Question on Grinder - Githubissues

QSD-Group / QSDsan

Quantitative Sustainable Design (QSD) of sanitation and resource recovery systems.

https://qsdsan.com

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Question on Grinder #66

Closed yalinli2 closed 2 years ago

yalinli2 commented 2 years ago

Can grinder remove moisture? If so, should include in the description of the class, right now it only says it breaks up the solids
- Then where does the water go? There's only one influent and one effluent
- The calculation here is assuming a moisture content of 65%, not 35% https://github.com/QSD-Group/QSDsan/blob/e9fdbf1e6ed25685ce31093f5a58eced6c5eabc7/qsdsan/sanunits/_grinder.py#L94
Is price_ratio needed here?

yalinli2 commented 2 years ago

Grinder cannot remove moisture, but have to make the assumption here for the system to run properly, the moisture content should be 65%

yalinli2 commented 2 years ago

price_ratio was not added because this system is highly specialized, so the price shouldn't be adjusted based on the where the system is implemented.

yalinli2 commented 2 years ago

Parts that might be built with the deployment country: grinder, screw press (i.e., pretreatment/side treatment units), but not the biogenic refinery system

lsrowles commented 2 years ago

The grinder is only used to break up the solids from UDDT into smaller pieces. The assumption for moisture content is only so the system can run properly. These assumptions seem to be reasonable based on the pilot studies (other inputs with higher moisture content may require additional water removal).

yalinli2 commented 2 years ago

Default moisture content has been updated to 65% in the gates branch, a note was added in the documentation of this unit about this assumption.

Refer to #54 for the discussion on the price_ratio