Cleaner Technology Transfer to the Polish Textile ... - Miljøstyrelsen
Cleaner Technology Transfer to the Polish Textile ... - Miljøstyrelsen
Cleaner Technology Transfer to the Polish Textile ... - Miljøstyrelsen
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Topic 36.<br />
Multi-pipe system for direct<br />
re-use<br />
Case illustration:<br />
Multiple re-use system for<br />
direct re-use of renewable<br />
process water types<br />
Concept Before <strong>the</strong> dyeing procedure, almost all fabrics are pre-treated, typically by<br />
washing and sometimes bleaching, and this pre-treatment is finalized by a<br />
number of hot or cold rinses. After <strong>the</strong> dyeing procedure, <strong>the</strong> dyeing bath is<br />
followed by a number of baths, <strong>the</strong> last typically being warm and cold rinses.<br />
The rinsing water typically amounts <strong>to</strong> 70-80% of <strong>the</strong> <strong>to</strong>tal water consumption<br />
when fabric is washed and dyed. Danish analyses have shown that especially<br />
<strong>the</strong> last portions of rinsing water – amounting <strong>to</strong> 20-30% of <strong>to</strong>tal water consumption<br />
– have a quality indicating a possible re-use as first rinsing water.<br />
Re-use of different types of water for different purposes requires installation<br />
of a multi-pipe system connected <strong>to</strong> a multi-tank system. The extent of such a<br />
system will depend on local conditions: possible limitations in physical space<br />
for new piping and tanks, types of processes and <strong>to</strong> what extent re-use is possible.<br />
Improvement potentials Large water, effluent and energy savings. Economical calculation for Danish<br />
conditions have shown very short pay-back time for <strong>the</strong> installation.<br />
Relevance All companies.<br />
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