Overview

Neutralizing pollutants

The waste water treatment process neutralizes waste water from wet flue gas cleaning or fly ash washing, and removes pollutants such as heavy metals, ammonia or persistent organic pollutants (POPs) from the waste streams. Since the only remaining components are neutral salts (sodium and calcium chloride), it can be discharged into a receiving watercourse.

Application

Proven process

Lime slurry is often used to neutralize acidic waste water. The pH is controlled to transform dissolved heavy metals into almost soluble substances. Induced flocculation enables the precipitation of fine dust, gypsum and settled heavy metals into a sedimentation tank and/or with filtration; this allows the separation of solids from the liquid. pH is then adjusted to the neutral range, and a second purification is carried out with specific ion exchangers and activated carbon filters. After a final quality control, the clean effluent is discharged. The sludge from the precipitation tank is concentrated and dewatered in a filter.




This figure shows a diagram of HZI's waste water treatment system