Environmental Health Flashcards
(21 cards)
What law sets general standards for effluent discharge in Sri Lanka?
National Environmental Act.
Which institute establishes national water quality standards in Sri Lanka?
Sri Lanka Standards Institute (SLSI).
What is the minimum recommended distance a protected well should be from contamination sources?
50-100 feet.
To what depth should the lining of a protected well be impervious?
10 feet.
What is the standard height for the raised parapet of a protected well?
2-3 feet.
What is the purpose of Aeration in community water purification?
To reduce odors and improve taste by exposing water to air.
What chemical is commonly used for Coagulation in water treatment?
Alum.
What type of filtration is typically used after sedimentation and flocculation in community water treatment?
Rapid sand filters.
What is the target minimum free residual chlorine level and required contact time for disinfection?
At least 1 ppm free residual chlorine with 1 hour contact time.
List three common methods for treating water at the household level.
Boiling, Filtration, Chemical Disinfection (e.g., using sodium hypochlorite).
What is the chemical name for the bleaching powder (TCL) used for well chlorination?
Calcium hypochlorite.
What is the standard dosage of bleaching powder recommended for well chlorination?
2.5 grams per 1,000 liters of water.
What primary microbiological indicator is tested to assess water safety?
Coliforms (specifically E. coli).
Name one category of chemical pollutants monitored in water quality testing.
Heavy metals (like arsenic, lead, cadmium) OR Nitrates OR Other toxic substances.
What is the target standard for microbiological quality regarding coliforms in tested water samples?
95% of samples should be free of coliforms, and absolutely no E. coli.
What is a primary role of a PHI regarding food businesses?
Inspection of food handling establishments, including food inspection and meat testing.
How does a PHI assess food establishments?
By grading trades and determining inspection frequency using the H800 form, considering factors like suitability, cleanliness, tidiness, pollution, pests (dogs, rats, etc.), and spacing.
What types of food sampling does a PHI conduct?
Formal and informal food sampling, including random sampling to ensure food quality and sampling in response to customer complaints.
What is the procedure if a customer complains about food?
The PHI takes food samples for bacteriological and chemical analysis.
What are the immediate steps when a PHI collects suspect food samples based on a complaint?
Label the suspected food samples using the proper method before sending them to the lab or MRI.
What actions might a PHI take after collecting suspect food samples, pending analysis results?
Seal the shop until the government food analysis or MRI report is released. If the report proves the food is unsuitable for consumption, the PHI reports the matter to the police.
