Process for the biological purification of waste water.

摘要

Process for the biological purification of waste water and process for the recovery of N-compounds including the steps of bringing the pH of the suspension of the surplus sludge at a value of between 8 and 11 and hydrolyzing it in the presence of a volatile base at a temperature of between 90 and 300°C, which base (preferably NH<Sub>3</Sub>) is removed from the hydrolysate formed after termination ofthe hydrolysis.

N-compounds can be recovered from the hydrolysate, which can also be converted to cattle feed.