FLUE GAS & MERCURY: THE CHALLENGE
In many industrialized nations it is common practice to use incineration methods for waste disposal. There are also ways to recover energy from the process. However, operating an incinerator requires strict adherence to environmental regulations. Hazardous, clinical and waste to energy incinerators can benefit from our EcoSorb™ range of activated carbon. Specially designed to adsorb unwelcome airborne compounds from flue gases.

Applications and Solutions

for flue gas and mercury applications.

Hazardous Waste Incinerators

High temperature incineration is widely recognised as the most environmentally acceptable method of destroying various hazardous wastes generated in industrial processes. The licensing and regulation of hazardous waste incinerators is stringently controlled, resulting in a small number of large scale operations.  Hazardous waste will often be difficult to burn, requiring a high flue gas volume relative to the quantity of waste being incinerated.  Contamination requiring powdered carbon treatment results from the burning of liquid halogens (producing dioxins), thermometers and electrical equipment (mercury). Typical PAC dosages range from 100-200 mg/Nm3 at temperatures as high as 250C. The highly variable stream composition presents a treatment challenge in this application.  Jacobi offers both standard grades (EcoSorb™ XP series powdered carbons in the Europe and Asia regions, and AddSorb™ VQ series extruded and granular carbons worldwide) and premium materials (EcoSorb™ QS Advanta liquid phase additive and AddSorb™ VQN impregnated carbon, both designed for the simultaneous removal of both ionic and elemental mercury) for this application.

Clinical Waste Incinerators

Modern hospitals generate a substantial quantity of chemical and bio-hazardous wastes. In order to safely dispose of these materials, maximise heat recovery and minimize environmental impact, many larger hospitals operate on-site incineration plants. In common with industrial incineration units the flue gas will require treatment before being discharged to atmosphere.  Contamination requiring carbon treatment results from the burning of plastics (resulting in dioxins), thermometers, and batteries (resulting in mercury).  Mercury concentrations in this application tend to be very high.  PAC dosages typically range from 100-300 mg/Nm3 at temperatures of 130-180C.  Jacobi offers both standard grades (EcoSorb™ XP series powdered carbons in the Europe and Asia regions, and AddSorb™ VQ series extruded and granular carbons worldwide) and premium materials (EcoSorb™ QS Advanta liquid phase additive and AddSorb™ VQN impregnated carbon, both designed for the simultaneous removal of both ionic and elemental mercury) for this application.

Waste to Energy

High temperature incineration is used to dispose of domestic solid wastes, with the recovered energy used to preheat boiler feed water and provide district heating for the local area. Purification of the flue gas involves cooling to the correct temperature followed by dry adsorption.  Contaminants requiring carbon adsorption result from the burning of plastics (emitting dioxins) and batteries (emitting mercury).  Generally, the contaminant concentrations in these applications are relatively low, and PAC dosages typically range from 30-50 mg/Nm3 at typical gas temperatures of 130C.  Jacobi offers both standard grades (EcoSorb™ XP series powdered carbons in the Europe and Asia regions, and AddSorb™ VQ series extruded and granular carbons worldwide) and premium materials (EcoSorb™ QS Advanta liquid phase additive and AddSorb™ VQN impregnated carbon, both designed for the simultaneous removal of both ionic and elemental mercury) for this application.

Incinerator Type Scale of Plant Source of Contamination Typical PAC Dosage (mg/Nm3) Gas Temperature (deg. C) Notes
Hazardous Large Liquid Halogens (Dioxins), Thermometers/Electrical Equipment (Mercury) 100-200 250
  • Highly variable stream composition / concentration
Clinical Small Plastic medical instruments (Dioxins), Thermometers/Batteries (Mercury) 100-300 130-180
  • Very high mercury concentration
  • Lime added for acid gas
Waste to Energy Very Large Plastics (Dioxins), Batteries (Mercury) 30-50 130
  • Generally low concentrations
  • Lime added for acid gas

In addition to our standard activated carbons (including EcoSorbTM XP series powdered carbons in the Europe and Asia regions, and AddSorb VQ Series extruded and granular carbons), Jacobi has developed two premium products for the simultaneous removal of both ionic and elemental mercury:

  • EcoSorb QS-Advanta – liquid phase additive, which can be injected into scrubber solutions or flue gas streams
  • AddSorb VQN – powdered carbon impregnated with QS-Advanta for dry injection into the flue gas

Both of these products immobilize both forms of mercury as mercuric sulfide (HgS).  This mercury salt is extremely stable, non-hazardous, and insoluble, preventing it from being reemitted to the atmosphere and providing for safe, economic disposal as a solid waste.

For more information on how Jacobi products are used for flue gas and mercury applications please get in touch and our team will be on hand to assist.