Odor control systems are used to prevent bad odors and corrosive environment. The main odor source constituent in wastewater is hydrogen sulfide that produces rotten egg odor and together with humid atmosphere produces sulfuric acid that attacks concrete, electric panels, and metals and corrode it.
Etaniv offers treating Odors using biological systems, dry scrubbers, and Ionization systems to oxidize the sulfur, ammonia and VOC’s compounds thereby neutralize it. We design and construct our systems to comply with the highest standards. We provide process design and detailed design in the most advanced CAD program and manufacture complete systems including treatment units, ductwork, fans and control systems. The following describes the technologies we use for the various applications:
An ion is an atom or molecule that carries a positive or negative electric charge as a result of having lost or gained one or more electrons. Ionization is the process by which this happens. It is useful in air purification because charged air atoms and molecules (ions) act effectively against odors and airborne contaminants.
Applying a high voltage to use a dielectric discharge tube produces an electric field and excites the air molecules passing over the surface. Ions, including activated oxygen atoms and hydroxyl radicals, are formed.
Using an alternating voltage, both positive and negative ions are produced. This has a big advantage over single ion polarity systems. As ions dispersing around the room they latch on to contaminant particles or molecules. The ions attach to odour molecules, thereby oxidizing it to a non-harmful and non-odorous compound. Those with opposite charges are attracted to each other. This creates larger particle clusters. The air is cleared as these clusters become heavy and fall to the ground, where they can be removed via routine vacuuming or mopping.
The ions also destroy bacteria and viruses by puncturing holes in the cell membranes.
Uses of ionizers:
Air ionizers are being integrated within an Air Handling Unit (AHU) of Odour control systems and are used to sanitize and de-odorize air in spaces such as:
- sewage plants
- Sewage pump stations
- HVAC systems to sanitize and de-odorize very large public spaces
- Industrial manufacture rooms.
- Garbage room
- Public toilets
Etaniv is specializing in design and manufacture of ionization systems to comply with the environmental agencies requirements.
- Biological filters
Controlling hydrogen sulfide and other odor emissions is a major issue for most wastewater treatment plants. Using microorganisms to remove odor or volatile organic compounds from air streams is not a new idea. Biofiltration has been used for many years. For H2S odor control, the key is to provide an ideal habitat for the growth of sulfide-oxidizing bacteria, to the exclusion of competing microbes which normally predominate in aerobic treatment processes. Several species of microorganisms can oxidize hydrogen sulfide to form odorless sulfuric acid. A few species of the genus Thiobacillus are capable of oxidizing H2S at low pH. Thiobacillus thiooxidans, in particular, thrives at pH <3, and its growth is not inhibited until the pH falls below 1.3.
Etaniv is specializing in design and manufacture of biotrickling filters and biofilters for the removal of H2S from wastewater treatment plants.
- Activated carbon
For the purification of air and gases, we mostly use extruded (pressed pellets) or coarse granular activated carbon. Typical applications for gases and water are:
- Removal of volatile organic compounds (VOC) and hydrocarbons
- Paint booth
- Storage tank ventilation
- Dry cleaning
- Solvent recovery
- Odour control
- Groundwater remediation (air strippers, venting, tent ventilation)
- Air conditioning units and cooker hoods
- Purification of process gases: Siloxanes and hydrogensulphide (H2S) removal from biogas, Landfill gas
To further improve the action of activated carbon for air purification we can impregnate the activated carbon with chemicals. This results in chemisorption, which reinforces the adsorption.
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