arsenic removal for potable water using a low-tech fe coagulation/filtration system eric rivera,...
TRANSCRIPT
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Arsenic Removal for Potable Water Using a Low-tech Fe
Coagulation/Filtration System
Eric Rivera, Civil Engineering NMSU
Luis Villareal, Civil Engineering NMSU
Adrian Hanson, Ph.D., PE, NMSU Professor Environmental Engineering
AMP URCA Conference4/17/08Corbet Center
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Acknowledgements
• New Mexico Alliance for Minority Participation (AMP)
• Desert Sands Mutual Domestic Water System• Edward Livingston; Livingston and associates
inc.
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Arsenic• A toxic element found in natural deposits in
the earth.• Dissolved into ground water as it moves
through the aquifer matrix.• Other sources:
– Fertilizers– Animal feeding operations– Industrial practices; copper smelting, mining, coal
burning
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Health risks• Cancer; bladder, lungs, skin, kidney, nasal
passages, liver, and prostate. (USEPA)
• Skin pigmentation changes, and hyperkeratosis(thickening of the skin) (WHO)
• Arsenic in drinking-water will cause 200,000 -- 270,000 deaths from cancer in Bangladesh alone. (NRC, 1998; Smith, et al, 2000).
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National Contamination Levels
Arsenic concentrations found in at least 25% of ground-water samples.
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EPA Regulations
• Maximum Contaminate Level (MCL)– 10 parts per billion (.010 parts per million) as of
January 23, 2006 – Any water system serving 15 locations or 25
residents year-round
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Desert Sands• Two operating wells, and one new well
awaiting approval• 17-27 parts per billion Arsenic• Serves about 650 connections (1,500 people).• EPA has granted an extension to meet new
standards• Recently had arsenic removal using an iron
oxide filter system: costly to maintain.–$30,000 or more per year
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Proposed Solution
• Low-tech FeCL3 Coagulation/filtration system–Complete removal of Arsenic–Low costs–Low maintenance–Simple operation
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The Treatment Method
• Coagulation-Creates particles that As adsorbs to and settles with.
• Filtration-removes remaining As/particles.
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Treatment Train
Inlet
Static mixer
Settling Chamber Filter
Outlet
Flocculation Chamber
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Jar Testing
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Results
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Results
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Arsenic Removal in Emergency Response Water Treatment
Portable Rapid Deployment System
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Chemical Delivery• Solid FeCl3 and solid Chlorine• Longer shelf-life for emergency situations
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Results• Reaction can occur rapidly enough to be effective• Oxidation is a problem
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Problems• Oxidation
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Future Applications• Emergency Treatment Unit (ETU)• Solid Chemical Delivery
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Thank YouThank You
QUESTIONS?