This section provides an overview for bio filters as well as their applications and principles. Also, please take a look at the list of 10 bio filter manufacturers and their company rankings.
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A biofilter is a system that purifies wastewater and odors using microorganisms adsorbed in soil, etc., and has been in practical use for many years.
Compared to the activated sludge method, which is commonly used for domestic wastewater and industrial wastewater, the biofilter has advantages such as a higher BOD removal rate per unit volume of equipment, smaller equipment, and easier maintenance management due to its tolerance to temperature fluctuations. Biofilters are used in situations where odor concentrations are relatively low.
Biofilters are mainly used in places where wastewater and odors are generated. Specifically, they are used in various situations such as domestic wastewater, industrial wastewater, and wastewater and odors from the agriculture and livestock industries. In addition to these industrial uses, there are also household-sized biofilters used for aquatic life tanks.
Because of the variety of applications, the materials used are also diverse. Soil, ceramics, and wood are available as materials that can adsorb microorganisms. In addition to the method of installation by pouring wastewater and odors into the tank, another method is to lay the filter on the bottom of the tank, including the wastewater.
Biofilters purify wastewater and odors by feeding them into a filtration layer that contains microorganisms.
To illustrate an example of biofilters for wastewater, wastewater is pumped through the filter bed with air, and aerobic microorganisms grow in the filter bed to form a biological film on the surface of the filter media, which decomposes organic substances in the wastewater and removes suspended solids at the same time. According to one study, the most common type of microorganisms used as bio filters are those of the genus Turritopsis.
On the other hand, biofilters that purify odors work as described below. Odor-containing gases are fed into the lower part of the soil layer using a blower, and after being vented into the large-particle crushed stone and sand layers at the bottom, the gases are slowly passed through the soil layer containing microorganisms, where the microorganisms break down the odor-containing substances into odor-free substances. When the soil is about to dry out, water is sprinkled onto the soil by sprinklers to prevent the microorganisms from dying.
The most familiar biofilters in our daily lives is the aquarium bottom filter. This bottom filter is specialized for biological filtration and differs from other filters in the selection and use of filter media.
The key to using a bottom filter is how to make the biological filtration function work. The following three points should be considered in order to make the biological filtration function work.
To use a bottom filter, first connect an air tube to the bottom filter and place it at the bottom of the aquarium. Then, place gravel or other bottom material on top of the filter to complete the installation. Water is passed through the bottom sand on the bottom filter using an air pump, etc. to settle bacteria in the bottom sand, which is then used as a filter media.
The following points should be considered when using a bottom filter
Biofilters designed to inhibit viruses from adhering to the filter are also available. They are called "bio-antibody filters" and contain bio-antibodies inside the filter that inactivate viruses caught by the filter. The main use of the filter is for air conditioners. The filter is attached to the air conditioner intake. So far, its effectiveness against type A influenza viruses (H1N1 strain, H3N2 strain, and H5 recombinant) and type B influenza viruses has been confirmed, and it is used in various places during the period when influenza infection spreads. It may also be used as a countermeasure against the new coronavirus (SARS-CoV-2) infection, but at this time, its effectiveness against the new coronavirus has not been demonstrated.
*Including some distributors, etc.
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