ANALYTICAL AND LABORATORY EQUIPMENT 35
acid cleaner that also contains surfactants can go after many oils and greases that might be present in addition to the scale. In the food processing industry, soils can contain proteins and starches; in this case enzymatic cleaners might be needed. Most foulants are combinations of various soils; therefore choosing a formulated cleaning product with multifunctional ingredients is usually best. One US wastewater
treatment plant has an auxiliary effluent re-use facility constructed specifically to produce reverse osmosis quality water destined for ethanol production. Te plant requires approximately 1,000,000 gallons (3.8 million litres) of reverse osmosis water per day above its normal processing volumes. Te wastewater control systems manager manages the effluent re-use facility to ensure this additional volume is met on a daily basis. A key component of the effluent re-use facility is the ultra-filtration process, which uses 0.4µ polyvinylidene difluoride (PVDF) membranes with an upper pH limit of 10.0. Tese membranes are fouled primarily with petroleum sulphonates and bacterial secretions. Particularly in cold weather, the upstream BOD step has frequent “upsets,” where the bacteria die and secrete a water- soluble foulant that adheres strongly to the PVDF polymer and significantly increases the trans-membrane pressure (TMP). Tese “upsets” must be resolved quickly to ensure a plentiful supply of pure water.
Micro-90 is a mild yet powerful cleaning concentrate
Passing the test To determine the optimal cleaning regime, the plant manager systematically evaluated the performance of 20 different cleaners and hundreds of different combinations and concentrations, including commonly used commodities and many formulated membrane cleaners. Te results found International Products Corporation’s Micro-90 was one of the top performing cleaners in the study. Micro-90 stood out because the product performed better than all of the commodities and other formulated membrane cleaners, particularly on the bacterial secretions. It worked effectively without the use of phosphates, silicates, and strong alkalis, at a membrane-compatible pH of only 9.5, and at a 0.3% concentration.
The synergy Micro-90 is a mild yet powerful, multipurpose, alkaline cleaning concentrate that has long been used in laboratories, industrial applications and critical cleaning processes. It is a chelating detergent that contains ionic and
non-ionic ingredients, which combine to produce a variety of cleaning actions. It lifts, disperses, emulsifies, sequesters, suspends, and decomposes soils, then rinses away leaving the surface absolutely clean. Micro-90’s target soils include oil, grease, wax, tar, flux, particulates, hard water stains, and biological debris. It is highly effective at defouling filter membranes and can be validated in critical cleaning applications.
A model for the future Micro-90 has been in use at the effluent re-use facility since October 2010. Some of the original PVDF membranes are still used and continue to see considerable TMP drops after cleaning with Micro-90. Although the bacterial upsets cannot be prevented, their fouling can be resolved in a predictable manner with the use of Micro-90. Since the initial use of the cleaner, the effluent re-use facility design engineers have recommended it to other similarly designed effluent re-use facilities because of the product’s effectiveness, safe profile, compatibility and economical cost per use. Because so many variables can exist in choosing the right cleaning product for each facility, it is important for treatment plant and laboratory operators to work with cleaner manufacturers that can offer them technical guidance and a variety of products to best meet their needs.
For more information ✔ at
www.scientistlive.com/eurolab
IPC CLEANERS Micro-90 Micro Green Clean Micro A07 Zymit Pro
MATCH CLEANER TO INDUSTRIAL SOIL CLEANER pH
9.7 9.8 3.0 7.5
Because there are so many variables, it is worth seeking out a cleaner manufacturer that not only offers a range of products designed for many different applications but can also provide technical guidance
TYPICAL SOILS REMOVED
Greases, oils, metals Greases, oils Hard water salts, scales Biological, protein, polysaccharides
Michele Christian is with International Products Corp.
www.ipcol.com
www.scientistlive.com
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