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121 Cards in this Set
- Front
- Back
- 3rd side (hint)
How long do you retain lab records
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3 years
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retain Bio-solids records for how long?
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5 years
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what is vector control
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to control the way disease travel (files and rodents) organisms that carry disease
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nutrient needed for bio-mass
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100 lbs of BOD5 lbs of BOD1 lb of phosphorus
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probe used with portable D.O meter
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polargraphic
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how many lbs of oxygen is needed for each lb of ammonia nitrogen converted?
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4.6 lbs of oxygen
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how many lbs of alkalinity for each lbs of ammonia nitrogen converted
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7.1 lbs of alkalinity
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what does EPA 600 refer to?
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monitoring organic chemicals (pollutants)
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flow measuring for primary sludge
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magnetic meter (cylinder with no impeller)
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How many ft should limit the total suction lift on a centrifugal pump?
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15 ft
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valve names are derived from what?
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internal components (ball, plug, butterfly, etc.)
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windrow sludge composite
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55*C for 15 days
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What do you do before entering a confined space?
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if no vent holes, the vent should be opened enough to insert sampling hose, test for oxygen (19.5%), check for explosive and toxic gasses
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on an MSDS, what does TWA (Time weighted Average) mean? `
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strength of a chemical you can withstand for 8 hours
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on an MSDS, what does TLV (threshold limit value) mean?
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level of airborne substance to which workers can be exposed to without causing heath problems
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what is the holding time for nitrate?
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48 hours
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what is the holding time for BOD
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48 hours
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what is the holding time for alkalinity
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14 days
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how do you preserve an oil and grease sample
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titrate with sulfuric acid (H2SO4) or Hydrochloric Acid (HCl) to pH <2 up to 28 days.
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how do you preserve an ammonia sample?
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titrate with sulfuric acid (H2SO4) to pH <2 up to 28 days
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what does 40 CFR part 136 refer to?
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40CFR136 refers to requirements for preservation, techniques and max holding times
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what is oxygen transfer rate based on?
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rate is based on rate of flow
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how long should land application records be kept
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5 years
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Fushing water on a pump to clean or prime should be more than what? |
more than the discharge rate |
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pump elevation above source should never exceed _____ ft
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22 ft no more than 20-30ft
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plant influent increased during rain event is called ____
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inflow sidenote: it will not be infiltration - high water table
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what are large clumps of rising sludge in secondary clarifiers
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denitrification
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what is the holding time for pH
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no holding time, analyze immediately within 15 minutes
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Organic material in plant effluent increases ______ demand
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Chlorine
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what prevents internal leakage on a centrifugal pump?
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wear rings
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what are the two components of anaerobic digester gas?
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methane gas and carbon dioxide
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mercury sulfate added to COD samples are to remove what?
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chlorine interference
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specific conductance provides an estimation on _____
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dissolved solids
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what is digestion?
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process by which a sample is heated in the presence of a strong acid to break down into a simple compound
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what is the incubation temp for fecal coliforms
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44.5 +/- 0.2 *C
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total alkalinity pH?
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4.5
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what do you use to restore readings in a liquid in a column thermometer?
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dry ice
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what is the chain of custody
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document that has time of collection until the time of disposal
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process of denitrification
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NO3 --> NO2 --> N2
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the outer bearing race on shaft of centrifugal pump does not ____
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move
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denitrification is the anoxic biological reduction nitrate nitrogen to nitrogen gas. What is the D.O. (dissolved oxygen) through the process
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anaerobic <0.1 DOanoxic 0.1 - 1.0 DOaerobic >1.0 DO
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nephelometer measures light reflected at _____ degree angles
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90*
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Conductivity is measured at ___*C
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25*C
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what is used to provide quicker results than a settlometer to determine sludge concentration?
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centrifugation
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repair kit for a 1 ton cl2 cylinder?
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repair kit B (yellow box)
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repair kit for a 150 lb cl2 cylinder
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repair kit a (red box)
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what is the purpose of heating and mixing a primary anaerobic digester is to increase what?
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digestion rate (destruction of volatile solids)
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Ground water tests should be performed to prevent takes from _______
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floating up
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phosphorus is an essential element for plant growth and may stimulate ______ growth in receiving streams
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algae
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polymer most commonly used in sludge dewatering
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cationic polymer
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fine dispersed flock in the secondary clarifiers indicates ____ sludge.
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old
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what do you need to do if you have old sludge
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you need to increase wasting
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what do you call the area in a stream below discharge that is considered the mixing area
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degradation area
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Most accurate specific number
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0.009 rounded 0.01
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BOD measures the amount of oxygen microorganisms require in ____ days to break down sewage
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5 days
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What are the 3 methods used to test chlorine?
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amerometric (best method)idometricDPD (most common)
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what type of container should you keep your stock solutions in?
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reagent bottles
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what is TKN (total kjeldahl Nitrogen)
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the measurement of ammonia nitrogen and organic nitrogen (total nitrogen)
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purpose/function of fume hood
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used for volatile substances with TLV of less than 50 ppm/ minimum less than 100 ppm
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preservation of a metals analysis sample
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acidify with nitric acid to pH <2 - minimize moisture and adsorption on container walls
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level controls - bubbler system - air tubes... if the level remains low and the system is damaged, what could it mean?
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there could be a hole in the system
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measure suction lift of pump from where to where?
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water surface to pump centerline or center of volute or impeller
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MATH: pump 1000 gals with 3% solids, replace with new pump capable of pumping 6% solids, how much will you need to pump to maintain plant performance?
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c1v1=c2v2 500 gals
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phosphorus and nitrogen have what similar characteristics
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stimulate algae growth
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What kind of exceedance are allowed in the mixing area of the receiving stream
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mortality test or toxicity test
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2 parts of a mechanical seal
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rotating ring assembly and stationary assembly
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pH of borate buffer solution in an ammonia test
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9.5
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polymer used in activated sludge process
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cationic
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how to count coliform/100mL
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count coliforms (has to be within 20-60 range), multiply by 100, divide by mL used
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coliform analyses hold time for wastewater
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6 hours
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what kind of sample is Oil & Grease and what type of container do you use?
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grab sample in a glass container
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How does activated carbon remove organics
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ion exchange adsorption absorption
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why is cl2 pH dependent?
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cl2 is more effective in a low pH (acidic) environment, so the lower the pH, HOCl (hydrochlorious acid) is more prevalent
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when pH at the plant is 6.1 and rises to 9.3 and a large industrial plant has reported a spill, what is the likely cause?
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NaOH - Sodium hydroxide/caustic soda
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what causes hydrogen sulfide in a collection system?
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bacteria - sulfates with the absence of D.O
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RBC unit with 25% more on 1st stage, what should you do?
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do nothing (normal - loading is the front)
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what type of bugs do you find in well balanced, good settling mixed liquor?
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amoeboids, flagellated, rotifers, free swimming ciliates, crawling, carnivorous free swimming ciliates, stalked ciliatedsidenote: you do NOT want nematodes, or filamentous bacteria
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anoxic zone precedes an aerobic zone, contents are recirculated back to the head of the anoxic zone for what?
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to provide oxygen in the anoxic zone to ensure that denitrification takes place in the appropriate location
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personnel working in sludge compost plant should wear masks for what reason?
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hydrogen cyanide - smells like almonds- colorless gas or bluish-white liquid with a bitter almond odor
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why is ozone generated on-site?
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it is unstable
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D.O of 6.5% is considered what?
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supersaturated
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at pump station with waste turning septic, should you move the floats closer together or further apart?
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closer together to cycle more
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why are flumes preferred over weirs?
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less maintenance - more accurate
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increased glow into primary clarifiers will do what?
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detention time +/- and surface loading +/-
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what is the best source of seed water for BOD analysis?
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effluent or mixed liquor or supernatantinfluent or primary effluent
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which activated sludge process can withstand high industrial loads?
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oxidation ditch - extended air
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NPDES requires 3 samples but you pull 5, how many do you report?
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ALL OF THEM
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what type of pump is used to pump primary sludge to digesters?
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positive displacement
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2 pumps with variable feed drives (VFDs) with 1 pump running should be able to pump _______
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maximum average/ half design
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100% transmittance equals _____% absorbance (spectrophotometers)
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0%
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bar screen trouble shoot?
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shear pin
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centrifugal pump impeller running backwards equals _______
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less flow
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rotation backwards on 3 phase centrifugal pump
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swap any 2 leads
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erratic performance in air tools
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moisture or water in tools
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accident in plant 1st thing supervisor should do?
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seek treatment - determine if there are any injuries
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impeller for pumping sludfe
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open or closed
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three parts to alkalinity
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hint: to solve look on the water conversion list that is given with the test
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a hose connected to a faucet submerged could contaminate the potable water supply by ______
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back feed through syphoning or backflow.
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math normality
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answer is 1.5 (10N, 50mL of reagent, and 850 mL of water)
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math - % volatile solids... volatile solids of 75% with a 4 % concentration after digestion 50% volatile solids remaining . what is the percent reduction? |
67% |
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chemical feed pump
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diaphragm pump
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increased chlorine demand in the effluent is caused by high ______ |
high nitrites |
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math: 9.2 MGD each clarifier has 280 linear feet of weirs - total of 2 clarifiers only two online
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answer is 16,400 ft/sec
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trouble shoot a 1 ton cl2 cylinder- frost on the line and the cylinder
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the feed rate is too high!
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math- convert feet of head into psi - 184 head ft is ____?
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_____psi
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as alum is added alkalinity (decreases/increases) ph (decreases/increases)
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decreasesdecreases
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what do mud balls do on the filter?
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decreases filter area
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how are settleable solids reported?
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mg/L
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how much UV disinfection do you use?
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enough needed to disinfect, same about as chlorine used to disinfect
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what do industrial permits regulate?
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non-domestic waters
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with disaster planning, occurrences of risk use assessments which are needed to determine?
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appropriateness, probability, timing
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why should pumps run as long as they can?
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prevent wear and tear on valves, prevent thrust from water buildup
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how do you measure total volatile solids?
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difference between dry weight and ash weight
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holding time for settable solids
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48 hours
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centrifugal pumps run with velocity and ______
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? |
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ammonia = 2, nitrates = 5, nitrites = 100 what is going on?
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jar test measure
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how much does of a coagulant is needed
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what should be run with every lab test
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blank, standard, duplicate
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if BOD depletion exceeds 0.2 mg/L, what could be the possible problem?
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contamination in BOD possible
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things you need to look up: wet wells, MCRT math, Weir loading rate math, dosage math
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What is a negative pressure respirator? |
A negative pressure respirator means any tight-fitting respirator in which the air pressure inside the facepiece is negative during inhalation with respect to the ambient air pressure outside the respirator. |
N95 |