Browsing Google Patents can be fun, if you like long sentences… It also sometimes reveals a hand-drawn Sankey diagram, like this one:

This is from a patent filing EP 0494399 A1 on “Process to direct and treat production waters in a paper factory with installation for treatment of waste paper” by German inventor Wilhelm Menges.

The diagram is for a paper recycling process. The “thickening filtrate arising from the dispersion of waste paper is directly fed to a biological waste water” treatment. This reduces the COD levels.

Flow quantities are shown in printed numbers. A lot of hand-written numbers refer to process elements.

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