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| DFM Denitrification Filter Media | buy or view price |
| DFM is a 99% pure sulphur compressed pellet measuring approximately 4mm in diameter by 2mm. Autotrophic bacteria such as Thiobacillus denitrificans and Thiomicrospira denitrificans are capable of reducing nitrate to nitrogen gas. The energy source of autotrophic denitrifying microorganisms is derived from oxidation-reduction reactions with elements such as hydrogen or sulphur as the electron donor. Autotrophic denitrifiers utilise inorganic carbon compounds (such as CO2, HCO3-) as their carbon source. The system therefore requires a buffer and Magphlow Media is ideal for this application. In contrast, no organic carbon is needed as in heterotrophic denitrification. Another advantage of autotrophic denitrificans is that reproduction rate is low resulting in less sludge production which minimises the handling processes. Autotrophic denitrification has been divided into hydrogen-based and sulphur-based processes. Autotrophic organisms such as Micrococcus denitrificans are capable of reducing nitrate to nitrogen while oxidising hydrogen to water. 55S + 50NO3- + 38H2O + 20CO2 + 4NH+4 ----> 4C5H7O2N + 25N2 + 55SO4-2 + 64H+Based on this equation, for each gram of NO 3-N removed approximately 0.64 g cells and 2.5 g of SO42- are generated the following buffering capacity will be consumed.
It is therefore important to sufficient buffering in the system, and a 50:50 ration of DFM and MagPhlow works well for the application. Phosphate is also consumed in the process and will limit the rate of denitrification, so additional phosphate may be required. This can be dosed into the water either continuously or as a batch process. The reactions are anaerobic, so the flowrates need to be slow. |
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