Mercury Emission Removal from Gas Streams
Mercury emissions from coal-fired power plants, industrial boilers, waste incinerators and chlor-alkali plants have been a major environmental concern over the last two decades. While mercury is a lethal air pollutant, its main toxic effects are realized in aqueous environment. Once mercury enters water bodies, either directly or through air deposition, inorganic mercury can be converted to its most toxic form, dimethylmercury.
As a result, environmental protection agencies in the United States, China, and other countries around the world have been introducing increasingly stringent regulations limiting mercury emissions. The U.S. EPA estimates the market for upgrading coal-fire power plants and industrial boilers to meet the new Mercury regulation at approximately US$2 billion!
The Challenge of Mercury Removal
While some of the mercury forms present in flue gas emissions can be removed by conventional air pollution control technologies, its most common form (elemental mercury) is extremely difficult to remove due to its absorbing characteristics. Furthermore, its low concentration as well as the strict regulatory removal requirements, make mercury removal a challenging task. Adsorption of mercury using conventional methods such as activated carbon injection is limited, consumes high amounts of adsorption agent, as well as produces huge amounts of contaminated solids that need to be disposed.
Mercu Removal has developed a proprietary process for efficient mercury removal from gas streams. The process is based on unique mixture of ionic liquid and oxidative agent. Mercury abatement is attained by oxidizing the mercury, which than bounds as a stable complex in the absorption liquor. The system removes all mercury species, including elemental mercury, in rates higher than 95%. The novel absorption system exhibits a remarkable mercury concentration factor of seven orders of magnitude. The final solution may hold up to 50% (w/w) mercury in the ionic liquid without damaging its absorption characteristics. Upon exposure to reducing salt, the metallic mercury swiftly precipitates from the solution and could be quantitatively separated and collected, while the ionic liquid solution can be recycled easily and reused in the process
About Mercu Removal Ltd.
Mercu Removal Ltd. was founded in 2015 within Hutchison Kinrot, a leading environmental technology seed investor, owned by Hutchison Water of the Hutchison Whampoa Group Ltd. Company holds exclusive license from the Hebrew University in Jerusalem to commercialize the technology for mercury removal from gas streams. The technology has been developed by the research group of Prof. Yoel Sasson, a worldwide expert in applied green chemistry.