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Thioguard ® Non-hazardous chemistry for municipal wastewater.

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Presentation on theme: "Thioguard ® Non-hazardous chemistry for municipal wastewater."— Presentation transcript:

1 Thioguard ® Non-hazardous chemistry for municipal wastewater

2 Added directly to wastewater Thioguard stops odors, corrosion and grease buildup that cause blockages and sewer failures. Thioguard ® TST Total System Treatment And Thioguard is environmentally safe and improves wastewater treatment and discharge water quality.

3 Premier has been in the magnesia business for over 35 years. We’re the largest U.S. producer of magnesia chemicals. Premier R&D developed Thioguard ® magnesium hydroxide for municipal collection systems. Major plants in Nevada and Florida. Seven hydration facilities across the U.S. AZ, CA, FL, NC, NV, PA, TX. Premier has been in the magnesia business for over 35 years. We’re the largest U.S. producer of magnesia chemicals. Premier R&D developed Thioguard ® magnesium hydroxide for municipal collection systems. Major plants in Nevada and Florida. Seven hydration facilities across the U.S. AZ, CA, FL, NC, NV, PA, TX. IntroductionIntroduction

4 During the past 25 years regulatory changes have fundamentally altered the physical, chemical and biological properties of municipal wastewater.

5 In the year 2000 the EPA estimated that municipal sewers subject to corrosion are failing six times faster than the rate at which they are being rehabilitated.

6 By 2016 the EPA projects more than 50% of the country’s 600,000 miles of sewers will be in poor, very poor or inoperable condition.

7 Thioguard ® is a safe, cost saving and environmentally responsible chemical strategy which prolongs infrastructure life, manages wastewater odor, prevents plant upsets, improves treatment and enhances biosolids quality.

8 While there are many more, here’re three simple reasons to consider this straightforward technology

9 Raising wastewater pH from 7 to 8 eliminates hydrogen sulfide gas and extends the useful life of infrastructure subject to corrosion by over 80%. 1.) Reduced Corrosion and Odor

10 Henry’s Law - Gas/Liquid Phase Equilibrium SRB Inhibition - Sulfate Reducing Bacteria Sulfide Complexation - Magnesium Polysulfide Saponification - Fat and Grease Reduction Modes of Action:

11 H 2 S and Wastewater pH

12 The red area represents how much gas is produced in this example. The amount of gas produced is affected by the wastewater pH. Higher pH = less gas. Here’s what Thioguard does. > 80% Reduction H 2 S Gas Wastewater

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14 pH 7 to 8 is an 81.8 % reduction in corrosion rate. Corrosion and wastewater pH At 8.5, 93.8 % reduction.

15 Corrosion: A function of surface pH At pH 2 cast concrete corrodes at about 1/4 inch per year. Source L.A.County San District Corrosion begins about pH 5 and increases Rapidly below pH Corrosion Rate (in./year) pH Corrosion Range

16 Why Magnesia? Property50% NaOH30% Ca(OH) 2 60% Mg(OH) 2 % Hydroxide Solubility (H 2 O, g/100ml) Per million gallons 1750 tons 7.7 tons 75 lbs Reactive pH Freezing Point °F Weight Equivalency

17 City of L.A. Sanitary District

18 Headspace Hyrogen Sulfide Before and After Thioguard Before Thioguard After Thioguard City of St. Petersburg, FL

19 Sulfate reducing bacteria (SRB) operate best at pH 6.6 to 6.8. A small amount of Thioguard raises wastewater pH to reducing the efficiency of the SRB’s and causing less sulfide to be produced.

20 SRB Growth SRB Growth Rate

21 Unlike other alkali choices, Thioguard contains slowly dissolving Mg(OH 2 ) particles. These particles have high surface pH and high surface area, but relatively low solubility. (Surface area = nearly 1 acre per gallon).

22 High pH zone ~ 10.5 Slowly Dissolving Mg(OH) 2 Particle Surface Undissolved magnesium hydroxide particles react directly with H 2 S converting H 2 S to magnesium polysulfide.

23 University Research

24 Controlling Hydrogen Sulfide In Wastewater Using Base Addition Matthew J. Higgins, Bucknell University R. Dwayne Myers, Bucknell University Nicolle M. Sprague, Bucknell University Kevin Barron, Bucknell University Controlling Hydrogen Sulfide In Wastewater Using Base Addition Matthew J. Higgins, Bucknell University R. Dwayne Myers, Bucknell University Nicolle M. Sprague, Bucknell University Kevin Barron, Bucknell University The Effect Of Cations On The Settling And Dewatering Of Activated Sludges Matthew J. Higgins and John T. Novak The Effect Of Cations On The Settling And Dewatering Of Activated Sludges Matthew J. Higgins and John T. Novak Equivalent Addition Of NaOH, Ca(OH) 2, And Mg(OH) 2 Effect of pH On Kinetics Of Sulfate Reducing Bacteria Matthew J. Higgins, Ph.D. Assistant Professor Department of Civil Engineering Bucknell University Equivalent Addition Of NaOH, Ca(OH) 2, And Mg(OH) 2 Effect of pH On Kinetics Of Sulfate Reducing Bacteria Matthew J. Higgins, Ph.D. Assistant Professor Department of Civil Engineering Bucknell University The Effect of Influent pH on Aerobic and Anaerobic Treatment Systems Matthew J. Higgins, Assistant Professor Ezra Yarnell, Graduate Research Assistant Department of Civil Engineering Bucknell University Lewisburg, PA The Effect of Influent pH on Aerobic and Anaerobic Treatment Systems Matthew J. Higgins, Assistant Professor Ezra Yarnell, Graduate Research Assistant Department of Civil Engineering Bucknell University Lewisburg, PA

25 The Effect of Base and Nitrate Addition on H 2 S Production in Wastewater Matthew J. Higgins Assistant Professor Bucknell University The Effect of Base and Nitrate Addition on H 2 S Production in Wastewater Matthew J. Higgins Assistant Professor Bucknell University The Release of Nitrous Oxide Due to Nitrate Addition to Wastewater Matthew J. Higgins, Ph.D. Department of Civil and Environmental Engineering Bucknell University Lewisburg, PA The Release of Nitrous Oxide Due to Nitrate Addition to Wastewater Matthew J. Higgins, Ph.D. Department of Civil and Environmental Engineering Bucknell University Lewisburg, PA Dewatering And Settling Of Activated Sludges: The Case For Using Cation Analysis Matthew J. Higgins and John T. Novak Dewatering And Settling Of Activated Sludges: The Case For Using Cation Analysis Matthew J. Higgins and John T. Novak Controlling Hydrogen Sulfide In Wastewater Using Base And Nitrate Addition Matthew J. Higgins, Dwayne Myers, Nicolle Sprague, and Kevin Barron Civil Engineering Department Bucknell University Lewisburg, PA, Controlling Hydrogen Sulfide In Wastewater Using Base And Nitrate Addition Matthew J. Higgins, Dwayne Myers, Nicolle Sprague, and Kevin Barron Civil Engineering Department Bucknell University Lewisburg, PA, 17837

26 A large percentage of wastewater collection blockages (even in mains) can be traced to FOG. Blockages are serious, causing sewage spills, manhole overflows, or sewage backups in homes and businesses. Mild saponification eliminates downstream FOG blockages and odor. 2.) Reduced FOG Buildup (Fats, Oils and Grease)

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28 Before Treatment

29 After Treatment

30 Biological treatment plants and collection systems operate better with wastewater that has proper, stable pH, lower acidity and higher available alkalinity. 3.) Reduced Plant Upsets and Improved Treatment

31 Benefits of Thioguard in Bio-Treatment BiologicalTreatmentBiologicalTreatment Removal of organics Biological conversion of ammonia to nitrate Reduction of sludge mass and volume

32 Effect of Mg 2+ on Secondary Treatment Mg 2+ affects bioflocculation or aggregation of microbes Mg 2+ affects bioflocculation or aggregation of microbes

33 Importance of Bioflocculation - Bioflocculation Affects: 1. Floc Size 2. Floc Density 3. Floc Strength - These parameters are key to good settling and dewatering

34 Importance of Settling and Dewatering Settling Affects Overall Plant Efficiency Settling Affects Overall Plant Efficiency - Effluent Suspended Solids - Effluent Suspended Solids - Effluent BOD - Effluent BOD Most Effluent Problems Associated with Poor Settling Most Effluent Problems Associated with Poor Settling Dewatering is a Large Proportion of O&M Costs in Activated Sludge Plants Dewatering is a Large Proportion of O&M Costs in Activated Sludge Plants

35 Divalent Cation Bridging Theory Negatively charged sites on exocellular biopolymer are bridged by divalent cations such as Ca 2+ and Mg 2+ Negatively charged sites on exocellular biopolymer are bridged by divalent cations such as Ca 2+ and Mg 2+ This bridging helps to stabilize the microbe- biopolymer floc matrix This bridging helps to stabilize the microbe- biopolymer floc matrix

36 Divalent Cations Can be Displaced by Monovalent Ions

37 Schematic of Floc Matrix ++

38 Headworks Corrosion Odor Grease PrimaryTreatment Settling Corrosion Odor Metals Removal BOD 5 COD Plant Benefits

39 BiologicalTreatment pH Stability Corrosion Odor Nitrification SecondaryTreatment Floc-formation Cation Balance Corrosion Dewatering pH Stability TSS BOD 5 SVI Odor MLSS MLVSS Filamentous Bulking RAS Microbe Nutrition/Activity Energy Costs Polymer Use COD

40 EffluentAlkalinity TSS TDS Recycling Residual Chlorine Digestion Alkalinity Microbe nutrition pH Stability Gas Production Corrosion Dewatering Sludge Conditioning Biosolids Quality SAR Phosphorus Disinfection Chlorine Demand Plant Benefits

41 Improved Safety and Environmental Compliance Improved Safety and Environmental Compliance System Wide Odor Control Treatment Enhancement Effluent Quality and Plant Capacity - BOD, COD, SVI, TSS, MLSS, MLVSS, RAS, DOC Better Biosolids Volume and Disposal Better Biosolids Volume and Disposal System Wide Corrosion Control This one simple strategy provides:

42 Potassium Permanganate Sodium Hypochlorite Chlorine Hydrogen Peroxide Nitrates Iron Salts Thioguard Relative Cost / MGD Peak Sulfide Concentration (mg/l) Relative Chemical Costs

43 BiologicalTreatmentSecondaryClarifier Digestion Effluent Conditioning Dewatering DewateringConditioning PrimaryTreatment CollectionSystem Disinfection BiologicalTreatment PrimaryTreatment Conditioning BiosolidsConditioning Biosolids Digestion SecondaryClarifier CollectionSystem Effluent Disinfection Thioguard ® TST Total System Treatment

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