Laboratory Tests

At the Hamburg location, ULTRAWAVES has set up its own laboratory to satisfy specific requirements of its customers. As a result, we are able to provide you with reliable information on the effect of our high-power ultrasound systems on aqueous suspensions (e.g. biomass, sludge) or other feasible applications in industry.

This usually requires a preparation phase during which the appropriate samples are sonicated with variable ultrasound energy input, in order to define the optimum ultrasound setting for the planned practical operation. Our high-power ultrasound systems normally operate with a frequency of 20 kHz or 35 kHz, as the required cavitation effect can be most effectively produced within this frequency range.


Accordingly, the following ultrasound units are permanently available in our laboratory:

  • Ultrasound oscillating unit 20 kHz frequency, 1 kW output, 25-50W/cm2 intensity
  • Ultrasound oscillating unit 35 kHz frequency, 0.8 kW output, 60-120W/cm2 intensity

These oscillating units correspond to those installed in our standard Ultrawaves units. Special applications for fundamental studies require a wider range of frequency. To this end we are equipped with a range of laboratory ultrasound units, which cover the wide frequency range between 40 kHz and 3,200 kHz (ELAC Nautik).


The sonication of all kinds of suspensions leads to a reduction in the suspension‘s viscosity. This is often a very welcome effect, as the mixing in digester tanks or fermenters of biogas plants is significantly improved as a result. We use a rotational viscosimeter (Bohlin Instruments) to verify this positive effect.

Particle size distribution

Sonication causes a change in size distribution of the particles or flocks in suspensions. On request, we analyse the particle size distribution using a particle analyser CIS 100 (Galai).

Methane potential

The AMPTS methane potential test system enables automated recording and evaluation of biogas volumetric flow rates, which are produced during the anaerobic degradation of different substrates. The parameters measured are gas production (biogas or methane) and the substrate degradation rate. From this we obtain information about the biogas potential of the substrates and determine the comparative increase in biogas yield as a result of the ultrasound treatment (AMPTS, Bioprocess Control).

Dry solids, chemical oxygen demand, nitrogen concentration

We routinely determine water chemistry parameters of the samples according to DIN 38414: Dry solids and volatile solids concentration. Chemical oxygen demand (COD) and nitrogen concentration are determined by photometry.

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