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Recovery of polyvinyl alcohol and hot water from the textile wastewater using thermally stable membranes |
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| Affiliation: | 1. Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi''an 710127, China;2. Shaanxi Key Laboratory of Chemical Reaction Engineering, School of Chemistry and Chemical Engineering, Yanan University, Yan''an 716000, China |
| Abstract: | The recovery of polyvinyl alcohol from the textile process waste streams is presented. Three filtration systems are described that are able to operate at 100°C or above. Two systems are tubular. One uses carbon tubes to support a zirconium oxide membrane and the other uses stainless steel tubes coated with a fused titanium dioxide layer to support a zirconium hydroxide membrane. The third system described is an asymmetric polyvinyl sulfone membrane in a spiral wound configuration. All three systems have been in operation for several years displaying the successful recovery of polyvinyl alcohol. The economics of the recovery process are described. Also presented is the application of automated control to the PVA recovery process and to the recycle of bleaching rinse water to the scouring process. |
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