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odor control filter Applications

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    Odor Control for Liquid Waste

    Vaporize Odors Associated With Liquid Waste Processing

    Liquid waste, such as fats, oils and grease (F.O.G.) can emit unpleasant odors, which become even more pronounced in various stages of processing. Malodorous F.O.G. from restaurants are often transported by truck to F.O.G. filtering facilities and then to plants where they are processed into useable byproducts.

    By OMI Industries (OMI) based in Long Grove, ILLINOIS (USA).

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    Odor control for the poultry feed production

    The animal feed industry has its roots in the way traditional millers grinded the grains centuries ago, using (wooden) windmills. Nowadays feed is produced for chickens and other poultry, as well as for cattle, pigs and horses. There is a wide variety of feed and grains produced, with different raw materials (nutrients) applied in several compositions.

    In this modern era electric driven pellet mills are applied and grains are cooled mainly in counterflow coolers. To remove dust from the used cooling air usually a baghouse filter is being used which can meet the current severe dust emission standards. After this the air eventually will be blown outside. Especially the cooling air of poultry feed and pig feed production should be deodorized to prevent complaints.

    A factory usually has multiple pellet lines in service with about 15,000 to 25,000 m3/h of cooling air per line. Aerox has developed specific solutions for this industry.

    On the one hand a compact Aerox®-Injector can be installed per pellet line. On the other hand, airflows of different production lines can be joined together and can be treated with one compact Aerox®-Injector. In practice, this can be added up to 4 lines with a total airflow of up to 90,000 m3/h.

    Since the Aerox®-Injector can run on different capacities unnecessary power consumption is prevented when not all pellet lines are in service. This benefits the environment and reduces operational costs.

    By Aerox B.V. based in Vleuten, NETHERLANDS.

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    Waste water treatment plants Personnel Safety & H2S filter management

    Context & Challenges Globally, the wastewater treatment is the first public health issue. Urban development leads to urbanization near waste water treatment plant and extension of sewerage network. These aspects induce to an augmentation of sulfur compounds (H2S, mercaptans and sulfides) which are very corrosive, odorant and toxic. To monitor this compounds online CHROMATOTEC® offers high meteorological solutions. As a result of the confinement of the waste water stations, toxic components such as H2S and Methylmercaptan increased. Safety of employees on such working sites has therefore become of major problem. To fight this hazardous pollution, air filtering systems have been installed. For the station managers, personal safety coupled with the need for constant air quality control and filter change has been a heavy task.

    By Chromatotec Group based in Val de Virvée, FRANCE.

  • Sulfide Oxidation with Hydrogen Peroxide (H2O2)

    Sulfide Odor Control Sulfide is found throughout the environment as a result of both natural and industrial processes. Most sulfide found in nature was produced biologically (under anaerobic conditions) and occurs as free hydrogen sulfide (H2S) - characterized by its rotten egg odor. We are most likely to encounter biogenic H2S in sour groundwaters, swamps and marshes, natural gas deposits, and sewage collection/treatment systems. Manmade sources of H2S typically occur as a result of natural materials containing sulfur (e.g., coal, gas and oil) being refined into industrial products. For a variety of reasons - aesthetics (odor control), health (toxicity), ecological (oxygen depletion in receiving waters), and economic (corrosion of equipment and infrastructure) - sulfide laden wastewaters must be handled carefully and remediated before they can be released to the environment. Typical discharge limits for sulfide are < 1 mg/L. Sulfide Treatment Alternatives There are dozens of alternatives for treating sulfide laden waters, ranging from simple air stripping (for the low levels present in groundwaters) to elaborate sulfur recovery plants (used to treat several tons per day at refineries and coal burning power plants). There are processes based on biology (using compost filters, scrubbing media, or inhibition/disinfection), chemistry (oxidation, precipitation, absorption, and combination), and physics (adsorption, volatilization, and incineration). Each process occupies a niche which is often defined by the scale and continuity of treatment, whether the sulfide is in solution or is a gas, the concentration of sulfide involved, and the disposition of the sulfide containing medium. However, for reasons relating to convenience and flexibility, chemical oxidation (using hydrogen peroxide) continues to grow in its scope of application. Treatment with Hydrogen Peroxide While other peroxygens such as permonosulfuric (Caro’s) acid, peracetic acid, and persulfates will oxidize sulfide, their use for this application is overkill. Hydrogen peroxide (H2O2) is considerably simpler and more cost-effective. H2O2 may control sulfides in two ways, depending on the application: Prevention - by providing dissolved oxygen which inhibits the septic conditions which lead to biological sulfide formation; and Destruction - by oxidizing sulfide to elemental sulfur or sulfate ion.

    By USP Technologies based in Atlanta, GEORGIA (US) (USA).

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