The Clean Water Act promulgated the implementation of water quality standards and contamination limits for a wide range of pollutants including oil and grease. Specifically, the USEPA, in 40 CFR Ch. 1, prohibits “the discharges of oil that cause a film or sheen upon or cause discoloration of the surface of the water. . .” Several state and local agencies have adopted this statement in addition to setting concentration limits, that is, 15 mg/L or even 5 mg/L. The purpose of this practice is to evaluate the performance of a separator in regards to the regulations and user requirements when subject to a sudden release. The sudden release may occur in dry weather and local personnel may attempt to hose the contaminated area down or it may occur on a rainy day and enter the separator mixed in with the runoff.
This practice is not applicable if the influent to a separator is simply runoff from contaminated rainwater. For this case, see Practice D 6104
This practice is not applicable if the influent to a separator is conveyed by a pumping means.
1.1 This practice covers the procedure, any necessary related apparatus, and the sampling technique to be used in determining the performance characteristics of oil/water separators subjected to contaminated run-off.
1.2 This practice does not address the determination of the performance characteristics of an oil/water separator subjected to the sudden release of a relatively large quantity of hydrocarbons that may appear, in pure form or at high concentration, in the influent to the separator. In this case, refer to Practice D 6157.
1.3 This practice does not address the determination of the performance characteristics of an oil/water separator subjected to a mechanically emulsified influent such as provided by a pump.
1.4 This practice does not investigate the ability of the separator to handle debris or suspended solids, that is, grit or tree leaves.
1.5 While the effluent may meet code requirements for total oil and grease content, this practice does not address the presence of soluble organics, i.e., Benzene, Toluene, Ethyl-benzene and Xylene (BTEX''s) which may be detected in the effluent. It also does not make any provisions for the effects of detergents, surfactants, soaps, or any water soluble matter (that is, salts), or any portion of an essentially insoluble matter that may be found in solution on separation. (Effects of certain water soluble chemicals or solids may be investigated by adding them to the water at predetermined constant concentrations.)
1.6 In order to estimate the effect of water temperature on the performance of the separator, the tests described in this practice must be performed at two water temperatures. The selected temperatures must be at least 10176;C (18176;F) apart, with the temperature ranging from a minimum of 0176;C (32176;F) to a maximum of 50176;C (122176;F).
1.7 This practice does not make any provisions for the variation of pH or temperature during a test run. Refer to Appendix X1 for further detail.
1.8 This practice can be used with a variety of hydrocarbons. It adopts No. 2 fuel oil with a density of 845 kg/m3 (52.73 lbm/ft3) and a viscosity of 1.9 to 4.1 centistokes at 40176;C (104176;F) and SAE 90 lubricating oil with a density (See SAE J313) of 930 kg/m3(58 lbm/ft3) at 15.5176;C (60176;F) and a viscosity (see SAE J306) of 13.5 to 60; 24 centistokes at 100176;C (212176;F) as the comparative testing media. It is understood that the results obtained from this practice are only directly applicable to No. 2 fuel oil and SAE 90 lubricating oil for the tested concentrations and only careful interpolation or extrapolation, or both, is allowed to other hydrocarbons. Low viscos......
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