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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 |
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Rosolic acid |
Added to media to inhibit growth of non fecal coliform bacteria |
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Fecal coliform has no... |
Standard |
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Autoclave setup |
If set time is for 12-15 minutes , wait 45 minutes to open or get the sample |
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How long do you give the autoclave to get to full pressure |
30 min |
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Unit of measure for settable solids |
mL/L |
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TSS is dried at |
104 degrees Celsius |
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What does the ash represent when sample testing |
Inorganic portion of the sample |
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Total dissolved solids drying temp |
180 degrees Celsius |
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Primary treatment can remove |
95 to 99% of settleble solids and 40 to 60% of suspended solids |
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Minimum intake velocity and why |
2 ft per SEC, so that it doesn't settle |
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volatile solids testing |
550 degrees Celsius in muffle furnace for 15 to 20 min |
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What contains the strongest amount of seed for BOD sample ? |
Mixed liquor |
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FAS is |
Ferrous Ammonium Sulfate |
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The lower the pH is the _____ aggressive the chlorine acts |
More |
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Acetic acid reagent |
To lower the pH to bt 3 and 4 |
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Potassium iodide (KI) reagent |
Reacts with chlorine |
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0.1 normal sodium thiosulfate reagent |
Chloroform added to decrease bacterial contamination |
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Potassium bi-iodate or potassium dichromate reagent |
Used to standardize the sodium thiosulfate |
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0.01 normal or 0.025 normal sodium thiosulfate reagent |
Titrant. Prepared from 0.1 normal |
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Starch solution reagent |
Indicator |
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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 |
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What is the titrant of COD? |
Ferrous Ammonium Sulfate |
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What is the titrant for DPD? |
Ferrous Ammonium Sulfate |
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pH is the measurement of |
Hydrogen ion activity |
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pH scale changes |
Each unit change represents a 10x change --- pH 8 to a pH 5 = 10 x 10 x 10 x = 1000 times |
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What is the endpoint of alkalinity ? |
pH of 4.5 |
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0.02 N = |
N/50 |
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0.1N = |
N/10 |
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First gases released in anaerobic digestors |
Carbon dioxide and hydrogen sulfide |
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Sulfuric acid does what to salt bonds |
Breaks up |
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Hydrogen sulfide and co2 released during distillation gives |
A positive error |
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Nitrification |
NH3 to NO2 to NO3 |
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Denitrification |
NO3 to NO2 to NO to N2 |
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3 ways to look for Ammonia |
Ion selective electrobe, colormetric, titrate |
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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 |
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Total Kjeldahl Nitrogen (TKN) |
Sum of ammonia and organic nitrogen |
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Filtration |
Wash membrane filters by soaking in distilled water before use |
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Conductivity should be measured at |
25 degrees Celsius |
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Wheatstone bridge method measures which of the following |
Specific conductants |
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Class A fires |
Wood , paper , textiles, |
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Class B fires |
Grease , oil, paint |
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Class C fires |
Electrical equipment and where electricity is present |
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Class D fires |
Sodium , zinc , magnesium , |
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DO sag curve refers to |
Depletion in DO that occurs in a stream receiving organic wastes |
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Detritus is common name for |
Grit, or heavy coarse material by waste water |
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Trickling filters are |
Not easily upset by shock loads but are affected by temp changes |
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Since reaction rates are lower , operator of an activated sludge plant during winter will usually maintain |
Higher MLSS |
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Overall long-term success or failure in operating activated sludge plant depends largely upon proper control of |
Mass of active organisms in the plant |
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Bubbles noted throughout the chlorine contact tank , most probable cause is |
Decomposition of sludge deposits |
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Settable and floating organic solids are removed in |
Primary treatment |
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Solids that are subject to decomposition are |
Organic |
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Parshall flume measures flows in |
Open channels |
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The V Notch weir is particularly suited for |
Measuring very low flows |
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BOD reduction through the secondary treatment plant should normally range |
85-95% |
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Best operation in mesophillic range , temp of anaerobic sludge should be |
105 - 115 degrees Fahrenheit |
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Supernatant |
Liquid that separates from the solids during sludge digestion |
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Velocity in a grit chamber should be maintained at about |
1 foot per second |
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Dynamic head is |
Water moving |
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Static head is |
Water at rest, height of water |
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Optimum pH range for anaerobic sludge digestion is |
6.8 to 7.4 |