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;
19 Cards in this Set
- Front
- Back
|
A good secondary effluent has BOD and TSS less than _____ to _____ mg/L |
20 to 25 mg/L |
|
|
When a flow increases significantly switching to _______ _______ _________ may be needed to keep from losing AS. |
Step feed aeration |
|
|
When solids loading increases the _______ may need to be increased by reducing the sludge wasting rate. |
MLSS |
|
|
DO in the airason tank to keep a good effluent should be maintained at ___ to ___ mg/L. |
2 to 4 mg/L |
|
|
White foam.... |
Reduce solid watering |
|
|
Thick, dark foam.... |
Increase wasting |
|
|
Typical lab results, COD |
Conv. A.S. Influent- 250 to 1,000 mg/L Primary effluent- 200 to 400 mg/L Final effluent- 30 to 70 mg/L |
|
|
Typical lab results, BOD |
Conv. A.S.Influent- 150 to 400 mg/LPrimary effluent- 100 to 280 mg/LFinal effluent- 10 to 20mg/L |
|
|
Typical lab results, SS |
Conv. A.S.Influent- 150 to 400 mg/LPrimary effluent- 60 to 160 mg/L Mixed liquor- 1,000 to 4,500 mg/L Return sluge- 2,000 to 10,000 mg/LFinal effluent- 1 to 20 mg/L |
|
|
Typical lab results, DO |
Mixed liquor- 0.5 to 4 mg/L Final effl.- 2 to 6 mg/L |
|
|
Typical lab results, Chlorine Residual (30 min) |
Final effluent <0.1 to 2.0 mg/L |
|
|
Typical lab results, |
A |
|
|
Typical lab results, pH |
Influential. 6.8-8.0 Effluent. 6.9-8.5 |
|
|
Typical lab results, |
A |
|
|
High-rate |
*operates at the highest loading rate. * sludge age from 0.5 to 2.0 days *produces a lower quality effluent *more easily upset and requires tighter control and more testing |
|
|
Conventional |
*most common type use today *loading is app. 50% lower than than high rate *sludge age from 3.5 to 7 days *high quality of effluent. *able to absorb some shock loads without lowering effluent quality. |
|
|
Extended aeration |
*often used in smaller package type plants or complete oxidation systems *most stable of the tree processes due to light loading *sludge age is greater than 10 days *SS are usually higher than conventional |
|
|
Primary treatment removes _____ to ___% BOD5 and _____to____% of TSS. |
20 to 35 % BOD5 and 60 to 75% TSS |
|
|
Grease deposits can be removed by using _______. |
Trisodium phosphate (TSP) |
