More M&M Today's Questions
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Wastewater Treatment, Water Treatment, Distribution, and Collection
How about some practice calculating pump capacities?
| Formula | ||||||||||
| Length, ft | Width, ft | SWD, ft | Min Depth, ft | Drawdown, ft | Volume, cf | Drawdown Time, min | Flow, gpm | Flow, gpd | Flow, MGD | Flow, cfs |
| 20 | 10 | 12 | 4 | 30 | ||||||
| 30 | 15 | 14 | 5 | 35 | ||||||
| 50 | 25 | 16 | 6 | 40 | ||||||
| 80 | 40 | 18 | 7 | 45 | ||||||
| 100 | 50 | 20 | 8 | 50 | ||||||
How about some more practice calculating chlorine dosages, residuals, and demands in mg/L and lbs?
| Day | Flow | Chlorine | |||||
| MGD | Dose | Residual | Dose | Residual | Demand | ||
| LBS | mg/L | mg/L | LBS | mg/L | LBS | ||
| 1 | 0.61 | 8.38 | 0.5 | ||||
| 2 | 0.59 | 7.43 | 0.5 | ||||
| 3 | 0.58 | 7.67 | 0.5 | ||||
| 4 | 0.54 | 6.93 | 0.5 | ||||
| 5 | 0.80 | 9.02 | 0.5 | ||||
| 6 | 0.82 | 9.92 | 0.5 | ||||
| 7 | 0.53 | 6.48 | 0.5 | ||||
| 8 | 0.52 | 6.56 | 0.5 | ||||
| 9 | 0.60 | 7.83 | 0.5 | ||||
| 10 | 0.51 | 6.76 | 0.5 | ||||
| 11 | 0.57 | 6.75 | 0.5 | ||||
| 12 | 0.75 | 8.48 | 0.5 | ||||
| AVERAGE | |||||||
| MAXIMUM | |||||||
| MINIMUM | |||||||
How about some practice calculating chlorine dosages, residuals, and demands in mg/L and lbs?
| Day | Flow | Chlorine | |||||
| MGD | Dose | Residual | Dose | Residual | Demand | ||
| LBS | mg/L | mg/L | LBS | mg/L | LBS | ||
| 1 | 61 | 838 | 0.5 | ||||
| 2 | 59 | 743 | 0.5 | ||||
| 3 | 58 | 767 | 0.5 | ||||
| 4 | 54 | 693 | 0.5 | ||||
| 5 | 80 | 902 | 0.5 | ||||
| 6 | 82 | 992 | 0.5 | ||||
| 7 | 53 | 648 | 0.5 | ||||
| 8 | 52 | 656 | 0.5 | ||||
| 9 | 60 | 783 | 0.5 | ||||
| 10 | 51 | 676 | 0.5 | ||||
| 11 | 57 | 675 | 0.5 | ||||
| 12 | 75 | 848 | 0.5 | ||||
| AVERAGE | |||||||
| MAXIMUM | |||||||
| MINIMUM | |||||||
Chlorine ton cylinders at room temperature will deliver gas at a maximum rate of
150 lb cylinders Ton Containers
A. 10 pounds per day 100 pounds per day
B. 25 pounds per day 250 pounds per day
C. 40 pounds per day 450 pounds per day
D. 150 pounds per day 2000 pounds per day
Click on the thumbnail below for a chart of pump station math for cylindrical tanks and have some fun!!!
Click on the thumbnail below for a chart of pump station math for rectangular tanks and have some fun!!!
Click on the thumbnail below for a chart of pipe math and have some fun!!!
Which of the following valves only permits flow to move in one direction?
A. Butterfly
B. Check
C. Gate
D. Plug
The specific gravity of a colloidal solid is very close to 1. This means that the colloid
A. Will float within an hour
B. Will settle within an hour
C. Won't settle or float
The specific gravity of a settleable solid is
A. 1
B. Greater than 1
C. Less than 1
The specific gravity of a floatable solid is
A. 1
B. Greater than 1
C. Less than 1
The specific gravity of chlorine gas is
A. 1
B. Greater than 1
C. Less than 1
|
Matching |
|
|
1. Calcium |
A. C |
|
2. Carbon |
B. S |
|
3. Chlorine |
C. P |
|
4. Copper |
D. K |
|
5. Fluorine |
E. O |
|
6. Iron |
F. Na |
|
7. Hydrogen |
G. N |
|
8. Lead |
H. Mg |
|
9. Magnesium |
I. Ca |
|
10. Manganese |
J. Cl |
|
11. Nitrogen |
K. Cu |
|
12. Potassium |
L. Mn |
|
13. Sodium |
M. Fe |
|
14. Oxygen |
N. H |
|
15. Phosphorus |
O. Pb |
|
16. Sulfur |
P. Fl |
| Match | |||
| 1 | The units for pressure are | A | Divided by |
| 2 | Head is expressed in | B | 2.31 |
| 3 | Velocity is measured in | C | 0.434 psi |
| 4 | Units of flow | D | psi |
| 5 | Pressure times _______ = Head | E | fps |
| 6 | Head __________ 2.31 = Pressure | F | 1440 |
| 7 | 20 psi = | G | 694 gpm |
| 8 | 1 MGD = | H | cfs |
| 9 | A head loss of 7 feet = | I | 3 psi |
| J | Times | ||
| K | ft | ||
| L | 46.2 ft | ||
| M | Subtracted by | ||
Which of the following is correct?
A. A is the follower and B is the lantern ring
B. A is the lantern ring and B is a packing ring
C. A is a packing ring and B is the lantern ring
D. A is a packing ring and B is the follower
pH measures
A. H+
B. OH-
C. O2
D. Phosphorus
The formula for the volume of a rectangular tank is
A. (Length)(Width)
B. (0.785)(Diameter2)
C. (Length)(Width)(Height)
D. (0.785)(Diameter2)(Height)
The formula for the volume of a cylindrical tank is
A. (Length)(Width)
B. (0.785)(Diameter2)
C. (Length)(Width)(Height)
D. (0.785)(Diameter2)(Height)
How do you know that your pump is cavitating?
A. It doesn't sound right
B. It runs hot
C. It won't start
D. All of the above
Given a tank measures 50 feet long, 25 feet wide, and 15 ft deep, calculate:
- Surface area in ft2
- Cross-sectional area in square feet
- Volume in cf
- Capacity in gallons
A chlorine atom is composed of
A. Electrons
B. Neutrons
C. Protons
D. All of the above
Throttling the discharge valve on a centrifugal pump will the likely ______ temperature of the motor and ______ the temperature of the pump
A. Increase, increase
B. Increase, reduce
C. Reduce, increase
D. Reduce, reduce
The chemical symbol for chlorine gas is
A. Cl
B. Cl-
C. Cl2
D. HOCl
Which of the following is the indicator used for pathogens?
A. Amoebic dysentery
B. E. coli
C. Salmonella typhosa
D. V. comma
Pump suction and discharge pressures are usually measured in
A. gpm
B. kWh
C. mg/L
D. psi
Which of the following is the correct formula for chlorine in water?
A. Cl2 + H2O → HOCl + HCl
B. NaOCl + H2O → HOCl + NaOH
C. Ca(OCl)2 + 2H2O → 2HOCl + Ca(OH)2
D. HOCl → H+ + OCl-
E. All of the above
Wastewater and Water
How about some practice calculating detention times, surface loading rates, and weir overflow rates for the following clarifiers/sedimentation tanks?
6 tanks; the dimensions of each tank are:
-
Overall diameter is 130 ft
-
12 ft SWD
-
17 ft deep in center
-
Weir diameter is 125 ft
Click on the thumbnail below for the clarifier math chart and have some fun!!!
Which of the following is the correct wavelength of UV for disinfection?
A. 253.7 nm
B. 372.5 nm
C. 537.2 nm
D. 725.3 nm
Which of the following describes flocculation?
A. Suspended solids that are too small to settle
B. Quiescent conditions that allow settleable solids to settle
C. Neutralizing charges
D. Growth of smaller solids into larger masses that will settle
Hypoxic zones are caused by high levels of
A. Colloidal suspended solids
B. Dissolved O2
C. Nitrogen & phosphorus
D. Pathogens
Wastewater Treatment and Collection
The PE for flow is _____ gpcd and PE for BOD is _____ lbs BOD/person/day.
A. 0.17 for both
B. 0.17 and 100
C. 100 and 0.17
D. 100 for both
Wastewater Treatment
Which of the following lab tests is used to determine the total amount of nitrogen in our effluent?
A. TN
B. TKN
C. NO3
D. NH3
According to USEPA, the standard secondary removal efficiency is
A. 15%
B. 30%
C. 85%
D. 95%
A special thanks to Courtney Cswercko, Iowa DNR, for her presentation at the March 6, 2009 AceOps Annual Conference in Council Bluffs, IA!!! Her presentation is the source of this question.
The maximum holding time for e. Coli samples according to Standard Methods is
A. 30 minutes
B. 60 minutes
C. 6 hours
D. 36 hours
A special thanks to Courtney Cswercko, Iowa DNR, for her presentation at the March 6, 2009 AceOps Annual Conference in Council Bluffs, IA!!! Her presentation is the source of this question.
Click on the thumbnail below for a chart of BOD and TSS math and have some fun!!!
Which of the following is used for process control for activated sludge?
A. MCRT
B. Surface settling rate
C. Volatile acids to alkalinity ratio
D. Weir overflow rate
| Fill-In the Missing Information | |
| Clarifiers | 6 |
| Diameter | 130 ft |
| SWD | 12 ft |
| Area | |
| Volume | |
| Weir Diameter | 125 ft |
| Weir Length | |
| Avg Day Flow | 51.6 MGD |
| Max 30-day Avg | 100.6 MGD |
| Max Day | 153.5 MGD |
| Peak | 195.5 MGD |
| Avg Day HDT | |
| Max 30-day Avg HDT | |
| Max Day HDT | |
| Peak HDT | |
| Avg Day SLR | |
| Max 30-day Avg SLR | |
| Max Day SLR | |
What is the minimum recommended velocity in non-aerated grit chambers?
A. 0.2 fps
B. 1 fps
C. 2 fps
D. 10 fps
A settleometer is used to measure
A. Rate of settling in a final clarifier
B. Rate of settling in a primary clarifier
C. Sludge depth in a final clarifier
D. Sludge depth in a primary clarifier
Collection
What is the minimum recommended velocity in sanitary sewers?
A. 0.2 fps
B. 1 fps
C. 2 fps
D. 10 fps
Water Treatment and Distribution
Chloramines are used for
A. Corrosion control
B. Disinfection
C. Iron and manganese removal
D. Softening
EPA estimates that the average household can save more than ______ gallons of wasted water per year (not to mention more than ______ % percent cost savings on their water bills) by fixing easily corrected problems such as leaking toilet flappers and dripping faucets.
A. 100 gallons; 1%
B. 500 gallons; 2%
C. 5000 gallons; 5%
D. 11,000 gallons, 10%
Special thanks to Iowa DNR's Water Supply Listserv - Feb 5, 2009 edition
The creamy color scale on the inside of pipes is caused by
A. Calcium carbonate
B. Iron oxide
C. Manganese dioxide
D. Magnesium carbonate
According to the 10 State Standards, the minimum allowable pressure in the distribution system is
A. 20 PSI
B. 35 PSI
C. 40 PSI
D. 100 PSI
Water Treatment
Which of the following is used for process control for filters?
A. Chlorine demand
B. Detention time
C. g
D. Hydraulic loading rate
The main purpose of a rapid sand filter is to remove
A. DBPs
B. Pathogens
C. THMs
D. Turbidity
Distribution
In a distribution system, opening or closing a valve or a fire hydrant too quickly may cause
A. Cavitation
B. Scaling
C. Tuberculation
D. Water hammer
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