What is the reason for the foul smell of sewers in rainy days?

On rainy days, we often feel the unpleasant smell from sewers. The reasons for this smell are complicated and may be related to many factors, which will be analyzed one by one below.

First of all, sewage from sewers is an important source of odor. Sewers usually discharge domestic sewage, kitchen wastewater, bath wastewater and so on. These sewage contain various malodorous gases, such as ammonia, hydrogen sulfide, etc., so it will give off an unpleasant smell during drainage.

Secondly, there is often stagnant water in sewers, and in the process of stagnant water, microorganisms in sewage will produce a large number of toxic gases such as hydrogen sulfide and methyl mercaptan, which will be mixed with the surrounding gases, thus making us feel that the smell of sewage is more intense.

In addition, the accessories of the sewer pipe will also produce odor. Because there are many kinds of dirt in sewer pipes, such as grease and residue. These substances will produce a lot of odor when attached to the pipe wall.

In addition, the damage of sewers can also lead to unpleasant smells. Sewer pipes are often damaged due to aging, deformation, extrusion and other reasons, and in these leakage processes, odor will also be emitted.

Finally, underground pipeline system (such as natural gas pipeline, cable pipeline, etc. ) Connecting with sewer pipes will also have an impact on the smell of sewers. These pipes themselves contain various harmful gases, such as methane, which will affect the environmental odor near the sewage system.

To sum up, in rainy weather, the causes of sewer stench are complicated, so we should take measures, such as installing sewer sealing covers, cleaning pipes, and even redesigning and building sewer systems to reduce the generation and influence of these odors.