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Biological phosphorous and nitrogen removal (BNR) from municipal and industrial waste waters now became popular technology. It is cost-effective and environmentally friendly method to reduce phosphorous, nitrogen and organic discharge. BNR one of the best ways to reach Russian strike requirements for nitrogen (0.5 mg/l N-NH4 and 9.5 mg/l N-NO3) and phosphorous (1 mg P/l) concentrations in treated wastewater.
In this process, polyphosphate
accumulated microorganisms (PAO) passes through anaerobic, anoxic and aerobic
conditions. In anaerobic conditions, PAO uptake rapid biodegradable organic
COD (RBCOD), firstly volatile fatty acids (VFA), and storage them as polyhydroxyalkanoates
(PHA). Energy for this process produced by polyphosphate hydrolysis. In
the same time, in anaerobic conditions take place hydrolysis and acidification
of another forms of organic COD presenting in wastewater. In anoxic conditions,
PAO, which can use NO3-
as electron acceptor (denitrification process), oxidize PHA for growth
and uptake phosphorous from liquid phase with polyphosphate formation.
Heterotrophs can used hydrolyzed in anaerobic condition organic COD for
denitrification. In aerobic conditions, PHA oxidation, growth and phosphorous
uptake proceed using oxygen. In the same time, nitrification and COD oxidation
take place.
We can design this process
for wastewater flows from 10 till 500,000 m3/day
(new block at Luberetzkaya wastewater treatment station) using continuos
flow carousel aeration tanks, sequenced batch reactors (SBR) or sequenced
batch bed reactors (SBBR). Also this technology allows a tremendous reduction
of energy consumption and waste sludge production if anoxic dephosphatation
is used.
Contact person:
Dr. S.V.Kalyuzhnyi, Dept. of Chem. Enzymology, Chemistry Faculty., Moscow State University, 119899
Moscow, Russia; Phone:
7-(095)-9395083; Fax: 7-(095)-9395417; email: svk@enz.chem.msu.ru