The domestic sewage treatment process is an important part of urban environmental governance, and its purpose is to purify the sewage generated in the daily life of residents through a series of technical means to make it meet the discharge standard, so as to protect the environment and maintain the ecological balance. This article will introduce the flow, main technologies and advantages and disadvantages of domestic sewage treatment process in detail, in order to provide reference for relevant practitioners.
1. Domestic sewage treatment process.
The domestic sewage treatment process mainly includes four stages: pretreatment, primary treatment, secondary treatment and treatment.
1.Pretreatment.
Pretreatment is the first step in the treatment of domestic sewage, which mainly includes grids, grit tanks and regulating tanks. The grid is used to remove large pieces of debris in the sewage, such as plastic bags, paper, etc.; The grit tank removes inorganic particles in the sewage, such as sand and stones, through sedimentation; The regulating tank plays a role in balancing water quality and quantity, and creates conditions for subsequent treatment.
2.Primary treatment.
Primary treatment is mainly to remove suspended solids and floating objects in sewage through physical methods, such as grease, hair, etc. In this process, the technologies commonly used include grids, grit remitting tanks, sedimentation tanks, etc. After primary treatment, the concentration of suspended solids in the wastewater can be greatly reduced, reducing the burden for subsequent treatment.
3.Secondary treatment.
Secondary treatment is the core part of domestic sewage treatment, which mainly removes organic substances from sewage through biological methods. Commonly used secondary treatment technologies include activated sludge method, biofilm method, etc. These methods use the metabolism of microorganisms to convert organic substances in sewage into inorganic substances, so as to achieve the purpose of purifying water quality.
4.*Dispose.
*Treatment is based on secondary treatment to further remove nutrients and trace harmful substances from sewage. In this process, technologies commonly used include depth filtration, activated carbon adsorption, ultraviolet disinfection, etc. **The purpose of treatment is to bring the treated water quality up to a higher standard to meet the needs of different uses.
Second, the main technology of domestic sewage treatment and its advantages and disadvantages.
1.Activated sludge method.
The activated sludge method is a commonly used secondary treatment technology, which has the advantages of good treatment effect, strong adaptability, and ability to treat many types of wastewater. However, the activated sludge method also has some disadvantages, such as large footprint, high energy consumption, and easy sludge expansion.
2.Biofilm method.
The biofilm method is a technology that uses microorganisms on the biofilm for sewage treatment, which has the advantages of good treatment effect, small footprint, and low energy consumption. However, the biofilm method also has some drawbacks, such as susceptibility to shock loads and the need to clean the biofilm regularly.
3.Depth filtration.
Depth filtration is a commonly used treatment technology, which has the advantage of being able to remove fine particles and harmful substances in sewage and improve water quality standards. However, depth filtration also has some drawbacks, such as the filter material is easy to clog and needs to be replaced regularly.
Third, the development trend of domestic sewage treatment process.
With the continuous improvement of environmental protection requirements and the continuous progress of technology, the domestic sewage treatment process is also developing. In the future, the domestic sewage treatment process will develop in the direction of high efficiency, energy saving, environmental protection and intelligence. At the same time, the continuous emergence of new technologies and new materials will also provide more choices and possibilities for domestic sewage treatment processes.
In short, the domestic sewage treatment process is an important link in urban environmental governance, which is of great significance for protecting the environment and maintaining ecological balance. By continuously optimizing and improving the domestic sewage treatment process, we can better cope with the increasingly severe environmental problems and contribute to the sustainable development of mankind.