Flue Gas Desulfurization (FGD) involves the removal of sulfur dioxide and other acids from flue gases. Typical sources of acid gases include fossil fuel boilers, waste combustors, and other industrial applications such as refining and smelting. The Macrotek wet and dry FGD systems can achieve over 99% acid removal by using a variety of reagents, including caustic, sodium carbonate, lime and limestone, and waste alkaline solids or liquids.

Using waste products for neutralization in wet FGD will result in lower reagent utilization and reduced waste disposal resulting in significant savings in operating costs. The most common approach is to treat the flue gas in a spray tower absorber vessel. Slurry is sprayed counter-current to the gas flow.

Macrotek’s dry FGD design incorporates in-duct injection technology. A pulse-jet fabric filter is used for particulate removal and enhanced acid neutralization. Activated carbon can be added to improve mercury, heavy metal, and dioxin removal.

Macrotek’s removal technologies include:

HCl, HF, and Halides

The severity of these contaminants requires the most advanced removal and treatment technologies. Macrotek has extensive experience in designing systems that will meet and exceed customers’ requirements and regulations. In addition, the corrosive nature of these gases requires specific consideration for material selection.

Macrotek's removal technologies include:


Hydrogen Sulfide is lethal if released. Macrotek is a leader in developing advanced technologies for optimum removal and treatment. Our experience includes many installations using caustic, oxidizing reagents, catalytic and forced oxidation combination, and biofilters. Each application is unique and requires custom solutions.

Macrotek’s removal technologies include:

Ammonia and Odour

Control of emissions is often required due to the hazardous nature of the contaminant. Often, control or removal is necessary due to offensive odours. Ammonia, sulfur and other related compounds fall in these categories. Macrotek offers many control technologies to capture ammonia and other odour causing contaminants. Reagents are often used to neutralize and stabilize the by-product.

Macrotek's removal technologies include:

Particulate Matter

Regulations around the globe are becoming more and more stringent for particulate emissions. Macrotek offers some of the most efficient wet and dry technologies to meet the latest EPA, EU, and MOE standards. Often, particulate collection is combined with acid gas removal. Our most advanced wet-dry system meets and exceeds the most stringent regulations for both hazardous gases and particulate.

Macrotek's removal technologies include:

NOx and CO2

Specific industrial applications require wet end of pipe treatment for NOx or CO2. Macrotek offers absorbers utilizing various reagents for neutralization of NOx or CO2. NOx scrubbing is particularly suitable in situations where Nitric Acid can be utilized elsewhere in the plant, as it is a scrubbing product. As CO2 regulations become more stringent, methods for reducing emissions are continually being evaluated. Macrotek offers CO2 scrubbing technology which isolates CO2 in a contaminated stream to produce a pure CO2 product, making sequestration a more appealing option.

Macrotek’s removal technologies include: