Process for reducing the phosphate content in waste water in the production of metal salts of ascorbic acid 2-monophosphate

摘要

Process for reducing the phosphate content in the effluents from the preparation of salts of ascorbic acid 2-monophosphate, which is characterised in that A. the effluent from the crystallisation of the metal salts of ascorbic acid 2-monophosphate is treated with an alkali metal or alkaline earth metal hypochlorite, chlorine or H2O2 and B. the inorganic phosphate thus obtained by liberation from organically bound phosphorus and/or that still contained in the effluent is precipitated at a pH of 9-12 as sparingly soluble phosphate, in particular as calcium phosphate.