1.1 本试验方法用于确定可能在土工布、排水土工复合材料或土工布/土壤过滤器上累积的生物生长潜力和相对程度。 1.2 本试验方法使用在较长时间内测量流速来确定堵塞量。 1.3 该试验方法可适用于非饱和和饱和条件。 1.4 该测试方法可以使用恒定水头或落差测量技术。 1.5 如果确实发生生物堵塞，该试验方法也可用于指示反冲洗、杀生物剂处理或两者兼有的可能性，以进行补救。 1.6 以国际单位制为单位的数值将被视为标准。以英寸-磅为单位提供的数值仅供参考。 1.7 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.8 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 本试验方法以性能为导向，用于确定不同液体是否以及在多大程度上对土工织物过滤器产生生物活性，从而降低其流动能力。该方法的使用主要面向垃圾填埋渗滤液，但可以使用来自特定场地的任何液体或由生物微生物的预定混合物合成的任何液体。 5.2 该测试可用于比较不同类型土工布、排水土工复合材料或土壤/土工布组合的流动能力。 5.3 该测试通常需要相当长的时间，例如，长达1000小时，生物活性才能启动、生长并达到平衡状态。试验得出的曲线旨在表明 现场 土工布或土壤/土工布过滤器的性能。 5.4 试样可在读数之间的不饱和排水条件下孵化，或始终保持饱和。第一种情况允许空气渗透到流动柱中，从而形成需氧条件。第二种情况可能导致缺少空气；因此，它可以模拟厌氧条件。 5.5 可以使用恒定水头测试程序或基于落差测试程序确定流速。 在任何一种情况下，包含土工布或土壤/土工布的流动柱是相同的；只有头部控制装置发生变化。 注1: 已经发现，一旦生物堵塞开始，恒定水头测试通常通过的液体量不足，无法准确测量。因此，有必要使用落差测试，该测试可以根据透明塑料立管上两个指定点之间相对少量液体的移动时间进行测量。 5.6 如果在流速曲线中发现堵塞程度过高，则该装置允许用水或含有杀生物剂的水进行反冲洗。 5.7 得出的流速曲线旨在用于全尺寸土工布、排水土工复合材料或土壤/土工布过滤系统的设计，以及垃圾渗滤液收集和清除系统的可能修复方案。

1.1 This test method is used to determine the potential for, and relative degree of, biological growth which can accumulate on geotextile, drainage geocomposites, or geotextile/soil filters. 1.2 This test method uses the measurement of flow rates over an extended period of time to determine the amount of clogging. 1.3 This test method can be adapted for unsaturated as well as saturated conditions. 1.4 This test method can use constant head or falling head measurement techniques. 1.5 This test method can also be used to give an indication as to the possibility of back flushing, biocide treatment, or both, for remediation purposes if biological clogging does occur. 1.6 The values in SI units are to be regarded as the standard. The values provided in inch-pound units are for information only. 1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This test method is performance oriented for determining if, and to what degree, different liquids create biological activity on geotextile filters thereby reducing their flow capability. The use of the method is primarily oriented toward landfill leachates but can be performed with any liquid coming from a particular site or synthesized from a predetermined mixture of biological microorganisms. 5.2 The test can be used to compare the flow capability of different types of geotextiles, drainage geocomposite, or soil/geotextile combinations. 5.3 This test will usually take considerable time, for example, up to 1000 h, for the biological activity to initiate, grow, and reach an equilibrium condition. The curves resulting from the test are intended to indicate the in-situ behavior of a geotextile or soil/geotextile filter. 5.4 The test specimen can be incubated under unsaturated drained conditions between readings, or kept saturated at all times. The first case allows for air penetration into the flow column and thus aerobic conditions. The second case can result in the absence of air; thus it may simulate anaerobic conditions. 5.5 The flow rate can be determined using either a constant head test procedure or on the basis of a falling head test procedure. In either case, the flow column containing the geotextile or soil/geotextile is the same; only the head control devices change. Note 1: It has been found that once biological clogging initiates, constant head tests often pass inadequate quantities of liquid to accurately measure. It thus becomes necessary to use falling head tests, which can be measured based on time of movement of a relatively small quantity of liquid between two designated points on a clear plastic standpipe. 5.6 If the establishment of an unacceptably high degree of clogging is seen in the flow rate curves, the device allows for back flushing with water or with water containing a biocide. 5.7 The resulting flow rate curves are intended for use in the design of full-scale geotextile, drainage geocomposite, or soil/geotextile filtration systems and possible remediation schemes in the case of landfill leachate collection and removal systems.