WASTE MANAGEMENT QUIZ 4

Attempt now to get your rank among 0 students!

Question 1:

Cell Residence Time (CRT) defined as the average length of time in days that an organism remains in the secondary treatment system. As the CRT increases, complexity and size of organisms

Remain same

Decreases

Increases

First increases and then decreases

Question 2:

A waste to be called toxic, acute inhalation LC50 concentration should be _______ ppm.

more than 2200

less than 4300

more than 2400

less than 10000

Question 3:

What is the principle of Bioremediation?

To use microorganism to take in contaminated substances from the environment

Growing plants on contaminated sites

Addition of pregrown microbial culture

Use of plants to remove or destroy contaminants

Question 4:

The F/M ratio is a process control number that helps you to determine the proper number of microorganisms for your system. A low F/M ratio indicates

Large number of micro-organisms

Less number of micro-organisms

Large amount of incoming food

Both 1 and 3

Question 5:

Foam formation and poorly settling sludge are the two most common problems of the activated sludge process. A sludge that exhibits poor settling characteristics is called a

Bulding sludge

Sedmentation sludge

Chemical sludge

Bulking sludge