The removal ratios of impurities in the tanning discharge were more than 99% for Cr 3+ and hue, more than 87% for SS, but only 47% for COD mainly via co sedimentation.

• 铬鞣废水Cr3+ 和色度去除率大于 99%25 ,SS去除率大于 87%25 ,但COD去除率只有 4 7%25 ,主要依靠协同沉降。