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BioFiltration, BioOxidization & BioScrubbing

Gulf Coast Environmental Systems has dozens of options for sustainable pollution control. Included in this is Biofiltration, a process to purify air and water biologically with the aid of micro-organisms, specifically bacteria.

What is Industrial Biofiltration?

Biofiltration is the process of utilizing natural biological oxidation for the destruction and removal of VOCs, odors and hydrocarbons. Simply put, biofiltration is the degradation of organic and inorganic substances by microorganisms. The air flows through what is called a packed bed of media causing the pollutants to transfer into a thin biofilm on the surface of the packed media. The microorganisms are housed in the microfilm and degrade the pollutants.

A biofiltration system requires minimal maintenance as the media can often last for many years. With synthetic media materials lasting up to 10 years and natural materials lasting an average of 2 to 5 years. The most common natural media materials include peat, vegetable mulch, bark or wood chips. These medias can usually be disposed of in a landfill or spread onto larger land areas when the material is replaced. Other options for material disposal can serve as an additional revenue stream. More information on media disposal can be found in this article.

The most common uses of biofiltration, bioscrubbers and biooxidizers include in the processing of waste water, capture of VOCs in surface runoff and microbiotic oxidization of air contaminants. Biofiltration is specifically used to treat:biofiltration_diagram

  • Acetone
  • Aliphatric Hydrocarbons
  • Ammonia
  • Anthranilates
  • Aromatic Hydrocarbons
  • Butadien
  • Carbon Disulfide
  • Esters
  • Ethanol
  • Formaldehyde
  • Heptane
  • Hexane
  • Hydrogen Sulfide
  • Isopropanol
  • Isopropyl acetate
  • Ketones
  • Methyl Ethel Ketone (MEK)
  • Methanol
  • n-Propanol
  • N-Propoyl Acetate
  • Pesticides
  • Phenol
  • Pinenes
  • Styrene
  • Terpenese
  • VM&P Naphtha

The Biofiltration Process

In biofiltration, bioscrubbing and biooxidization the biofilter is a bed microorganism filled media. These microorganisms attach themselves and grow to form the biofilm, a biological layer. The biofilm contains a community of various microorganisms including bacteria, fungi, yeast, macro-organisms such as protozoa, worms, insect’s larvae, etc., as well as extracellular polymeric substances (ESP). The texture of the biofilm is often described as slimy and muddy.

The three phases of biofiltration include:

  1. The solid phase (media)
  2. The liquid phase (water)
  3. A gaseous phase (air)
During the biofiltration water is applied intermittently or continuously over the media. Organic matter and the components of water diffuse into the biofilm where the treatment occurs during the biodegradation process. This is an aerobic process which means the microorganisms require oxygen for metabolism to occur. Oxygen is either supplied or enters the biofilter as water passes through. Microorganism activity is important to the process performance. The factors that are most integral to the process include biofilter hydraulic loading, the type of media, the feeding strategy (options include percolation or submerged media), the age of the biofilm, temperature, aeration, etc.
Advantages
While biological filters have a simple superficial structure. their internal hydrodynamics and microorganisms’ are complex in their biology. These features allow the process to have a high capability in maintaining their performance and rapidly return to initial levels following a period of low use, no use, intense use, toxic shocks, and media backwash, which is a high rate of biofiltration processes. Additional advantages include:
  • Because microorganisms are retained within the biofilm, biofiltration allows the development of microorganisms with relatively low specific growth rates
  • Biofilters are less subject to changes such as hydraulic shock and variable or intermittent loading
  • Operational costs are usually lower than option such as activated sludge
  • Final treatment result is less influenced by biomass separation since the biomass concentration at the effluent is much lower than for suspended biomass processes;
  • Attached biomass becomes more specialized at a given point in the process train as a result of the lack of biomass return

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Gulf Coast Environmental Systems (GCES) es el proveedor de soluciones personalizadas para sistemas de control de la contaminación, hornos industriales, ingeniería de sistemas y apoyo sobre el terreno en todo el mundo. Nuestro enfoque es analizar sus objetivos de negocio y flujo de procesos para proponer una solución ideal para ayudarle a optimizar estos objetivos. GCES proporcionamos servicios de ingeniería, fabricación, instalación, puesta en servicio y soporte continuo. Con nuestra amplia base de conocimientos y la gran base instalada mundial, estamos bien posicionados para resolver sus problemas de control de la contaminación.

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