1. Sewage treatment of power plant sewage As an important base of energy, the sewage generated during the operation of the power plant cannot be ignored. The sewage of the power plant is mainly in the following links:
Boiler blowdown: This is the most common wastewater in power plants, which is mainly used for continuous and regular blowdown of boilers. It contains high concentrations of salts, suspended solids and small amounts of organic matter.
Circulating Cooling Water Effluent: Power plants use large quantities of circulating cooling water to cool equipment. This part of the water absorbs pollutants such as oils, suspended solids, and chemicals during the cycle and eventually needs to be discharged.
Chemical water treatment system drainage: In order to ensure water quality, the power plant will set up a chemical water treatment system, which will produce drainage during operation, containing certain chemicals and impurities.
If these effluents are discharged untreated, they can have serious impacts on the environment and human health.
2. The harm of power plant sewage to people and the environment.
Effects on human health: Power plant effluents may contain heavy metals, organic matter, and other toxic substances. Once these substances enter the human body, long-term accumulation can lead to various health problems, such as cancer, neurological diseases, etc.
Damage to the environment: High concentrations of salts, suspended solids and chemicals can damage aquatic ecology and affect the survival and reproduction of aquatic organisms. At the same time, these substances can also contaminate the soil and affect the growth and quality of crops.
3. Power plant sewage treatment process plan.
According to the characteristics of power plant wastewater, we propose the following complete wastewater treatment process scheme:
Wastewater collection: First, the wastewater generated by each production link in the power plant is collected through the pipe network system to ensure that the wastewater can be treated centrally.
Pre-treatment: The pre-treatment stage mainly includes the removal of large particulate matter, suspended solids and preliminary water quality adjustment. It can be achieved by grids, sedimentation tanks and other equipment.
Biochemical treatment: Biochemical treatment is the core link of wastewater treatment in power plants. Through the activated sludge method or biofilm method, the organic matter in the wastewater is removed by the metabolism of microorganisms. This stage can effectively reduce the organic content in the wastewater.
Advanced treatment: The advanced treatment stage is mainly for further purification of biochemically treated wastewater. Advanced oxidation technology, activated carbon adsorption, ion exchange and other methods can be used to remove heavy metals, harmful substances and color in wastewater to ensure that wastewater meets national and local discharge standards.
Sludge treatment: The sludge produced in the biochemical treatment process needs to be stabilized and harmless. Sludge thickening, sludge dewatering, sludge incineration and other methods can be used to reduce and harmless sludge. The treated sludge can be recycled, such as making building materials, fertilizers, etc.
Wastewater reuse or discharge: The wastewater treated above can be reused or discharged according to the water quality. Reuse can be used for recycling in power plants or for supply to other industries; The discharge needs to meet the relevant environmental protection standards to ensure that it does not cause secondary pollution to the environment.
IV. Conclusion. Wastewater treatment in power plants is a key part of environmental protection and sustainable development. Through the implementation of the above process flow scheme, we can effectively reduce the content of harmful substances in the wastewater, ensure that the wastewater meets the national and local discharge standards, and realize the reduction, recycling and harmlessness of the wastewater. As environmental engineers, we have the responsibility and obligation to promote the development and application of sewage treatment technology in power plants, and contribute to the protection of lucid waters and lush mountains.