Organics

A Method To Predict A Potential TOC Incursion From A Municipal Water Source

By Paul Tan, W.T. Huang, and C.H.Chiuwas

CARBON INSTRUMENTS MONITORING ORGANICS REVERSE OSMOSIS SEMICONDUCTORS TOC

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Abstract

Editor’s note: Welcome to a technical article from our library of more than 2,100 technical and water business articles published since 1984. This article by the late Paul Tan, W.T. Huang, and C.H.Chiuwas published in the October 2007 issue of Ultrapure Water Journal. This article examines a way to predict a TOC incursion in a microelectronics plant that receives feedwater from a municipality.

Organic compounds are compounds that have carbon as the basic building block.  It may be of plant or animal origin, or may even be synthetically produced.  Since most organic substances contain carbon-hydrogen bonds, they are commonly referred to as hydrocarbons.

It is well known that not all organics are the same and they are selectively removed by different treatment process.  A complex total organic carbon (TOC) contaminant does not necessary mean that it is more difficult to be treated unless they are of the same type of organics.  It is, therefore, difficult to predict how easy it is to treat 2 parts per million (ppm) of TOC in city water unless we know what are the types of TOC present.  Generally, a fluctuation of 200 parts per billion (ppb) of TOC in city water is an acceptable fluctuation.  However, if the increase is due to urea, it will almost cause a spike in TOC at the point of delivery, since the present treatment system does not remove urea effectively.  This makes monitoring of TOC at the city water less meaningful, as there is no direct correlation between levels of difficulty of removing organics versus the detected concentration

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