Due to the rising costs for fresh and wastewater, the treatment and reuse of low-contaminated process water
streams from food processing companies is increasingly gaining in importance. In this study it was shown that water
for reuse could be produced from this water by a specific treatment using membrane processes while achieving
reduction of water consumption and wastewater quantities. Three examples of low-contaminated wastewater will be
discussed: firstly a vapour condensate from milk processing, secondly chiller shower water from the meat processing
industry and thirdly wash water from bottle washing machines. Due to the promising laboratory and pilot-scale
experimental results, a demonstration plant with a capacity of 1-2mVh, consisting of the following stages, was set
up: pretreatment; main treatment - - 1st nanofiltration stage; post-treatment - - 2nd nanofiltration or low-pressure
reverse osmosis stage and UV water disinfection. Economical water treatment was possible in all three examples.
The treated low-contaminated process water from chiller showers or bottle washing machines was of drinking quality
and therefore suitable for reuse. Alter treatment, the vapour condensate could be reused as boiler make-up water
which is subject to higher standards than drinking water. The experimental technology underwent an authorization
procedure at the Saarland Ministry for Health, Germany, and was granted approval.
Due to the rising costs for fresh and wastewater, the treatment and reuse of low-contaminated process waterstreams from food processing companies is increasingly gaining in importance. In this study it was shown that waterfor reuse could be produced from this water by a specific treatment using membrane processes while achievingreduction of water consumption and wastewater quantities. Three examples of low-contaminated wastewater will bediscussed: firstly a vapour condensate from milk processing, secondly chiller shower water from the meat processingindustry and thirdly wash water from bottle washing machines. Due to the promising laboratory and pilot-scaleexperimental results, a demonstration plant with a capacity of 1-2mVh, consisting of the following stages, was setup: pretreatment; main treatment - - 1st nanofiltration stage; post-treatment - - 2nd nanofiltration or low-pressurereverse osmosis stage and UV water disinfection. Economical water treatment was possible in all three examples.The treated low-contaminated process water from chiller showers or bottle washing machines was of drinking qualityand therefore suitable for reuse. Alter treatment, the vapour condensate could be reused as boiler make-up waterwhich is subject to higher standards than drinking water. The experimental technology underwent an authorizationprocedure at the Saarland Ministry for Health, Germany, and was granted approval.
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