Geotube Technology for Residuals and Biosolids Management

Transcription

1 Geotube Technology for Residuals and Biosolids Management

2 Introduction Outline Geotextile Container Introduction Chemical Conditioning Programs Feasibility Evaluations Online Optimization Case Studies

3 What is a Geotextile Container? GeotextileContainers offer a high volume, high flow containment option, for dewatering and consolidation of hydraulically dredged material.

4 Containment Dewatering Consolidation

5 Use of Geotextile Containers Geotextile Containers Can be used for Coarsegrain sediments Finegrain sediments

6 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 capinplace projects.

7 FineGrained 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.

8 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

9 Common Thread Chemical Conditioning

10 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

11 Principles of flocculation

12 Flocculation Before Flocculant is added After Flocculant is added

13 Traditional Product Selection Alow 90Bmedium 80 80Bmedium Charge density Alow 70Chigh 60Alow 60Bmedium Alow 50Chigh 90 90Bbranched 40Alow 40Bmedium 40Chigh 80 30Chigh 70 70Aslight 70Bbranched 20Alow 20Bmedium 60 60Aslight 60Bbranched 10Alow 10Chigh 50 50Aslight 40 40Bbranched 30 Molecular 30Aslight weight 20 20Aslight 20Bbranched Charge Density 80Chigh 40Chigh 30Chigh 10 10Aslight 0 Structure

14 Traditional Product Selection Alow 90Bmedium 70Alow 69Alow 68Alow 80 80Bmedium 67Alow Charge density Alow 70Chigh 60Alow 60Bmedium 50Alow 50Chigh 40Alow 40Bmedium 40Chigh 30Chigh 20Alow 20Bmedium 10Alow 10Chigh 66Alow 65Alow 64Alow 63Alow 62Alow 61Alow 60Alow 0 Molecular weight

15 Advancements in Sitespecific Product Selection Alow 90Bmedium 70Alow 69Alow 68Alow 80 80Bmedium 67Alow Charge density Alow 70Chigh 60Alow 60Bmedium 50Alow 50Chigh 40Alow 40Bmedium 40Chigh 30Chigh 20Alow 20Bmedium 10Alow 10Chigh 66Alow 65Alow 64Alow 63Alow 62Alow 61Alow 60Alow 0 Molecular weight

16 Polymer Selection Dry Emulsion Solution Polymer Forms

17 Chemical Optimization Factors Affecting Product Selection Makedown 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.

18 Jar Testing what to look for Release of free water Water clarity Floc Appearance Water release rate Dose optimization Filtered water targeted constituents removed

19 Sitespecific 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)!

20 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

21 GDT Test Collect samples of the sludge material to be dewatered.

22 GDT Test Pour all of the collected sludge into a 50 gallon container.

23 GDT Test Mix polymer thoroughly with the collected sludge until a floc forms.

24 GDT Test Pour the sludge into the GDT bag.

25 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.

26 GDT Test Collect, measure, and analyze the effluent water draining from the test unit.

27 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.

28 Online Optimization Considerations: Mixing energy/shear energy Slurry flow rate Water flow rate, water pressure Makedown contact time Density (watch out for sand) or Flow meter Control of Feed equipment Pre or Postdilution water in the slurry

29 Pilot Scale Test Smaller Geotextile Containers can simulate operational conditions when space, time, and/or budget considerations apply.

30 Pilot Scale Test Larger scale pilot tests can also be used (if space and budget allow) to provide very detailed information.

31 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

32 Use Software for Predictability Use Software Programs to Predict Quantity of Geotextile Containers

33 Simulator Programs Use SIMULATOR Programs to offer Dimensions Volumes Stresses.

34 WaterSolve, LLC 4964 Starr Street, SE Grand Rapids, MI (616) (616) (fax)