Record Details
page 6
Digital Collections at BYU
| Field | Value |
|---|---|
| Title | page 6 Newsletter 1983 Fall, page 6 |
| Coverage | Electronic reproduction; |
| Format | 6 text/PDF |
| Rights | Brigham Young University; http://lib.byu.edu/about/copyright/generic.php Public Domain Public |
| Language | English; eng; en |
| Relation | Central Utah Project; Western Waters Digital Library; CUWCD newsletter treatment of surface water by carl H carpenter PE water supplies occuring curing occurring oc in streams lakes and reservoirs must go through a treatment process if they are to be used for culinary purposes such surface water sources are exposed to bacteriological and physical contaminants which it not removed by a treatment process make them unsuitable for drinking and other domestic purposes the treatment process is basically designed to remove the physical and bacteriological contaminants and render the water safe for human use the first step in treatment is to remove all large floating material by a screening process if the supply is taken directly from a reservoir this step is generally unnecessary after the large materials are removed the water still contains particles in suspension too small to settle out without some form of treatment A chemical coagulant is added to the water and rapidly mixed the coagulant is usually alum or ferric chloride which are harmless in the low dosages normally used small particles called floccs flocca form as the chemical is mixed with the water and these become larger through gentle agitation in a flocculation basin the flocc floca particles ultimately get large enough to attach themselves to the suspended matter in the water and then begin to settle out in a quiescent chamber called a sedimentation basin the clarified water is then drawn off and conveyed to basin containing filter media composed of specifically graded sand and anthracite coal which filter out any remaining small particles the water emerges from the filters sparkling clear but still may contain microscopic size bacteria A disinfectant normally chlorine in small doses is injected which kills any remaining bacteria thus the water has been cleaned and disinfected infected disinfecter dis and if forwarded on to the consumer safe to drink sometimes the water has a taste or odor especially those supplies which are taken from lakes or reservoirs servo irs tastes and odors are removed by the addition of small dosages of potassium permanganate or powdered carbon the potassium permanganate oxidizes tastes and odors and the carbon has the property which absorbs tastes and odors other chemicals are sometimes added to aid in the formation of the floccs flocca and also to improve the filterability of the water these are known as glassy polymers or polyelectrolytes 4 clr T 7 X rim rip after the filters have been in use for a period of time they gradually become clogged and must be cleaned this is done by reversing the flow with clean water and is called backwashing through this process the reverse flow fluidizes fluid izes and expands the filter media and agitates it to clean out the accumulated material after about 10 minutes the reverse flow stops the cleaned filter media settles back in place and is ready for another filtering cycle the used backwash water is captured in a settling basin where the dirt or sludge settles out and the clear water is introduced back at the beginning process to be treated with the incoming water thus very little is wasted the harmless sludge and dirt are conveyed to drying beds and ultimately hauled away to landfills land fills WATER TREATMENT BY THE CENTRAL UTAH WATER conservancy DISTRICT the central utah water conservancy ser vancy district is the sponsor of the central utah project it has the responsibility to market the water made available from the project to those needing it for irrigation municipal and industrial uses the water for municipal use must meet the safe drinking water standards for culinary purposes thus the surface water supplies of the project scheduled for municipal use must receive the proper treatment for those water subscribers which do not have treatment facilities the district has constructed and operates three water treatment plants these plants treat not only central utah project water but surface water supplies owned by |
| Identifier | http://cdm15999.contentdm.oclc.org/cdm/ref/collection/WesternWatersProject/id/1279 |
