Municipal (Water-Wastewater) Facilities - Purafil

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ODOR TOXIC GAS CORROSION 

CONTROL SCRUBBING CONTROL

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ODOR 

TOXIC GAS CORROSION 

CONTROL SCRUBBING CONTROL 

CLEAN AIR SOLUTIONS for WATER & WASTEWATER APPLICATIONS 

PREVENTING ODORS & CORROSION + ELIMINATING THE RISK OF TOXIC GAS RELEASES 

Purafil, Inc. is the leading manufacturer of dry-chemical and biological media and scrubbers that eliminate problematic gases in the water 

and wastewater industries. We are a worldwide single-source provider of engineered, media, filters, systems and corrosion monitoring 

instrumentation. As part of our committment to our ISO 9001:2008 quality management system, we perform rigerous quality assurance 

tests on all of our products. Purafil’s superior clean air products provide the following municipal solutions: 

• ODOR CONTROL: to eliminate odorous gases from sewage collection and processing operations. 

• TOXIC GAS SCRUBBING: to prevent accidental chemical releases at facilities storing hazardous quantities of toxic gases, 

specifically chlorine, sulfur dioxide and ammonia. 

• CORROSION CONTROL: to protect electronic equipment from premature failure due to corrosion. 

PURAFIL’S DRY-SCRUBBING MEDIA ADVANTAGE 

Purafil’s dry-scrubbing media is either bulk-filled within our engineered equipment 

or inside our MediaPAK modules or PuraGRID ® filters which are then inserted into 

the equipment. We offer a variety of patented dry-scrubbing granular media 

formulations to eliminate odorous, toxic, and corrosive gases. Our media permanently 

removes gases from the air through chemisorption. During this instantaneous process, 

gases are adsorbed, absorbed and captured throughout the entire volume of the 

media. The gases are then chemically transformed into harmless solids that remain 

trapped inside the media. Once the gases are removed from your environment, they 

cannot re-enter the airstream. 

As a complimentary service, we help you optimize your system’s performance by 

testing remaining media life. Our laboratory technicians analyze samples from your 

system(s) and provide a report indicating the necessary media replacement date 

based on specific conditions in your facility. 

Purafil also provides a patented biological mixed media which uses a natural biotrickling 

microbial process to remove odorous gases. Please see our biological section 

for more information on this advanced bio filtration technology. 

PURAFIL’S MUNICIPAL MEDIA 

MEDIA 

ODORCARB TM 

ULTRA 

DESCRIPTION 

Primary media for removal of hydrogen sulfide. Contains Media Life 

Indicator Pellets for a visual indication of remaining media life. 

LANDFILL-DISPOSABLE 

YES 

THE PURAFIL MEDIA ADVANTAGE 

BEST IN CLASS REMOVAL CAPACITY 

for Hydrogen Sulfide (H 2 S) 

ODORMIX TM 

SP 

Broad spectrum control of odors, including mercaptans, amines, 

aldehydes, organics and sulfur dioxide. 

YES 

UNMATCHED POLISHING CAPABILITY 

with 12% Impregnated Sodium Permanganate 

CSO TM 

Recommended for removal of chlorine and sulfur dioxide gases. 

YES 

THE ONLY AVAILABLE 

Alumina Based Media for Removal of 

Chlorine (Cl 2 ) and Sulfur Dioxide (SO 2 ) Gases 

CHLOROSORB ® ULTRA 

Removes chlorine gas; operates effectively in below freezing 

temperatures without special heaters. 

YES 

HIGHEST AVAILABLE IN THE INDUSTRY 

with 15% Minimum by Weight 

Chlorine Gas (Cl 2 ) Removable Capacity 

PURACARB ® AM 

Removes ammonia gas. 

YES 

THE ONE AND ONLY UL CERTIFIED 

media for ammonia (NH 3 ) removal.

ODOR APPLICATIONS 

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ODOR 

CONTROL 

PURAFIL ENGINEERED MEDIA SCRUBBERS 

Purafil’s engineered dry-media scrubbers offer several advantages compared to cometitive products. Our patented 

media formulations are manufactured using special chemicals, or impregnants, that react with odorous gases and 

remove them from the airstream. Known as chemisorption, this process converts odors to harmless salts. Once the 

gases are removed from the environment, they cannot re-enter the airstream. As a result, Purafil’s engineered 

media do not typically require special disposal precautions. 

Purafil’s engineered media perform well at all temperatures and levels of humidity, they are non-flammable, UL 

Classified and remove a broad range of odors. Our media are also life testable. Through laboratory analysis, Purafil 

can predict when media must be replaced which can help to prevent gas breakthrough and premature media 

disposal. Purafil offers a large selection of engineered media scrubbers to control odors in various municipal settings. 

DRUM SCRUBBER 

Installed in over 1,000 pump stations, lift stations, and wet wells. 

The Drum Scrubber is sized for airflows up to 1,000 cfm and is ideal for low to 

moderate contaminant load applications. The Drum Scrubber houses multiple layers 

of Purafil media (typically Odorcarb Ultra or Odormix SP) for complete odor 

control. 

Standard Features: 

• Linear, low-density polyethylene canister 

• Purafil ESD media volume by model: DS-100: 5 ft 3 ; DS-300: 10 ft 3 ; 

DS-500: 17 ft 3 , DS-1000: 39 ft 3 

• Integrated motor housing 

• TEFC motor 

• Aluminum blower assembly 

• Adjustable damper 

• Stainless steel and rubber latches 

• Stainless steel fasteners 

• Thermoplastic packing & FRP lid 

• Fernco flexible coupling at inlet 

• Airflows up to 1,000 cfm 

Optional Features: 

• Mist eliminator 

• Silencer 

• Explosion proof motor 

• Rain hood 

• Passive design 

• Differential pressure gage 

LOW AIRFLOW ODOR & CHLORINE CONTROL SCRUBBERS 

DRY-MEDIA SCRUBBERS 

CHLORINE DRUM SCRUBBER 

Used for changing cylinders less than 150 lbs for nuisance chlorine applications. 

The Chlorine Drum Scrubber is sized for airflows up to 500 cfm. This scrubber is 

bulk filled with Purafil’s patented Chlorosorb ® Ultra media which has the highest 

removal capacity available in the industry. 


• Fiberglass reinforced plastic (FRP) construction 

• Purafil ESD media volume by model: CDS-100: 5 ft 3 ; CDS-300: 10 ft 3 ; 

CDS-500: 17 ft 3 

• Integrated motor housing 

• TEFC motor 

• Aluminum blower assembly 

• Adjustable damper 

• Stainless steel and rubber latches 

• Stainless steel fasteners 

• CPV packing and FRP lid 

• Fernco flexible coupling at inlet 

• Airflows up to 500 cfm 


• Silencer 


• Casters for mobility 

• Passive design with top inlet 

MOLE MANHOLE 

SCRUBBER 

Used at street-level sewer 

manholes. 

Constructed of stainless steel, the 

MOLE TM Manhole Scrubber 

removes odors from street-level 

sewer manholes. Odors enter the 

MOLE through the bottom of the 

unit and flow upwards through two 

vertically stacked disposable 

modules containing Odormix SP 

media. 

PURAFIL VENT 

SCRUBBER 

Used at municipal vent pipes. 

Removal of odorous gases with a 

99.5+% gas removal efficiency 

up to 150 cfm. These inexpensive 

passive vent scrubbers are perfect 

for small vent applications and 

come standard with Purafil’s 

Odormix SP media which is 

designed to remove a broad 

spectrum of odorous gases 

including mercaptans, hydrocarbons, 

hydrogen sulfide and 

general sewer odors.

ODOR AND CORROSION APPLICATIONS 

MEDIUM TO LARGE AIRFLOW ODOR AND/OR CORROSION CONTROL 


TUB SCRUBBER SYSTEM 

Use at small headworks, large pump stations, in screening rooms, and at the discharge of biofilters. 

The Tub Scrubber System is sized for airflows from 500 to 4,000 cfm and is an economical solution for controlling sewage odors. 


• Full charge of media manufactured by Purafil 

• Three-foot media bed 

• Fiberglass construction 

• Easily accessible fill and clean-out ports 

• Externally mounted, enclosed blower system 

• Damper control air inlet 

• Mist eliminator/prefilter 


• Silencer 


• Exhaust stack 

DEEP BED SCRUBBER 

Use at small headworks, large pump stations, in screening rooms, and at the discharge of biofilters. 

The Deep Bed Scrubber is sized for airflows from 500 to 8,000 cfm and removes high concentrations of 

odors in wastewater operations. 


• Aluminum or stainless steel construction 

• Full charge of Purafil ESD media 

• Enclosed blower system 

• Skid mounted 

• Up to four media bed sections for multiple contaminant challenges 



• External FRP blower 

• Vacuum ports 


• Silencer 


PARALLEL BED SCRUBBER 

Use at large headworks and full treatment plants. 

Designed for airflows from 8,000 to 40,000 cfm, the parallel bed scrubber mitigates the highest 

contaminant loads. 



• Multiple parallel media beds 

• Aluminum or stainless steel construction 



• External FRP blower 

• Sound enclosure 


• Silencer 


VESSEL SCRUBBER 

Use at large headworks, full treatment plants, and large digesters. Designed for airflows from 8,000 to 20,000 

cfm, the Vessel Scrubber mitigates the highest contaminant loads. 

The Vessel Scrubber is constructed of FRP and contains several thousand pounds of Purafil ESD dry-scrubbing 

media. Odors are drawn into the scrubber and through the media bed, where contaminants are chemically 

removed. Clean air is discharged to the outdoors through a short vertical stack. Sample ports are easily accessible, 

and Purafil ESD offers complimentary media life analysis for as long as the system is in use. 


• Single- or dual-bed, fiberglass vessel 


• Media sampling ports on side and top of vessel 

• Externally mounted, belt driven, FRP blower section 



• Sound enclosure 

• Vacuum ports 

• Silencer 


• Exhaust stack

ADVANCED BIOLOGICAL ODOR CONTROL SYSTEM 

When two industry leaders join forces to combine bio and dry odor control 

technologies, you can expect the best odor abatement system on the 

market! Purafil’s new BIOLOGICAL AIR TREATER (BAT) features the most 

advanced proprietary biotrickling filter technology through an exclusive 

license with Honeywell Process Solutions. 

Combined industry-leading patented innovations provide: 

• Low Maintenance & Pressure Drop 

• Natural Bio-Trickling Microbial Process 

• Smaller Footprint versus Biofilters 

• Engineered Chemisorptive Polishing Media 

• Low Operating Costs with Long-lasting Media Life 

• Low Capital Costs with High Contaminant and Odor Removal 

• Ease of Operation with Stable Biofilms Resistant to Fluctuations 

• Unique Design with Patented Mixed-Media Support Prevents 

Plugging and Channeling 


LARGE AIRFLOW ODOR CONTROL 

BIOLOGICAL SCRUBBER 

EXCLUSIVE SCIENTIFIC ODOR CONTROL PARTNERSHIP REMOVES THE FOLLOWING TYPICAL POLLUTANTS: 

• Inorganics such as Hydrogen Sulfide and Ammonia 

• Organics such as Hydrocarbons 

• Sulfurics such as Mercaptans 

• Nitrogenous Compounds such as Trimethylamine and Amides 

and Nitriles 

• Oxygenated Alcohols, Aldehydes, Esters, Ethers, Ketones and 

Acids 

• Aromatics such as BTEX’s (Volatile Organic Compounds; 

Benzene, Toluene, Ethylbenzene, and Xylenes) and Styrenes 

• Aliphatics such as Butadiene and Hexane 

BAT TECHNOLOGY 

FEATURES: 

• High surface area mixed-media with 

great mass transfer and distribution 

• Layering mixed-media options for: 

- Bulk Removal Stage 

- Intermediate Stage 

- Polishing Stage 

• Uniform biofilms throughout bed 

• Shock-resistant and stable biofilms 

• Low cost construction materials 

• High loading and removal capacities 

• Adaptable for any microbial consortia


LARGE AIRFLOW ODOR CONTROL 

BIOLOGICAL SCRUBBER MEDIA 

BIOLOGICAL AIR TREATER MIXED-MEDIA 

The patented technologies within Purafil’s Biological Air Treater provides a more efficient and cost-effective odor abatement 

and VOC treatment than other biological removal systems. The innovative BAT media consists of proprietary blends of specially 

formulated polyurethane foam cubes and polypropylene spacers that are uniquely supported for the immobilized bio-catalysts, 

resulting in higher concentration and distribution of biofilm compared to conventional and alternative biotrickling filter systems. 

HONEYWELL’S PROPRIETARY MIXED-MEDIA PACKAGING 

The polyurethane foam cubes provide incredible surface area per unit volume to host microbial biofilms. Polypropylene 

spacers supply substantial void volume and structural integrity for tall beds, as well as enhanced mass transfer and excellent 

hydraulic dispersion and distribution. The unique mixed-media support allows for control of surface area and void space, 

with the result of reduced pressure drops across the deign bed. Ratios of foam-to-plastic vary with engineering design and 

application, and are used to control biofilm depth and pressure drop. BAT mixed-media beds can be used in biofilters to 

produce highly-efficient bulk removal, intermediate removal, and polishing zones. Purafil’s BAT biofilter & biotrickling filter 

technology is amenable for any biofiltration application. 

The polishing filtration in this high-tech system is Purafil’s proprietary Odormix SP dry media which has been specially engineered 

to provide the highest amount of permanganate (the active ingredient) for increased capacity and will not off-gas like carbon 

products. Odormix SP Media demonstrates a higher working capacity for broad-spectrum oxidation of contaminants in 

actual field conditions, where multiple gas challenges are present. 

PURAFIL’S BIOLOGICAL SCRUBBER VS.COMPETITORS’ WET CHEMICAL SCRUBBER 

The technology transfer and license of Honeywell’s patented biological odor controltechnology has provided additional capabilities to Purafil’s line of clean air product 

solutions. The Biological Air Treater (BAT) can be used for high airflow and concentrationlevels of hydrogen sulfide. The other typical competitive technology for this 

application are wet chemical scrubbers. When comparing these two technologies with an airflowof 10,500 cfm (17,850 m3/hr) and a hydrogen sulfide concentration 

of 143 ppm (200mg/m3) with standard temperature and pressure, the Purafil Biological Air Treater (BAT) is approximately $3.8 million less than a 

competitive wet chemical scrubber over a 20 year time period.

EMERGENCY GAS SCRUBBING APPLICATIONS 

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TOXIC GAS 

SCRUBBING 

DRY-SCRUBBING TECHNOLOGY 

Instead of using toxic liquid caustic to neutralize gases, the EGS uses dry-scrubbing media. These media have indefinite shelf life - if they’re 

not used, you don't need to replace them. Purafil manufactures three kinds of media specifically for the EGS: 

CSO to remove Cl 2 and SO 2 

CHLOROSORB ® ULTRA*to remove Cl 2 

PURACARB ® AM to remove NH 3 

Whether new or spent, all three media are: 

• non-toxic 

• non-hazardous 

• landfill disposable 

• UL Classified 

Because we manufacture our own media, we have quality control and can guarantee availability and fast 

delivery. We also offer value-added laboratory services to ensure optimal media and system performance. 

* Chlorosorb ® Ultra functions at -40° Fahrenheit 

PREVENTING TOXIC GAS RELEASES 

SMALL TO LARGE AIRFLOW TOXIC GAS CONTROL 


Facilities storing hazardous quantities of chlorine (Cl 2 ), sulfur dioxide (SO 2 ) or ammonia (NH 3 ) must invest in emergency standby 

equipment to prevent accidental chemical releases. 

PURAFIL EMERGENCY GAS SCRUBBER 

Purafil’s dry-chemical Emergency Gas Scrubber (EGS) is designed to remove the entire contents 

of a fully loaded Cl 2 /SO 2 /NH 3 cylinder in a worst-case release scenario. The EGS works with 

cylinders storing 150 pounds, 1 ton, 2 tons or 3 tons or more of Cl 2 /SO 2 /NH 3 and discharges 

less than 25 parts per billion. 

Purafil manufactures two designs of the EGS: 

1. Aluminum, multi-stage scrubber with horizontal airflow 

2. Fiberglass vessel with vertical airflow 

PURAFIL ALUMINUM EGS 

PURAFIL FIBERGLASS EGS 

DRY SCRUBBERS VERSUS WET SCRUBBERS 

Dry scrubbers have several advantages over conventional wet scrubbers. For instance, dry scrubbers require significantly 

less maintenance than wet scrubbers. They have just one moving part—a blower. No need to hassle with pumps, spray 

nozzles, or pH controls! 

Dry scrubbers are much safer, too. Instead of using toxic liquid caustic, they neutralize gases with non-toxic dry-scrubbing 

pellets. These pellets are called media, and they permanently transform gases into harmless solids. 

Unlike liquid caustic, dry-scrubbing media are immediately available for instantaneous reaction, regardless of the load 

rate. With wet scrubbers, you have to measure the amount of gas fed into the scrubber. 

Purafil’s dry emergency gas scrubber discharges less than 25 parts per billion, but wet scrubbers discharge 1-4 parts per 

million. Call Purafil to help you transform your caustic wet scrubber to a safe dry scrubber with our patented retrofit plan! 

PURAFIL’S PATENTED RETROFIT PLAN FOR 

WET TO DRY CONVERSION IS AS EASY AS 1, 2, 3! 

STEP 1: 

Remove Caustic Material 

Remove the three-panel lid. 

Drain and dispose of liquid caustic from reservoir and reaction chamber. 

Remove recirculation pump and pipe. 

STEP 2: 

Modify Existing Scrubber 

STEP 3: 

Install Purafil Chlorosorb ® Ultra Media 

Remove and dispose of tower packing material. 

Cut out internal fiberglass walls and barrier between reaction chamber and liquid reservoir. 

Install aluminum posts and secure to external fiberglass walls. 

Install perforated, aluminum media screens and secure to posts. 

Install Purafil ESD Chlorosorb Ultra Dry- Chemical Media between media screens. 

Replace three-panel lid and plug holes.

CORROSION APPLICATIONS 

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CORROSION 

CONTROL 

Monitoring air quality is an essential part of your corrosion control program. Purafil's OnGuard ® 3000 (OG3) Monitor protects 

your electronics by measuring in real time the level of corrosion in your facility and transmitting the readings to your SCADA 

system. With the OnGuard, you can log cumulative or incremental data to detect and measure isolated corrosioncausing 

events and potential effects on equipment reliability. 

The Purafil OG3 Monitor uses highly sensitive sensors to provide accurate and reliable corrosion monitoring within 

± 0.5-1% of full span. All measurements can be related to the International Society of Automation Standard 71.04- 

1985, which defines an environment as either G1, G2, G3, or GX based on the corrosion severity level and potential 

effects on equipment reliability. 

Ideal for control rooms, motor control centers, rack rooms, and other areas where corrosion is a concern, the 

OnGuard allows for action to be taken before problems develop. In turn, this prevention increases the reliability 

of electronic and electrical instrumentation and reduces the cost of maintenance repairs. 

Purafil’s OG3 can transmit real-time data to your SCADA system via a 4-20 mA output signal. In addition, the Purafil 

OG3 contains internal temperature and humidity sensors and can be battery-operated for data logging functionality. 

MEDIUM TO LARGE AIRFLOW CORROSION CONTROL 


PURAFIL SIDE ACCESS SYSTEM 

Protects HVAC System in Control Rooms 

500 - 40,000 CFM 

POSITIVE PRESSURIZATION UNIT AND 

CORROSIVE AIR UNIT 

Protects Control and Server Rooms 

500 - 4,000 CFM 

ELECTRONIC CABINET UNIT 

Protects Control Panels 

Less than 500 CFM 

CORROSION EQUIPMENT FILTRATION SOLUTIONS 

PuraGRID FILTER WITH THE GridBLOK TECHNOLOGY 

THE GridBLOK 

MEDIA 

TECHNOLOGY 

INSIDE 

THE PuraGRID FILTER 

Purafil now offers the PuraGRIDs within select engineered equipment as an 

alternative or in conjunction with modules. This revolutionary filter is 

designed to supply a large amount of chemical filtration media 

with minimal amount of pressure drop. The GridBLOK media 

technology inside the PuraGRID filter offers a 50% greater 

removal capacity than traditional carbon products. By 

utilizing this new filtration medium, you can reduce the size of 

new equipment while providing increased operational 

performance and energy savings. The performance of the 

GridBLOK’s monolithic structure-based system is comparable 

to, and in some cases superior to, traditional packed-bed 

media systems. Combine these media choices with low 

pressure drop, and performance characteristics and you 

now have a superior option for controlling gaseous 

contamination. The PuraGRID filter is now available in 

five Purafil patented media formulations to control 

odors, chlorine and corrosion. 

Pictured: Two half units which 

make up one whole module. 

POSI-TRACK TECHNOLOGY 

MEDIAPAK MODULES 

Purafil’s dry-scrubbing media is either bulk-filled within our 

engineered equipment or inside our MediaPAK modules or 

PuraGRID filters which are then inserted into the equipment. 

MediaPAK modules are filled with your choice of Purafil drychemical 

media, which is non-toxic and non-hazardous as 

supplied. 

MediaPAK modules features Purafil’s Posi-Track self-sealing technology 

which incorporates slanted tracking to support the modules via a 

corresponding angled notch in the modules’ frame. The weight of the module 

forces it against the channel and creates a positive seal with the tracking, 

virtually preventing air bypass and increasing system efficiency. 

Purafil.Inc @Purafil Purafil.Inc 

Purafil, Inc. • 2654 Weaver Way, Doraville, Georgia, 30340, U.S.A. • www.purafil.com • tel: (770) 662-8545 • (800) 222-6367 

© Purafil 2012 VMB-WW-03 

ISO 9001:2008

Municipal (Water-Wastewater) Facilities - Purafil

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