Looking for development of sustainable solution for recovery of NaOH from Mercerizing waste water,i.e. resource recovery,
Does anyone has waste water characterization for the same,
What are the end product (compound) formed when NaOH reacts with cotton fiber during the mercerizing process
Please suggest the present practices for such waste water.
Dear Dinkar,
The following publications describe a membrane-based treatment strategy for purifying the highly alkaline textile mercerization wastewater:
1-Separation Science and Technology
Volume 49, Issue 13, 2014
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Purification and Concentration of Caustic Mercerization Wastewater by Membrane Processes and Evaporation for Reuse
Abstract
A membrane-based treatment strategy was developed for purifying the highly alkaline textile mercerization wastewater. 0.2-μm MF and 100 kDa UF membranes were evaluated as pretreatment alternatives before 10 kDa UF and 200 Da NF membranes. Turbidity was almost totally removed by both pretreatment options, while UF (100 kDa) showed higher COD retention than MF. In total recycle mode of filtration, fouling of both UF and MF membranes were 80% reversible by physical and almost totally reversible (≥ 97%) by chemical cleaning. In the second stage filtrations applied to the pretreated wastewater samples, NF could yield high (97-98%) COD retentions and low permeate COD concentrations (≤ 22 mg/L), while 10 kDa UF could only reduce the COD concentration to 150 mg/L. While no NaOH was lost in the MF+UF process, the use of NF as second stage resulted in 12-17% NaOH retention. The permeate flux in all second stage processes were stable, implying that the majority of the feed components that would cause fouling had been removed in the pretreatment stages. Permeate of the MF+NF sequence was concentrated by evaporation with no foaming problems, showing that the hybrid process can be applied to recycle a purified and concentrated caustic stream to the mercerization process.
http://www.tandfonline.com/doi/abs/10.1080/01496395.2014.914039
2- IERI Procedia
Volume 9, 2014, Pages 71–76
International Conference on Environment Systems Science and Engineering (ESSE 2014)
Open Access
Study on Recycling Alkali from the Wastewater of Textile Mercerization Process by Nanofiltration ☆Yun Zhanga, , ,Shuai Shaoa, b,Weicheng Yua,Fenglin Yanga,
Xiaochen Xua
Abstract
This study has researched the treatment ability of nanofiltration technology in printing and dyeing mercerization process alkali wastewater and investigated the effect of different pressures and alkalinities on membrane flux. The effect of different operating conditions on COD removal rate and alkali penetration rate has been also investigated in this study. The experimental results show that nanofiltration technology can remove the COD in printing and dyeing mercerization process wastewater effectively and the removal rate is above 80%. We conclude that the membrane flux tends to increase as the operating pressure increases, and decrease as the concentration of alkali in feed liquor and COD increases. The infiltration liquor through membrane can be satisfactorily reused by the method of concentration, and the final recovery efficiency of alkali by nanofiltration membrane treatment is above 90%
http://www.sciencedirect.com/science/article/pii/S2212667814000914
3-Textile Dyeing Wastewater Treatment
Zongping Wang, Miaomiao Xue, Kai Huang and Zizheng Liu
Huazhong University of Science and Technology
China
http://cdn.intechopen.com/pdfs-wm/22395.pdf
4-https://books.google.ps/books?id=psf56CPmZsYC&pg=PA36&lpg=PA36&dq=to+treat+the+waste+water+from+Mercerizing&source=bl&ots=iXpYQahEZc&sig=vIH9Mu9CG1gRz85hrLZg4TJDtCk&hl=en&sa=X&ved=0ahUKEwji-5rfyPXLAhXBbBoKHY6PCPsQ6AEIGTAA#v=onepage&q=to%20treat%20the%20waste%20water%20from%20Mercerizing&f=false
5- Study on Recycling Alkali from the Wastewater of Textile Mercerization Process by Nanofiltration
Article · December 2014 with 14 Reads
DOI: 10.1016/j.ieri.2014.09.043
This study has researched the treatment ability of nanofiltration technology in printing and dyeing mercerization process alkali wastewater and investigated the effect of different pressures and alkalinities on membrane flux. The effect of different operating conditions on COD removal rate and alkali penetration rate has been also investigated in this study. The experimental results show that nanofiltration technology can remove the COD in printing and dyeing mercerization process wastewater effectively and the removal rate is above 80%. We conclude that the membrane flux tends to increase as the operating pressure increases, and decrease as the concentration of alkali in feed liquor and COD increases. The infiltration liquor through membrane can be satisfactorily reused by the method of concentration, and the final recovery efficiency of alkali by nanofiltration membrane treatment is above 90%.
Hoping this will be helpful,
Rafik
Dear Rafik,
thanks for the information provided by you in fact my line of action is also on similar line . I am looking for water water characterization for developing more foul resistant & robust design for NaOH recovery . thanks for support one again,
best regards
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