Liquid Waste Reduction and Recovery


Swenson has been designing and building systems to handle waste streams for many years. Our tremendous experience, coupled with our commitment to staying at the forefront in research and development, has enabled Swenson to develop a wide range of systems to process liquid waste and deliver usable byproducts.

Design Features

  • Reduce solutions to more manageable volumes or concentrations
  • Purify waste streams by crystallization or evaporation
  • Carry out neutralization reaction digestion type operations
  • Condense and collect process vapors
  • Convert solutions, slurries or wet solids into dried products
  • Achieve partial separations through crystallization
  • Separate solids from slurries by filtration or centrifugation


  • Volume reduction can significantly lower transportation and processing costs
  • Equipment can be skid mounted for easy setup and relocation
  • Clean water can be recovered for reuse
  • Usable byproducts
  • Reduction in use of raw materials due to product recovery from waste streams

Because of our extensive field experience and testing capability, Swenson has focused on evaporation, crystallization, filtration, centrifuging, heat transfer, and drying.

In designing a system for a particular application, many factors are taken into consideration. The goal of the system, whether volume reduction, separation, crystallization, purification, or product recovery, determines the system design. Following are three basic types of systems:

  • For applications requiring evaporation, an evaporator is designed to reduce solutions to manageable volumes or concentrations. Concentrated liquor is either circulated back to the process or sent to disposal.
  • For concentrated liquor that does not lend itself to crystallization but requires further processing, a spray dryer is used to convert concentrate into a dried powder, which can be used or sent to disposal.
  • For concentrated liquor lending itself to crystallization, a crystallizer produces a crystal slurry. If further processing is required, the slurry goes to a centrifuge, which produces moist crystals that are fed to a dryer producing dry crystals.