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Chinese Chemical Plant Selects Liqui-Cel Membrane Contactor System - A chemical plant in China is using a Liqui-Cel® Membrane Contactor system to remove CO2 downstream of a single pass RO system - Liqui-Cel.com / Membrana.com
Chinese Chemical Plant Selects Liqui-Cel Membrane Contactor System

 

NewswireToday - /newswire/ - Charlotte, NC, United States, 2009/10/15 - A chemical plant in China is using a Liqui-Cel® Membrane Contactor system to remove CO2 downstream of a single pass RO system - Liqui-Cel.com / Membrana.com.

   
 
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Electrodeionization (EDI) is widely used in many industrial water treatment systems throughout the world. In order to maximize the operating stability and life expectancy of an EDI system they were often designed with double pass RO using caustic injection pretreatment. However, in response to recent efforts to lower the capital expenditure and operating costs of double pass RO water treatment systems (DPRO), design engineers are looking at alternative options.

In high alkalinity feed water applications one economical option is to remove carbon dioxide from the water. Carbon dioxide gas dissociates in water to form HCO3 - and CO3 2-. These ionic species will contribute to the total anionic load to the EDI.

Historically, the conventional method for CO2 removal was to use a forced draft degassing tower (FDA) downstream of the RO. However, this is not a recommended practice today as the environmental air used in the tower comes into direct contact with the RO water which could cause significant contamination.

Liqui-Cel Membrane Contactors are the superior solution for CO2 removal. They operate under the same principle as a conventional FDA except the air and water contact is minimized with a membrane. Since the membrane pores are 0.02 microns in diameter, particles and other debris cannot pass through the pores to contaminate the RO water.

The contactor operates by flowing gas on one side of the membrane and liquid on the other. Gasses are removed from the liquid by lowering the partial pressure of the gasses in contact with the liquid. Filtered room air is drawn into the contactor using a vacuum pump. Since the room air and vacuum pump are low in carbon dioxide they create the driving force to remove the gas from the water.

A chemical plant in China is using a Liqui-Cel Membrane Contactor system to remove CO2 downstream of a single pass RO system. This design was selected over conventional two pass RO with a caustic injection system due to savings in capital and operating costs. The system was designed, built and installed by Changzhou Xianfeng Water Treatment Equipment Co., Ltd. The Deionization (DI) system is a fully integrated membrane system and operates without any chemical addition.

The capital, operating and reduction in chemical consumption costs make this an exciting and superior system designed for a high alkalinity water treatment system.

About Liqui-Cel®
Liqui-Cel (liqui-cel.com) is one of the world's leading manufacturers of membrane contactors used for degassing liquids around the world. Those contactors are widely used for O2 removal from water as well as CO2 removal from water.

 
 
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Chinese Chemical Plant Selects Liqui-Cel Membrane Contactor System

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