ME – 130

*ME130*

I Semester M.E. (Civil Engg.) Degree Examination, July 2016 Major : (Environmental Engineering) 2K8 EN 102 : ENVIRONMENTAL CHEMISTRY AND MICROBIOLOGY Time : 3 Hours

Max. Marks : 100 Note : 1) Answer any five full questions, choosing at least two from each Part. 2) Missing data may be assumed. PART – A

1. a) Discuss the sanitary significance of the following parameters : 1) Nitrates 2) 3) 4) 5)

COD Residual chloride Colour Iron.

b) Explain the procedure to determine : a) Iron b) D. O. in the laboratory.

(10+10)

2. a) Explain the characteristics of equilibrium constant. b) Give the application of dissociation constant and solubility product. c) The solubility product of CaSO 4 at 25°C is 6.25 × 10 –5. Determine the concentration of the salt, ignoring the ionic strength of the solution, but taking account of activity co-efficients. (8+6+6) 3. a) Explain the order of chemical reactions with relevant equations. b) Discuss the difference between order of chemical reaction and molecularity. c) Nitrogen peroxide when allowed to decompose in an inert solvent gave the following volumes of oxygen. Show the reaction is of I order. What volume of oxygen will be present after 30 minutes ? t(min)

–0– 5 ––

10 – –

15 – – ∞ (infinity)

vol (ml) – 0 – 3.42 – – 6.30 – – 8.95 – – 34.75

(8+8+4) P.T.O.

*ME130*

ME – 130 4. Write short notes on any four : 1) Adsorption theory 2) Degradation of food stuff 3) Corrosion control techniques 4) Atomic absorption spectrophotometer 5) Sampling 6) Electrical double layer.

(4×5=20) PART – B

5. Discuss in detail the application of applied microbiology in water supply schemes, waste water schemes and solid waste management. 20 6. a) Sketch and label the bacterial growth curve for a pure culture, also explain the significance of each phase. b) List the characteristics and application of : 1) Fungi 2) Algae 3) Protozoa.

(8+12)

7. a) Discuss in detail the classification of bacteria. b) Explain the role of enzymes.

(14+6)

8. Write short notes on any four :

(5×4)

i) Monod’s equation ii) Flagella iii) Indicator organisms iv) Plasmolysis v) Prokaryotes-eukaryotes vi) Cell metabolism. ________________