Two-step biological treatment of coke oven wastewater

Due to high concentrations of pollutants, some of them inhibitory or toxic, coke oven effluents belong to the most delicate industrial wastewaters. Application of conventional biological treatment technology requires low-loaded, i. e. large volume bioreactors.

Sensitve biological reactions such as nitrification are always endangered by shock loads of critical constituents such as cyanides. Separating the treatment process into a first biological step for carbonaceous BOD removal, hydrolysis and denitrification followed by a second step for nitrification of ammonia and combining the two steps via a nitrate recycle allows an overall reduced reactor volume design and protects slow growing sensitive autotrophic bacteria from inhibitory and toxic effects of respective pollutants. Full scale application of such a two-step process in a German coke oven effluent treatment plant is demonstrated. At the present the subject is in Easteurope very acute in connection with the modernisation of the Iron and Steel Industry.There are many inquires concerning the procedere while Linde-KCA-Dresden GmbH already started working on a few new projects in Easteurope.



Copyright: © DIV Deutscher Industrieverlag GmbH
Quelle: GWF 07-08 / 2004 (August 2004)
Seiten: 7
Preis inkl. MwSt.: € 7,00
Autor: Dr. Manfred Morper
Anton Jell

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