Method for the treatment of sewage containing nitrites

摘要

In a method for the treatment of sewage containing nitrites comprising the reduction of the nitrite with urea in an acid medium it is provided, to obtain end products friendly to the environment and an economic conduction of the method, that a greatly acid urea solution be supplied and circulated through a pipe reactor, and that the sewage containing nitrite to be treated should be injected into the pipe reactor. Furthermore, the invention relates to a device for carrying out the method and to an examination device which is particularly suitable for the periodic determination of the nitrite content in a circulation duct.