Parts cleaning

General task requirements for a recycling system for parts cleaning systems:

  • High quality rinsing baths which at the same time minimize operation and disposal costs
  • Optional : The possibility to prepare active baths

Specific customer requirements:

  • Considerable cost reduction through recycling instead of disposing wastes
  • High quality distillate, without salt or oil residuals
  • Anti-foaming agents are prevented from entering into the cycle
  • Reduction of hazardous wastes
  • Short amortisation periods
  • Distillate temperature below 35 °C

Specifics of recycling rinsing baths using evaporators:

Active baths such as degreasing and phosphating baths can be prepared along with the rinsing baths using evaporator techniques. Depending on the ingredients used, it may be necessary to adjust the pH-value.

Rinsing techniques directly influence the investment and operating costs of waste water systems. This fact is often neglected when plants are designed. Experience shows that even minor modifications and adjustments in the system can considerably reduce the amount of waste water produced. It is definitely worth considering consulting a specialist during the planning phase.

System description:

The rinsing baths are collected in a storage tank in order to be prepared. If further active baths need to be prepared, then these are fed from a second tank.

The Evaporator ET safely separates the salt, surfactants, oil and dirt from the water. The distillate is added in the last sink, usually using a circular spray nozzle, and it is then cascaded all the way into the first sink. There, the used rinsing water is removed and fed into the evaporator. Treatments such as degreasing can contain volatile hydrogens or surfactants. The residual oil separators, which are integrated into the Evaporator ET, guarantee that even minute amounts of volatile oils or surfactants are prevented from entering the cycle. The distillate which is produced during the cleaning process is reintroduced into the system in the last sink.

That which is lost through evaporation and carry-over during the cleaning cycle is replaced by reverse osmosis.

In case of high throughput or special treatments it is recommended to use the VE-recycling sinks.

The accumulation of concentrates during the preparation of rinsing baths is minimal, usually well below 5%.

System ET: Goals which have been achieved in practice

  • Considerable cost reduction through recycling instead of disposing wastes
  • Minimal operating costs thanks to extremely low energy consumption
  • Best distillate quality guaranteed by integrated residual oil separators and air ventilation systems
  • No contamination of the distillate by anti-foaming agents
  • Frequency controlled compressor motors provide for high concentration and minimal waste concentrates
  • Short amortisation periods thanks to the high efficiency of the system
  • Optimal heat recovery in the System ET means that the distillate temperature remains low. Because of this, complex procedures which (re)cool the distillate are not necessary. The evaporator system can therefore be combined with VE-plants.
MKR Metzger GmbH Recyclingsysteme  |  Rappenfeldstraße 4  |  D-86653 Monheim

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