Environmental Engg‑II (CE-702 (B)) - Important Questions

What do you understand by unit operations and processes? Enumerate the various unit operations/processes and treatment systems used for wastewater treatment.

Explain the four types of settling/sedimentation in wastewater treatment and discuss the criteria for selecting among them.

Explain the theory and design of preliminary treatment units such as screens, grit chamber, sedimentation tank and chemical clarification.

The effluent from a primary settling tank is applied to a standard-rate trickling filter at the rate of 5 MLD having BOD5 of 150 mg/L. Determine the depth, volume and diameter of the filter adopting suitable hydraulic and organic loadings. Also estimate the efficiency using NRC formula.

Differentiate clearly between attached growth processes and suspended growth processes. List various treatment techniques falling under each process.

What is meant by activated sludge? Describe with neat sketches the treatment of sewage by activated sludge process (ASP).

Explain with the help of a neat sketch the working of an oxidation ditch, including its various configurations.

Why is it necessary to remove nitrogen from secondary plant effluent? Explain the biological nitrification-denitrification processes/methods for nitrogen removal.

What are the main mechanisms by which activated carbon removes contaminants from water? Discuss the factors affecting its adsorption capacity.

Differentiate ultrafiltration from microfiltration and reverse osmosis in terms of pore size, separation mechanism and typical applications.

Enumerate the different major air pollutants, their characteristics, sources and health effects on human beings in a tabular form.

What is photochemical smog? Explain its formation mechanism, major constituents and harmful effects on environment and human beings.

Discuss the effects of air pollution on human health, vegetation and materials.

A coal fired 800 MW power plant is operating at about 38% efficiency. The ash and sulphur content in the coal used are 38% and 4% respectively and calorific value is 21 MJ/kg. Find the emission rate of SO2 and quantity of ash generated per day.

Define air pollution. Explain primary vs secondary sources of air pollutants with suitable examples.

What do you understand by atmospheric dispersion? Write down the Gaussian plume equation for determining ground-level/downwind concentration of pollutant and indicate the location of maximum concentration.