lect 18 part 2 Flashcards
what is the overview of this lecture?
-lecture 17 (completed discussion of phase interactions and literature reading discussion)
-chapter 7/8 water pollution and water treatment
-water pollution (chapter 7): self directed
-lecture 18: water treatment (chapter 8)
why is this reaction important?
CaOCl2 is made up of the calcium salts of hypochlorous acid
-It is produced by dissolving chlorine gas (Cl2) into a solution of calcium oxide (CaO) and sodium hydroxide (NaOH)
what are the three major categories of water treatment and water use?
-purification for domestic use (drinking water)
-treatment for specialize industrial applications (microchip fabrication)
-treatment of wastewater to make it acceptable for release or reuse
how does beer relate to our discussion of water treatment?
what ion exchanger (replacement)?
what is CEC?
Cation exchanger capacities (CEC) of various types of materials found in colloidal size fractions of a sample in the environment
what is the example of CEC?
what is the treatment of water (drinking water)? what needs to be treated or removed?
what needs to be treated or removed?
-volatiles: hydrogen sulfide (H2S), methane (CH4), bacterial metabolites
-solids: suspended particulates and colloids
-excess water hardness
-excess iron and manganese
-dissolved organics
-pathogens: bacteria, viruses, etc.
categories of treatment: depends on final use
-drinking water
-industrial use
-release of water back to environment
what are water quality guidelines?
-physical properties of water
-general chemical properties: pH, salinity, hardness, etc.
-specific elements, complex ions and organics
-radiological properties
-microbiological properties i.e. counts of specific organisms
what are some trace pesticides?
what are the WHO guidelines for drinking water quality?
what is the schematic diagram of a typical municipal water treatment plant?
what is the saskatoon water treatment process?
what are the steps in water treatment?
A- primary settling
B- aeration
C- removal of excess hardness, Fe, and Mn
D- coagulation
E- disinfection
