Investigations on coloured waste waters from the organic food industry revealed a direct connection between colouring, humic acid (HA) content and rest-COD. The results were confirmed by measurements on model waste waters. It is demonstrated that COD/HA characterization during the biodegradation allows a sufficiently exact evaluation of the degradability. During biological treatment the HA content remains almost constant. Experimental results demonstrate that the content of refractory substances can be strongly reduced by adsorption on charcoal or by ultrasonic treatment. In some cases the HA content can be strongly reduced by preventing lyse processes in earlier treatment stages. (WEN)SIGLEAvailable from TIB Hannover: F94B958+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekNiedersaechsisches Ministerium fuer Wissenschaft und Kultur, Hannover (Germany)DEGerman
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