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40 Cards in this Set

  • Front
  • Back
V notch weirs attached to a primary effluent launder measure the flow rate
False
A major purpose of preliminary treatment is to protect pumps and other equipment from pluggin, wearing or possible damage.
True
The units ppm and mg/L are considered to be equivalent for wastewater calculations.
True
A Parshall flume is often found in the headworks area of a wastewater plant
True
Chlorine residual= Chlorine demand--chlorine dose.
False
A launder in a primary clarifier is a trough used to convey flow.
True
Most wastewater treatment plants have a seperate industrial wastewater collection system.
False
The glass tube on the front of a chlorinator cabinet, called a rotameter, measures the chlorine feed rate in units of pounds per million gallons of flow.
False
The F to M ration is an important consideration in the operation of an activated sluge wastewater plant.
True
Organic loading to a stablization pond is pounds of BOD per day per 1000 cubic feet of pond volume.
False
A change in the pH of digesting sluge in anaerobic digester is the best early warning indicator of potential digester upset.
False
A one acre wastewater treatment pond operated at a depth of 3 feet holds approx. 1 million gallons
True
A grab or a composite sample may be used interchangeably for all lab tests
False
The volatile acid concentration is an important lab test used to monitor an anaerobic digester.
True
Photosynthesis is an essential part of the biological activity occurring in a facultative wastewater treatment pond.
True
A properly operating grit chamber should yield grit that is high in fixed solids (inorganic material) and low in volatile solids.
True
Comminutors cut up or shred large objects normally found in raw wastewater and remove them from the wastewater flow
False
MCRT refers to the average number of days that a "cell" or "organism" spends in an activated sludge system
True
Settling and scum removal are both important to the success of primary treatment.
True
In some primary clarifiers water or air sprays may be used to push scum toward the scum removal point.
True
The lowest concentration of dissolved oxygen in well- operating facultative wastewater treatment pond typically occurs just before sunrise because algae use up oxygen at night.
True
Operators may use sluge blanket levels in primary clarifiers to adjust sludge pumping rates.
True
Uneven weirs may result in short circuiting in a primary clarifier.
True
Raw sludge pumped from a primary clarifier generally contains about 3% to 6% total solids.
True
PRIMARY EFFLUENT is the wastewater flowing into an aeration tank in a conventional activated sludge wastewater plant.
True
Daily visual observations of a wastewater treatment pond's color and surface condition should be routine for pond operation.
True
Acre-feet is a measure of a wastewater treatment pond's surface area.
False
A facultative pond is normally aerobic throughout its entire depth
False
Wastewater ponds are usually started during the cold winter months in order to take advantage of oxygen's greater solubility in cold water as compared to warm water.
False
The minimum operational depth of a facultative wastewater treatment pond is considered to be 3 ft.
True
A progressive cavity pump is often used to pump raw sludge.
True
A rise in DO will be accompanied by a drop in pH in a facultative wastewater treatment pond that is operating normally.
False
Storm water run off flowing into a sewer through a flooded or unsealed manhole is referred to as INFILTRATION.
False
Mechanical aerators are often used to provide supplemental oxygen in a facultative pond.
False
Sodium thiosulfate is routinely used to dechlorinate a secondary wastewater effluent prior to its discharge into the receiving water.
False
Either pounds of BOD or COD can be used as a measure of the food applied to the aeration tank of an activated sludge plant
True
Pre-chlorination is used for odor control at wastewater treatment plant
True
Although chlorine is a greenish-yellow hazardous gas at atmospheric pressure, some of the chlorine is a liquid when under pressure in a one-ton chlorine container.
True
In an anaerobic digester, some organic matter in raw sludge is converted to other organic compounds and to gases.
True
The presence of hydrogen sulfide cannot always be detected by its characteristic odor.
True