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Sewage and wastewater are mixed to say that they are dirty water to be discarded, but the degree of pollution is different. Among them, the nature and concentration of pollutants are random, and there is no standard to refer to. Only by gaining experience through practice can we grasp the laws of nature and the laws of sewage change.

There are three categories of modern treatment methods: physical method 2, chemical method 2, physical chemical method 3, biological method 3; The degree of treatment is divided into three levels: 1. The degree of treatment; after the suspension is filtered, the particles, colloids and organic solutes decompose 2,3. Deeper removal of residues.

The nature and type of sewage are different, and corresponding methods can be taken, but chemical and physical methods are the closest to users with small discharges: first, the colloid rapidly chemically decomposes to produce flocs dispersed in water, followed by the physical changes of adsorption between flocs, forming particles and precipitation, separating the pollutants in the water.

Second, the provisions:

Pollutants come from a variety of components, solids, turbidity, chromaticity, pH value, etc., which constitute the concentration level of sewage. High-concentration sewage cannot be treated even if more drugs are paid due to the lack of necessary space, but it increases the saturation of substances. Therefore, in the pretreatment test, the high concentration and low concentration are first fully adjusted to make the treatment mechanism meet the best conditions, which not only effectively but also reduces the consumption of chemicals.

Example 1: With a large septic tank, the late start of centralized sewage and sewage collection together with light, nature and water have been adjusted.