DECONTAMINATION PROCESS OF WASTEWATER CONTAINING ELEMENTAL MERCURY

摘要

To remove, in particular, elemental Hg from waste waters (effluent) from battery factories, from chlor-alkali electrolysis and from electroplating plants, a suitable preliminary stage is their oxidising treatment with H2O2 in the presence of readily available and cheap compounds of iron or iodine which, as catalysts, enable the reaction of Hg with H2O2 to give a precipitatable Hg compound within an acceptable time for practical operation. After precipitation of the Hg as a relatively insoluble compound and filtration, the waste water solution is brought into contact with MnO2, excess H2O2 decomposing to give H2O and O2, and then led to a Hg-selective ionexchanger, which traps any residual quantities of Hg. Water thus detoxified is not burdened with significantly any byproducts formed during the treatment.