Process for the reduction of nitrite concentration in phosphate bath systems

摘要

Process for the reduction of nitrite concentration in systems for treating workpieces or the like in baths having water circulation according to Patent DE 4220401, the water for replenishing the wash baths and controlling the process solution concentration being recovered from the process solution itself by means of an evaporator unit and the water recovered for replenishing the wash baths, before being introduced into these, being passed through an ion exchange for nitrite removal. <IMAGE>