The Sea-FGD system or electrostatic precipitators is used in burning stage. That is one of the system is widely used in many developed countries in the world. Sea-FGD system can filter 99.7% filtration of dust escaping from the flue-gas stack. So far, Vietnam Electricity electrostatic precipitators system installed in all thermal power plants across the country. In particular, at two thermal power plants: Duyen Hai 1 Thermal Power Plant and Vinh Tan 2 Thermal Power Plant, the electrostatic precipitators are installed on the  flue-gas stack at a height of 210m. The amount of dust emissions only 0.03%, that means the gas almost has no impact to the ambient air environment and the  local people's life.

The Sea-FGD system has the disadvantage of not being able to filter the gas by burning FO and HFO. Therefore, some plants of Vietnam Electricity, including Duyen Hai 1 thermo power, have upgraded the technology and converted into using diesel oil fuel. The exhaust after the electrostatic precipitators has met the standard of the National Technical Regulation on Industrial Emission QCVN 22: 2009.

SO2 can also be handled by the Sea-FGD technology, but instead of using limestone to remove the technology they use another effective source, the seawater which brings the higher processing, making solid waste reduction and high effective economic. In addition, the seawater which is out from reducing SO2 process, can be reused for creating products that have sulphate in their ingredient and harmless to the environment and organisms.

The 2 thermal power plants: Duyen Hai 1 and Vinh Tan 2 are invested to install the Selective Catalytic Redution (SCR) for treating NOx. This modern technology allows the high control level of NOx to meet the requirements standard.

Duyen Hai 1 thermal power plant has the SO2 emission under 350 mg/Nm3, NOx emission under 700/Nm3, ensuring Vietnam's regulations. Currently, emissions at the power plants is measured continuously by analytical equipment, automated emission monitoring (CEMS), and frequently Resources and Environment Department of the provincial inspection.

Moreover, Mr. Nguyen Huu Phien, The director of Duyen Hai 1 thermal power plant said: "The installation of traffic online to coordinate continuously with authorities, monitoring emissions at all times in accordance with paragraph 1, Article 47, Decree No. 38/2015/ND-CP dated 04/24/2015 of the Government Minister of Administration and scrap waste. This is a job for transparent information and help authorities and people can easily monitor, control 24 per 24 hours and believe in the quality of the plant's emissions.

Vietnam Electricity has met the wishes and expectations of local governments as well as people in the organization of supervising exhaust treatment at their power plants. This helps to ensure the quality of the environment and shows the responsibility and obligation of the thermal power plants to ensure environment qualities.