What is sewage ? In which way can sewage be harmful to us ?

What is the temperature at which carbon can be used as a reducing agent for FeO ?

Study the given differences between primary sludge and activated sludge and select the incorrect ones. Primary Sludge Activated sludge (i) It is sludge formed during primary sewage treatment. It is sludge formed during secondary sewage treatment. (ii) It possesses flocs of decomposer microbes. It does not possess flocs of decomposer microbes. (iii) It does not require aeration. Formation of activated sludge requires aeration. (iv) A lot of decomposition occurs during formation of primary sludge. Very little decomposition occurs during formation of activated sludge.

What is 'Acid Rain' ? What are its harmful effects ?

What are the various constituents of domestic sewage? Discuss the effects of sewage discharge on river.

Before disposal, sewage is treated in sewage treatment plants(STPs). It is done by which microbes present naturally in sewage:

Why does the oxygen concentration in the water decrease when sewage is dicharged into a river?

What are freons ? What are their harmful effects on the environment ?