ODOR CONTROL TECHNOLOGY BIOdor™

Odor control is one of the primary concerns of large-scale composting facilities, especially those located near residential areas. While good process management and careful housekeeping can greatly reduce odors, in many cases some method of odor treatment will still be required. There are several options for odor treatment, including chemical stripping, thermal destruction, and biofiltration.
Biotech technologies are specialized in designing and building an odor control system for small, medium and large facilities, we help to investigate the pollutants sources and ventilation systems, controlling the harmful chemicals using effective treatment, and to maintain the air quality level to be safe to the people and to the environment.

 

ODOR CONTROL SCRUPPER

Biotech technologies has designed Dual stage scrubber to control odor. The first stage is wet scrubbing using scrubbing solution and the second stage is dry scrubbing using activated carbon. The system has dual tower design, with packing depth determined by odor composition and efficiency required. This engineering concept is the most efficient due to counter flow operation.

Biotech offers the most complete and comprehensive line of innovative wet scrubbers to solve practically all gaseous, solid/liquid particulate, odor and product recovery requirements.

Depending on the type of gas contaminant whether it be a solid, liquid, odor or recovery a variety of collection mechanisms and scrubbing liquid types are used.
● For gaseous contaminants, mass transfer is the mechanism that absorbs the gas into a liquid through creation of liquid films or droplets. A chemical reagent scrubbing liquid is incorporated in many cases to enhance the removal of contaminants by producing a stable salt by-product.
● For particulate collection, impaction between particles and liquid droplets aided in many cases by sophisticated agglomeration mechanisms are used to remove both micron and submicron particles at extremely high efficiencies to meet PM 2.5 and stricter standards.

Vertical Packed Bed Scrubbers

In the vertical counter-current design, gas flows upward while scrubbing liquid flows down through banks of sprays. The absorption of gases takes place in the scrubber random packing section and scrubbing liquid is introduced into a liquid through or spray distribution system. A high-efficiency mist eliminator removes entrained liquids. Clean gas exists at the top of the vessel.

 

 

Applications
  • Sulfur dioxide (SO2) scrubbing
  • Hydrogen Sulphide (H2S) Scrubbing
  • Hydrochloric acid vapor (HCI) scrubbing
  • Chlorine (Cl2) gas scrubbing
  • Nitric Acid (HNO3) Fume scrubbing
  • Ammonia (NH3) scrubbing
  • Solvent vapor scrubbing
  • Methanol (CH3OH) vapor scrubbing
  • Ethylene oxide scrubbing
  • NOx Scrubbing system
  • Boiler Exhaust flue gas scrubbing
The chemical compounds causing odor

The odor that is detected from a dairy operation is a complex mixture of gases. Most often the odor is a result of the uncontrolled anaerobic decomposition of manure. However, feed spoilage can also contribute to the odor. The odor that our noses detect can be a combination of 60 to 150 different compounds. Some of the most important types of odor causing compounds are volatile fatty acids, mercaptans, esters, carbonyls, aldehydes, alcohols, ammonia, and amines.
Ammonia can create strong odors near the manure storage or building, but is not a significant component of odor downwind from a dairy facility. Ammonia is highly volatile and moves upward in the atmosphere quickly where it is dilute

Biofilter construction
  • A biofilter uses moist organic materials to adsorb and then biologically degrade odorous compounds.
  • Cooled and humidified compost process air is typically injected through a grid of perforated pipes into a bed of filtration media.
  • The materials that have been used for biofilter construction include compost, soil, peat, chipped brush and bark, sometimes blended with a biologically inert material such as gravel to maintain adequate porosity.
  • Biofilter bed depths typically range from 1 to 1.5 meters deep, with shallower beds subject to short-circuiting of gas flow and deeper beds more difficult to keep uniformly moist.
  • Biofilters have been shown to be effective at treating essentially all of the odors associated with composting, including ammonia and a wide range of volatile organic compounds (including sulfur compounds and amines).
CO2 and H2S Stripping Tower

the removal of carbon dioxide from water. Carbon dioxide, along with nitrogen and oxygen, comprise the majority of atmospheric gases. Water contains these gases in solution, following Henry’s Law of gas solubility that defines a proportional relationship between the amount of a gas in a solution and its partial pressure in the atmosphere.
The pH of the water affects equilibrium between bicarbonate ions and carbon dioxide. At a pH below approximately 4.5, all of the carbon dioxide dissolved in the water is present as a gas. At a pH of about 8.5, all the carbon dioxide is ionized. For this reason, decarbonation by air stripping is only effective at low pH with the pH reduction resulting from prior process or acid addition

Safety 


Agitation of liquid manure storages during pumping is recommended to prevent a buildup of solids and to increase the value of the nutrients applied to the land. However, agitation of pits under buildings occupied by animals or humans can be fatal because of the release of gases that are either toxic or capable of displacing the oxygen in the building. The gases of major concern are hydrogen sulfide (H2S), ammonia (NH3), carbon dioxide (CO2) and methane (CH4). Hydrogen sulfide is the most toxic of these gases. Like carbon dioxide, it is heavier than air and can displace the oxygen in the building. Methane is explosive at mixtures between 5 and 15 percent. To prevent loss of life, animals and workers should not be in the building during pit agitation.
Because of the risk of exposure to noxious gases, avoid entering a manure pit if possible. Carbon dioxide and hydrogen sulfide tend to accumulate above the liquid in the pit and may fill an empty pit. If you must enter the pit, ventilate it with fresh air before entering and wear a harness with a lifeline to outside helpers who can pull you out if you are overcome by the gases.

Biotech Technologies helps customers achieve compliance and condition biogas for end use. Whether for agricultural biogas, landfill gas, wastewater or other biogas projects, our proven, high-performance technology provides superior hydrogen sulfide (H2S) removal and odor control solutions.
Biotech as a leading provider of odor control system offers customers cost-effective, long-term solutions that deliver optimized performance and ease-of-use.