Home
Class 12
BIOLOGY
Read the following statements about acti...

Read the following statements about activated sludge.
a. It is the effluent passed from anaerobic digester to the settling tank.
b. A small part of activated sludge is pumped into large tanks called anaerobic sludge digesters.
c. A small part of activated sludge is pumped back Into the aeration tank to serve as inoculum. Which of the above statements are incorrect?

A

a & c

B

a & b

C

b & c

D

a, b & c

Text Solution

AI Generated Solution

Promotional Banner

Similar Questions

Explore conceptually related problems

Which of the following is True/false A small part of activated sludge is pumped into large tank called anaerobic sludge digesters.

Why a small part of activated sludge is pumped back into the aeration tank during sewage treatment?

Activated sludge is A. formed after sequential filtration and sedimentation in primary setting tank. B. bacterial flocs settings after secondary treatment. C. Passed into anaerobic sludge digester.

Identify the True or False statements about the sewage treatment plants. I. The water is less polluted if BOD is high. II. Flocs are formed by anaerobic bacteria with fungal filaments in mesh-like structures. III. Activated sludge acts like an inoculum in activated sludge digesters. IV. In activated sludge digesters, gases like methane, hydrogen sulphide and carbon dioxide are formed.

Read the following statements w.r.t. biological treatment of sewage. Br a. Involves removal of sewage through sequential filteration. Br b. BOD of waste water is directly proportional to its a polluting potential. Br c. Constant agitation of primary effluent is carried out in large aeration tanks. Identify the incorrect statement(s)

Study the following statements and select the incorrect ones. (i) Physical removal of large and small particles through filtration and sedimentation is called primary sewage treatment. (ii) Secondary sewage treatment is mainly a mechanical process. (iii) Activated sludge sediment in a sewage treatment plant is a rich source of aeroic bacteria. (iv) Biogas, commonly called as gobar gas, is pure methane.

Read the following statements and answer thequestion following them. A)Chylomicrons are very small proteins coated by fat globules. B)During assimilation absorbed substances finally reach tisssues which utilise them for their activities. C) Defaecation is a voluntary process. How many of these statements are correct?

Read the following statements (A-D) (A) The stomach stores the food for 4-5 hours. (B) The food mixes throughly with the acidic intestinal juice (C ) Trypsinogen is activated by an enzyme-enterogastrone, secreted by the intestinal mucosa (D) Renin is enzyme found in gastric juice of infants which helps in digestion of milk protein How many of the above statements are wrong ?

State True (T) or False (F) for the following statements. a. Anaerobic digestion of activated sludge produces biogas inside the sludge digester. b. Rhizobium is used as a biofertilizer for raising production of soyabean crop. c.Organic farming uses only naturally produced inputs like compost.

Given below are the steps involved in sewage treatment. Arrange them in proper sequence and select the correct option. A. Passage of primary effluent into large aeration tanks for mechanical agitation and pumping of air. B. Passage of secondary effluent and formation of activated sludge. C. Physical removal of particles through filtration and sedimentation D. Release of effluent from the secondary treatment plant into natural water bodies. E. Growth of useful aerobic microbes into flocs which significantly reduce the BOD.