Wastewater Treatment Grade 1 Exam
Questions with Answers
The two most important factors impacting the effectiveness of chlorination are
a. pH of the water and the content of foreign substances in the water
b. concentration of chlorine and the content of foreign substances in the water
c. concentration of chlorine and contact time
d. pH and temperature of the wastewater - ✔✔
The treatment process that controls corrosion or scaling is known as
a. chemical control
b. stabilization
c. passivation
d. corrosion kinetics - ✔✔
Permanganate reactions are highly
dependent upon
a. organic in the water
b. pH
c. temperature
d. alkalinity - ✔✔
It is hard to kill the organism that causes which one of the following illnesses?
a. Cholera
b. Typhoid
c. Cryptosporidiosis
, d. Infectious hepatitis - ✔✔
Disinfection go water wells with free chlorine requires exposure for _____ at a concentration of
______.
a. 6 to 12 hours; 25 mg/L
b. 12 to 24 hours; 25 mg/L
c. 12 to 24 hours; 50 mg/L
d. 24 to 28 hours; 100 mg/L - ✔✔
Detention time in flocculation basins are usually designed to provide for
a. 5 to 15 minutes.
b. 15 to 45 minutes.
c. 45 to 60 minutes.
d. 60 to 90 minutes. - ✔✔
Alum works best in a pH range of
a. less than 4.0.
b. 4.0 to 5.5.
c. 5.8 to 7.5.
d. Greater than 9.0. - ✔✔
Which statement is true concerning colloidal particles?
a. Colloidal particles are so small that gravity has little effect on them
b. The zeta potential between colloidal particles is balanced by covalent bonding
c. Electrical phenomenon of colloidal particles predominate and control their behavior
d. The surface area of colloidal particles is very small compared to their mass - ✔✔
Questions with Answers
The two most important factors impacting the effectiveness of chlorination are
a. pH of the water and the content of foreign substances in the water
b. concentration of chlorine and the content of foreign substances in the water
c. concentration of chlorine and contact time
d. pH and temperature of the wastewater - ✔✔
The treatment process that controls corrosion or scaling is known as
a. chemical control
b. stabilization
c. passivation
d. corrosion kinetics - ✔✔
Permanganate reactions are highly
dependent upon
a. organic in the water
b. pH
c. temperature
d. alkalinity - ✔✔
It is hard to kill the organism that causes which one of the following illnesses?
a. Cholera
b. Typhoid
c. Cryptosporidiosis
, d. Infectious hepatitis - ✔✔
Disinfection go water wells with free chlorine requires exposure for _____ at a concentration of
______.
a. 6 to 12 hours; 25 mg/L
b. 12 to 24 hours; 25 mg/L
c. 12 to 24 hours; 50 mg/L
d. 24 to 28 hours; 100 mg/L - ✔✔
Detention time in flocculation basins are usually designed to provide for
a. 5 to 15 minutes.
b. 15 to 45 minutes.
c. 45 to 60 minutes.
d. 60 to 90 minutes. - ✔✔
Alum works best in a pH range of
a. less than 4.0.
b. 4.0 to 5.5.
c. 5.8 to 7.5.
d. Greater than 9.0. - ✔✔
Which statement is true concerning colloidal particles?
a. Colloidal particles are so small that gravity has little effect on them
b. The zeta potential between colloidal particles is balanced by covalent bonding
c. Electrical phenomenon of colloidal particles predominate and control their behavior
d. The surface area of colloidal particles is very small compared to their mass - ✔✔
