Installation for purifying waste water, esp. domestic waste water - has 2 biologically intensified filtration stages, 1st ŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸŸ for nitrification and 2nd for denitrification

摘要

The filter installation has a low-intensity biological activation stage followed by a biologically intensified filtration stage which carries out a physical cleaning, and in which the nitrogen cpds. in the water leaving the activation stage are converted to nitrates. Both filtration stages are biologically intensified and be connected in series, the first stage acting as a nitrification stage and the second as a de-nitrification stage. The two stages are fitted for back-flushing and aeration, and each consist of a number of filter elements connected in parallel and filled with a porous filter material such as activated carbon with a grain size of 1.5 to 3mm. USE/ADVANTAGE - Used in the cleaning of waste water, esp. domestic waste water. The appts. occupies much less space, having an initial low-intensity activation stage but without affecting the rate of elimination of nitrogen and maintaining a high rate of purifcn. as well as sepg. the undesirable and toxic hydrocarbon cpds.