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Exercise No. 9 : Paper recycling

Transfer the following verbal description into a BPMN:

a) First, old paper is collected and transported to the factory. Then, in the recycling plant, it is sorted by paper type. 
b) Thereafter, foreign parts are removed: this includes small pieces of plastic, paper clips and stapling pins. Then the remaining paper is shredded. 
c) Next, the shredded paper is mixed with water. As a result, a porridge is created. This is cleaned several times with sodium hydroxide solution and surfactants and the color particles are filtered out. Finally, these are removed with foam. 
d) To obtain white paper, the porridge is bleached with oxygen or hydrogen peroxide. Finally, the porridge is smoothed on sheets, dried and rolled out to form new paper. 

Solution
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