| purification | <chemistry> A central part of downstream processing. Large-scale purification methods are used to take a crude fermentation supernatant or cell homogenate and isolate the product from it in a fairly pure form. (14 Dec 1997) |
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| water purification | Any of several processes in which undesirable impurities in water are removed or neutralised; for example, chlorination, filtration, primary treatment, ion exchange, and distillation. It includes treatment of waste water to provide potable and hygiene water in a controlled or closed environment as well as provision of public drinking water supplies. (12 Dec 1998) |
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