Wastewater treatment in thermal power plants
The invention of electricity completely changed production and people's way of life, but at the same time, in order to meet the growing demand for electricity. , people must continue to build power plant factories. With the rise of new energy sources, traditional coal-fired electricity generation has been replaced. However, the cost of new energy equipment is high and limited by geography. Coal-fired power plants still occupy most power plants. Growing demand for energy has worsened environmental damage. Reducing the damage caused by coal-fired power plants has become a top priority.
Here I have compiled some wastewater treatment methods for thermal power plants, let's take a look
1. Thermal energy production CharacteristicCharacteristics of factory wastewater:
Compared with ordinary industrial wastewater, the general characteristics of coal-fired power plant wastewater are as follows:
1, water quality and quantity vary widely and there are many types of classified wastewater.
2. The components of pollution in wastewater are mainly inorganic substances, mainly containing petroleum.
3. There is a lot of intermittent drainage.
2. Sources of wastewater from coal-fired power plants
Thermal power plants come from a wide range sources, but wastewater mainly falls into the following categories:
p>
1. Ash washing wastewater. Wastewater from slag washing and ash discharge from dust collectors represent half of the total.ble of the coal-fired power plant. Pollutants present in ash flushing wastewater include suspended solids, pH value and salt content. The content of these substances is related to the type of coal burned, the method of combustion and the method of transporting the ash.
2. Desulfurization wastewater. There are many impurities in coal, including sulfur. The flue gases after burning the coal in the boiler contain sulfur. These sulfur-containing flue gases cannot be directly discharged, and desulfurization of the wet flue gases is necessary. Desulfurization wastewater is produced during this process. This type of wastewater has high turbidity, high hardness, high salt content and many types of pollutants. In addition, the coal used in different coal-fired power plants is different, resulting in importante fluctuations in the quality of desulfurization wastewater.
3. Chemical wastewater and oily wastewater. This type of wastewater is a general term for various industrial drainages in coal-fired power plants, including cooling wastewater, coal transportation system flushing wastewater, oily wastewater, wastewater from cooling towers, etc.
3. Methods of treating wastewater from thermal power plants
1. Ash washing wastewater. The general treatment process of ash flushing wastewater, which accounts for a large proportion of coal-fired power plant wastewater, is to regulate the tank → heated coagulant enters the coagulator → coagulant helper → wastewater purifier At this stage, the slag rinsing wastewater is divided into. sludge and clean water and sludge can be putin the ash sludge tank for dewatering, clean water can be discharged into the clear tank;
2. Chemical treatment of wastewater. Chemical wastewater is divided into inorganic wastewater and organic wastewater, which need to be treated separately: the inorganic wastewater first enters the neutralization tank and is adjusted.The pH value is then treated. Because it contains a large amount of acid and alkali, recycling should be considered during processing. Precipitation, coagulation, adsorption, ion exchange, electrodialysis and other methods can be used for the effective treatment of organic wastewater, organic wastewater comes from organic pickling wastewater; boilers and evaporation ponds are used. Just deal with it.
3. Desulfurization wastewater. Due to their complex composition, wastewaterDesulfurization ducts contain oily nitrite, sulfate and a lot of suspended solids. Additionally, desulfurization wastewater contains many acidic substances and is very corrosive, so it must be properly treated before it can be discharged. A single piece of equipment cannot treat them effectively, so desulfurization wastewater requires further treatment. The desulfurization wastewater first enters the pretreatment system for flocculation, sedimentation and neutralization to reduce the suspended matter in the wastewater, increase the pH value of the wastewater and prepare for advanced treatment. Treat in depth.
I recommend using the evaporation method and using an MVR evaporator for processing. Although the technology of MVR evaporator is newer but the process is more mature, it has been used in various industries.ies. only a dozen years. Widely used in various industries, choosing a suitable evaporator plant is directly related to whether the desulfurization wastewater can achieve the "zero discharge standard".
As far as I know, the moisture content of domestic sludge is 80%, and sewage treatment plants generally do not accept it because the national standard stipulates that the moisture content of domestic sludge is 80%. burial must be less than 60%. Some sewage treatment plants pay private drivers between RMB 30 and 40 per ton. The driver will take the waste to a deserted area and throw it on the side of the road. If he is caught by local residents, he will be beaten and prosecuted. Some sewage treatment plants found cement plants or power plants and asked them to mix it and burn it in the kiln. A certain local government coordinated the price to 120yuan per ton. However, the cement plant is losing a lot of money and will not burn. If it's possible. Others are sent to landscaping companies.
It's better to find a place where you can host it, and it's more reliable to talk directly, because market conditions vary from place to place and there is no of reference value.