What evidence suggests that various entities were concurrently developing distinct nutrient recovery methods?

Answer

The existence of European patent filings, such as EP2580167A2.

The existence of European patent filings related to nutrient recovery indicates that various engineers and entities were concurrently developing distinct methods to solve the shared problem.

What evidence suggests that various entities were concurrently developing distinct nutrient recovery methods?

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Innovative nutrient recovery systems Marieke Verbeke #VCM

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