ECIV 350 TEST 2 QUESTIONS AND ANSWERS
What affects potability in water? - Answer -Microbes, Organic and Inorganic Chemicals,
and radionuclides
What percent of the world population does not have access to safe drinking water? -
Answer -40 percent
What is the percent of sickness in the world that is caused by inadequate water supply
or sanitation? - Answer -80 percent
What are the inorganic chemicals that affect the potability of water? - Answer -
Cadmium, copper, lead and mercury
What is the goal of potable water? - Answer -To provide water that is palatable and
potable
What year was US Drinking Water Regulations with the Public Health Services Act? -
Answer -1912
What does Primary Maximum Contaminant Levels include? - Answer -Carcinogenic
compounds and Microbial Contamination
What does Secondary MCLs focus on? - Answer -aesthetic appeal
What are the sources of drinking water? - Answer -Ground water and Surface water
Where does groundwater come from? - Answer -shallow and deep wells
Where does surface water come from? - Answer -rivers, lakes and reservoirs
What are the types of treatment systems? - Answer -limited treatment, coagulation, and
softening plants
What does limit treatment plants treat? - Answer -high quality water and focus on
specific treatment issue in usually groundwater
What do coagulation plants treat? - Answer -surface water
What does softening plants treat? - Answer -hard waters, usually groundwater
What are the primary objectives for a surface water treatment plant? - Answer -remove
suspended material such as turbidity and color and eliminate pathogenic organisms.
, What are the primary objectives for a groundwater treatment plant? - Answer -remove
hardness and other minerals and eliminate pathogenic organisms
What technology is used for surface water treatment? - Answer -based on coagulation
and flocculation
What technology is used for groundwater treatment? - Answer -largely based on
precipitation
What is the purpose of coagulation? - Answer -to remove turbidity, color and bacteria
What promotes aggregation and subsequent gravity settling? - Answer -adding
chemicals to neutralize charge of particles
What are Colloids? - Answer -Small particles that are negatively charged and
considered stable because they repel
What are Coagulants? - Answer -tri-valent, non-toxic and relatively inexpensive and
insoluble in neutral pH range
What are some common coagulants? - Answer -Alum, Ferric Chloride, Ferric sulfate,
polyelectrolytes
What is the purpose of Jar Testing? - Answer -to simulate the coagulation/ flocculation
process in a water treatment plant.
What is Rapid Mixing? - Answer -used to blend chemicals (coagulants and water being
treated)
What is the generally the volume of Rapid Mix Basins? - Answer -8 meters cubed
What is the detention time and depth for Rapid Mix Basins? - Answer -often 10 sec to 5
min and 0.5-1.1 times the basin diameter
What is the purpose of flocculation? - Answer -grow flocs to promote gravity settling
and slow mixing
What is the velocity and detention time of Flocculation? - Answer -the velocity is 0.5-
1.5ft/min and the detention time is at least 20 minutes
What equation is used for Coagulation and Flocculation Basins? - Answer -
G=sqrt(W/mu)
What is the Flocculation Basin Design? - Answer -The design is based on jar test
results, using V=Qxt=Qx(theta), use CMFRs
What affects potability in water? - Answer -Microbes, Organic and Inorganic Chemicals,
and radionuclides
What percent of the world population does not have access to safe drinking water? -
Answer -40 percent
What is the percent of sickness in the world that is caused by inadequate water supply
or sanitation? - Answer -80 percent
What are the inorganic chemicals that affect the potability of water? - Answer -
Cadmium, copper, lead and mercury
What is the goal of potable water? - Answer -To provide water that is palatable and
potable
What year was US Drinking Water Regulations with the Public Health Services Act? -
Answer -1912
What does Primary Maximum Contaminant Levels include? - Answer -Carcinogenic
compounds and Microbial Contamination
What does Secondary MCLs focus on? - Answer -aesthetic appeal
What are the sources of drinking water? - Answer -Ground water and Surface water
Where does groundwater come from? - Answer -shallow and deep wells
Where does surface water come from? - Answer -rivers, lakes and reservoirs
What are the types of treatment systems? - Answer -limited treatment, coagulation, and
softening plants
What does limit treatment plants treat? - Answer -high quality water and focus on
specific treatment issue in usually groundwater
What do coagulation plants treat? - Answer -surface water
What does softening plants treat? - Answer -hard waters, usually groundwater
What are the primary objectives for a surface water treatment plant? - Answer -remove
suspended material such as turbidity and color and eliminate pathogenic organisms.
, What are the primary objectives for a groundwater treatment plant? - Answer -remove
hardness and other minerals and eliminate pathogenic organisms
What technology is used for surface water treatment? - Answer -based on coagulation
and flocculation
What technology is used for groundwater treatment? - Answer -largely based on
precipitation
What is the purpose of coagulation? - Answer -to remove turbidity, color and bacteria
What promotes aggregation and subsequent gravity settling? - Answer -adding
chemicals to neutralize charge of particles
What are Colloids? - Answer -Small particles that are negatively charged and
considered stable because they repel
What are Coagulants? - Answer -tri-valent, non-toxic and relatively inexpensive and
insoluble in neutral pH range
What are some common coagulants? - Answer -Alum, Ferric Chloride, Ferric sulfate,
polyelectrolytes
What is the purpose of Jar Testing? - Answer -to simulate the coagulation/ flocculation
process in a water treatment plant.
What is Rapid Mixing? - Answer -used to blend chemicals (coagulants and water being
treated)
What is the generally the volume of Rapid Mix Basins? - Answer -8 meters cubed
What is the detention time and depth for Rapid Mix Basins? - Answer -often 10 sec to 5
min and 0.5-1.1 times the basin diameter
What is the purpose of flocculation? - Answer -grow flocs to promote gravity settling
and slow mixing
What is the velocity and detention time of Flocculation? - Answer -the velocity is 0.5-
1.5ft/min and the detention time is at least 20 minutes
What equation is used for Coagulation and Flocculation Basins? - Answer -
G=sqrt(W/mu)
What is the Flocculation Basin Design? - Answer -The design is based on jar test
results, using V=Qxt=Qx(theta), use CMFRs
