Process for removing polychlorinated biphenyls from aqueous solutions

Zp sob odstra ov n polychlorovan²ch bifenyl z vodn²ch roztok biologicky s p° davkem organick ho substr tu a slou enin dus ku a fosforu spo v v tom, e se roztokem polychlorovan²ch bifenil s p° davkem pomocn ho organick ho substr tu a slou enin dus ku a fosforu jako ivin skr p vrstva kv ry. S v²hodou lze jako pomocn² substr t pro vytvo°en mikrofl ry pou t slou eniny obsahuj c bifenylovou strukturu. Jako dus kat ivina a sou asn organick² substr t se pou ije hexamethylentetramin. S v²hodou se kv ra nejd° ve skr p pomocn²m substr tem a ivinami a pot se postupn zvy uje p° davek vody zne i t n polychlorovan²mi bifenyly.\ The invented process for removing polychlorinated biphenyls from aqueous solutions by biological way and with addition of organic substrate and nitrogen and phosphorus compounds is characterized in that the solution polychlorinated biphenyls in which auxiliary organic substrate and nitrogen and phosphorus compounds as nutrients have been added is sprayed onto a slag layer. Preferably, compounds containing biphenyl structure may be used as the auxiliary substrate for culturing a microflora. Hexamethylenetetramine is used as a nitrogen nutrient and at the same time as the organic substrate. It is preferred that first the auxiliary substrate and nutrients are sprayed onto slag and only then the addition of water polluted with polychlorinated biphenyls is gradually increased.