WP theme optional pages:

Technologies

Biofilters

Biofilters

Biofilters are an odor treatment technology that utilizes biological processes as the treatment mechanism. Biofiltration is considered a “green” approach to odor control, because it utilizes microorganisms in media to oxidize odor and air emission compounds to carbon dioxide, water, biomass, and other benign by-products such as chloride and sulfate. The by-products are emitted in the outlet air, drained from the biofilter, or consumed by the microorganisms. The biological activity in a biofilter is similar to the activities performed by the microorganisms in activated-sludge secondary wastewater treatment processes.

read more

Biotrickling Scrubbers

Biotrickling Scrubbers

Biotrickling Scrubbers are an odor treatment technology that utilizes biological processes, as opposed to chemical processes as their treatment mechanisms. They are similar to biofilters in this regard. Biotrickling scrubbers use artificial media and closed vessel construction, where biofilters often use natural media and open bed construction.

read more

Nitrates

Nitrates

Nitrate solutions are typically fed at pumping stations to control sulfide formation in force mains, where anaerobic conditions may occur because oxygen transfer to the wastewater is limited. Feeding nitrate solutions to control sulfide formation and release is the most common form of chemical treatment in collection systems.

read more

Magnesium Hydroxide Addition

Magnesium Hydroxide Addition

Magnesium hydroxide (Mg(OH)2) is a chemical treatment for wastewater, used for hydrogen sulfide (H2S) control in wastewater collection systems and at treatment plant headworks processes. Magnesium hydroxide is an alkali source that works by increasing the pH of the treated wastewater. The chemical is typically added to the wastewater as a slurry at a collection system pump station or at an injection point immediately upstream from a pump station.

read more

Iron Salts Addition

Iron Salts Addition

Iron Salts are a chemical treatment for wastewater, often added to wastewater collection systems upstream from treatment plant influents to control hydrogen sulfide emissions. Iron Salts include Ferrous Chloride, Ferrous Sulfate and Ferric Chloride. Iron Salts are precipitants that oxidize and precipitate dissolved sulfides in wastewater to form iron sulfides. The iron sulfides are insoluble and cannot be stripped from the wastewater.

read more

Hydrogen Peroxide Addition

Hydrogen Peroxide Addition

Hydrogen peroxide (H2O2) is a powerful oxidant that oxidizes hydrogen sulfide (H2S), with byproducts of sulfur, water and oxygen. Hydrogen peroxide is commonly injected into a wastewater stream (force main, gravity sewer) to control H2S and other odorous compounds associated with wastewater collection and treatment. It is often injected just upstream of wastewater treatment facilities to minimize emissions at the headworks and primary clarification processes. The chemical may also supplement dissolved oxygen levels in the wastewater to prevent additional formation of hydrogen sulfide.

read more

Carbon Adsorption

Carbon Adsorption

Activated carbon has a complex pore structure with a very large surface area. Odorous compounds are transferred from the air being treated to the surface of the carbon as the air is forced through the carbon bed. There is a physical attraction between the compound and the carbon once contact is made which causes a bonding. The compounds will continue to adsorb onto the surface of the carbon until all of the pore space in the carbon is used up.

read more

Thermal Oxidation

Thermal Oxidation

Thermal oxidation destroys odorous compounds and/or volatile organic compounds (VOC’s) in the air by heating it to about 1,400°F. The process works by subjecting the odorous air stream to the high temperatures in the presence of oxygen long enough to oxidize the odorous compounds. The process requires sufficient concentrations of combustible reactants in the air stream to sustain the combustion process in the thermal oxidation unit.

read more

Activated Sludge Diffusion

Activated Sludge Diffusion

Activated sludge diffusion is a relatively common technology that involves collecting odorous air, directing it to the suction side of aeration blowers, and diffusing it into activated sludge basins. The odors are removed by a combination of mechanisms including absorption, adsorption, condensation, and biological oxidation in the basins.

read more

Chemical Scrubbers

Chemical Scrubbers

Chemical scrubbers are a common odor control technology. The basic objective of a scrubber is to provide contact between odorous air, water, and chemicals to provide oxidation or entrainment of the odorous compounds. The odorous compounds are absorbed into the scrubber liquid, where they are oxidized and/or removed from the scrubber as an overflow or blowdown stream.

read more

UV Oxidation

UV Oxidation

The UV – Oxidation process is a new odor control technology in the wastewater treatment plant industry, although it has a successful history in removing volatile organic compounds (VOC’s) from air in other industrial applications (primarily aircraft industry paint booths).

read more

Oxygen Ionization

Oxygen Ionization

The attached picture shows a typical oxygen ionization system installation. The modular ionization units are installed in the supply air ductwork. Ion tubes in the ionization units generate a high voltage electrical discharge that strips ions from oxygen. Both negative and positive ions are formed. These ions are very small and create oxygen clusters. These ionized oxygen clusters attract and react with the odorous molecules in the air.

read more

Ozone and Hydroxyl Ion

Ozone and Hydroxyl Ion

The Ozone (O3) & Hydroxyl Ion (OH) System utilizes continuously generated ozone, make up air and water that are dispersed through an atomizing nozzle to create a fine water mist (or fog) of absorbed ozone with resulting hydroxyl ion in the mist. The mist is typically sprayed into an enclosed structure, such as a covered wet well, to react with H2S and other odorous compounds in the structure headspace for odor control purposes. The structure functions as the reaction chamber.

read more

Covers and Enclosures

Covers and Enclosures

Odor control often requires the use of covers or enclosures to collect and contain the odors prior to treatment and dispersion. The major objectives of good containment design include:
– Prevent escape of odorous gasses to atmosphere
– Minimize volumes of odorous air to be treated
– Allow for reasonable access to covered processes for inspection and maintenance
– Ensure worker safety

read more

Oxygen Injection

Oxygen Injection

Oxygen injection is a chemical treatment for wastewater, used for the prevention of hydrogen sulfide formation and/or oxidation of sulfides in the wastewater. The process is similar to the nitrate addition process, except that dissolved oxygen is the oxidizing agent instead of nitrate. The oxygen injection process involves adding dissolved oxygen into a force main at a pumping station.

read more

Webster Environmental Associates, Inc.

13121 Eastpoint Park Blvd #E
Louisville, KY 40223

Office: (502) 354-4002

Fax: (502) 253-3442