BVT-Merkblatt zu Abwasser- und Abgasbehandlung

Annexes
The application of Pinch Technology has succeeded in waste water savings of up to 60 %
[cww/tm/86]. Performance examples for waste water flow reduction are:
� Chemicals and Fibres 25 %
� Chemicals 40 %
� Oil Refining 20–30 %
� Coal Chemicals 50 %
� Polymers 60 %
An example of water conservation strategy is given in Abbildung 7.4 [cww/tm/86]
Abbildung 7.4: Example of Water Conservation Strategy before and after Pinch Analysis
Cost savings are not normally restricted to the water saving costs. They can be significant if
waste water reduction leads to the construction of a smaller central WWTP, makes expansion
of the existing waste water treatment facilities unnecessary or allows the expansion of production
unit capacity without hydraulically overloading the existing central WWTP. Process modification
and selective water regeneration can result in product recovery, which can be economically
profitable as well.
The major applications for Pinch Technology [cww/tm/86] are:
� to avoid production cutbacks under limited water supply conditios
� to reduce water supply costs
� to reduce capital costs of new water supply facilities (e.g. new wells or pipelines)
� to reduce capital costs of water treatment facilities
� to reduce waste water treatment costs
� to reduce sewage charges
� to reduce capital costs of expanding on-site waste water treatment facilities to meet increased
production loads or more stringent emission regulations
� to help comply with environmental regulations.
326 Waste Water and Waste Gas Treatment