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 [14] Steam 11.74 GJ [22] (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 [10] 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) [10]**
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