A flux-enhancing forward osmosis-nanofiltration integrated treatment system for the tannery wastewater reclamation

Environmental Science and Pollution Research International
Parimal PalSuman Senapati

Abstract

Effective treatment of tannery wastewater prior to discharge to the environment as per environmental regulations remains a big challenge despite efforts to bring down the concentrations of the pollutants which are often quite high as measured in terms of chemical oxygen demand (7800 mg/L), total dissolved solids (5400 mg/L), chloride (4260 mg/L), sulphides (250 mg/L) and chromium. A pilot-scale forward osmosis and nanofiltration integrated closed loop system was developed for continuous reclamation of clean water from tannery wastewater at a rate of 52-55 L/m2/h at 1.6 bar pressure. The low-cost draw solution was 0.8 M NaCl solution. Continuous recovery for recycling the draw solute was done by nanofiltration of diluted draw solution at an operating pressure of 12 bar and volumetric cross-flow rate of 700 L/h. Fouling study revealed that the specific flat-sheet design of cross-flow forward osmosis module with counter current flow of feed and draw solution prevents the build-up of concentration polarization, thus enabling long-term filtration in continuous mode of operation without significant membrane fouling. This study culminates in the development of a compact, efficient and low-cost industrial wastewater treatment and recla...Continue Reading

References

May 30, 2012·Journal of Hazardous Materials·Xue JinChuyang Y Tang
Feb 1, 2013·Environmental Science & Technology·Bryan D CodayTzahi Y Cath
Oct 14, 2014·Water Environment Research : a Research Publication of the Water Environment Federation·Parimal PalRamesh Kumar
Nov 9, 2014·Environmental Science and Pollution Research International·Ramesh KumarParimal Pal

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Citations

Sep 6, 2017·Environmental Science and Pollution Research International·Masoud RastgarHasan Salehi

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