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OHSA Proposed rule for hexavalent chromium exposure: overview, industry impact and control measures for the light metal finisher.

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Overview of US environmental legislation, compliance and list of necessary actions. (Abstr. only)

Oil & Grease Removal

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1 page "tutorial" summarises various approaches to cleaning, mainly using aqueous cleaners & electrocleaning.

Oil & Grease Skimmer

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Oil & Grease Skimmer

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Oil & Grease Skimmer with Filter Action

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Oil & Petroleum Separator

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Oil Absorbing Substance

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Oil accident leads to high effluent discharge

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Report on prosecution and legal implications.

Oil applicator for applying film onto metal strip

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Oil Binder Agent

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Oil control & surfactant preservation in aqueous cleaning processes

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Switch from vapour degreasing to aqueous cleaning is described, where oil formation & its removal or recovery becomes important. Focus on medium distillate oil-137 ppm water mixt. and a case study where recycling of this & surfactant was used to extend cleaner bath life. Abstr. only avail.

Oil Dissolution Ability of Electrolyzed Acid Water.

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The effect of oil dissolution in electrolyzed acidic solution was confirmed. An electrolyzed acidic solution obtained by electrolysis with a dilute sodium chloride and sodium sulfate solution was found to dissolve oil remarkably well, but in an ordinary acidic solution which was arranged to have the same pH as the electrolyzed acidic water hardly dissolved oil at all. The oil dissolution was assumed to be caused by the high concentration of dissolved oxygen contained in the electrolyzed acidic water. The electrolyzed acidic water of the sodium chloride solution thus decomposes a part of the oil. It was also recognized to have other effects, such as hydrophilicity and to produce several kinds of volatile byproducts. Since the electrolyzed acidic water of sodium sulfate did not show this kind of phenomenon, the oil decomposition was suspected to be caused by hypochlorous acid occurring at anode electrode during the electrolysis of the sodium chloride solution.

Oil mist deposition as contribution to energy saving and environmental protection

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Oil Removal and Nitriding of Sintered Parts using a DC Discharge.

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SURF Results of oil removal and nitriding of sintered parts are reported. Plasma technology was used for the sample cleaning as well as for nitriding. The whole process was carried out in the same reactor and in a single thermal cycle. Metallic pieces of unalloyed iron were produced by compaction at 600 MPa and sintered in a conventional resistive furnace at 1150°C. Samples were stored in oil for 30 days and treated in argon and hydrogen plasma. The electric discharge was generated in a confined electrodes configuration, with the samples placed on the anode. The sample cleaning was characterized by mass loss measurements, and results showed that a hydrogen discharge was more efficient than an argon one. Maintaining the temperature at 300°C, the majority of oil was removed for a time processing of 10 min. After the plasma cleaning of the samples stored in oil, surface treatment was carried out in nitrogen/hydrogen gas mixture with the sample working as the cathode and anode of the confined discharge. Similar nitrided layers were obtained for samples stored and not stored in oil, as well as for treatment performed in the cathode or anode configuration.

Oil Removal from Compressed Air

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Note on commercial filter reports a US study which quantifies its efficiency and suggests that < 0.1 ppm is readily attainable.