The hottest power plant in the United States cause

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Heavy metals in groundwater caused by American power plants exceed the standard? On July 14th, 2017, an official from the Tennessee environmental protection department said that according to the latest test results, the arsenic and lead contents in the groundwater of Allen thermal power plant in southwest Memphis exceeded the safe drinking water standards. At one of the monitoring points, the arsenic content in the water 15 meters underground is more than 300 times higher than the federal drinking water standard of the United States. Tennessee has also previously exposed the scandal of improper disposal of waste from thermal power plants that polluted rivers. Some environmental protection organizations sued the Tennessee River Basin Authority, arguing that the waste from the galatine thermal power plant under its jurisdiction was improperly disposed of, resulting in the pollution of the Cumberland River. Environmental protection organizations have long suspected that the groundwater of Allen thermal power plant has been polluted. Arsenic and lead are heavy metals, mostly from fly ash, the waste of thermal power plants. If the fly ash is disposed improperly, it may overflow with rainwater. Pollution of groundwater. As soon as this news came out, many residents near thermal power plants in China panicked: is the water in my home also polluted

fly ash refers to the fine ash collected from the flue gas after coal combustion. Fly ash is the largest solid waste source of thermal power plants. Industry insiders said that usually every 4 tons of coal consumed will produce 1 ton of fly ash. Fly ash occupies a large amount of land. If it is stacked and disposed without protective measures, under the action of natural forces, soluble components such as heavy metals will overflow with rainfall, infiltrate downward from the surface, and make groundwater contain harmful substances. In January 2017, the Ministry of environmental protection officially issued the "technical policy for pollution prevention and control of thermal power plants", in which the prevention and control of solid waste pollution requires that fly ash should follow the principle of priority comprehensive utilization, use special storage sites, and the storage facilities should be managed in accordance with the relevant requirements of the "standard for pollution control of general industrial solid waste storage and disposal sites" (gb18599); The comprehensive utilization of fly ash should give priority to the production of ordinary portland cement, fly ash cement and concrete, and its indicators should meet the requirements of fly ash used in cement and concrete (gb/t1596)

storage of fly ash from power plants in China

1 Ash yard management

as most of the fly ash is treated by external supply, the power plant shall conduct humidification and layered rolling treatment for the fly ash and slag temporarily unloaded in the ash yard according to the regulations. Sprinkle water in time according to the weather conditions to prevent dust. In order to more effectively prevent dust from the ash yard, the surface of the temporarily unused ash stacking area shall be solidified to prevent random ash removal and avoid dust pollution to the environment. On the basis of the original trees around the ash yard, many power plants will replant windbreak belts to form windbreak forests and reduce the occurrence of wind and dust

2. Management of the spray and flood drainage system of the ash yard

the high-level water tank of the ash yard is kept at a reasonable water level, and the ash yard can be sprayed at any time, while preventing the overflow of the high-level water tank from discharging to the environment. Control the water level of the low-level water tank of the ash yard, and reserve enough volume to prevent the leachate overflow of the ash yard during heavy rain. In rainy seasons and before rainstorm, the staff of the power plant will strengthen the inspection of the ash yard, check the flood interception ditch of the ash yard, prevent mountain torrents from entering the ash yard and low-level pool, keep the rainwater of the flood interception ditch unobstructed into the urban drainage ditch, and timely drain the rainwater around the low-level pool

3. Management of leachate from ash yard

the environmental testing station of thermal power plant regularly monitors the leachate from ash yard, and the monitored items include pH value, SS, COD, oil, fluoride, arsenic, sulfide, etc. The monitored data will be entered into the plant information management system. It is strictly forbidden to discharge the leachate from the ash yard. The leachate is reused and sprayed on the ash yard

4. Measures to prevent ash lifting in the ash yard during typhoon

after receiving the typhoon and gale alarm, the staff of the power plant will immediately patrol the ash yard, try to reduce the ash unloading area, properly spray water on the surface of the uncured ash yard and increase the number of rolling passes, so as to improve the compactness. The ash yard is equipped with a certain amount of plastic woven cloth, which is used to cover the surface when raising ash, and then spray water with high-level pool water and water gun after covering

5. Ash silo and transportation management

in order to prevent fly ash from being discarded and scattered along the way during transportation and polluting the environment, the power plant Party of fly ash sold will implement quadruple single tracking closed-loop management during transportation. All transport vehicles are equipped with anti scattering and loss covers to ensure that the transport vehicles are clean and tidy. Strengthen the maintenance of dry ash packer and other equipment to reduce the dust during dry ash loading and packaging. The ash silo shall be cleaned every day to prevent dust from flying

comprehensive utilization of fly ash

as an inevitable product of coal-fired power plants, the comprehensive utilization of fly ash, turning waste into treasure and harm into benefit, has become one of the power production links of thermal power plants in China for design and other projects

comprehensive utilization of fly ash refers to the process of extracting substances from fly ash, and using fly ash as raw material to produce building materials, chemical products, composite materials and other types of products. At present, the field of resource utilization of fly ash in China mainly involves building materials, road engineering, filling materials and agricultural applications. The products mainly include cement, brick, concrete, ceramsite and inorganic refractory fiber materials produced with fly ash as raw materials. Fly ash has gradually become an attractive raw material for new building materials and chemical products with rich resources, low prices and benefits in the domestic and international markets

at present, China's thermal power plants have basically formed three clear technical paths for the comprehensive treatment of fly ash: first, high-end technologies, mainly including the extraction of silica and the manufacturing of ceramic fibers, which are in a leading position at home and abroad; The second is the mid-range technology, which mainly includes the technology of regularly clearing the scale of manufacturing floors and various air-cooled coolers. These technologies are the first in China, and they are basically mature, and the product market prospect is very good; The third is practical technology, mainly including the manufacturing of autoclaved bricks and blocks, insulation boards and partition boards. Give full play to the carbonization characteristics of thermosetting polyurethane. Through these three paths, the wholly-owned of fly ash can be basically realized to optimize the utilization rate of solar energy

the comprehensive utilization of fly ash belongs to the project of comprehensive utilization of resources encouraged by the state, which has been supported by clear policies in terms of Taxation, examination and approval, capital, etc. For example, the relevant person in charge of Shanxi Provincial Development and Reform Commission said that for the comprehensive utilization project of fly ash, you can apply for the coal sustainable development fund and enjoy the support of relevant tax relief policies

there is no waste in the sky. Garbage is a resource placed in the wrong place. Not only does the waste discharge of thermal power plants in China need to meet the standard and be recycled, but also before the construction of major power plants, environmental impact assessment should be carried out to analyze the possible impact on the environment after the project is completed and put into operation, and pollution prevention countermeasures and measures should be put forward. Therefore, the public can eliminate their concerns about the surrounding environment and groundwater pollution caused by thermal power plants

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