Innovative Water Processing Solutions By Water Quality Management Professionals
• What is the goal? • Why are the new benchmarks so difficult to meet? • How can these pollutants be removed? • What should you keep in mind when designing a system?
• Have you mapped pollutant sources? • Is source control in place? • Are BMPs in place? • Are BMPs being maintained? • Can you isolate or eliminate problem outfalls? • Can you infiltrate or reduce your discharge? • Are you sampling correctly? • Do you qualify for any waivers? • Do you qualify for any grants?
…and still have a problem?
We don’t have room to let nature work it’s magic. We utilize treatment to speed up the process.
Benchmarks You
Removed by Sand Filter Dissolved Substances
In order to find our “needle” – we need to muck through some of the “hay” first.
METAL CEMENT SCRAP GALVANIZER LOG PLANT METAL YARD
Storm Intensity, Volume, and Season Changing Site Conditions
Gravity Filtration Absorption Adsorption
Gravity Filtration Absorption Adsorption
Gravity Filtration Absorption Adsorption
Gravity Filtration Absorption Adsorption
1 gram = ~500m 2 surface area One 2000lb Vessel = ~175 square miles of surface area
CATCH BASIN POND Footprint Algae Pest Control No Storage No Settling VAULT Power Cycling Confined Space Construction Cost Visual Inspection
OIL COALESCING ABSORBENT MEDIA BOOMS GRAVITY SEPARATION VAULTS
Solid Vita-D-Chlor tablets dissolved in flowing steam Liquid 50% Sodium Hydroxide delivered via peristaltic pump Raise pH Lower pH Gaseous Carbon Dioxide delivered via bubbler hose Liquid 15% Muriatic Acid delivered via peristaltic pump
Solid Vita-D-Chlor tablets dissolved in flowing steam Liquid 50% Sodium Hydroxide delivered via peristaltic pump pH can be adjusted manually or by using automated control systems that utilize pH probes and dosing logic Raise pH Lower pH Gaseous Carbon Dioxide delivered via bubbler hose Liquid 15% Muriatic Acid delivered via peristaltic pump
At a pH of 8, up to 8000ppb of Zinc will be soluble At a pH of 10, only 90ppb of Zinc will stay in solution
A stormwater sample with a pH of 8 has 1000ppb of Zinc content By adding a base and shifting the pH to 10, ~910ppb of Zinc will precipitate out as Zn(OH) 2 because the Zinc saturation point has been lowered
• Zn(OH) 2 is a polar molecule that reacts more readily with other polar molecules (like itself or coagulants) than solubilized Zn 2+ • The Zn(OH) 2 itself is still too small to filter, but now with its added electrostatic strength, it is much more likely to react with other polar molecules or coagulants in solution and agglomerate into larger diameter particles • The remaining soluble, non-precipitated Zn 2+ can still be removed through physical entrainment within the forming floc and/or through light electrostatic association with polar molecules • Other multi-metal co-precipitation and formation of metallic oxides are also key to removing heavy metals and are not impacted by pH adjustment
Chitosan (Cationic BioPolymer) PolyDADMAC (Cationic Polymer) Iron or Aluminum (Cationic Coagulants) Chemical Coagulation – ie Aluminum Sulfate, Ferric Chloride Electrocoagulation – Fe or Al generated through electrolytic oxidation
STEEL HORIZONTAL $ POLY STEEL $ UPRIGHT UPGRADES WEIR $ DISSOLVED TUBE PLATE AIR SETTLER FLOTATION
Media Filter with Depending on media, can be a Bag Filter Cartridge Filter Automated Backwash combination of filtration and/or adsorption Inert: Sand, Glass Adsorptive: Alumina Oxide, Zeolite, Carbon Mixed Media Self Cleaning Filter Passive Filtration Ultra Filtration
WaterTectonics 6300 Merrill Creek Parkway Suite C-100 Everett, WA 98203 www.watertectonics.com
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