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ABSTRACT
The complex of micro- arid metafauna in the activated sludge is a good and reliable indicator for quality of the waste water treatment process. The structural and functinal biodiversity response of this complex towards high toxic pollutants oNP (ortho-nitrophenol) and PCP (pentachlorphenol) in a model waste water treatment process in laboratory scale has been investigated. The obtained results confirmed the more important role of the macroorganisms in the indication and assessment of the bioremediation and relatively passive role of the micro- and metafauna towards the direct detoxication of the hazardous pollutants.