Imprities in Water 060401f Flashcards
What term is used to describe how many milligrams of a substance are in one litre of water?
Parts per million (ppm)
Water quality features can be placed into one of what three catagories?
Physical
Biological
Chemical
Pure water should be what?
Tasteless, colourless and oderless
Scientists have devised a method of determining whether water has been contaminiated with sewage by identifying and measuring certain bacteria called what?
Fecal coliforms
What metals are considered inorganic pollutants?
Mercury, lead, arsenic and cadmium
What is the reccomended water supply testing frequency for residential or agricultural applications?
Annually
What are the 2 different forms of water testing?
Chemical and bacterial
Wayer samples should be taken where?
As near to gue source as possible
H2S water testing should be performed where?
Onsite for acurrate results (gas disipates)
What is thr acceptable PH range for drinking water?
6.5-8.5
What are the most common elements thsy cause water hardness?
Calcium and magnesium
Soft water is defined as water having a hardness of less than?
1 gpg
What is the maximum amount of iron that can be removed by a softener?
3 ppm
Iron content in drinking water should be less than what?
0.3 ppm
Chemical free filters facilitate the removal of iron by introducing a small amount of air into the system using a what?
Hydro charger
What is required for the rejuvenation of ghr filter media in a chemical free iron filter?
Nothing is required
What kind of filter is more effective on higher concentrations of iron in water?
Chemical free iron filter
Correction of acidic water can be accomplished by using what?
Either neutralizing filters or a soda ash feeder
In applications where TDS levels are high, what can be done to significantly increase water quality?
Demineralization or distillation
Bacteria thrive best in waters with what pH range?
6.5-7.5
