Mercury species and potential leaching in sludge from coal-fired power plants

Emission Characteristics, Speciation, and Potential Environmental Risks of Heavy Metals from Coal-Fired Boilers: A Review

“…Statistics from MEE indicated that in 2019 the electricity and heat production and supply industry and various industrial processes produced about 540 Mt of fly ash, 320 Mt of slag, and 130 Mt of gypsum, of which 86%, 53%, and 83% of fly ash, slag, and FGD gypsum were produced in the electricity and heat production and supply industry, respectively [25]. The HMs contained in fly ash, slag, and gypsum can be released into the environment again under certain conditions during stockpiling and disposal, posing a threat to the environment and human health [26,27]. As can be seen, the environmental problems associated with HMs in wastes such as fly ash, slag, and gypsum from coal-fired boilers cannot be ignored.…”

SO2 Adsorption and Kinetics Analysis during Supported Triethanolamine Acetate Ionic Liquid Desulfurization

“…In addition, treatment and utilization of byproducts have been challenging. 9 , 10 Hence, their large-scale development and application are gradually being restricted by limited resources and environmental considerations. In particular, activated carbon has received considerable attention for application in flue-gas desulfurization.…”

“…Flue gas desulfurization (FGD) is one of the most effective methods for reducing SO 2 emission. , Currently, limestone–gypsum wet desulfurization is the most widely used and mature desulfurization technology for FGD. , However, this technology uses a large amount of limestone as an adsorbent, which is nonrenewable. In addition, treatment and utilization of byproducts have been challenging. , Hence, their large-scale development and application are gradually being restricted by limited resources and environmental considerations. In particular, activated carbon has received considerable attention for application in flue-gas desulfurization. , Although activated carbon desulfurization technology is simple and the product can be regenerated, activated carbon has inherent disadvantages (e.g., low sulfur capacity and large regeneration loss). , Therefore, a high-efficiency and high-sulfur-capacity desulfurization technology that can be recycled after use should be developed.…”

Rod-Shaped Bi2S3 Supported on Flaky Carbon Nitride for Effective Removal of Elemental Mercury in Flue Gas

“…The consumption of coal plays a promoting role in the development of the economy and technology around the world. However, many toxic substances are released during coal combustion, including gaseous pollutants (such as sulfur dioxide and nitric oxide) and heavy metals (such as arsenic, selenium, and mercury). − Among these toxic substances, Hg can pose a severe threat to the environment and human health due to its extremely high volatility, toxicity, and diffusivity. − In coal-fired power plants, mercury mainly appears in three forms of elemental mercury (Hg 0 ), oxidized mercury (Hg 2+ ), and particulate mercury (Hg p ). , The physical and chemical properties of diverse forms of mercury are different, and the methods to remove it are also unique. Among them, the existing dust removal equipment (such as an electrostatic precipitator (ESP) or bag filter (FF)) can capture most of the particulate mercury (Hg p ) in the flue gas, and the wet desulfurization device (WFGD) can remove about 90% mercury oxide (Hg 2+ ) in the flue gas .…”