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並前往https://www.in.gov/idem/cleanwater/files/wastewater_cert_study_guide_formula_sheet.pdf

Formula Sheet for all Wastewater Operator Exams ... - IN.gov

Theoretical detention time of a pond, days = Volume of the pond, MG. Flow rate, MGD. F011. Removal efficiency, % = 100% ion concentrat. Influent.

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