What are the types and hazards of power plant wastewater?

　　The following is an introduction to the types and hazards of power plant wastewater:

　　1. Types of power plant wastewater

　　In the process of thermal power plants, water is recycled. In addition to being used to transfer energy in the steam-water circulation system, water is also used for cooling and flushing of many equipment. The sources of power plant wastewater and sewage are different, and the types of wastewater are slightly different. Generally speaking, thermal power plant wastewater includes industrial wastewater, ash flushing water, domestic sewage, etc.

　　1. Power plant industrial wastewater. Power plant industrial wastewater is the total wastewater discharged from the power plant, including industrial cooling water drainage, chemical water treatment system acid and alkali regeneration wastewater, filter backwashing wastewater, boiler cleaning wastewater, coal washing, dust removal wastewater, oily wastewater, cooling tower sewage wastewater, etc. Different sections have different types of wastewater and pollutants, and the content and discharge volume are not fixed. The pollutants in this type of wastewater include: suspended solids, oil, organic matter and sulfide, etc. This type of wastewater is difficult to handle.

　　2. Power plant ash flushing water. Ash flushing water is one of the main pollution sources of thermal power plants and coal-fired power plants. It generally refers to the water used to flush slag and dust collector ash, which is generally discharged after settling in the ash field. Ash flushing water accounts for about 40% to 50% of the total wastewater. The types and contents of pollutants in ash flushing water are greatly affected by the type of coal, coal burning method and dust removal method. The main indicators of ash flushing water exceeding the standard in coal-fired power plants are pH value, suspended solids, salt content and fluorine, and some power plants also have heavy metals.

　　3. Domestic sewage in power plants. In thermal power plants, domestic sewage accounts for about 10% of the total water demand of power plants. The pollutant composition in domestic sewage is relatively complex, mainly domestic wastewater. Its quantity, composition and pollutants are related to the living habits and water consumption of residents in power plants.

　　2. Hazards of power plant wastewater

　　The hazards of thermal power plant wastewater are mainly that the pH value and suspended solids exceed the discharge standards. Due to the difference in pickling and purification media, pickling wastewater contains toxic and harmful chemical components such as sulfate and nitrogen hydroxide. After this type of wastewater containing various pollutants is discharged into the water body, it not only changes the original material composition of the water, but also the pollutants participate in the transformation and circulation of energy and matter, destroying water resources, damaging aquatic biological resources, and endangering industrial and agricultural production.

　　In summary, the types of power plant wastewater and the hazards of power plant wastewater are explained.