For the last 3 campaigns, continuous biological water purification by means of the R.T.- LEFRANCOIS fermenter has been successfully applied upon a part of the recycled flume- and wash waters of the Tirlemont beet plant.
This process enables treatment of undiluted highly polluted waters.
Since only a short retention time (3-4 hours) of these waters is provided, it is important to supply to the bacteria all the required nutrients for their metabolic reactions. The waste waters of a sugar factory are mostly characterized by a deficiency in N and P which therefore have to be furnished from an external source.
The addition of polyphosphate- and urea-solutions increases significantly the running-costs of the purification process.
We have tried to appeal upon nutrients which are readily present within the sugar factory itself.
During the last campaign, ammoniacal nitrogen has been supplied to the waters by adding condensates from the evaporation station.
Such nitrogen can be straightly assimilated by most of the bacteria. This way of processing has lead to a change of the morphology of the activated sludges and to an increase in their biological activity.
Both from a biological and economical point of view, the use of these ammoniacal condensates seems interesting as a nitrogen source in the biological water purification.
Proceedings: CITS 1975
pdf download: CITS1975-525-542.pdf