Waste Water Class D & C

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Sewer systems are designed for

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A 50 year life span

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Aerobic

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Fresh, as oxygen

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Anaerobic

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Septic, no oxygen

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Molecular weight of water

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18g/ mole

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Blood is % water

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83

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I’mnoff tank

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2 story, built in 1906

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What is tceq

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State

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What is epa

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Federal

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Fines are-

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$2500 per day per violation

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Dissolved solids

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Solids that can be can through a filter

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Settable

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Removed in sedimentation

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Non settable

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Removed in secondary process

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Acidic ph

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>7

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Ph neutral

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7

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<7 ph

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Basic

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A chemical is organic if it will

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Burn

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B.O.d. Test indicates

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The strength of sewage 5 days ago

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Wastewater is % water

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99.8-99.9% water

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Minimum flow

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2ft/sec

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Inflow

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Additional flow illegal or unknown taps

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Infiltration

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Water entering through cracks

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Inverted siphon

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A sewer line that connects one side to another ex: creek

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Cross connection

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Physical connection of safe to unsafe water

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Alkalinity

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The capacity of water to neutralize acids

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Direct beneficial re use of treated effluent

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Protects environment

Conserves water for re use

Protects down streams supplies of water

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Effluent should have a chlorine residual of

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1.0mg/l and have at least 20 minute contact time in the chlorine chamber

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When effluent with high BOD and is discharged into a receiving stream-

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The DO decreases

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Inorganic solids may contain

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Sand

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Any plant with a design flow of .5mgd

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Is required to install instrumentation to measure continuous flow

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Increase of organic matter means

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Increase of chlorine demand

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Bod test

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How much demand of oxygen is needed to maintain a healthy environment for aerobic microbes

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Each person contributes

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.17 lbs of BOD a day

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Disadvantages of screening devises

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Frequent cleaning and disposal

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Screenings may be disposed by

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Burning

Burying

Grinding

Digestion

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Clarifier sludge zones

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Inlet

Settling

Outlet

Sludge

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Activated sludge process

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Operates on the principle of concentrated biological activity in a aerobic (oxygen) environment. *secondary process*

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Mlvss

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Mixed liquor/ volatile suspended solids

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Methane characteristics

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Colorless

Odorless

Tasteless

Flammable

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Anaerobic digesters

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The primary purpose is to reduce the amount of solids and also stabilize solids prior to dewatering

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Volatile solids reduction is crucial to

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Class a biosolids

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Anaerobic digestion phases

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Hydrolysis

Acid production

Methane production

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Aerobic digesters

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DO is maintained by artificial aeration. Aerobic bacteria are the main microbes to carry out digestion

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Extreme aerobic digestion (endogenous)

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No food is added so microbes eat themselves

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Oxidation ponds

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Most common, aerobic bacteria. 30day DT. 35lbs per day organic loading rate.

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Algae

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Autotrophs

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Facultative ponds

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2 layers.

Upper- very much like oxidation

Lower- annoxic ( little oxygen) or anaerobic( no oxygen)

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Anaerobic pond

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No D.O

Used to treat sewage with high bod

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Aerated pond

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8-10ft

Mechanically aerated

High organic loading rate

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A good pond will have an inflow

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With multiple inlets and outlets

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Trickling filters parts

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Distribution system

Media

Tank

Under drain

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Septic conditions in a TF occur when

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Not enough sloughing if humus sludge

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Septic condition in TF

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Anaerobic = bad

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Humus sludge

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Sludge from a TF

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Growth on a TF

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Zogleal mass

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The main purpose of a TF

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Remove settable/ dissolved organic matter through biological stabilization

And remove bod

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TF efficiency is dependent on

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Recirculation

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Bod is used to determine TF

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Efficacy

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Problems at TF plants

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Ponding

Filter flies

Odors

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The bell end of a pipe should

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Point up grade (up hill)

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If a centrifugal pump has a worn impeller

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It will lose more energy

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Disadvantage of pond system

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Amount of land required

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Factor important to efficient pond operation

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Prevention of rooted plants near or in pond

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What does F and M stand for in FM ratio

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Food to microorganisms

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What is preliminarys main purpose

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Remove large solids

(Rags)

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How many gallons of waste water are contributed each day per person?

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100 gallons

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How many feet should water and sewer lines be kept apart?

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9 ft

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What equipment may be used by maintenance to inspect sewer lines

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Camera

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Organic matter

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All carbon containing substances

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Inorganic chemicals

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All substances that don’t contain carbon

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Ponding is caused by:

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Clogged drains, hydraulic overload, zoogleal mass, humus sludge could have sloughed onto media, snails,

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Ponding is caused by:

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Clogged drains, hydraulic overload, zoogleal mass, humus sludge could have sloughed onto media, snails,

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How to fix ponding?

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Chlorinate media

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What is bulk sludge?

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Clear supernatant, settles slowly, some floc

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What is bulk sludge?

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Clear supernatant, settles slowly, some floc

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What would disturb the plant the most?

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Bp filtrate to eq. Basin

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What is bulk sludge?

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Clear supernatant, settles slowly, some floc

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What would disturb the plant the most?

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Bp filtrate to eq. Basin

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Who signs DMRs?

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Elected official (plant manager)

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What is bulk sludge?

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Clear supernatant, settles slowly, some floc

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What would disturb the plant the most?

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Bp filtrate to eq. Basin

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Who signs DMRs?

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Elected official (plant manager)

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Do samples once collected are

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Analyzed immediately

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Inorganics in grit removal is in which process?

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Primary

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Inorganics in grit removal is in which process?

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Primary

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Primary clarifier loading due to?

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Surface loading

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Inorganics in grit removal is in which process?

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Primary

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Primary clarifier loading due to?

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Surface loading

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Why is sludge rising?

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Denitrification, gases bubbles