The way humans treat water has been for many years. Physical methods include the use of various filter materials with different pore sizes, and the use of adsorption or barrier methods to exclude impurities in the water. The more important adsorption method is the adsorption of activated carbon. The barrier method is to pass the water through the filter material, so that the larger impurities cannot pass through, and then get cleaner water. In addition, the physical method also includes the precipitation method, which is to allow impurities with a smaller specific gravity to float on the water to be removed, or to deposit impurities with a larger specific gravity to obtain. The chemical method is to use various chemicals to convert impurities in water into substances that are less harmful to the human body, or to concentrate the impurities. The oldest chemical treatment method should be regarded as adding alum to the water. After the impurities in the water are assembled, the volume changes. If it is large, it can be filtered to remove impurities. In this case, the focus is on chlorine treatment. I hope that after learning, everyone can have a certain grasp of the general situation of water treatment, the impact of chlorine on humans, and the dechlorination reaction.
人类处理水的方式已经存在很多年了。物理方法包括使用具有不同孔径的各种过滤材料，以及使用吸附或屏障方法来排除水中的杂质。更重要的吸附方法是活性炭的吸附作用。屏障方法是将水通过过滤材料，使较大的杂质无法通过，从而得到更清洁的水。此外，物理方法还包括沉淀法，即使较小比重的杂质浮在水上被去除，或沉淀较大比重的杂质。化学方法是使用各种化学物质将水中的杂质转化为对人体较少有害的物质，或浓缩杂质。最古老的化学处理方法应该是向水中加入明矾，通过将水中的杂质凝聚在一起，从而使体积变化，如果较大，可以通过过滤来去除杂质。在这种情况下，我们关注的是氯处理。希望在学习后，每个人能对水处理的概况、氯对人类的影响以及脱氯反应有一定的了解。
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