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61 Cards in this Set

  • Front
  • Back

Incubation for fecal coliform

44.5 +/- 0.2 degrees Celsius for 24 +/- 2 hours

Rosolic acid

Added to media to inhibit growth of non fecal coliform bacteria

Fecal coliform has no...

Standard

Autoclave setup

If set time is for 12-15 minutes , wait 45 minutes to open or get the sample

How long do you give the autoclave to get to full pressure

30 min

Unit of measure for settable solids

mL/L

TSS is dried at


104 degrees Celsius

What does the ash represent when sample testing

Inorganic portion of the sample

Total dissolved solids drying temp

180 degrees Celsius

Primary treatment can remove

95 to 99% of settleble solids and 40 to 60% of suspended solids

Minimum intake velocity and why

2 ft per SEC, so that it doesn't settle

volatile solids testing

550 degrees Celsius in muffle furnace for 15 to 20 min

What contains the strongest amount of seed for BOD sample ?

Mixed liquor

FAS is

Ferrous Ammonium Sulfate

The lower the pH is the _____ aggressive the chlorine acts

More

Acetic acid reagent

To lower the pH to bt 3 and 4

Potassium iodide (KI) reagent

Reacts with chlorine

0.1 normal sodium thiosulfate reagent

Chloroform added to decrease bacterial contamination

Potassium bi-iodate or potassium dichromate reagent

Used to standardize the sodium thiosulfate

0.01 normal or 0.025 normal sodium thiosulfate reagent

Titrant. Prepared from 0.1 normal

Starch solution reagent

Indicator

Iodometric direct method

Acetic acid added to sample to lower pH bt 3 and 4. About 1 gram of potassium iodide added . Chlorine liberates free iodine. Liberated iodine titrated with sodium thiosulfate/ starch

What is the titrant of COD?

Ferrous Ammonium Sulfate

What is the titrant for DPD?

Ferrous Ammonium Sulfate

pH is the measurement of

Hydrogen ion activity

pH scale changes

Each unit change represents a 10x change --- pH 8 to a pH 5 = 10 x 10 x 10 x = 1000 times

What is the endpoint of alkalinity ?

pH of 4.5

0.02 N =

N/50

0.1N =

N/10

First gases released in anaerobic digestors

Carbon dioxide and hydrogen sulfide

Sulfuric acid does what to salt bonds

Breaks up

Hydrogen sulfide and co2 released during distillation gives

A positive error

Nitrification

NH3 to NO2 to NO3

Denitrification

NO3 to NO2 to NO to N2

3 ways to look for Ammonia

Ion selective electrobe, colormetric, titrate

Ammonia info

Buffer sample to pH of 9.5 with a borate buffer. This decreases hydrolysis of cyanates and organic nitrogen compounds, which adds more ammonia to the sample

Total Kjeldahl Nitrogen (TKN)

Sum of ammonia and organic nitrogen

Filtration

Wash membrane filters by soaking in distilled water before use

Conductivity should be measured at

25 degrees Celsius

Wheatstone bridge method measures which of the following

Specific conductants

Class A fires

Wood , paper , textiles,

Class B fires

Grease , oil, paint

Class C fires

Electrical equipment and where electricity is present

Class D fires

Sodium , zinc , magnesium ,

DO sag curve refers to

Depletion in DO that occurs in a stream receiving organic wastes

Detritus is common name for

Grit, or heavy coarse material by waste water

Trickling filters are

Not easily upset by shock loads but are affected by temp changes

Since reaction rates are lower , operator of an activated sludge plant during winter will usually maintain

Higher MLSS

Overall long-term success or failure in operating activated sludge plant depends largely upon proper control of

Mass of active organisms in the plant

Bubbles noted throughout the chlorine contact tank , most probable cause is

Decomposition of sludge deposits

Settable and floating organic solids are removed in

Primary treatment

Solids that are subject to decomposition are

Organic

Parshall flume measures flows in

Open channels

The V Notch weir is particularly suited for

Measuring very low flows

BOD reduction through the secondary treatment plant should normally range

85-95%

Best operation in mesophillic range , temp of anaerobic sludge should be

105 - 115 degrees Fahrenheit

Supernatant

Liquid that separates from the solids during sludge digestion

Velocity in a grit chamber should be maintained at about

1 foot per second

Dynamic head is

Water moving

Static head is

Water at rest, height of water

Optimum pH range for anaerobic sludge digestion is

6.8 to 7.4