Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
ME SEMESTER IV EXAMINATION SUMMER 2019
Subject Code: 2741801 Date: 03/05/2019
Subject Name: Anaerobic Biotechnologies
Time: 02:30 PM To 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q-1

Explain role of following bacteria in anaerobic digestion along with chemical reactions:
hydrogenotrophic methanogens,
acetotrophic methanogens, and
methylotrophic methanogens
7

Give the difference between anaerobic fluidized bed reactor and expanded bed reactor.
7
Q-2

Explain the effect of pH and temperature on anaerobic treatment process.
7

Enlist different treatability parameters for anaerobic treatment and explain each in detail.
7
OR

Write a short note on sources of methane in anaerobic process.
7
Q-3

Write applications of BMP test.
7

Write the procedure of BMP test with its advantages.
7
OR
Q-3

Explain anaerobic toxicity assay test.
7

Give difference between anaerobic processes and anoxic processes.
7
4

Briefly explain the rate limiting steps in anaerobic treatment system.
7

Explain how the bacteria in anaerobic treatment are interdependent on each other to maintain the stability of process.
7
OR
Q-4

Why post treatment is generally required after anaerobic treatment? Explain its methods.
7

Draw the figure of UASB and write importance of each component.
7
Q-5

Explain bi-phasic anaerobic digestion with figure.
7

Enlist and explain environmental factors of pH based bi-phasic anaerobic digestion.
7
OR
Q-5

Give difference between EGSB and IC reactor.
7

Write the difference between High Rate Anaerobic Reactor and Standard Rate Anaerobic Reactor.
7