Wastewater Grade 2 t/f

50 terms by DERFSTA

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Hydraulic loading to a facultative wastewater pond is measured in units of Inches/day

True

An Imhoff cone is often used to measure the effectiveness of primary sedimentation

True

A well-operating primary clarifier will generally remove nearly all settleable solids

True

The trickling filter recirculation ratio is calculated as follows Qr/Q

True

Chlorine dose = Lbs of chlorine/day divided by the flow in MGD

False
needs 8.34

A combined sewer carries domestic waste , industrial waste and storm water

True

Algae use oxygen at night in a facultative pond

True

The pH of digesting sludge in a healthy anaerobic digester should be near 7.0

True

Percent volatile solids reduction equals :
IN-OUT over IN-(IN x OUT) X 100%

True

A chlorine dose of 5 ppm or mg/L is equivalent to adding 5 lbs. of chlorine per million pounds wastewater flow

True

The main function of a secondary digester in normal operation is to allow liquids and solids to separate

True

Poor grit removal would affect the operation of a anaerobic digester

True

BOD removal efficiency in a well-operating primary clarifier is generally in the range of 25-40%

True

The M in the F to M ratio refers to the pounds of mixed liquor suspended solids under aeration in an activated sludge aeration tank

False

A barminutor may be set to start automatically based on a loss of head pressure through this device

True

Ppm ( parts per million) and mg/L are essentially equivalent units

True

The terms "high rate" and "low rate" refer to the rate at which gas is produced in an anaerobic digester

False

A grit chamber with a flow velocity of 0.2 ft/sec may allow a significant quantities of volatile material to setle out

True

Secondary wastewater treatment processes generally involve the aerobic decomposition of organic matter

True

Preliminary wastewater treatment is used to protect pumping equipment and to facilitate subsequent treatment processes

True

Oxygen may be referred to as either combine oxygen or free molecular oxygen

True

Solids in a wastewater effluent may undergo aerobic decomposition in the receiving water if dissolved oxygen is available.

True

The MPN test measures the number of pathogens in a wastewater effluent

False

Wastewater treatment ponds that receive raw wastewater are called stabilization ponds

True

Pre-aeration of raw wastewater may result in better removal efficiencies in the primary clarifier

True

Domestic wastewater contains approximately 0.1% Total solids.

True

A well-operating anaerobic digester should have a CO2 concentration of more than 40%

False

Wastewater having a pH of 7.3 is slightly basic or alkaline

True

Gas production in an anaerobic digester results from the destruction of organic solids

True

Pre- chlorination of raw wastewater requires that a chlorine residual of at least 0.5mg/L be attained in order to assure odor control

False

Velocity in a grit chamer may be controlled by a proportional weir

True

The only function of flights in a rectangular sedimentation tank is to push the settled sludge toward the sludge hopper

False

Percent efficiency of solids or BOD removal is calculated using the following formula:
IN-OUT / IN X 100

True

Velocity is an important consideration in the operation of a collection system or a grit chamber

True

One acre-ft of water contains 45,336 ft cubed

False

MGD and ft cubed/sec are both units of flow

True

BOD5 and SS are both used as measures of the strength of wastewater

True

Hydraulic loading to a clarifier is expressed in units of gallons per day

False

The solids in primary sludge contains both a volatile and fixed part

True

Chlorine feed rate and chlorine residual are both usually expressed in units of ppM

False

SVI is a measure of the rate at which activated sludge mixed liquor settles

False

A shear pin that constantly breaks should be replaced with a pin of greater strength

False

Septic sludge probably have a low pH

True

When computing anaerobic digester organic loading one must take into account the loss of solids in the digester supernatant

False

The F in the F to M ratio may be measured as either BOD or COD

True

An anaerobic digester is generally equipped with a combination pressure-vacuum relief valve

True

Extended aeration activated sludge plants are designed to have aeration tanks that can hold approximately one day's flow

True

A 5 foot deep facultative pond is usually mixed with floating aerators during cloudy days

False

A parshall flume measures velocity of the influent flow

False

When BOD and COD are measured on a primary effluent sample the BOD will generally be greater than the COD

False

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