A biological filter is a mechanism through which waste water is filtered using a feed material coated with a biological film formed by microorganisms. This feed material fills the biofilter capacity - Bioreactor. There are different types of biofilters with different types of loading (crushed stone, expanded clay, various plastics).
The most common type of biofilter with a floating material is made of high-purity polyethylene.
MBBR has a large working surface of 100-1000 m2 / m3 for the life of bacteria, and has a small cost, which makes it more accessible. The practicality of the material makes it possible to successfully use this material for up to 10 years.
Biological purification of water is a natural process, as it is due to the formed bacteria that decompose waste. This type of cleaning does not require reagents, a large number of technical personnel and does not require an increase in the cost of electricity. Thanks to this method, it is realistic to achieve a very high level of water purification. Moreover, in comparison with other methods of purification, biological - is cheaper than any other.
Both aerobic and anaerobic microorganisms can be used.
Aerobic colonies of microorganisms develop in an environment saturated with oxygen, and anaerobic on the contrary.
The most popular type of biological treatment is biofilters. Particularly widespread were the Installations of Closed Water Treatment, abbreviated RAS or so-called recirculation aquaculture systems. Bio-loading is a filler for biofilter, made of high-quality polyethylene.
The transformation of various ammonium compounds into nitrites, and then into nitrates.
Reduction of chemical (COD) and biological (BOD) oxygen consumption.
The main idea is a bioreactor with a weighted loading layer.
Technical characteristics and cost: