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