Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly _____________ substances?

Byadmin March 11, 2019August 29, 2021

Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly _____________ substances?

A. Radioactive
B. Organic
C. Inorganic
D. None of these

Chemical Environmental Engineering

TLV of ammonia, nitrogen dioxide and phenol vapor in air is ______________ ppm ?

TLV of ammonia, nitrogen dioxide and phenol vapor in air is ______________ ppm ?

A. 5
B. 100
C. 1000
D. 2000

Read More TLV of ammonia, nitrogen dioxide and phenol vapor in air is ______________ ppm ?
Chemical Environmental Engineering

Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream ?

Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream ?

A. Sedimentation tank
B. Circular clarifier
C. Mechanical flocculation
D. Chemical coagulation

Read More Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream ?
Chemical Environmental Engineering

______________ content of the phosphate rock is the pollutant of primary interest in a phosphatic fertiliser plant ?

______________ content of the phosphate rock is the pollutant of primary interest in a phosphatic fertiliser plant ?

A. Calcium
B. Fluorine
C. Phosphorous
D. Sulphur

Read More ______________ content of the phosphate rock is the pollutant of primary interest in a phosphatic fertiliser plant ?
Chemical Environmental Engineering

Lagoons used for purification of polluted water_______________?

Lagoons used for purification of polluted water_______________?

A. Are large shallow artificial lakes also known as clarification lakes, maturation ponds or
oxidation ponds
B. Use micro-organisms/bacteria in presence of dissolved oxygen
C. Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended
solid < 1 mg/litre and BOD = 3.8 mg/litre
D. All A., B. & C.

Read More Lagoons used for purification of polluted water_______________?
Chemical Environmental Engineering

Presence of dissolved impurities of ______________ is responsible for the red brownish color of water?

Presence of dissolved impurities of ______________ is responsible for the red brownish color of water?

A. Carbonates
B. Bi-carbonates
C. Iron & manganese
D. Arsenic

Read More Presence of dissolved impurities of ______________ is responsible for the red brownish color of water?
Chemical Environmental Engineering

Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants ?

Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants ?

A. NOx
B. Hg
C. SO2
D. F

Read More Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants ?

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