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Difference between revisions of "Biofilters"
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[[Category:Filtration]]{{Knoppen}} | [[Category:Filtration]]{{Knoppen}} | ||
[[File:Biofilters_03.jpg|thumb|right|Biofilter plant]] | [[File:Biofilters_03.jpg|thumb|right|Biofilter plant]] | ||
[[File:Biofilters_02.gif|thumb|right|Biofilter system]] | [[File:Biofilters_02.gif|thumb|right|Biofilter system]] | ||
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Examples of biofiltration include; | Examples of biofiltration include; | ||
* Biostrips, Biobags, Bioscrubbers, and Trickling filters | |||
* Wetlands and Natural wetlands | |||
* Slow sand filters | |||
* Treatment ponds | |||
* Green belts | |||
* Living walls | |||
* Riparian zones, Riparian forests, Bosques | |||
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==Use in aquaculture== | ==Use in aquaculture== | ||
The use of biofilters are commonly used on closed aquaculture systems, such as recirculating aquaculture systems (RAS). Many designs are used, with different benefits and drawbacks, however the function is the same: reducing water exchanges by converting ammonia to nitrate. Ammonia (NH4+ and NH3) originates from the brachial excretion from the gills of aquatic animals and from the decomposition of organic matter. As ammonia-N is highly toxic, this is converted to a less toxic form of nitrite (by <i>Nitrosomonas</i> sp.) and then to an even less toxic form of nitrate (by <i>Nitrobacter</i> sp.). This "nitrification" process requires oxygen (aerobic conditions), without which the biofilter can crash. Furthermore, as this nitrification cycle produces H+, the pH can decrease which necessitates the use of buffers such as lime. | The use of biofilters are commonly used on closed aquaculture systems, such as recirculating aquaculture systems (RAS). Many designs are used, with different benefits and drawbacks, however the function is the same: reducing water exchanges by converting ammonia to nitrate. Ammonia (NH4+ and NH3) originates from the brachial excretion from the gills of aquatic animals and from the decomposition of organic matter. As ammonia-N is highly toxic, this is converted to a less toxic form of nitrite (by <i>Nitrosomonas</i> sp.) and then to an even less toxic form of nitrate (by <i>Nitrobacter</i> sp.). This "nitrification" process requires oxygen (aerobic conditions), without which the biofilter can crash. Furthermore, as this nitrification cycle produces H+, the pH can decrease which necessitates the use of buffers such as lime. | ||