In fact, we all understand that there is not just one type of pollutant in wastewater. Besides some conventional indicators, there are also special pollutants, such as fluoride, formaldehyde, nitrate nitrogen, oil, etc. Different industries have different pollutants. In this article, the manufacturer of online water quality monitoring instruments will work with everyone to understand and analyze in what forms oil pollutants exist in water?

Let’s first talk about what the main sources of oil pollutants are? This is quite broad! If it is high-concentration oily wastewater, it mainly comes from the petrochemical industry, textile industry, stone development, refining, storage, metal processing, auto repair and food processing, etc. Oil or grease is present in the discharged wastewater. The forms in which oil exists in the main wastewater are mainly classified into the following five physical forms according to the types of existence.

1.First, understand that free oil, when at rest, will rapidly rise to the liquid surface, thereby forming an oil film or oil layer of floating oil.

2.Mechanically dispersed oil, this type of oil is stable in wastewater.The performance is not high, and after being left to stand for a period of time, they will combine with each other to form floating oil.Have you ever heard of emulsified oil droplets? This oil droplet has a high degree of chemical stability. Due to the presence of surfactants in the water, it forms a stable emulsion.

3.The fourth point is the dissolved state. This oil is in the form of very fine and dispersed oil droplets, and the particle size of the oil droplets is even smaller than that of micro-electrolytic emulsified oil. Simply put, it is actually the oil that is truly dissolved in wastewater in terms of chemical concepts.

4.This point refers to solid-adhered oil, which is a type of oil droplet adsorbed on the surface of solid particles in wastewater.

As we all know, the oil in wastewater exists in different forms, so their treatment methods are also different. It should also be noted that after treating the pollution in the water, online monitoring of water quality should be done well to ensure the safety of water quality before discharging the relevant wastewater!