Wastewater Test 2

25 cards


 
  
Created May 8, 2012
by
thardman02

 

 
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  Side A   Side B
1
What would cause sludge floc to break up in the air flotation thickners?
 
Incorrect flocculant dosage
2
Which of the following is the best lab test to measure solids in the aeration basin?
 
mixed liquor volatile suspended solids
3
What effect would adding lime to an aerobic digestor cause?
 
rasie alkalinity
4
If the sludge depth in a secondary sedimentation tank is too high, what will happen?
 
sludge may become septic
5
What chemical is used to control the pH in an anaerobic digestor?
 
lime
6
Which test is best to measure the effectiveness of polymer?
 
jar test
7
If short circuiting is discovered in a secondary clarifier, what action should be taken?
 
level the effluent weirs
8
Although carbon dioxide gas is not poisonous, it can cause?
 
asphyxiation
9
What chemical would you add to improve settling in a primary clarifier?
 
aluminum sulfate
10
Where should you take a sample in an aeration tank to measure solids settleabillity?
 
the end
11
Which of the following chemicals is used to control hydrogen sulfide in sewers?
 
chlorine
12
What action should be taken to correct a noisy drive chain?
 
tighten and align the chain
13
Which of the following can be used to put out a gasoline fire?
 
carbon dioxide
14
A wetwell is 8 ft x 7ft. With the influent flow to the wetwell stopped , a pump lowers the...
 
168
15
Which of the following will affect pressure in a pipe?
 
elevation/friction
16
What chemical typically used to pretreat sludge prior to dewatering?
 
polymer
17
Over lubrication of a shaft bearing can result in what?
 
the bearing will overheat and cause damage
18
What causes cavitation in centrifugal pumps?
 
pumping against hight discharge head then specifications
19
When adjusting the packing gland after re-packing a pump, how should you tighten it?
 
slowly, over a period of hours until you obtain the desired weepage
20
A cross connection is a direct connection between what?
 
potable water and non-potable water
21
What DO level should be maintained in an activated sludge aeration tank?
 
1-2 mg/L
22
When a sprocket of a chain drive mechanism on a screen starts to wear what do you do?
 
turn the sprocket over and order a replacement
23
Hom many gallons will a 12in diameter pipe hold if the inside of the pipe is uniformly coated...
 
1,222
24
With a flow of 510,000 gallons per day, a chlorine feed of 250 pounds per day and a chlorine...
 
56
25
On a manually cleaned barscreen, the wasterwater is 9 inches higher on the influent side. What...
 
the barscreen is clogged


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