Optimization of your Wastewater Treatment Plant

The need to operate wastewater treatment plants as energy-independently as possible increases the pressure on local authorities and plant operators.

However, it is not possible to achieve this by means of the “classical” fermentation process, in spite of mature technologies. One highly efficient method is the disintegration of sewage sludge by means of ultrasound. It is precisely the ultrasonic treatment of the difficult to ferment surplus sludge which breaks up the flocculated structure and opens up the cells, resulting in a significant increase in efficiency and in process optimisation of the treatment plant.

Advantages

  • Very high energy efficiency – up to 50 % savings compared to other disintegration systems
  • Extremely low-maintenance plant technology
  • High degree of operational reliability
  • Long standing times
  • Can be ideally adapted to the respective requirements
  • Lower space requirement thanks to compact design, simple plug & play installation
  • Quick pay back

 

Disintegration by Ultrasound

Disintegration is the breakdown of biogenic sludge into minute particles by external forces.

The resulting increase in surface area causes an acceleration of the organic breakdown process, and thereby results in an increased biogas yield. In addition, the release of exoenzymes from the external cell layer increases the enzyme activity in the digester. In ultrasonic disintegration, the electrical oscillations created by a generator are transformed by a converter (sonic transducer) into mechanical vibrations. These vibrations are transferred into the surrounding medium by means of a device known as a sonotrode. Following the rhythm of the ultrasonic frequency, they cause high alternating positive and negative pressure phases, depending on whether the oscillator is expanding or contracting at the time. During the negative pressure phase, microscopical cavities are formed in the liquid exposed to the ultrasonics; these then collapse in the subsequent positive pressure phase.

This process is known as cavitation. From the implosion, which releases high pressures and temperatures, strong impact and shear forces occur in the area immediately around the cavities, and these cause the surrounding micro-organisms to disintegrate.The core of the DesiUS is the ultrasonic technology from Weber Ultrasonics. The BioPush reactor developed specifically for the treatment of biogenic slurries fulfils the demanding requirements of the disintegration process, and in many aspects is significantly better suited than the usual rod transducers or sonotrode technology.

DesiUS – The “TURBO” for your Digester Gas Plant

DesiUS (Disintegration Ultrasound System) represents energy-efficient and process robust cell opening technology

The term “DesiUS” stands for “disintegration ultrasound system”. The disintegration process which forms the basis of DesiUS was developed by Weber Ultrasonics in collaboration with the Fraunhofer
Institute and was optimised by Weber Entec through the use of the BioPush reactor. DesiUS represents energy-efficient and process-robust cell opening technology combined with exceptionally high efficiency. The robust and completely maintenance-free construction of the BioPush reactor allows a simple and uncomplicated structure. In principal, a macerator is installed upstream of the turnkey plant. On the one hand, this protects the entire plant from foreign bodies, and homogenises the substrate, in order to achieve the optimal exposure to the ultrasonic waves. The substrate is
passed through the reactor(s) at a specific velocity by means of screw pump, to achieve the optimum specific energy input for the treatment of the substrate. A PLC control system provides user-friendly, robust, and trouble-free operation.




The plant consists of a macerator, a screw pump, in this case six ultrasonic reactors, flow quantity measurement devices, and pressure and temperature sensors (two each). The control cabinet with the PLC control system may be installed in a remote location, or directly on the plant.