1.1 本规程涵盖了通过化学混凝絮凝，然后重力沉降来减少水或废水中溶解、悬浮、胶体和不可沉降物质的处理方法评估的一般程序。该程序可用于评估颜色、浊度和硬度降低。 1.2 本规程对混凝过程中通常遇到的变量进行了系统评估。 1.3 以国际单位制表示的数值应视为标准值。 1.4 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。 1.5 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 本规程允许在相同的水和相同的实验条件下，对水和废水处理中使用的各种混凝剂和助凝剂进行评估。 5.2 还可以通过该实践评估混凝剂和助凝剂的浓度及其添加顺序的影响。

1.1 This practice covers a general procedure for the evaluation of a treatment to reduce dissolved, suspended, colloidal, and nonsettleable matter from water or wastewater by chemical coagulation-flocculation, followed by gravity settling. The procedure may be used to evaluate color, turbidity, and hardness reduction. 1.2 The practice provides a systematic evaluation of the variables normally encountered in the coagulation-flocculation process. 1.3 The values stated in SI units are to be regarded as standard. 1.4 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. 1.5 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 practice permits the evaluation of various coagulants and coagulant aids used in the treatment of water and waste water for the same water and the same experimental conditions. 5.2 The effects of concentration of the coagulants and coagulant aids and their order of addition can also be evaluated by this practice.