How many types of aerators are commonly used in the treatment of wastewater?
Explanation: There are 4 types of aerators namely Gravity aerators, Spray aerators, Diffusers and Mechanical aerators.
Organic contaminants are removed from the wastewater by
Explanation: Organic contaminants are removed from the wastewater by the attraction and accumulation of one substance on the surface of another.
By which process, odor producing substances is oxidized?
Explanation: By addition of chlorine dioxide to wastewater, odor producing substances is oxidized.
Which of the following process is used to remove the colloidal particles from the effluent?
Explanation: Chemical coagulation is used to remove colloidal particles by the use of coagulants which increase the particle size and they settle down.
In which form of solute stabilization, hydrogen sulfide in effluent is oxidized into sulfate?
Explanation: By the process of chlorination, effluent gets stabilized by the conversion of hydrogen sulfide into sulfate.
In which unit operation, gases are released or absorbed in the effluent?
Explanation: In Gas transfer, gases are released or absorbed in the effluent by exposing the wastewater through aeration under normal, increased or reduced pressure.
In which process, excess lime is converted into bicarbonate?
Explanation: By Re-carbonation of water softened by excess lime treatment, excess lime is converted into bicarbonate.
Flocculation of iron from water by addition of lime is an example of which of the following process?
Explanation: Chemical precipitation removes the dissolved substance from the effluent through ion transfer where precipitation of dissolved impurities takes place.
Which form of solute stabilization occurs when effluent passes through limestone?
Explanation: When effluent passes through limestone, carbon dioxide in excess get converted into soluble bicarbonate.
Solids are removed from the wastewater by which of the following unit operation?
Explanation: During solids transfer, solids are removed from wastewater by straining, sedimentation, flotation and filtration.