A large-scale test of combined hydraulic/microbial in situ sanitation of the first aquifer has been conducted on an industrial site contaminated by chlorobenzenes, chlorophenols, hexachlorocyclohexanes and BTX aromatics. Part of the contaminated ground water was treated in an above-ground water treatment plant, in which 99% degradation of the pollutants was achieved. After addition of nutrients and oxygen, the treated water was recycled into the aquifer. As a result, the pollutant concentration decreases to 0.1 mg BOD/l. The luminous bacteria test revealed the absence of toxicological effects. Remaining isolated subground centers of trichlorobenzene still caused a permanent recontamination of the aquifer. This effect could be proved by modelling the pollutant flow. (WEN)SIGLEAvailable from TIB Hannover: RO 6927(25) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman
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