Environmental Health — Flashcards

Flashcard 71: In **slow sand filters**, the thickness of the sand bed is approximately _____

Answer: 1 meter

Extra: **Sand Bed Thickness Comparison:** * **Slow Sand Filter (SSF):** ~1 meter * **Rapid Sand Filter (RSF):** 0.4–0.7 meters **Other dimensions for Slow Sand Filter:** * Supernatant water depth: 1–1.5 meters * Support gravel depth: 0.3 meters

Flashcard 72: Incineration reduces the weight of waste by _____%

Answer: 75-80

Extra: Incineration reduces volume by ~90% and weight by 75-80%. The residual ash is approximately 20-25% of the original weight.

Flashcard 73: outer wall of school should be _____ thick

Answer: 10 inches

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Flashcard 74: per child sitting area should not be <_____

Answer: 10 sq. feet

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Flashcard 75: AQI of <_____ means good air quality

Answer: 50

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Flashcard 76: _____ are segregated into the Yellow category (e) of BMW

Answer: Discarded containers of chemicals and disinfectants

Flashcard 77: _____ is liquid waste without fecal matter

Answer: sullage

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Flashcard 78: b0ea78eb314b441cb9f15880b58291d2-ao-2

Answer: excreta disposal in unsewered areas

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Flashcard 79: water is mixed with _____ in mixing chamber of rapid sand filter

Answer: alum

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Flashcard 80: sewage is _____

Answer: liquid waste with faecal matter 

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