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116 Cards in this Set
- Front
- Back
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Who was TCEQ created by
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Texas water code
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Each person uses ________ gallons of water a day
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100 gal per day
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Why treat wastewater
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To stabilize unstable organic matter
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What are reasons to revoke your license
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Permit violations, false records and other good causes
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Anaerobic digestion consists of ________% methane gas
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75 %
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What is the percentage of solid waste water
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0.10
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What does lack of dissolved oxygen (DO) cause
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Septic conditions
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What kind of bacteria can survive with or without dissolved oxygen (DO)
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Facultative bacteria
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What do check valves do
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Prevent backflow
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What do nitrates indicate
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Well treated sludge
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What do gas vents do in imhoff tanks
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Let's gas escape
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What solids do you take out in primary treatment
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Settable solids
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What is the cause of low BOD in primary treatment
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Flow is too fast
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What is the range of the detention time in a clarifier
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30 minutes to 2 hours (wastewater treatment says book 1 to 3 hours)
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What is a common problem in activated sludge
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Bulking
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What are trickling filter is used for
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Bod reduction, effluent polishing, pretreatment.
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What dose a oxidation ditch have
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A rotor or rotors
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What is the process in which an oxidation ditch operates
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Log growth phase
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What is a disadvantage of a aerated lagoon
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It takes up too much space
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What does BOD stand for
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Biochemical oxygen demand
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What does BOD measure
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It measures oxygen consumed chemically in a certain class of bacteria
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In a oxidation pond what is the most important thing to |
Good Housekeeping |
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What causes odors in a trickling filter
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Septic or anaerobic conditions
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What is a advantage of contact stabilization over conventional activated sludge
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Smaller tank volume
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What is the purpose of doing a settable solids test on an influent clarifier and on an effluent clarifier
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To determine the efficiency of the clarifier
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What are the two basic controls an operator has in the activated sludge process
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Air and return sludge
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What does pathogenic mean
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Disease carrying
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What are some diseases in sewer
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Typhoid, paratyphoid, infectious hepatitis, cholera, dysentery
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CL-2 gas is
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A poison
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Why do preventive maintenance
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Why do preventive maintenanceto keep equipment in good working order and reduce emergency maintenance
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In a plant of 10 mg D or more how often do you run a MLVSS test
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Once a day
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What is the difference between anaerobic and aerobic digestion
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Anaerobic doesn't need air
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What for test do you run in anaerobic digester
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PH, volatile acids, achalinity, CO2 (Gas production)
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What does aerobic digestion have
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Aerobic bacteria
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What does aerobic digestion bacteria reproduce
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Water, new cells and carbon dioxide
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What does sludge digestion do
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Stabilize excessive sludge or organic matter
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When using chemicals what do you
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Safety aspect for the public
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Will garbage grinders increase velocity
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No
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What are some things you can do to clean a sewer line
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Jet machine, rodding machine, porky pine or a pipe pig
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What is an advantage of using vitrified clay pipe
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Cheap
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Corrosion in a sewer system is caused by
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Reduction in the sulfur compound, septic sewer and (or) H 2 S
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How does CO2 kill you
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It deprives you of oxygen
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What should you have when you enter a room with a CL2 leak
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A self-contained air pack and backup personnel
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Supernatant liquid that comes from anaerobic digestion has what
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5 times greater BOD then raw sewer
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CL2 works better at above ____ PH
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7 PH
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When doing work on by a roadway what are several pieces of equipment to take
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Cones, signs, barricades. (probably and all of the above answer)
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When approaching chemicals what should you use
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Caution
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What are some of the other things you should use caution around
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Manholes, ladders, activated sludge basins, other slip trip and fall hazards
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Whose job is safety
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Everyone
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In an activated sludge plant what is a short circuit
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The buildup of solids in your aeration tank
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What can cause a short circuit in a treatment plant
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Defective diffusers and (or) low air
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What is the first thing you do if a shortcut occurs
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Identify the cause
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What is the appearance and smell of sludge from an anaerobic digester
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Dark in colour with a slightly tarry odor
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What is organic matter
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Anything living
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What is non-living matter
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Inorganic matter
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What are three kinds of bacteria in waste water
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Aerobic bacteria (has air) , Anaerobic bacteria (dosen't have air) and facultative bacteria
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What is detention time
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From the time it enters the tank to the time it exits the tank
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How do you calculate detention time
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Amount of gallons in your tank ÷ by GPM
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What is the required attention time in a CL2 to chamber
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20 minutes at peek flow
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What are the three main parts of cl2 disinfection
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Dosage and (or) %, demand and residual.
1.Dosage = how much co2 you were using. 2.Demand = how much does it take to do the job. 3.Residual = what's left over. |
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What is activated sludge
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Sludge that has become active by adding something into it (Air)
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In pumps what causes cavitation
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The collapsing of air pockets in liquid
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Why are two kinds of maintenance
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Emergency or reactive and preventive
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What does psi stand for
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Pounds per square inch (1 psi = 2.31 ft)
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What is the main cause of motor failure
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Over lubrication
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What is the most common electrical motor used
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Squirrel Cage Induction motor
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What is the most common type of valve used
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Gate Valve
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How does a gate valve operate
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All the way open or all the way closed
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What is dangerous about f2f as in a lift station
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Has a rotten oder but quickly deadens your smell
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At what temperature do organic solids burn
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550 degrees centigrade
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How can organics be broken down
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By bacteria
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What is peak flow
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The highest sustained flow for a 2 hour period
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What do you have to do if you have a bypass
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1. Call tceq within 24 hours.
2. Write a letter within one week; explaining location, how much was bypassed, your permit number, what caused the bypass, what was done to minimize the effects, what will be done to prevent other occurrences |
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What is absolute pressure
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Atmospherics and gauge pressure added together
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What must be done to a man hole in a flood plain
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It must be gasketed and bolted down
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In a plant why I have a grit chamber
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To protect your pumps
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What kind of bacteria are found an old sludge
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Nitrosomonas and nitrobactr
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Where does bacteria in activated sludge plant come from
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Raw sewage
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What is the recommended nomadic injector flow
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150 GPM
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Is a leaking packing on a pump normal
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Yes
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Bubbler or pneumatic controls: controls levels but also controls
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The alarm
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What is a disadvantage of using plastic or ABS pipe
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The resin or polyethylene can break down
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What are some problems caused by too small of a force
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1. higher velocity
2. possible water hammer 3. may have to use larger thrust blocks 4. might need a second pump |
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What is a disadvantage of clay pipe
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It's not available in most standard lengths
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What is the velocity recommended for an inverted siphon
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3 ft per second
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What is desecrator used for
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Drying
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Is vapor pressure of defused air in a aeration basin higher or lower in the winter
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Higher, so you can use the same amount of air as oxygen
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What is the advantage of a COD test over a BOD test
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It's faster
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What is the Sludge Volume Index
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The volume of 1 gram in mils after 30 mins of settling
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When is PPM (parts per million) and MGL (milligrams per liter) used
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When adding chemicals for dewatering sludge
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What is molar solution
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1 gram molecular weight in 1 liter
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What is a stability test used for in sludge
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It changes the mixed liquor ss quality
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Why is the BOD test used today
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Because it has been historically used in the past
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What do you use to heat and anaerobic digester
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A hot water jacket
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What are two common causes of bulking
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Too much air and old sludge
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Each person contributes ________ to the wastewater treatment plant
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8.34 pounds of TSS/day and (or) 0.17 pounds of BOD/day
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A function of TCEQ is to
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Set rules for waste discharge
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Who issues wastewater permits in the state of texas
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TCEQ
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Who is authorized to sign monthly discharge reports
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Plant operator and the executive office
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A grit chamber needs to be washed down because
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Organic matter clings to it
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Aerobic bacteria requires a environment with
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With dissolved oxygen
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What is the most common type of pump used
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Centrifugal
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What causes ponding in a trickling filter
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Algae growth on the media
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What should the minimum separation be between sewer and water lines
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9 feet
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What dose a imhoff tank consiste of
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tanks, vents and weirs
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The state agency responsible for enforcing pollution control laws in Texas
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Texas Commission on Environmental Quality
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The term pathogen means
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Disease-causing
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The minimum separation between sewer lines and potable water lines is
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9 feet
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A license wastewater operator is a professional who
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Constantly does the best job possible, practices personal safety, strives to improve job knowledge, strives to keep the plant and collection system in the best appearance in working orderection system in the best and parents in
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The biochemical oxygen demand of a sample is based on
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Measuring the dissolved oxygen used
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What is the most important role of aerobic bacteria in the treatment of wastewater
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Decompose organic matter
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A preferred and most common method of cleaning sewer is
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Hydro jet cleaner
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Which of the following are dangerous gases that are likely to be present in lift stations and or manholes
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Methane gas, petroleum fumes, hydrogen sulfide and carbon dioxide
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What are ways to reduce bad odors coming from the collection system
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Routinely cleaning slow running or low flowing lines and adding chlorine or hydrogen peroxide to the collection system
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the results of biochemical oxygen demand sample taken at a treatment plant tells the operator |
How the plant was operating 5 days ago |
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__________ would contribute to infiltration in a collection system
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Breaks in the main, high ground water levels and heavy rains
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