Environmental Health — Flashcards

Flashcard 121: 3323f70f79e14b3cbe3e2902781bf872-ao-2

Answer: sand filters

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Flashcard 122: _____ index measures particulate matter in air

Answer: Soiling

Extra: The Soiling Index (also known as the Coefficient of Haze) is an indicator used to measure the density of suspended particulate matter (specifically smoke) in the air. Grit and dust are typically measured using a deposit gauge and expressed by weight, rather than an index.

Flashcard 123: Identify this apparatus used for water disinfection: _____

Answer: Horrock's Apparatus

Flashcard 124: b0ea78eb314b441cb9f15880b58291d2-ao-3

Answer: excreta disposal in unsewered areas

Extra: 

Flashcard 125: bleaching powder gives _____% chlorine

Answer: 33

Extra: 

Flashcard 126: b0ea78eb314b441cb9f15880b58291d2-ao-1

Answer: excreta disposal in unsewered areas

Extra: 

Flashcard 127: High test hypochlorite (HTH) contains _____% available chlorine

Answer: 60-70

Extra: High Test Hypochlorite (HTH) is more stable than bleaching powder and contains 60-70% available chlorine. Bleaching powder contains approximately 33% available chlorine.

Flashcard 128: Mercury waste should be _____

Answer: collected separately and returned to the manufacturer

Extra: According to Bio-Medical Waste Management Rules 2016, mercury waste (from broken thermometers, BP apparatus) should be collected separately and sent back to the manufacturer/vendor for recovery. It is not placed in yellow bags (which are for other chemical wastes) because mercury is a heavy metal that shouldn't be incinerated.

Flashcard 129: _____ filter is choked most commonly in RO filters

Answer: carbon block

Extra: 

Flashcard 130: _____ is the indicator used in Horrocks apparatus

Answer: Starch iodide

Extra: Horrocks Apparatus is used to estimate the dose of bleaching powder required for disinfection of water (Chlorine Demand).