What are the sources of Noise pollution ? What are the ways to control noise pollution at source?
What do you understand by Global warming? Discuss the problems of global warming on environment and on human being.
What are the limiting values of common air populants? Describe the ill effects of air pollution on human health.
Draw a neat sketch of intercepting trap and explain its working.
Draw a neat sketch of one pipe, two pipe and single stack system of plumbing. Which system is best suitable for your locality and why?
Waht is the importance of providing water seal in trap, give causes of failure of water seal and its remedial measures?
What is oxygen sag curve ? Draw typical oxygen sag curves of the following situations:
1. River turning sptic on discharge of waste.
2. River receiving domestic sewage having good dilution anf flow.
What do you understand by Digestion of sludge? Differentiate between anaerobic and aerobic digestion. Explain the machanism of anaerobic digestion.
The sewage is flowing at the rate of 4.8 million liters/day from a primary clarifier to a standard rate trickling filter.
The 5 day BOD of the influent is 180 mg/l. The value of organic loading may be taken as and surface loading rate as . Determine the volume of the filter and its depth. Also calulate the efficiency of this filter unit.
What is the purpose of providing septic tank? Draw a neat sketch of septic tank and explain the working of the same.
Design an oxidation pond to treat waste water from a community of 15000 people with a B.O.D Contribution of 45 grams/capita/day.
Water is supplied at a rate of 180 liters per capita per day. Determine the detention time and also whether the effluent is suitable for irrigation if 80% B.O.D removal is achived.
1. Pond's L:W 4:1
2. Depth of pond = 2m
3. Permissible BOD <= 100mg/l for irrigation water
4. Permissible BOD loading rate is 200 kg/hectare/day.