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Water Pinch Analysis (WPA) is a systematic technique for reducing water consumption and wastewater generation through an integration of water-using activities or processes. A key target of water pinch analysis is maximizing water reuse and minimizing the amount of wastewater. Considers water reuse opportunities by carefully analyzing flows & quality of different streams.

Possible water reuse options are identified by matching different “sources” and “sinks”. “Sources” are defined as streams coming out of processes carrying, often multiple, contaminants whilst “Sinks” are streams going into processes that often have specific water quality requirements. The identified sources and sinks together with their mass flow rates and water quality data are encoded into the water pinch software and forms as a basis to starting the analysis.
Process Changes
● Replace Technology
● Modify Equipment’s operating
   conditions
Water Reuse
● Reuse wastewater from
    operation as input to another
    process
● Water Reuse reduces overall
    fresh water and wastewater
    volumes, but does not affect
    contaminant loads
Regenerative Reuse
● Treat waste water reduce
    the levels off contaminants
    and
    reuse it in other processes
● Both volumes and contaminant
    loads are reduced

Regenerative Recycling
● After regeneration, recycle
    water to the process from
    which it came.
● Recycling tends to build up
   contaminants system.
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