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REHS Exam: Private Onsite Wastewater Treatment and Disposal Exams $14.29   Add to cart

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REHS Exam: Private Onsite Wastewater Treatment and Disposal Exams

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Biochemical Oxygen Demand (BOD) The difference between the initial dissolved O2 in a water sample and dissolved O2 in a duplicate sample after a stated period of time (usually 5 days). Best single measure of wastewater or polluted water. Chemical Oxygen Demand (COD) A measure of the amount of ...

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  • April 24, 2023
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  • 2022/2023
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