DEEP DIVE INTO DRY MEDIA SYSTEMS WEF Air Quality & Odor Control - - PDF document
2/28/2019 1 DEEP DIVE INTO DRY MEDIA SYSTEMS WEF Air Quality & Odor Control Committee Tuesday, February 28, 2019 1:00 2:30 PM ET 2 1 2/28/2019 How to Participate Today Audio Modes Listen using Mic & Speakers
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Speakers
Telephone” and dial the conference (please remember long distance phone charges apply).
the Questions pane.
for replay shortly after this webcast.
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systems
considerations and media selection
conversion with certain types of media
challenges
Black & Veatch
Jacobs
Hazen and Sawyer
King County, WA
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replacement
constituents
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Physical Adsorption: potential energy from Van der Waal nuclear forces of attraction Chemical Adsorption: chemical bonding between the adsorbate and the adsorbent Reactive Adsorption: Combination of physical and chemical adsorption
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Pelletized media Granular media
Pressure drop, in WC. per foot media @ 50 fpm velocity, dense pack Granular media: 2.0” WC Pelletized media: 0.9 “ WC
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Carbon (Centaur)
applications
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V-Bank Custom Configurations
available
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Carbon Type Ignition Temperature
Virgin Coal Based 380-425 ºC Chemical Impregnated 200-225 ºC
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Coconut shell Virgin activated KMnO4 impregnated High capacity
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Rotten Vegetable (MM) Rotten Vegetable (MM) Rotten Garlic (DMDS) Canned Corn (DMS)
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Senior Principal Engineer
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Type Advantage Disadvantage ~H2S Capacity*
Virgin Least expensive Lowest H2S capacity 0.06 Impregnated Higher H2S capacity than virgin Potential for combustion (caustic) 0.14 Regenerable Regenerable on site Deteriorating capacity 0.12 High Capacity Very high H2S capacity Primarily H2S specific 0.30 * g H2S/cc carbon 35 36
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impregnated alumina
impregnated zeolite
Modified DMS Capacity Test
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Drain (Typ.) Mist Eliminator & FOG Screen Fan Scrubber Vessel Exhaust Stack Flexible Connectors Flange Connection (Typ.) Silencer Damper Odor Source 2 Odor Source 1 Scrubbed Air
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fan sheaves are rotating
noise that could indicate bearing failure
dirty environments
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& gas)
indication of fouled media and reduced airflow
Traditional Deep Bed (WEF 2004)
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electronic detector or colorimetric tubes to verify concentration is not at a hazardous level prior to using your nose!
(WEF 2004)
H2S Meter
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at stack
If sampling port not provided as part of stack samples can be collected using simple PVC pipe.
Exhaust Stack Sampling Port
Exhaust Stack Air Flow
Air Flow for Sampling 2” PVC Pipe
sampling probe as shown to the right
usually sufficient to drive sample through 25’ of pipe
Ball Valve
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PVC Sampling Probe
(H2S) and odors at scrubber sampling ports
capacity remains
port and work back
will help you manage the asset!
Downstream Port Upstream Port Airflow
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Traditional Deep Bed WEF (2004)
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(King Co. 2016)
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(King Co. 2016)
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Apgar 2014
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FRP Grating Media Retention Panels FRP Perimeter Grating Gussets (note bolts through panels) FRP T-Section to Bridge Multiple Panels
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FRP Box Beams Installed to Reinforce Carbon Retention Grating
Added Grating Retention
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Carbon Grating Retention Box Beams Installed During Scrubber Fabrication
Dry Media Hydrogen Sulfide Concentration Average Maximum Plain, virgin activated carbon 5 10 Caustic impregnated carbon 10 50 High H2S capacity carbon 30 70 Proprietary dry media Manufacturer’s recommendationa Manufacturer’s recommendationa
a Verified by independent third-party testing or pilot testing at a WTD facility by WTD personnel.
King County – WTD Dry Media Standards for Hydrogen Sulfide Concentrations
(King Co. 2016)
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Target Pollutant: Hydrogen Sulfide Pollutant Molecular Weight: 34 lb/lbmol Media H2S Adsorption Capacity: 0.04 g/cm3 Media Density: 33 lb/Ft3 Target Pollutant Concentration (ppmv) 5 ppmv Media Bed Volume 150 Ft3 Media Price $1.5/lb Assume molar volume of foul air to be 385 Ft3 at 68o F Step 1: Calculate Pollutant Mass Flow Rate (PMFR) PMFR = (Air Flow Rate) / (Molar Volume of Air) x (Pollutant Concentration) * (Pollutant MW) PMFR = (2,500 Ft3/min) / (385 Ft3/lbmol) * (5 parts/1,000,000 parts) * (34 lb/lbmol) PMFR = 0.001 lb H2S/min Step 2: Calculate Media Bed Life (MBL) MBL = (Media H2S Adsorption Capacity) x (Media Volume) / (PMFR) MBL = (0.04 g H2S/cm3 media) x [(2.54 cm/in) x (12 in/ft)]3 x (150 ft3) / (454g/lb) / [(0.001 lb H2S/min) x (1440 min/day) x (30 day/month)] MBL = 8.7 months Step 3: Calculate Annualized Cost (AC) AC = (Media Cost per Pound) x (Media Volume) x (Media Density) / Media Bed Life AC = ($1.50/lb) x (150 Ft3) x (33 lb/Ft3) / [(8.7 month) x (1 year / 12 month)] AC = $10,241/year
(Apgar 2016)
Wastewater Treatment Plants. Manual of Practice 25. Water Environment Federation, Alexandria, VA.
Carbon Media Alternatives for Wastewater Odor Control.” Water Environment Federation Air Pollutants and Odor Emissions Conference Proceedings. Milwaukee, Wisconsin. March 21 - 24, 2016.
Odor and Hydrogen S ulfide Induced Corrosion Cont rol –Design S t andards. Seattle, WA.
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1/2.5 of an inch 10 millimeters
Macroscopic Crack/Crevice Activated Carbon Granules Voids in the Packed Bed
10X magnification in next slide
Agglomerated/Carbonized Coal Particulates Macroscopic Crack/Crevice
10 X magnification in next slide 1/25 of an inch 1 millimeter
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