Food Processing Industry

Effluents from the food processing industry, for example potato and vegetable wash water can be purified and circulated.

Prior to the sale or further processing, vegetables and potatoes have to be washed. During the washing process, soil and sand particles as well as peeling and root rests enter the washing water. By continuously removing dirt particles, the majority of the water can be circulated. Drinking water is only used for the last rinsing step.

The water treatment can be done in three stages. In the first step, rotation screens remove larger particles, e.g. root rests. Soil particles are separated by sedimentation using a lamella separator. Finally, the sludge can be thickened by a dewatering container (with small quantities) or a chamber or belt filter press. The sludge can be spread on fields. Procedural stages, as for example, disinfection of water can be added if needed.

Processing of potatoes

Starchy water occurs during the processing of potatoes. Due to its weight starch settles in the water, similar to soil. This means that lamella separators can be used for this application as well. Dewatering of the starch-sludge can be done afterwards e.g. by a decanter or filter press.

Fruit and Vegetable production

Large amounts of COD containing effluent occur during the production of fruit and vegetable products. The most widespread treatment process is the biological purification. A disadvantage of this treatment process is that the higher the COD-load, the higher the operational costs of the plant. Further problems are the heavily fluctuating forms and amounts of pollution, which may lead to major disruptions in the biology. A decrease and equalisation of the COD-load can be achieved through the use of a lamella separator.

Not only before, but also during biological processes, separation of particles or flocks can be useful. For example, it is important for biological processes, that the majority of the sludge (whether activated or anaerobic sludge) is held back. Through the use of a lamella separator up to 85% of the required space can be saved, when compared to a conventional settling basin. This is achieved through the inclination of several parallel lamellas which offer numerous sedimentation surfaces within a small space.

Washing water from washers and canteen kitchens

A further application is the treatment of washing water from washers and canteen kitchens. When the hot and fat-containing effluent is discharged without treatment, the fats form sediments in the canalisation. Furthermore causes the heavy COD-load high wastewater costs. The fats can be filtered out by a lamella separator after a precipitation process. Other dirt particles are separated by the lamella separator as well.

As varied as the dirt particles are, as varied the treatment technologies have to be.

Advantages:

  • optimised washing effect through clean water, improved product purity
  • increased process stability, failure-free operation
  • reduced fresh water usage= reduced costs
  • reduced wastewater pollution and costs
  • minimum energy and chemical consumption
  • low maintenance-, operation- and cleaning-effort
  • compact design, little space required

The main assembly for the treatment of washing water and effluent is the lamella separator. As the effluent flows through the lamellas, particles settle onto the lamellas (sedimentation), slide down into the sludge funnel and can be exported. The purified water leaves the assembly by passing a weir on the top.

The following appliances of our product range can be used in accordance with the application:

- Inclined filter, continuous and vacuum belt filter

- Rotations screen

- Solids separator.

In addition to supplying in-house manufactured appliances, Leiblein GmbH also offers installation of complete plants and other components (e.g. sludge presses). Due to our many years of experience in the fields of effluent and process water treatment, we are your competent partner.

Our references

In the following, we would like to give you an overview of projects we have implemented in the recycling industry. If you require any further information or explanation, please do not hesitate to contact us.

Leiblein-GmbH – washing water-solutions for the food processing industry

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Pilot Plants

Customer-specific pilot
plants for testing purposes.