Enzymatic Bleach Cleanup in Cotton Dyeing
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Scan day: 20 February 2014 UTC
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Description: Case study of the Dutch Institute for Applied Environmental Economics (TME), describing the technique of using enzymes (Terminox Ultra) to replace chemical agents in bleach neutralization prior to the dyeing of cotton fabrics.
Enzymatic bleach cleanup in cotton dyeing Raw cotton fabric is usually bleached using hydrogen peroxide. The bleaching chemical has to be removed before the dye is applied in order to prevent reaction between the bleach and dye. The traditional method of removing the bleach is by rinsing the fabric with water a number of times. Alternatively, a mild reducing agent can be used to neutralize the bleach. In either case, large amounts of water (up to 40 liters per kg of fabric) are required for rinsing resulting in discharge of large volumes of wastewater.
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