Calculate the annual power cost to operate the following UV disinfection system;
assume all lamps are used 365 days per year.
Power cost = $0.10/kWh
Lamp power used = 700 W, and
Number of lamps = 50
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$3500 per year
What are the components of an effective safety program?
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, Regular safety briefings, daily practice, a strong advocate for safety, and a
strong central leader.
On a secondary clarifier drive unit, it is recommended that the torque switches be
checked
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Weekly
Lime coagulation will be most successful in removing which heavy metal?
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Arsenic
The condition when a column of water that typically travels downward in an aerator
draft tube reverses and starts flowing upward is called
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Flooding
What type of microorganism is prevalent in the second stage of anaerobic digestion?
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, Methane-forming bacteria
Given the following information about a primary clarifier:
Sludge is very thin,
Sludge collector motor running,
The flow over the weirs appears normal, and
Sludge collector is moving
What is the most probable problem?
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Excessive sludge pumping
Before doing maintenance on the lamps of a UV disinfection system, the power to the
lamps must be turned off so exposed lamps out of the water do not cause what?
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Burns to the eyes and skin
The local water resource recovery facility has three 60-ft (18 m) diameter anaerobic
digesters that are 35 ft deep. Given the following information calculate the volatile
solids reduction.
Thickened sludge flow = 11 L/s (250,000 gpd)
Thickened sludge percent solids = 4.1%
Thickened sludge percent volatile solids = 78%
Digested sludge transferred per day = 6.3 L/s (144,000 gpd)
Digested sludge percent solids = 2.61%
Digested sludge percent volatile solids = 64%
assume all lamps are used 365 days per year.
Power cost = $0.10/kWh
Lamp power used = 700 W, and
Number of lamps = 50
Give this one a try later!
$3500 per year
What are the components of an effective safety program?
Give this one a try later!
, Regular safety briefings, daily practice, a strong advocate for safety, and a
strong central leader.
On a secondary clarifier drive unit, it is recommended that the torque switches be
checked
Give this one a try later!
Weekly
Lime coagulation will be most successful in removing which heavy metal?
Give this one a try later!
Arsenic
The condition when a column of water that typically travels downward in an aerator
draft tube reverses and starts flowing upward is called
Give this one a try later!
Flooding
What type of microorganism is prevalent in the second stage of anaerobic digestion?
Give this one a try later!
, Methane-forming bacteria
Given the following information about a primary clarifier:
Sludge is very thin,
Sludge collector motor running,
The flow over the weirs appears normal, and
Sludge collector is moving
What is the most probable problem?
Give this one a try later!
Excessive sludge pumping
Before doing maintenance on the lamps of a UV disinfection system, the power to the
lamps must be turned off so exposed lamps out of the water do not cause what?
Give this one a try later!
Burns to the eyes and skin
The local water resource recovery facility has three 60-ft (18 m) diameter anaerobic
digesters that are 35 ft deep. Given the following information calculate the volatile
solids reduction.
Thickened sludge flow = 11 L/s (250,000 gpd)
Thickened sludge percent solids = 4.1%
Thickened sludge percent volatile solids = 78%
Digested sludge transferred per day = 6.3 L/s (144,000 gpd)
Digested sludge percent solids = 2.61%
Digested sludge percent volatile solids = 64%
