How does a wastewater treatment plant work?
Release time:
Sep 06,2024
Source:
Sewage treatment equipment is a kind of equipment used to treat sewage, and its working principle is to remove pollutants in sewage through a series of physical
Sewage treatment equipment is a kind of equipment used to treat sewage, and its working principle is to remove pollutants in sewage through a series of physical, chemical and biological reaction processes, so that the water quality is purified. The following is a detailed description of the working principle of sewage treatment equipment.
First, physical treatment
The physical treatment process of sewage treatment equipment mainly includes filtration, sedimentation and flotation. Through the grille, sand filter and other equipment to remove the larger solid particles and suspended solids in the sewage. These substances are removed by interception and precipitation in the grizzly and sand filter tank.
Second, chemical treatment
In the chemical treatment process, the colloidal particles and dissolved pollutants in the sewage are chemically reacted by the addition of chemicals to produce precipitation or flocs, which are then removed by sedimentation and filtration. Commonly used chemicals include coagulants, flocculants and disinfectants.
Third, biological treatment
Biological treatment is the most important part of sewage treatment equipment, mainly using the metabolism of microorganisms to remove organic matter in sewage. Biological treatment includes anaerobic treatment and aerobic treatment in two forms. Anaerobic treatment is mainly through the role of anaerobic microorganisms to decompose organic matter and produce biogas and other by-products. Aerobic treatment is under aerobic conditions, through the role of aerobic microorganisms will be oxidized organic matter decomposition into carbon dioxide and water.
Fourth, the depth of treatment
After biological treatment of sewage, deep treatment is also required to remove residual suspended solids, phosphorus, nitrogen and other nutrients. Deep treatment mainly includes filtration, disinfection and phosphorus and nitrogen removal processes. Filtration can further remove suspended solids, while disinfection prevents the spread of disease by applying disinfectants to kill pathogenic microorganisms in the water. Phosphorus denitrification is to remove phosphorus and nitrogen in the water through chemical precipitation or biofilm method and other technologies to prevent eutrophication of water bodies.
V. Sludge treatment
In the process of sewage treatment, a large amount of sludge will be produced, and this sludge needs to be treated. Common sludge treatment methods include thickening, dewatering, drying and incineration.
In short, the working principle of sewage treatment equipment is a complex physical, chemical and biological reaction process, through a series of treatment processes, the pollutants in the sewage will be removed to achieve the purpose of purifying water quality. These equipments are of great significance for protecting the environment and maintaining the ecological balance.
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