Solutions for Odor & Corrosion Control
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Transcript of Solutions for Odor & Corrosion Control
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Solutions for Odor & Corrosion Control Providing solutions not just products
Local representative since 1996 www.GoTDM.com800.300.2844
Turnkey System integrator and distributor – proving regional field service and installation
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New company – cooperative venture including TDM and Gasho Associates More capabilities including field service of equipment Developing new technology for dry media
System Integrator
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Contacts
TDM:George FedericoTechnical Assistance – proposals, etc
Gasho Associates – Shaun Kelley local sales Rep –
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Offering multiple technologies Biofilters
Carbon/media system Chemical scrubbers Thermal oxidizers Odor prevention
Offering the best technologies OdorTool Biofilters
Theia Air Carbon & Dry media Altech Scrubbers
Colt Technolgies - Oxidizers Venturi Aerators
Weatherford H2S Scavengerwww.GoTDM.com
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www.GoTDM.com
We provide solutionswe work with you to find the best solution for you and
your client – we do not force fit what we sell to the project
Knowledge and experience We know the technologies and are experts in treating air
and odor
Scope of supply to fit the project every project has different requirements. We can
provide turnkey systems and even install them or just components - your call
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www.GoTDM.com
The TDM/Theia Air difference
We work with you when you are designing your system, installing your system and for years afterwards – all systems and equipment can have problems – we will be there for you if ours does
We will be there for our customers –even when it is not our equipment
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www.GoTDM.com
The TDM/Theia Air difference
We provide a total approach to odor control.
This means everything from collection to dispersion
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What is an odor exactlyOdor is a sensory reaction to one or more aromatic gases.
Like noise, it is a perceived offense.
Like Noise, this somewhat nebulous term CAN be scientifically defined
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We define one OU ( odor unit) as the point at which the “average person” begins to detect an odor
Defining odors
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Malodor Odor Description Odor Threshold Hydrogen Sulfide Rotten eggs 3 ppb Mercaptans Skunk, rotten cabbage,
putrid garlic 20 ppt to 300 ppt
Carbon Disulphide Rotten vegetables 200 to 800 ppb Dimethyl sulphide Decayed vegetables 1 ppb Indole, Skatole Fecal, nauseating 100 ppt Amine Putrid, fishy 400 ppt to 100 ppb Ammonia Pungent, irritating 17 to 50 ppm
“Sewage Odors”
Removing some of the compounds will reduce the odor but may not eliminate the problem
We must reduce all of the odorous compounds to be successful
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What is Odor Control Exactly ??Simply put, we are trying to prevent odorous compounds from reaching sensory perceptors ( people)
Before we design the treatment equipment, we should define what is required to meet this goal
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Dispersion Modeling
Neighbor
Lift Station
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Biofiltration BasicsIn general, contaminated air passes through a fixed bed of media- Media has a thin film of water on the outside- Contaminant gases are solubilized into this film of water where they can be digested by the microbes
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Simple Schematic of conventional system
1st & 2nd Generation
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Just because something looks good on paper does not mean it will work in the field
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Media Makes a Difference ! Synthetic media is now widely used – media does
not break down The media will last but the performance is still not
there
Second Generation
Better but not good enough
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• Void volume only 35% (Less Effective EBRT)• poor water distribution poor air flow• No means for control of biomass• Higher Pressure Drop, increases over time• Un-Predictable performance• Media is typically treated with chemicals, food,
etc
Second GenerationRandom Packed Media:
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Void or pore volume is all that really matters – and they fall short
Effective bed volume
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Water build up and dry spots render another portion as useless
Dry = no bacteria and no solubilization Water and biomass buildup block the air sending it elsewhere
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So what is the actual effective EBCT ????
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More advanced (Structured) MediaDual Zone Bed; Zone A provides an optimal area for a
robust colony of bacteria to reside while Zone B is the “transfer zone” .
Void Volume >95% (Effectively increases EBRT)
Complete treatment, due to uniform distribution of air
Low pressure drop, will not increase over time
Maintains its structure over life ensuring predictable performance
Third Generation
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Structured Packing
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Structured Packing Bacteria Growth
Air flow
Water Layer
Vessel Size
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Structured Packing
Air flow
Water Layer
95 % Void Volume
Vessel Size
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Air flow
Water Layer
no Water Buildup
No dry spots
100% media utilization Vessel Size
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Most Systems are overly complicated
• larger media beds – big footprint, very heavy •Typically very expensive •Humidification systems – complicated – require a lot of maintenance•Multiple spray nozzles
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Pretty Simple One spray nozzle = even distribution of water
No recirculation of water
No humidification system
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Control the water –► control the air, control the bugs
Simple Rule, Simple System
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Most biofilters fail due to poor control of the water
– uneven water = uneven air = poor treatment = poor biomass
By controlling the flow of water through the system we control the air flow keeping it evenly distributed
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What does the air flow pattern look like here ?
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Structured Packing Bacteria Growth
Air flow
Water Layer
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Taking it one step further› Biomass control.
Getting a strong healthy bacteria colony to grow is important but is only part of the battle
Keeping this biomass from fouling or otherwise interfering with the equipment is just as critical
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Biomass Engineering Multiple contaminants require
multiple bacterial colonies This requires multiple strata to
develop which strongly favors a taller media bed
We do not recirculate the water which allows this stratification to take hold
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Odortool biofilters are compact, require little or no maintenance and use little water and no chemicalsThese systems offer high removal efficiencies and very low operating costs Permanent media means no replacement concerns
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Most InstallationsWorldwide
100% success rate
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Taking on your toughest applications without all the mess and expense of wet scrubbers.
New media that can take on the highest levels of H2S & mercaptans without a big footprint and without changing the media out frequently
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Oxidizers Thermal Oxidizers are effective on sludge applications
RTO’s ( Regenerative Thermal Oxidizers) are the best approach – lowest maintenance and lowest operating costs
They are slightly more expensive than RCO’s ( Recuperative thermal oxidizers) – usually 5-15%
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we offer skid mounted and field erected RTO’s ( Regenerative Thermal Oxidizers to treat any size air stream – we also offer RCO’s
Biosolids, Sludge, drying, etc is our specialty
We offer upgrades and retrofits to existing units to reduce your operating costs
•27 years of experience •Full field capabilities •Safe, reliable design
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Which one is right for me?For sludge drying and other low VOC applications, RTO’s are the best choice.
•RTO’s use a lot less fuel•RTO’s require a lot less maintenance •RCO’s typically require a rebuild after 5-7 years due to the heat exchangers rusting out
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Structured media
Our design allows for removal of heat recovery media from the chambers quickly and easily
Media can be cleaned and put back in all in one day
This will be required once every 2-3 years
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Colt is the recognized leader in Thermal Oxidizers but we do not stop there
We offer the best field and technical support of any company
We spend a lot of time replacing or fixing our competitors units
Better Design, Better Support
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Other Products
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Another method is to permanently eliminate the H2S and Mercaptans using a little chemistry
Sulfa Clear from Weatherford
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What is Sulfa-Clear Patented technology from the oil & gas
industry that safely and effectively eliminates H2S
Proven over 20 years of history Polymeric Amine Condensate that
converts sulfides to a Polyamine Sulfide Introduced at a single or multiple
injection points
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Safe & easy to work with Non-Hazardous Non-Flammable Freeze point in excess of -
20F No special storage
considerations No mixing required
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Why Use Sulfa-Clear Permanently eliminates H2S &
mercaptans Is specific to these compounds – can be
added in one place Reacts to form a corrosion inhibitor No solids build up Environmentally friendly Ease of handling
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Designing an odor control system
There are several important steps to designing the best odor control system for your your project
We are here to help
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There is no one right technology for all applications
Often a single technology is not the best approach
Especially for a complex mixture of odors as we see in sludge handling
For these applications the two main approaches are
Biofilter/carbon Oxidizer
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Start with Biofiltration Biological Treatment is most effective on compounds which are soluble or partially water soluble
Compound Removal efficiency H2S 99% plus Aldehydes 90-99% Ketones 90- 99%
Mercaptans: 75-85%DMS/DMDS : 65-75%VOC’s 55-85% ( depending on weight, etc)
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What is biofiltration really ?? It is the capture and destruction of
compounds using a complex combination of bacterial colonies which consume the various contaminants
We must first capture the contaminantsThen create the ideal environment for these multiple bacterial colonies to do their work without impeding the airflow
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Sizing Criteria Surface Velocity –must be slow enough to allow capture – this affects the diameter of our unit but is not usually in play,
EBCT – residence time, contact time, etc –a relatively useless measure, on its own, used by engineers to try to normalize a bid –
useful EBCT or pore volume is what actually matters – not unlike carbon.
To some extent, the more pore volume, the better the performance but there are diminishing returns
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DerryBased on a flowrate of 600 CFM, we can use our second smallest series, 1500 which indicates a 5 foot diameter media bed
Because of the variety of compounds present, we want as many layers of media as possible. 3 layers is the maximum number for these smaller systems and we have a height and size limitation.
We check the initial design to verify the design point. Based on the number of CFU’s required and number of colonies, this is sufficient media volume and height to achieve 90-95% odor removal through this stage
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Next – look at dry media As with Biofilters, design is everything – stuffing a bunch of carbon into a drum is not going to cut it
We utilize 2-5 different medias depending on what we are expecting to see
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Compound Removal efficiency H2S 99% plus Aldehydes 90-99% Ketones 90- 99%
Mercaptans: 99%DMS/DMDS : 99%VOC’s 95-99% ( depending on weight, etc)
Combined Efficiency of dry media unit
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DerryTA- OC –• surface modified media – removes H2S and other reduced sulfur compounds as well as some nitrogen molecules•It is also a virgin carbon that will remove some VOC’s – heavier ones
TA-OM –•Chemically impregnated media – oxidizes the more difficult compounds and captures them – •Very effective on mercaptans as well as DMS, etc
TA-VCC •Virgin carbon – microporous – removes the most aromatic compound
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COMPOUNDINLET(PPMV)
After Bio
After Primary Media
After Secondary media
Hydrogen Sulfide 10.15 0.203 0.00203Carbonyl Sulfide 0.8 0.2 0.01Methyl Mercaptan 8.54 2.135 0.10675Acetaldehyde 2.51 0.3765 0.018825Isobutyraldehyde 4.28 0.642 0.0321isovaleraldehyde 8.54 1.281 0.06405p-cymeme 0.882-methylbutanal 7 2.1 0.105
Derry
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Because dry media is consumable, we must check the usage of the media to verify that we will have sufficient bed life to achieve the required odor removal for the prescribed period of time before the media requires replacment.
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Final step ( is actually based on the first one) Dispersion enhancement – basically we are using our surroundings as well as our discharge to mix what little odor remains with as many air molecules as possible so that by the time the off-gas reaches people, we are below one OU