Cleaner Technology Transfer to the Polish Textile ... - Miljøstyrelsen

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Figure 10. Polymer precipitation dependency on pH, salinity and temperature. Figure 11. A DynaSand filter. 96 Demonstration plants Flocculation, precipitation, filtration, flotation and centrifugation have been tested in pilot-scale for concentrating and dewatering the suspended precipitates. A reduction in suspended solids of 99-99.5% is possible. Flocculation with very high-molecular anionic polymers at a level of 2-5 ppm quickly gathered the suspended precipitates and flocculated within few minutes with a very low level of suspended solids in the water. Further more, highmolecular anionic polymers precipitate the cationic coagulation polymers, whereby a surplus, if present, will flocculate out of the water. Based on pilot-tests, a DynaSand contact filtration system was installed to decolourize the biologically treated waste-water at Martensens Fabrik A/S. Designed waste-water flow is 4.000 m 3 /day, but the flow can be as low as 1.000 m 3 /day. The system comprises five DynaSand units and a flow-proportional in-line addition of one of the specialized organic polymers.
Conclusions The optimal use of chemicals can be reached when dozing PAC successively followed by one of the specialized organic polymers and finally dozing a very high-molecular anionic polymer. The organic polymers can be used alone, but are more expensive. A spiral tube with inline mixers for dozing and mixing the chemicals and a sandfilter can decolourize the waste-water for about 1-2 US $/m 3 . Through laboratory-scale experiments it was demonstrated, that a possible way of reusing the chemically precipitated dye-stuff would be to transport it to the municipal WVTP, and dose it into the digester for co-digestion together with the municipal sewage sludge. Attention must be taken not to overdose organic polymers. The decolouring effect decreases by overdosing and the organic polymers have a high fish toxicity. References Wenzel, H., Knudsen, H.H., Kristensen, G.H., Hansen, J. Reclamation and reuse of process water from reactive dyeing of cotton. Desalination, 1995. 97
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1999 Cleaner Technology Transfer to
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Content Preface 5 Summary 7 Part 1.
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Summary Areas of pollution preventi
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1.1 Programme description Programme
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Focus on cost-effective options par
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2.1 Introduction This Idea catalogu
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Topic 1. Minimization in consumptio
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Topic 3. Optimization of cooling by
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Topic 5. Temperature control of coo
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Topic 7. Minimization of water for
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Topic 9. Exchange of batch dyeing m
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Topic 11. Introduction of in situ r
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Topic 13. Optimization of counter c
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Topic 15. Procedure for cleaning of
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Topic 17. Change from batch to cont
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Topic 19. Desizing with enzymes Cas
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Topic 21. Substitution of APEO dete
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Topic 23. Change from monoreactive
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Topic 25. Substitution of carriers
Page 45 and 46: Topic 27. Substitution of afterchro
Page 47 and 48: Topic 29. Dry conditioning Case ill
Page 49 and 50: Topic 31. Mechanical softening proc
Page 51 and 52: Topic 33. Re-use of pure cooling wa
Page 53 and 54: Topic 35. Re-use of chemically load
Page 55 and 56: Topic 37. Re-use of water from rins
Page 57 and 58: Topic 39. Separation techniques for
Page 59: Topic 41. Evaporation and reclamati
Page 63 and 64: 3.1 Introduction During the Cleaner
Page 65 and 66: The ever increasing demand to shade
Page 67 and 68: The dyeing process The reactive dye
Page 69 and 70: hardness in water and extract from
Page 71 and 72: Figure 7. The effect of complexing
Page 73 and 74: Reduced process time Seilund and C.
Page 75 and 76: Tabel 1. Degradation af APEO. Table
Page 77 and 78: Alkylphenol ethoxylates (APEO) This
Page 79 and 80: 3.4 Reclamation and re-use of proce
Page 81 and 82: Figure 1. Typical process waters fr
Page 83 and 84: Figure 2. The dependency of precipi
Page 85 and 86: Advantages and limitations of the w
Page 87 and 88: Figure 5. Environmental benefits of
Page 89 and 90: Kolb, M., B. Funke, H.P. Gerber and
Page 91 and 92: Figure 3. Typical process water fro
Page 93 and 94: Table 1. Selected chemical for delc
Page 95: Figure 9. Profiles for dye-stuff pr
Page 99 and 100: The conclusion based on lab-scale r
Page 101 and 102: During the period from 1992 to 1995
Page 103 and 104: 3.8 Environmental labelling John Ha
Page 105 and 106: The products to be labelled with th
Page 107 and 108: 3.9 Improvement of the rinsing effi
Page 109 and 110: Table 1. Documentation of savings i
Page 111 and 112: Part 4. Implementation projects 111
Page 113 and 114: 4.1 Introduction On the basis of th
Page 115 and 116: and a continued pumping is achieved
Page 117 and 118: The new recipes were tested in a la
Page 119 and 120: 4.4 Savings and substitution of env
Page 121 and 122: To illustrate the order of magnitud
Page 123 and 124: Data sheet Publisher: Ministry of E
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