Class 4 Flashcards by Colton Durre

Are used to carry sewage or stormwater under streams highways or other depressions(higher or lower)

Inverted siphon pump

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Measures 2/3 upstream of converging section

Parshall flume

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Flow is determined by amount of water going through that weir

Weir

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Measures flow find measuring the difference in pressure before and at the construction of the pipeline

Venturi meter

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Day to night change

Diurnal

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How many turns do you leave a chlorination cylinder open after a restart

1/4

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If a mechanical seal drips

Replace it immediately

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How should packing be installed

Diagonally offset at a 45° angle

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How many pounds of oxygen can algae produce on a summer day

1.6 lbs

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What determines the effectiveness of dechlorination

Fecal coliform

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Advantages of aerobic compared to anaerobic

Aerobic happens quicker but cost more

Anaerobic cost less but it’s lower and much more complex

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What type of gas is produced in anerobic dig

Methane

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What drives the Distributor arm on a trickling filter

Hydraulic flow

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Vortex

Pump that pumps medium to heavy solids

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Oxygen deficient in a confined space

19.5%

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Water enters through the _____ of the impeller and leaves the ________

Eye

Vane

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Mechanical seal is either made of _____or ______

Carnon or ceramic

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Minimum operating depth of lagoon

2ft

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How many foot a fresh water and a lagoon before adding flow

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Run Lagoon and series during ______ and parallel during_______

Summer winter

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Lagoon draw downs happen in ______and ________

Spring and fall

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Minimum requirement of DO in the effluent

6.0

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Fm ratio

.2-.6

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_____mg/l will have no effect but _____mg/l will

5 50

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Secondary clarifier removes _____% of BOD

70-85

Activated sludge your moves _____% of BOD AND SUSPENDED SOLIDS and takes ___-___ hrs

90 99 | 4-8 hours

A significant change for an activated sludge plant is _____ F up or down

NPDES permit needs to be renewed every _____days

5 years and must be submitted 180 days before expiration

Operating temp of mechanical seal and a pump should never exceed

161 F or 71C

In a digester above the scum blanket as where gases are collected which is ___% methane and ____%CD

30 70

Maximum loading on a sand filter is

15gal/sqft/day

Normal domestic sewage contains

50% organic | 50% inorganic

Odor detection limit of chlorination gas

.0ppm

Head of weir is measured from the

Crest of the weir to the bottom of the weir plate

Short circuiting is

Flow taking a direct path from entry to exit with no proper detention time

MCL is

Maximum contamination level

Composite samples are used to test for

BOD TSS AMONIA

A DO test is performed

Immediately after sampling

What pumps can be started against a head

Centrifugal

What blower can be started against a close valve

Centrifugal

Fluctuating flows can be reduced by using

Variable speed pump’s or short pump cycles

Chlorine is a

Disinfectant

Always add acid to

Water

Grit is mainly

In organic materials

Algae respiration affect on pH in lagoon

Highest during day | Lowest at night

Bacteria does the most work in a

Faculitive lagoon

Dark sparkling means

Good and high in PH and DO

Dechlorination feed right of sulfur as

1:1

Roto meters control

Feed rates of chlorine

Copper sulfate controls

Algae growth

Oxidizers are used to

Control odors in a collection system

How can grit be removed from a pump

Vortex pump

How many contacts needed for a 440 circuit

What is aSCADA system

Computer system that monitors waste water

BOD needs to be incubated for how many days at what temperature

Five days at 20°C

Temperature for oven on total solids test

104 C

What gas has the lowest specific gravity

H2S

Which gas has the highest specific gravity

What affects the disinfection process in UV light

Unfiltered water, chemicals

RBCs are ____ under water

1/4 1/2

Current is measured in

Amps

Sterilization is

Killing all organisms

Disinfection is

killing all pathogenic organisms

Trickling filters are

Biological aeration treatment

Clarifiers do what

Separate or settle solids

What provides lubrication on packing seals

Clean water

A fusable plug will melt at

160F

If you show A positive fecal coliform test

Take a repeat sample and retest after 24 hours

BOD samples can be stored for

24 hours at 20°C

DO calibration method

Azide

Piston pumps are also called

Reciprocating pumps

If a unit goes down on a parallel circuit

It will seize function until the Parallel circuit is replaced

Weeds are to be

Called sprayed or cultivated by tilling the top layer

If water stops flowing in a chlorinator

The vacuum is broken and no chlorine will be fed

Long Sluggish sewers can cause

Hydrogen Sulfide and corrosion problems

Pooling/ponding is caused by

Excessive biological growth on trickling filter

Vector in bio solids

Misquotes, birds, fleas rodents

Past NPDES permits need to be kept for how long

3 years

Facultative pond has what type of organic loading

15-30 lb/bod/acre/day

Copper sulfate can control what

Algae growth

What will cause the lowest amperage reading

Broken coupler

Oxygen solubility is greatest in

Winter

The two major items in activated sludge is

Aerated basin and secondary clarifier

A transformer does what

Steps up or down voltage for use

Rubber coupling is used for what on a blower

To displace and allow heat expansion

Sloughing is what

When biological growth builds up and growth on bottom drops off to be removed

Mesophillic

80-100F

Thermophillic

120-135F

Lay dry beds

8-12 inches

Highest loading in a lagoon

Nearest to the influent

Two types of anerobic bacteria

Acid bacteria | Methane bacteria

Positive displacement pumps are used to pump

Sludge

Raw wastewater contains

BOD TSS FOG NH3

Sources of wastewater

Domestic-houses Storm flow- drains Industry- factory I and I- above and below ground

What is the book where we find testing standards

Method of standards

SARAH is what

Superfund amendments and reaurhroization act | It covers hazardous materials used and stored on site

NPDES stands for

National pollutants discharge elimination system

What should you do with disposing of grit and screenings

Landfill and buried immediately

Endogenous repspirstion occurs in what plant

extended airation

Your Supervisor recommends that you increase the deal levels in the entering of the Orval oxidation ditch

Change weir depth or change BFE setting

Start up a lagoon should be what time of year

Spring summer