Corrosion

Bromine (Br₂), Chlorine (Cl₂), Fluorine (F₂), Hydrogen Sulfide (H₂S), Sulfuric Acid (H₂SO₄), Hydrogen Bromide (HBr), Hydrogen Chloride (HCl), Hydrogen Cyanide (HCN), Hydrogen Fluoride (HF), Nitric Acid (HNO₃), Ammonia (NH₃), Mercaptan, Dimethyl Sulfide, Oxides of Nitrogen (NO_x) and Oxides of Sufur (SO_x).

Chemical Process(Chemical Plants, Fertilizer, Food, Pharmaceutical, Pulp and Papers), Metal Works (Foundry, Cleaning, Pickling, Galvanizing and Plating) and  Flue Gas Treatment(Boiler and Incinerator)

This class of pollutants is typically removed using an aqueous solution in a packed scrubber (vertical or horizontal). Depending on the specific contaminant and concentration, additional neutralizing chemicals such as NaOH (sodium hydroxide), KOH (potassium hydroxide), NaOCl (sodium hypochlorite), H₂SO₄ (sulfuric acid), Na₂S (sodium sulfide) and others may be required to aid absorption and create a more desirable by-products. Other scrubbing equipment such as sieve tray towers and eductor venturis can also be used alone or in conjunction with packed scrubbers for special applications requiring product recovery or small exhaust volumes.

Aerosols as extremely fine liquid droplets can be formed from gas phase hydrolysis of halogenated acids (HCl, HF, HBr), metal halides, organohalides, sulfur trioxide (SO₃), and phosphorous pentoxide (P₂O₅). Entrained liquid droplets are much larger than aerosols and are usually produced by drag-off or collection from a processing tank involving dipping or mixing operations. Typical examples are sulfuric acid (H₂SO₄), nitric acid (HNO₃), and sodium hydroxide (NaOH) from metal finishing/cleaning operations.

Mixing Process(Chemical Plants), Aeration(Wastewater Treatment Plant), Paint Spray (Automotive), Metal Works (Cleaning and Plating)

Shallow packed bed scrubbers and standalone or integrated mist eliminators modules are typically used for droplet removal. Aerosols cannot be removed using traditional packed scrubbers. Proper equipment selection for this type of application depends on the specific contaminant and exhaust volume and includes fiber-bed mist eliminators, high efficiency aerosol filtration and venturi scrubbers.