METHOD OF WASTE WATERS FINAL TREATMENT FROM TECHNOLOGICAL PROCESSES OF LEATHER TANNING

摘要

After mechanical-biological purification of waste water from technological processes of tanning leather, waste water containing ammoniac and increased chromium is cleaned by sorption on granular clinoptilolite. After saturation, washing with a solution of sodium chloride alkalizated by sodium hydroxide, ammoniac is eluated, stripped by air and caught on a foam absorber, which is recycled into the technology of tanning leather. Residual colmation of natural clinoptilolite by chromium is liquidated by final washing of the bed by 0.02 hydrochloric acid. Ammoniac water and the eluate with residual chromium is recycled into the technological process of tanning leather. Ammoniac and residual chromium are removed from waste water with high effectiveness.