Anammox – an advanced technology of nitrogen removal from wastewater

Summary

The first in Russia Anammox-type technology has been developed in «Mosvodokanal» JSC in cooperation with «Fundamental Principles of Biotechnology» Federal Research Center of the Russian Academy of Sciences. The technology is designed for the treatment of filtrate of centrifuges for digested wastewater sludge dewatering. The technology is based on the microbiological process of ammonium oxidation with nitrite under anoxic conditions. Since this process does not require organics Anammox can be considered as the most economical technology for processing industrial effluents in which organic matter is absent or in deficiency, for example, effluents of nitrogen-fertilizer plants, livestock or poultry production farms etc. Besides, studies are carried out and Anammox technologies are being developed for wastewater treatment at low temperatures (cold Anammox) as well as for using this process in common wastewater (not nitrogen-concentrated) treatment (Anammox in the main process line). Since anammox-bacteria are easily separated from liquid (being a part of immobilized biofilms or granules) and can be adapted to a wide range of operating conditions, Anammox technology without any doubt is a promising technology of removing nitrogen from different wastewater.

Key words

wastewater , pilot plant , anammox , ammonium removal technology , dewatering centrifuge filtrate , livestock production wastes , chemical plant effluents , low temperature

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Development of the first in Russia Anammox type technology

Summary

The first in Russia Anammox type technology has been developed in «Mosvodokanal» JSC in cooperation with «Fundamental principles of biotechnology» Federal Research Centre of the Russian Academy of Sciences with support from RF Ministry of Education and Science. The technology is designed for the purification of filtrate of centrifuges that dewater digested wastewater sludge. Anammox technology is based on the microbiological process of ammonium oxidation with nitrite under anoxic conditions. This process has been implemented at more than 100 wastewater treatment facilities all over the world in various technologic options. This group of technologies is the most cost-effective and high developing biotechnology of nitrogen removal from wastewater. Anammox type technology has been implemented at the pilot plant that provides for the purification of dewatering centrifuge filtrate. In terms of the process parameters the developed technology can be compared to the foreign alternatives but adapted to the conditions of the Liuberetskie Wastewater Treatment Facilities in Moscow. Single reactor process is carried out at 30–37 °С with new anammox-bacteria. From the economic, technologic and environmental point of view Anammox technology is very attractive compared to the traditional options of biological nitrogen removal. Anammox process lacks the demand in organic matter; whereas the oxygen demand is reduced by 60% resulting in significant energy saving. It can be applied at the wastewater treatment facilities both in Russia and overseas.

Key words

wastewater , pilot plant , anammox bacteria , ammonium removal technology , large-scale bioreactor , dewatering centrifuge filtrate