WASTE WATER ANALYSIS FROM A NEW GREEN PRETREATMENT OF COTTON FABRICS

Abstract

In the current context of sustainable development and environmental protection, finding and applying green technologies for textile finishing of cellulosic materials is a priority, being among the main objectives of current researches. Bioscouring treatment is one of the green processes for treating cellulosic textile materials that has successfully replaced classic alkaline treatment. Waste waters resulting from bio preparation are considered biodegradable and with low toxicity unlike alkaline treatment. An analysis and characterization of residual waters from the finishing processes is necessary in order to establish optimal parameters for disposal and low environmental impact, for reducing costs of waste water treatment and for efficient recovery and re-used. The paper presents a characterization of water resulted from a new bioscouring treatment of cotton fabrics using a commercial enzymatic product in ultrasound with sodium citrate as a chelating agent in comparison with bioscouring treatment were EDTA was and alkaline classical treatment. The main quality indicators of the residual waters analyzed were: pH, turbidity, conductivity, TSD, salinity, dry residue, total oxygen dissolved and chemical oxygen demand (COD-CCOMn). After analyzing the obtained data, similar values were observed for the two enzymatic treatments except the pH value which was lower for the process were EDTA was used, requiring a slight correction. For classical alkaline treatment, the obtained values exceeded the allowed limits for almost all analyzed parameters.

Keywords

• Cotton fabrics
• new green pretreatment
• residual water
• turbidity
• TDS
• Chemical oxigen demand