Using Magnesium Hydroxide

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1 Industrial Wastewater Neutralization Using Magnesium Hydroxide May 15, 2012 Steve Leykauf, Presenter

2 Discussion Topics What is Magnesium Hydroxide? Technical Benefits of Magnesium Hydroxide Economic Benefits of Magnesium Hydroxide Product Application

3 What Is Magnesium Hydroxide?

4 What Is Magnesium Hydroxide? React Magnesium Chloride Rich Brine with Dolomitic Lime CaCl 2 + MgCl 2 + H 2 O + CaO.MgO Manistee, MI - Brine Chemical Reaction Yields Mg(OH) 2 Milk of Magnesia! Woodville, OH Dolomitic Lime Magnesium Hydroxide Slurry

5 Magnesium Hydroxide Suspension Slurry Properties Typical Dry Solids, % 61.0 Bulk Density, lb/gal 12.8 Mg(OH) 2 Contained, lb/gal 7.7 Viscosity, cps 250 Mg(OH) 2 (dry basis), % 98.8 Median Particle Size, micron 3.0 % Passing 325 Mesh Screen 99.8

6 Wastewater Applications Acid Neutralization ph Adjustment Heavy Metal Precipitation Aerobic Wastewater Treatment Anaerobic Wastewater Treatment

7 Applications Chemical Processing Plants Food & Beverage (Biological) Heavy Metal Precipitation Municipalities Power Utility Plants Pulp & Paper

8 Technical Benefits

9 Technical Benefits Optimal Neutralizing Value Greater alkalinity contribution (pound for pound) Improves Biological Activity Magnesium is a nutrient provides ideal ph range Buffering Ability Naturally buffers at ~9.0 ph precluding ph excursions Will not endanger biomass Metals Removal Through precipitation and adsorption

10 Technical Benefits Improved Sludge Settling Less sludge volume compared to other alkalis Safe Non hazardous (by D.O.T. Standards), non corrosive, and safe for EMPLOYEES Environmentally Friendly Non Toxic to environment

11 Properties of Industrial Alkalis Mg(OH) 2 Ca(OH) 2 NaOH Na 2 CO 3 Alkalinity (lbs CaCO 3 per lbs dry solids) % Solids n/a Alkalinity (lbs CaCO 3 per gallon) Neutralizing Capacity (lbs OH - per lb dry solids) n/a

12 Replacement Capacities of Mg(OH) 2 Slurry One (1) Gallon of Magnesium Hydroxide Slurry Replaces: 1.77 Gallons of 50% Caustic Soda (NaOH) 7.69 Pounds of CaO (Dry Solids) 2.85 Gallons of 34% Ca(OH) 2 Slurry Pounds of Na 2 CO 3 (Dry Solids)

13 ph Relative Volume Mg(OH) 2 Efficiency Charts Dry Pounds of Neutralization Agent Required to Neutralize One Ton of Acid 6.0 Relative Sludge Volumes Using Various Alkalis Mg(OH)2 Ca(OH)2 NaOH Na2CO3 Sulfuric Hydrochloric FloMag H/HUS Ca(OH)2 NaOH Titration Curves for Various Alkalis Titration Percent Lime Caustic Soda FloMag H/HUS

14 Summary of Benefits vs. Caustic Soda Supplies 32% More CaCO 3 Alkalinity 1.68 Lbs of CaCO3 per Lb of Mg(OH) 2 Only 1.23 Lbs of CaCO3 per Lb of NaOH Much Safer to Handle Low Solubility = Longer Lasting Alkalinity and ph Control Provides Soluble Magnesium Essential for Cellular Respiration of Biomass Buffers to ph of 9.0 Caustic Soda ph excursions can be detrimental to biomass

15 Economic Benefits

16 $ Per Dry Ton Caustic Soda Pricing (Dry Ton Basis) $1,000 $900 $800 $700 $600 $500 $400 $300 $200 $100 $0 NaOH Mg(OH)2 Source: Chemical Week; MMMS Sources

17 Economic Benefits Caustic Soda Price Volatility Leads to Economic Uncertainty 1. Notice Magnesium Hydroxide Price Stability 2. Use Less Magnesium Hydroxide Slurry due to its higher alkalinity contribution per gallon! Cost Summation Over 4 ½ Years Suggests... Magnesium Hydroxide Slurry is 50% Less Expensive Than Caustic Soda!

18 Economic Benefits Consider All Cost Reductions: Less Chemical Use Sludge Disposal Costs Costs for Acids Costs for Polymers Reduced Transportation Costs

19 Product Application

20 Product Application Magnesium Hydroxide is a Suspension Intermittent Agitation Complete Wastewater Profile Form Determines Candidacy for Success Perform Laboratory Titrations Develop Comprehensive Report Describing Technical / Economic Merit Engineers Make Equipment Recommendations

21 Product Application Equipment Skid-Mounted Mg(OH) 2 Tote System with Agitator, Feed and Transfer Pumps Twin 2500-gallon Mg(OH) 2 Storage Tanks with Pump House

22 Thank You! Steve Leykauf

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