Raw Materials and Wastes for Stock and Yarn
Finishing Mill Processes
Table
6: Stock and Yarn Finishing Mill
Basis: 1 tonne of yarn
| PROCESS |
INPUTS |
WASTES |
| |
Raw materials |
Water |
Energy |
Liquid |
Solid |
Gas |
| Mercerise |
Cotton or Cotton Blend
Yarn or Stock NaOH |
N.A. (1)(3) |
N.A. |
N.A. (1)(3) |
|
|
| Bleaching |
H2O2
NaOCl |
N.A.(1) |
N.A. |
(1) |
|
Vapours |
| Dyeing |
Dyes, Auxiliaries See
tables 10,11 |
See Table 8 |
El. 9100-1180 KWh Steam 11.74
GJ (2) |
Highly Variable (1) |
|
Vapours |
(1) See tables 6.1 and 6.2 for the
amount of water used and waste load for stock and
yarn finishing mills.
(2) Energy required for Pressure Package
Dyeing of Polyester Yarn.
(3) It is not clear if the mercerization of
fabrics is similar to stock and yarn mercerization.
Table 6.1: Amounts of Water
Typically used in Stock and Yarn Finishing Mills
Units: m3/t
| Minimum |
Median |
Maximum |
| 3.3 |
100.1 |
557.1 |
Table 6.2:
Characteristics of Stock and Yarn Finishing
Effluents and Amounts of Waste Load Generated (median
values)
| Units |
BOD |
COD |
TSS |
O&G |
Phenol |
Cr |
Sulphide |
| mg/l |
250 |
800 |
75 |
- |
0.12 |
0.12 |
0.09 |
| Kg/t |
20.7 |
62.7 |
4.6 |
1.6 |
15.0 |
12.0 |
27.8 |