Verfahren und Anlage für die biologische Abwasserbehandlung

摘要

Process for biological purification of sewage making it possible either to ensure a complete treatment of the carbonaceous pollution and of the nitrogenous pollution at the nominal flow rate or the removal of the biological oxygen demand or BOD alone during a large increase in the nominal flow rate, especially in the case of rain, using bacteria as bound cultures, characterised in that it consists in employing the modifications of the surrounding medium, that is to say the oxidation-reduction potential which depends on the presence or absence of dissolved oxygen and the composition of the water in contact with the bacteria, either in order to modify the enzyme system of the flora present in the bacterial film of the bound culture in order to assign to the removal of the BOD a bound culture which hitherto was working on denitrification, or to promote in the same bacterial film the development of the most appropriate flora for the intended purpose: removal of the BOD or nitrification.