By A. Richard Horrocks
The edited papers which include this booklet have been provided on the overseas convention, Ecotextile ’98, which used to be organised together by way of Bolton Institute and the British cloth expertise workforce.
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Extra info for Ecotextile ’98: Sustainable development
COD, BOD and suspended solids are consented to sewers but subject to limits for discharge to surface waters. Colour is already consented in some parts of the UK. 43 Pentachlorophenol, permethrin and cyfluthrin are restricted by legislation. Volume and flow rates form the basis for charging and are usually consented. Table 1: Standards and consents for aqueous eftluent discharge Parameter Temperature pH BOD COD Suspended Solids Colour Toxic substances Volume and flow Standard / Consent Below 42°C at point of discharge Between 6 and 9 at point of discharge 30mg/1 to surface waters 50mg/1 to surface waters Consented to sewer 20 mg/l to surface waters Consent to sewer Below 1ppm consented Restricted by legislation Basis for charging consented Of particular interest is the emerging colour problem and consents for discharges are based on not being able to observe any colour.
Print paste savings Even when using a standard colour controlled blending operation that accurately controls colour strength the amount required on a fabric can still vary by as much as 25% due to colour uptake inconsistencies. Consequently there is invariably a significant colour return on most runs. Over production runs into 100's oftonnes per year. A sophisticated re-weighing and colour matching system that reuses all colour returns of 5kg or more would make estimated savings of nearly £70,000 per annum at a cost of just over £60,000.
For the initial outlay the payback on energy alone was three years. PLANT SERVICES When looking at energy and water savings it is difficult to detach the plant services from the processing. , the steam raising plant and distribution systems; the electricity supply for motive power, compressed air and lighting; as well as water storage, distribution and use. ; and electricity providing lighting, motive power and powering compressed air systems Energy savings for boilers Boiler distribution losses are typically 20 to 30% of the gross fuel input.
Ecotextile ’98: Sustainable development by A. Richard Horrocks