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Recycling of Tannery Delimimg-Bating Wastewater by Ultrafiltration Purification with Polyimide Membrane

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Abstract:

Tannery deliming-bating wastewater contains lots of pollutants including ammonium salt, interfibrillary substances and residual enzymes. In order to reduce the pollution, the wastewater was purified by ultrafiltration with polyimide membrane and recycled in deliming-bating process. Solutes in the wastewater were evaluated by COD, total nitrogen and suspended substance. The effects of ultrafiltration parameters on permeate flux and solute rejections were investigated, and the characteristics of wastewater, as well as membrane cleaning were measured during the recycling. The results show that a steady permeate flux of over 31.5L/m2h with rejections to COD of above 89% and total nitrogen of above 82% can be obtained at 25°C under 0.090MPa in pH7.5 during the ultrafiltration. In the repeated recycling, neither the organic substances nor the nitrogenous substances could be accumulated in operation liquor. The recycling process has the same deliming-bating effect as conventional process. It has good potential for industrial application.

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Info:

Periodical:

Advanced Materials Research (Volumes 726-731)

Pages:

2818-2822

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.726-731.2818

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Cite this paper

Online since:

August 2013

Authors:

Hong Ru Wang*, Gang Zhang, Yong Jian Li

Keywords:

Deliming-Bating Wastewater, Polyimide Membrane, Recycling, Ultrafiltration (UF)

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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