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