The presented work describes dechromation of waste tanning liquor utilising chrome sludge produced through enzymatic hydrolysis of chrome-tanned leather wastes.

The international and domestic studies and methods of the utilization of the used chrome liquor were summarized in this paper.

The recycling of the used chrome liquors is studied from viewpoint of changing laws of Cl -,SO 2- 4 and Na + in the recycling chrome liquors.

Treatment and reuse of Cr(Ⅲ) in chromic tanning wastewater;

The results showed that neodymium chloride made the properties of chrome chloride tanning liquor changed remarkably: accelerating the hydrolysis of chrome complexes", decreasing the charge of constituents and reducing the content of hydrated chrome complexes while .

This paper describes the analysis of the content of Zr in Chrominum-Alu-mini-um-Zirconium tanning liquor by method of low pressure ion chrematogrophy.

The study and application of lignin from pulping spent liquor was outlined in building,oil exploitation,rubber and plastics,water treatment chemicals and agriculture.

The combustion swelling properties of VIE of the pulping spent liquor of poplar,wheat straw and rice straw were investigated.