Module 4

MODULE 4 - CLEAN TECHNOLOGY IN THE BEAMHOUSE / TANYARD

LEARNING OBJECTIVES

Students need to fully grasp the concepts covered in Module 1 in order to fully understand Module 4.

This module covers the clean technology that can be used by the tanner in the beamhouse and tanyard, the processes used, the chemistry or biochemistry of the clean technology processes, the function of the chemicals used in the processes, equipment modifications that may be necessary in order to use the clean technology processes, as well as the advantages and disadvantages of the clean technology processes.

The following are covered in this module:

Processing of green hides

Salt-free curing methods

Environment-friendly degreasers (NPE-free)

Recycling of soak floats

Hair-save unhairing

Recycling of lime liquors

Low-sulphide unhairing

Sulphide-free unhairing

Organic acid deliming

Carbon dioxide deliming

Thrublu process

Salt-free pickling

Recycling of pickle liquors

Chrome liquor recycling

High-uptake chrome tanning

High-end pH basification

In order to fully understand the above processes, students need to understand the concepts such as COD, BOD, conductivity, total solids, TDS, SS, TKN, sulphide, chlorides, FOG, shrinkage temperature, chromium concentration in the effluent etc