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Our country currently has 21 coal-fired power plants operating with capacity accounting for more than 30% of total power output of the country.
On average, coal-fired power plants emit 16 million tons of ash, slag and gypsum each year.
According to the Ministry of Industry and Trade, solid waste with ash and slag components of coal-fired power plants is a common solid waste, not a hazardous waste.
Therefore, users can safely use recycled products from this waste such as unbaked bricks or other building materials.
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Increasing upgrading investment
Deputy Director of Uong Bi Thermal Power Company - Nguyen Viet Dung said that in order to protect the environment, the Company:
- Installed the electrostatic precipitator system with filter efficiency of 99% and desulfurization efficiency of 95%. The results of emissions after passing through the treatment systems measured in the monitoring periods and online emission monitoring are within the limits set in column B of QCVN 22: 2009/BTNMT.
- Installed the online emission monitoring system that directly connects data with the Department of Natural Resources and Environment.
- Renovated the emissions treatment systems (NOx reduction) for 300MW and 330MW units.
- Developed the project to change fuel from FO to DO oil to reduce black smoke upon starting.
Pay attention to environmental protection
To protect the environment, in addition to the solutions on the management of emissions, Uong Bi Thermal Power Company also pay special attention to wastewater treatment system. The company has installed and operated a modern wastewater treatment system including a waste water treatment system with a capacity of 70m3/h, a daily-life waste water treatment system with a capacity of 10m3/h, an oil-contaminated wastewater treatment system with a capacity of 10m3/h.
Thanks to the modern system, all waste water is treated with QCVN 40:2011/BTNMT before being discharged into the receiving water of Uong and Sinh rivers. Uong Bi Thermal Power Company has performed very well and achieved certain results on the management of ash and slag. The ash and slag produced in Uong Bi Thermal Power Company consisted of bottom slag and fly ash. The ash and slag are collected by the Company in two ways: wet transport to the slag slurry by steel pipes and dry discharge along the slag slurry into specialized cars for reuse, the remaining part is stored in the slag slurry and not discharged into the environment.
The ash and slag of Uong Bi Thermal Power Company was analyzed and evaluated that they didn’t contain hazardous ingredients and met the standards for reuse as building materials.
The Company managed the ash and slag according to the guidelines in Decision 452/QD-TTg of the Prime Minister on measures to manage and use the ash and slag of thermal power. According to a report by Uong Bi Thermal Power Company, it is estimated that in the first eight months of 2017 the ash and slag contents were 197,653 tons, which was transferred to the units with total volume of 141,863 tons.
It is expected that in the last four months of 2017 will be about 60,000 tons and transferred to the units about 40,000 tons. The ash slag at the slag slurry was contracted by the Company and An Khanh Joint Stock Company for use and management and ensuring the quality of the environment. Dry fly ash is transported by tankers by road used for cement additives which are managed by the Company under contracts with An Khanh Joint Stock Company and An Phu Joint Stock Company.
What Uong Bi Thermal Power Company is doing to provide power and protect the environment will be important in attracting investors involved in ash and slag handling, environmental protection, and at the same time putting the processed fly ash into materials for the production of eco-friendly building materials.