What is the COD loading rate assumed for an Up flow anaerobic sludge blanket (UASB)?

Up flow anaerobic sludge blanket reactor is an anaerobic digester which is used for wastewater treatment with the help of suspended sludge blanket filters.

A

True

B

False

Calculate the volume for the UASB with the following details. Flow: 120m3/h COD: 350 mg/L UASB load considered: 6 Kg COD/ m3

A

7 m3

B

8 m3

C

8.5 m3

D

9 m3

Calculate the volume for the UASB with the following details. Flow: 240m3/h COD: 350 mg/L UASB load considered: 8 Kg COD/ m3

A

7.5 m3

B

8.0 m3

C

10.5 m3

D

9.5 m3

Statement (I): Anaerobic sludge digester, by itself, is considered to be the better method than other methods of sludge treatment: Statement (II): During anaerobic sludge digestion, CH4 is produced; also rodents and other pests are attracted when digester sludge is dried.

A

Both Statement (I) and Statement (II) are individually true; and Statement (II) is the correct explanation of Statement(I)

B

Both Statement (I) and Statement (II) are individually true; but Statement (II) is NOT the correct explanation of Statement (I)

C

Statement (I) is true; but Statement (II) is false

D

Statement (I) is false; but Statement (II) is true.

In the question below are given two statements followed by three conclusions numbered I, II and III. You have to take the given statements to be true even if they seem to be at variance with commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts. Statements: No blanket is bedsheet No chair is blanket Conclusions: I. Only blanket is bedsheet II. Few blanket are chair III. No bedsheet is chair

A

Only II follows

B

Only I and either II or III follows

C

Only III follows

D

Both I and II follows

E

None follows

In the following question below are given three statements followed by four conclusions. Taking the given statements to be true even if they seem to be at variance from commonly known facts, read all the conclusions and then decide which of the given conclusion logically follows the given statements. Statements: I. 0% Jacket is Black. II. 100% Black are Blanket. III. 30% Blanket are Cotton. Conclusions: I. No Blanket is a Jacket. II. Some Black are Cotton. III. Some Cotton are Jacket. IV. Some Jacket are Blanket.

A

Only I follows

B

Only II follows

C

Either I or III follows

D

Either I or IV follows

A blanket is marked at 25 percent above its cost price and after allowing a discount of 12 percent on its marked price, shopkeeper sold the blanket at Rs.180 profit. What is the marked price of the blanket?

A

Rs. 2250

B

Rs. 2375

C

Rs. 2500

D

Rs. 1875

The statements below are followed by two conclusions labeled I and II. Assuming that the information in the statements is true, even if it appears to be at variance with generally established facts, decide which conclusion(s) logically and definitely follow(s) from the information given in the statements. Statements: All bed is bed sheet. No bed is blanket. Some blanket is comforter Conclusion I: No comforter is bed. Conclusion II: Some blanket is bed sheet.

A

Only conclusion II follows

B

Only conclusion I follows

C

Neither conclusion I nor conclusion II follows

D

Both conclusions I and II follow

Which of the following are claimed as advantageous in respect of aerobic sludge digestion as compared to anaerobic sludge digestion? 1. Lower BOD concentration in supernatant liquor 2. Production of a sludge with excellent dewatering propensity. 3. Greater production of methane 4. Lesser operating cost 5. Lesser capital cost Select the correct answer using the codes given below:

A

(1), (2) and (4)

B

(2), (3), (4) and (5)

C

(3), (4) and (5)

D

(1), (2) and (5)

Which of the following parameters are employed in the design of Trickling filter? a. Hydraulic loading rate b. Organic loading rate c. Detention time d. Weir loading rate

A

a, b, c and d

B

a and b only

C

b and c only

D

c and d only

What is the COD loading rate assumed for an Up flow anaerobic sludge blanket (UASB)?

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