Block Flow Diagram

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Team Delta's Block Flow Diagram
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Block Flow Description
Whey: Whey is the liquid left from milk after cheese making. It is a renewable and abundant resource obtainable from cheese and other dairy factories.

Ultra Filtration: The whey is then ultra filtrated into either a liquid or solid whey permeate.

Whey Permeate: Whey permeate has higher concentration of lactose and a lower concentration of protein that unfiltered whey, making it suitable for fermentation.

Fermentation: Lactobacillus helveticus is a common bacteria that will anaerobically ferment the lactose of the whey to lactic acid. The whey permeate will be fermented in a continuous reactor, and the cells will be recycled to ensure completion of the fermentation.

Additional Filtration: Once fermentation is complete, the end product will be filtered again to separate the lactic acid from waste product.

Polymerization: The lactic acid will repeatedly go through a homo-catalytic polymerization reaction until the polylactic acid (PLA) has reached a desired molecular weight between 60,000 and 100,000 g/mol.

The PLA is then ready for production of biodegradable garbage bags.