Liquor Concentration and Chemical Recovery

for Pulp & Paper Manufacturers

A Leader in Evaporation and Chemical Recovery

Veolia Water Technologies is the recognized leader for black liquor concentration and chemical recovery. Veolia's unique pulp and paper capabilities range from process design to complete turnkey installation and associated services.

We address economic and environmental challenges by optimizing mill performance, improving energy efficiency, and assisting our clients reduce the ecological impact of their activities.

Our expertise reduces water cycle costs and optimizes water consumption per ton of pulp and paper produced.

Capabilities to Improve Liquor Concentration & Chemical Recovery

HPD® Black Liquor Concentration

The thermal treatment of black liquor through evaporation achieves higher solids content and lower loads to the recovery boiler leading to the optimization of combined heat and power production. When integrated within the chemical recovery cycle, this technology promotes higher operational efficiencies while enabling the reuse of high-quality condensate.

Precipitator Ash Treatment

With the closing of process loops, chloride and potassium accumulate in the recovery cycle and result in scaling and corrosion in the boiler. 

Using highly-selective crystallization technologies, these non-process elements (NPEs) are removed while sodium is recovered to maximize soda chemical savings.

Pulp & Paper Case Study

Leading Containerboard Manufacturer


  • Black Liquor Evaporation
  • Chloride Removal System


  • Virginia (USA)

Project Information:

An existing containerboard manufacturing facility needed to replace the existing three evaporator trains at the facility. The project scope included construction of a six-effect, HPD® falling film evaporator train that produces 74% product solids at an evaporation rate of 897k lbs/hr (407 t/h). Veolia also installed a CRPTM (Chloride Removal Process) System to successfully process precipitator slurry to protect downstream utility equipment from scaling.