1.1 Acidic and alkaline dust can be corrosive. When a dry dust collector is used, the materials of components exposed to the contaminated air must be selected according to the corrosiveness of the process, which may increase equipment cost.

1.2 In suitable applications, a wet dust collector can capture dust while the circulating water helps absorb or dilute water-soluble acidic or alkaline contaminants. A chemical dosing system can also be added when pH adjustment or neutralization is required.

1.3 Wet dust collectors are particularly suitable for dust that is water-soluble, readily wetted, or can be separated from the circulating water by settling or filtration.

1.4 If lightweight particles remain floating on the water surface instead of settling, a floating residue removal system and an external water filtration unit can be added. The separated water can then be returned to the circulating water tank.

1.5 Depending on the type and concentration of the corrosive contaminants, wet dust collectors can be manufactured from suitable corrosion-resistant materials, including stainless steel such as 304 or 316L where appropriate. Automatic chemical dosing and pH monitoring systems can also be added when required by the process.

1.6 The circulating water should be monitored and replaced or treated as required. When neutralization produces dissolved salts or suspended solids, additional water treatment equipment such as sedimentation, filtration, or a filter press may be used to separate solids and allow suitable water to be recirculated.

1.7 For applications involving humid air, water vapor, sticky contaminants, or a small amount of oil mist, a wet dust collector may be more suitable than a conventional dry filter dust collector, depending on the specific operating conditions.

1.8 Where higher final filtration efficiency is required, additional downstream filtration stages can be considered according to the characteristics of the exhaust air and the required emission level. The final system configuration should be selected based on the actual process conditions and local emission requirements.