1.1 本试验方法用于确定可能在土工织物、排水土工复合材料或土工织物/土壤过滤器上积累的生物生长的潜力和相对程度。 1.2 该测试方法使用长时间内的流速测量来确定堵塞量。 1.3 该测试方法可适用于不饱和以及饱和条件。 1.4 该测试方法可以使用恒定水头或落水头测量技术。 1.5 如果确实发生生物堵塞，该测试方法也可用于给出关于反冲洗、杀生物剂处理或两者的可能性的指示，以用于补救目的。 1.6 以SI单位表示的数值应被视为标准。以英寸-磅单位提供的值仅供参考。 1.7 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 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》中确立的国际公认的标准化原则制定的。 ======意义和用途====== 5.1 该测试方法以性能为导向，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场渗滤液，但可以用来自特定地点或由生物微生物的预定混合物合成的任何液体进行。 5.2 该测试可用于比较不同类型的土工织物、排水土工复合材料或土壤/土工织物组合的流动能力。 5.3 该测试通常需要相当长的时间，例如长达1000小时，以使生物活性开始、生长并达到平衡状态。测试产生的曲线旨在指示 原地 土工织物或土壤/土工织物过滤器的行为。 5.4 测试样本可以在读数之间的不饱和排水条件下孵育，或者始终保持饱和。第一种情况允许空气渗透到流动柱中，从而允许有氧条件。第二种情况可能导致没有空气；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下降水头测试程序来确定流速。在任一情况下，包含土工织物或土壤/土工织物的流动柱是相同的；只有头部控制装置发生变化。 附注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以准确测量。因此，有必要使用降头测试，其可以基于相对少量液体在透明塑料立管上的两个指定点之间移动的时间来测量。 5.6 如果在流速曲线中看到不可接受的高度堵塞的建立，则该装置允许用水或含有杀生物剂的水进行反冲洗。5.7 由此产生的流速曲线旨在用于全尺寸土工织物、排水土工复合材料或土壤/土工织物过滤系统的设计，以及垃圾填埋场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.