Effective Strategies for Residual Polymer and Aquatic Toxicity Testing For Dredge Slurry Dewatering Western Dredging Association 2012 Midwest Chapter Randy Wilcox, Gregg Lebster WaterSolve, LLC Bruce Rabe Environmental Resource Management April 27, 2012

Introduction Chemical Conditioning Basics Residual Polymer in Return Water Aquatic Toxicity Testing Residual Polymer Testing Case Studies

Chemical Conditioning Determination of Objectives Consolidation Effluent / Filtrate characteristics Removal of contaminates Other objectives

Chemical Conditioning Dewatering Chemicals Organic Flocculants Organic Coagulants Inorganic Coagulants Hybrid Chemistries

Chemical Conditioning Description of Application Inline Injection Mixing Energy Requirements Options for Automatic adjustment of feed rate Adjustment based on visual observation

Preliminary Testing Polymer Selection and Dose Determination (Jar Testing) Larger Scale Test Geotube Dewatering Test (GDT) Hanging Bag Test Pilot Scale Test

Aquatic Testing Basics State Regulatory Requirements Testing Requirements Specific Test Objectives Salinity Test Species Test Duration Test End Points Daphnia magna Fathead Minnow

Aquatic Toxicity Testing Sample Collection Test Initiation Solution preparation Water quality Organism Loading Test Monitoring Observations Test solution renewal

Aquatic Toxicity Testing (cont.) Test Determination Survival Growth Reproduction End point Data Analysis / Statistical Evaluation

Residual Polymer Testing Description of “China Clay” Test Qualitative Test Quantitative Test

Case Studies Florida Keys Project Southern Shores, NC Project

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