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Liquid Penetrant Wastewater Processing: New Developments

iquid penetrant testing (PT) produces rinse waters that can be contaminated with dyes, oils, heavy metals, and other materials that have been rinsed from the parts being inspected. Although most penetrants in use today are non-hazardous by design, the contaminated rinse water can cause problems when disposed of improperly. The highly visible dyes used in the penetrants can be cause for concern to anyone outside an inspection site who happens to see them. This can include waste treatment plant personnel and concerned citizens. Tracing the waste-water back to its source is facilitated by the trail of dye stains. Among the various techniques for treating these wastewaters, membrane filtration has long been considered the most cost effective technology available. Although it has been in use for over 20 years, membrane filtration (ultra-filtration or nano-filtration) has not been without its problems. Some of these problems are caused by the chemical constituents of the penetrants. This paper explores some of the changes and new developments in the processing of liquid penetrant wastewaters, both the fluorescent and the visible (red) types.


Hessinger, P., and M. White, “Treatment Alternatives for Liquid Penetrant Rinse Waters,” Materials Evaluation, Vol. 56, No. 8,  1998, pp. 969–970.

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