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>BIOLOGICAL NITRIFICATION-DENITRIFICATION TREATMENT OF AMMONIUM NITROGEN POLLUTED HANOI- GROUNDWATER USING A NOVEL ACRYL-RESIN FIBER FOR BIOMASS ATTACHMENT
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BIOLOGICAL NITRIFICATION-DENITRIFICATION TREATMENT OF AMMONIUM NITROGEN POLLUTED HANOI- GROUNDWATER USING A NOVEL ACRYL-RESIN FIBER FOR BIOMASS ATTACHMENT