TREATMENT OF CHROMIC TANNERY WASTES USING COAL ASHES FROM FLUIDIZED-BED COMBUSTION OF COAL

A new method of treatment for chromic tannery wastes containing chrome and large amounts organic substances has been investigated. It has be en found that the addition of certain types of coal ash from fluid bed combustion technologies, at a suitable temperature and pH, results in effective removal of Cr(III) compounds present in the wastes. The was tes could then be subjected to further processing in conventional biol ogical treatment units. The method is very simple, cheap, and effectiv e and could be used for chromic tannery wastes of different compositio ns.