The Source-Sink Mapping Diagram

Identify all water discharge and water usage streams. 

Separate streams into sources, wastewater that can be potentially recycled, and sinks, water usage streams that can potentially accept a portion of recycled wastewater. 

Obtain flow rates and compositions of sources and sinks. 

Generate the Material Recycle Pinch Diagram containing source composite curve and sink composite curve. 

The pinch point(s) divides the network into water recycle sub-networks. No waste should be discharged from sources below the pinch. No freshwater should be used in any sink above the pinch. 

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On the source-sink mapping diagram, sources are represented by shaded circles and sinks are represented by hollow circles. Typically, process constraints limit the range of pollutant composition and load that each sink can accept. ITie intersection of these two bands provides a zone of acceptable conqKisition and load for recycle. If a source (e.g., source a) lies within this zone, it can be directly recycled to tiie sink (e.g., sink S). Moreover, sources b and c can be mixed using the lever-arm principle to create a mixed stream that can be recycled to sink S. 

The source-sink mapping diagram can also be used to determine the extent of interception needed. If a source lies to the right of a sink, it can be intercepted to render it within the band of acceptable recycle. The problem of simultaneously... 

Let us first segregate the two sources forming the feed to the incinerator. As can be seen from the source-sink mapping diagram (Fig. 9.20), the gaseous emission from the ammonium nitrate process (R2) is within the acceptable zone for the incinerator. Therefore, it should not be mixed with R] then separated. Instead, the ammonia content of Ri should be reduced to 0.10 wt% then mixed with R2 to provide an acceptable feed to the incinerator as shown by Fig. 9.20. The task of removing ammonia from Rj to from 1.10 wt% to 0.10 wt% is identical to the case study solved in Section 9.3. Hence, the solution presented in Fig. 9.18 can be used. 

Figure 4.6 Source-sink mapping diagram for the AN case study.

Figure 6.9 The source-sink mass mapping diagram.

Analyze the Residual Mass Mapping Diagram to choose the next source and sink matching. 

Draw the Residual Mass Mapping Diagram as shown in Figure 6.A.8 with the selected source-sink match identified in step 12 eliminated. Analyze this diagram using step 11 to choose the next source and sink matching... 

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