SHARON (biotechnology)

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SHARON (single reactor system for high ammonia removal over nitrite process) - a biological technology for the conversion of ammonium nitrite to nitrite used in wastewater treatment plants.

SHARON technology uses varying rates of growth between nitrosobacteria that oxidize ammonium ions to nitrites, and nitrites, which oxidize nitrites to nitrates. It is run in a single bioreactor with aeration, without recycling biomass, at pH ≈ 7 and at 35 ° C. At this temperature, the rate of growth of nitrosobacteria is twice as high as that of nitrobacterium, which is eluted at a sufficiently short time of sewage retention and the oxidation of ammonium nitrite into nitrite is possible in the bioreactor.

From a two-year study in a 10-liter continuous stirred tank reactor, continuous aeration and a 24 hour wastewater retention time, 53% of ammonia was converted to nitrite only. SHARON requires four times the amount of aeration required than the traditional nitrification method to nitrate with simultaneous denitrification and does not require the addition of organic carbon required for denitrification bacteria. Bibliography

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