Odor is inevitable in sewage treatment, and its odor mainly comes from volatile compounds with odor in sewage to be treated, which are volatilized by mechanical movements such as equipment stirring and overturning, resulting in odor.
In the process of transportation and storage, sewage releases odor due to the action of microorganisms. There are also odors generated due to the process conditions and requirements in the sewage treatment process. Odor molecules produced during sewage treatment are mainly nitrogen-containing and sulfur-containing compounds, such as ammonia and hydrogen sulfide.
As long as the sewage is treated according to the requirements of national comprehensive sewage treatment, the treated sewage will reach the standard and will not cause harm to human body.
Extended data:
The national standard GB 14554-93 defines malodor as all gas substances that stimulate the olfactory organs, cause people's unhappiness and destroy the living environment.
Industrial production, urban sewage, sludge treatment and garbage treatment facilities are the main sources of malodorous gases.
Odor gases are mainly produced in sewage pumping stations, water intake grids, aerated grit chambers and primary sedimentation tanks during sewage treatment, sludge concentration, dehydration, drying and transportation during sludge treatment, composting, landfill, incineration and transportation during garbage treatment, and corresponding production sources such as chemical pharmaceuticals, rubber plastics, paints and coatings, leather printing and dyeing, animal husbandry and fermentation pharmaceuticals.
References:
Baidu encyclopedia-odor absorption