water pressure
• Make-down contact time
•Density (watch out for sand) or
Flow meter Control of Feed
equipment
• Pre or Post-dilution water in the
slurry
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Pilot Scale Test
Smaller Geotextile Containers can simulate operational conditions when space, time, and/or budget considerations apply.
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Pilot Scale Test
Larger scale pilot tests can also be used (if space and budget allow) to provide very detailed information.
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Pilot Scale Test – Deliverables• Filtrate quality
• Dewatering rate
• Consolidation
• Dosing and dose control
• Chemistry injection points
• Dilutions of slurry
• Chemical use costs
• Time to dryness
• Total dryness
• Other operational parameters to aid in full scale estimators
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Use Software for PredictabilityUse Software Programs to Predict Quantity of Geotextile Containers
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Simulator Programs
Use SIMULATOR Programs to offer
� Dimensions� Volumes� Stresses.
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WaterSolve, LLC
4964 Starr Street, SE
Grand Rapids, MI 49546
(616) 575-8693
(616) 575-9031 (fax)
www.gowatersolve.com
www.geotube.com