Continuous bench-scale simulations


With AnoxKaldnes bench-scale simulations, tailor-made processes can be developed for complex wastewaters. Our long and wide experience from bench-scale testing gives us an advantage in operation and evaluation of the tests. Although, our tests are made on a routinely basis, every test is unique with different questions to answer. The focus on each test is the client’s needs.

Simulation of biological treatment processes

The general degradability of a wastewater can easily be assessed in a batch test, but the true performance of a full-scale plant can only be evaluated in a continuous flow test where almost all operational parameters can be simulated. A bench-scale simulation is a fast and easy way to gain information about the true biodegradability of the wastewater. The selected microorganisms are the same whether they are cultured in a volume of one litre or thousands of cubic meters.

In our lab we have the expertise and all equipment ready to start up a new bench-scale test within a few days after receiving the wastewater. The volumes of the reactors are chosen from 250 ml to 5 L depending on the characteristics of the wastewater. Temperature, pH and oxygen concentration are controlled within the acceptable ranges for the specific test. Status reports are delivered at request and the results from the test are presented in a final report.

AnoxKaldnes bench-scale testing can be used for:

  • Assessment of long-term biodegradability
  • Design verification
  • Process optimization
  • Trouble-shooting

Bench-scale trials based on MBBR technology

For wastewaters that contain organic compounds that are toxic or difficult to degrade, MBBR is an advantageous biological process. In the biofilm it is possible to develop a specific microflora, adapted to grow on specific compounds.

In several cases, AnoxKaldnes continuous bench-scale trials have shown that seemingly non- degradable organic compounds can be efficiently removed in an MBBR process with an adapted biofilm. Toxic compounds that have proven to be biologically degraded in MBBR processes are for example cyanide, formaldehyde and chlorophenols.

Characteristics determined:

  • Wastewater biodegradability
  • Organic load
  • Retention time
  • Sludge characteristics
  • Nutrient removal
  • Nutrient dosage
  • Effect of process disturbances

Over the years we gained a vast experience of examining different industrial wastewaters, such as:

  • Pulp & Paper
  • Chemical
  • Oil & Gas
  • Pharmaceutical
  • Food & Beverage
  • Leachates
  • De-icing
  • Mining
  • Power

Bench-scale simulation of other biological treatment processes

Other types of biological processes, such as activated sludge processes, can also be simulated, either in combination with MBBR process or as a stand-alone process.

Bench-scale simulation of biogas processes

AnoxKaldnes has long experience of performing continuous trials of biogas processes (sludge or co-digestion), which can be used for instance for optimization and to investigate biogas yields and quality of digestate. The trials are tailor-made to simulate the full-scale of choice.