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WorksheetsNational University Quiz
Total questions: 25
Worksheet time: 13mins
Given are reason of Iron and Manganese Removal except; (Medium)
Aesthetic Reason
Adsorption
Impact Color to Water
Stain Fixtures and Clothing
Preoxidation followed by sedimentation and filtration is (Medium)
ineffective for complexed Fe and Mn
cannot be regenerated
suitable for raw water
pre-oxidized constituents
What is the media being used in filtration? (Easy)
Ion Exchange
Lime-Soda
Greensand
Chlorine
Which is TRUE about oxidation-reduction with chlorine dioxide? (Medium)
higher pH reaction time is faster
if ammonia is present, the time for oxidation increases
if ammonia is present, the time for oxidation increases
pH of 9.5 manganese oxidation requires 1hr
Which is not belong to treatment strategies of Iron and Manganese removal? (Medium)
Nanofiltration
Filtration
Lime-Soda Softening
None of the above
U.S EPA set secondary drinking water MCL for Manganese (Easy)
0.5 mg/L
0.05 mg/L
5 mg/L
50 mg/L
U.S EPA set secondary drinking water MCL for Iron (Easy)
0.3 mg/L
30 mg/L
15 mg/L
20 mg/L
Identified as Iron stain color (Easy)
black
blue
green
red or rust
What is the most common method for Manganese and Iron removal? (Easy)
Preoxidation
Ion Exchange
Decision Tree
Filtration
Edhs
Pertains to dull green iron potassium silicate (Easy)
Greensand
Chlorine
Glauconite
Calcium
What water hardness is considered as the maximum level for public supply? (Easy)
100 to 300 mg/L
200 to 400 mg/L
300 to 500 mg/L
400 to 600 mg/L
What water hardness is considered to be moderately hard? (Easy)
60 to 120 mg/L
120 to 180 mg/L
180 to 240 mg/L
240 to 300 mg/L
In precipitation softening process, water is treated with what? (Easy)
Lime and soda ash
Greensand
Chlorine
Glauconite
Excess lime softening removes calcium and magnesium to the practical limit of about what value? (Easy)
35 mg/L
40 mg/L
45 mg/L
50 mg/L
Selective calcium carbonate removal is used to soften water to what amount? (Easy)
Less than 40 mg/L
40 mg/L
Greater than 40 mg/L
40 to 60 mg/L
Water hardness is caused by the ____ and ____ ions resulting from water contacting geologic formations (Easy)
Calcium and Magnesium
Calcium and Manganese
Iron and Magnesium
Iron and Manganese
It is the process of reducing raw water hardness, alkalinity, silica, and other constituents (Easy)
Chlorination
Turbidity Removal
Iron and Manganese Removal
Precipitation Softening
Which of the following is not a manmade synthetic organic chemicals containing carbon atoms that occurs not naturally? (Medium)
Pesticides
Urban Storm Water Runoff
Agriculture Related Chemicals
FOG
Renowned German Chemist that was known for the synthesis of urea (Easy)
Friedrich Wöhlerwas
Robert Bunsen
Fritz Haber
Otto Hahn
It refers to compounds composed of high vapor pressure which causes the compounds to easily evaporate (Easy)
Synthetic Organic Chemicals
Volatile Chemicals
Synthetic Chemicals
Volatile Organic Chemicals
Which is true on the following statements? (Hard)
Natural chemicals do not need to be made, as they are already present throughout our environment. While synthetic chemicals are man-made. They're often an imitation of natural chemicals
Natural chemicals need to be made, as they are already not present throughout our environment. While synthetic chemicals are man-made. They're often an imitation of natural chemicals
Natural chemicals do not need to be made, as they are already not present throughout our environment. While synthetic chemicals are man-made. They're often an not an imitation of natural chemicals
None of the following
Which is true on the following statements? (Hard)
The maximum contaminant level of Lindane is 0.002 mg/L
The maximum contaminant level of Picloram is 1 mg/L
The maximum contaminant level of Toxaphene is 0.003 mg/L
The maximum contaminant level of Methoxychlor is 0.045 mg/L
Among the following which is usually used on groundwater pump treatment and remedy? (Hard)
Metal Stripping
Air Stripping
Activated Carbon
Absorption
Which is true on the following statements? (Hard)
United States EPA chose Granulated Activated Carbon and Air Stripping as least available technology for treatment of VOCs except for vinyl chloride and methylene chloride
United States EPA chose Granulated Activated Carbon and Air Stripping as least available technology for treatment of VOCs including for vinyl chloride and methylene chloride
United States EPA chose Granulated Activated Carbon and Air Stripping as best available technology for treatment of VOCs including treatment for vinyl chloride and methylene chloride
United States EPA chose Granulated Activated Carbon and Air Stripping as best available technology for treatment of VOCs except for vinyl chloride and methylene chloride
None of the following
Volatile Organic Chemicals are classified in three groups in wastewater treatment; Which among the choices gives a chemical sample of each group? (Hard)
Benzene, Tetrachloroethylene and Methylene chloride
Benzene, Tetrachloroethylene and Xylene
Benzene, Tetrachloroethylene and Trihalomethanes
Benzene, Toluene, and Xylene
None of the following
