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Valve Hardware (Filters, Flow Controls, Positioners etc)
News Release from: PCI-Memtech/PCI-Water
Edited by the Engineeringtalk Editorial
Team on 28 February 2002
Membrane plant improves waste management
Ciba Specialty Chemicals Industries (Thailand) recently commissioned PCI-Memtech to provide a new nanofiltration plant for the concentration of highly coloured wastewater prior to special disposal.
As part of its continued commitment to improve the overall waste management at its Mahachai textile dyestuff manufacturing facility, Swiss-owned Ciba Specialty Chemicals Industries (Thailand) recently commissioned PCI-Memtech to provide a new nanofiltration (NF) plant for the concentration of the highly coloured wastewater prior to special disposal During an earlier plant upgrade, which improved the overall production efficiency, PCI-Memtech had installed an NF plant configured with tubular membranes which offer low risk of blockage and increase dye concentration from about 10 to 25% TS prior to spray drying
This article was originally published on Engineeringtalk on 1 Feb 2001 at 8.00am (UK)
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This original tubular NF plant has 240m2 of membrane area and has increased yield and improved drying performance.
Following this earlier success, PCI-Memtech recently installed a second tubular NF plant at Ciba in Mahachai, including a clean-in-place (CIP) tank and pump skid, for the treatment of the highly coloured wastewater.
The plant is equipped with PCI proprietary nanofiltration membranes capable of dye colour retention and concentration but enabling salt/water passage through the membranes, and treats the highly coloured effluent that would previously have passed to the existing conventional wastewater treatment plant.
This effluent is pH adjusted and conditioned, prior to the NF process.
During NF processing, highly coloured wastewater is concentrated (ie the retentate) and separated from water and salt solution (ie the permeate).
The permeate is then fed to the existing wastewater treatment works on site.
The retentate is stored, thus allowing a smaller volume of more concentrated liquor to be disposed of.
Installation of this second tubular NF plant is designed to improve effluent handling efficiency by processing 50m3/day of highly coloured waste waters.
With a high percentage of Mahachai's produce exported, PCI-Memtech's NF plants help to make Ciba Specialty Chemicals Industries Ltd in Thailand an environmentally acceptable world-class manufacturing operation for textile dyestuffs.
PCI-Memtech offers technology that can be applied throughout industry for dyestuff processing and for separation of speciality chemicals.
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