CWEA ENVIRONMENTAL COMPLIANCE INSPECTOR GRADE 1
TEST QUESTIONS WITH ACCURATE SOLUTIONS
1) Name three waterborne diseases -- Answer ✔✔ Typhoid fever, dysentery, cholera
2) When organic waste our discharged to receiving water, oxygen is depleted by... --
Answer ✔✔ Bacteria
3) Sludge wasting from secondary clarifiers are normally required in order to control...
-- Answer ✔✔ Aerator mixed liquor solids
4) An application for renewal of an NPDES permit must be submitted __________
days before the previous permit expires -- Answer ✔✔ 180
5) From a public health standpoint, which of the following is the safest sludge for soil
conditioning purposes -- Answer ✔✔ Heat dried sludge
6) The major purpose of an inlet baffle in a settling tank is to -- Answer ✔✔ Reduce
velocity and disperse flow
,7) What is the primary purpose of forced draft ventilation in lift stations? -- Answer
✔✔ Remove dangerous gases
8) High-rate, anaerobic digestion refers to the fact that the organic waste material is
applied to an anaerobic reactor at high ___________ loading rates -- Answer ✔✔
Volumetric
9) As a digester approaches "sour" conditions:
a) Alkalinity of solids decreases.
b) Concentration of volatile acids increases.
c) Amount of methane production decreases.
d) All of the above. -- Answer ✔✔ All of the above
10) The concentration of volatile, solid in the feed sludge to a digester is an indirect
measure of what? -- Answer ✔✔ "Food" available for bacteria in the digester
11) What is the typical detention time in a mesophilic digester? -- Answer ✔✔ 28 days
12) The presence of white pillowing foam on an aeration tank indicates... -- Answer ✔✔
The aeration tank is underloaded organically
13) What purpose do the chemicals that are added to the distilled water for the BOD
test serve? -- Answer ✔✔ They adjust the pH within the desirable range and provide
essential elements for the growth of the biological life actually exerting the oxygen
demand
, 14) An operator runs a Winkler by the azide modification of the Winkler method. He
runs out of standard sodium thiosulfate. Which reagent can be used instead? --
Answer ✔✔ Phenylarsenine oxide
15) A identifies what part? -- Answer ✔✔ Media
16) F identifies what part? -- Answer ✔✔ Filter tank
17) E identifies what part? -- Answer ✔✔ Wash trough
18) What is the best way to control excess of foaming during start up of a digester? --
Answer ✔✔ Stir gently to release excess gas
19) What is the principal function of the zoogleal mass on the trickling filter? -- Answer
✔✔ Reduce the organic content
20) Which of the following can cause foaming in the anaerobic digesters?
a) Nocardia
b) Fluctuating temperature.
c) Inadequate mixing.
d) All of the above. -- Answer ✔✔ All of the above
21) What type of characteristics describe a good quality of activated sludge? -- Answer
✔✔ Good settling characteristics, some dissolved oxygen present, and brown in
color
TEST QUESTIONS WITH ACCURATE SOLUTIONS
1) Name three waterborne diseases -- Answer ✔✔ Typhoid fever, dysentery, cholera
2) When organic waste our discharged to receiving water, oxygen is depleted by... --
Answer ✔✔ Bacteria
3) Sludge wasting from secondary clarifiers are normally required in order to control...
-- Answer ✔✔ Aerator mixed liquor solids
4) An application for renewal of an NPDES permit must be submitted __________
days before the previous permit expires -- Answer ✔✔ 180
5) From a public health standpoint, which of the following is the safest sludge for soil
conditioning purposes -- Answer ✔✔ Heat dried sludge
6) The major purpose of an inlet baffle in a settling tank is to -- Answer ✔✔ Reduce
velocity and disperse flow
,7) What is the primary purpose of forced draft ventilation in lift stations? -- Answer
✔✔ Remove dangerous gases
8) High-rate, anaerobic digestion refers to the fact that the organic waste material is
applied to an anaerobic reactor at high ___________ loading rates -- Answer ✔✔
Volumetric
9) As a digester approaches "sour" conditions:
a) Alkalinity of solids decreases.
b) Concentration of volatile acids increases.
c) Amount of methane production decreases.
d) All of the above. -- Answer ✔✔ All of the above
10) The concentration of volatile, solid in the feed sludge to a digester is an indirect
measure of what? -- Answer ✔✔ "Food" available for bacteria in the digester
11) What is the typical detention time in a mesophilic digester? -- Answer ✔✔ 28 days
12) The presence of white pillowing foam on an aeration tank indicates... -- Answer ✔✔
The aeration tank is underloaded organically
13) What purpose do the chemicals that are added to the distilled water for the BOD
test serve? -- Answer ✔✔ They adjust the pH within the desirable range and provide
essential elements for the growth of the biological life actually exerting the oxygen
demand
, 14) An operator runs a Winkler by the azide modification of the Winkler method. He
runs out of standard sodium thiosulfate. Which reagent can be used instead? --
Answer ✔✔ Phenylarsenine oxide
15) A identifies what part? -- Answer ✔✔ Media
16) F identifies what part? -- Answer ✔✔ Filter tank
17) E identifies what part? -- Answer ✔✔ Wash trough
18) What is the best way to control excess of foaming during start up of a digester? --
Answer ✔✔ Stir gently to release excess gas
19) What is the principal function of the zoogleal mass on the trickling filter? -- Answer
✔✔ Reduce the organic content
20) Which of the following can cause foaming in the anaerobic digesters?
a) Nocardia
b) Fluctuating temperature.
c) Inadequate mixing.
d) All of the above. -- Answer ✔✔ All of the above
21) What type of characteristics describe a good quality of activated sludge? -- Answer
✔✔ Good settling characteristics, some dissolved oxygen present, and brown in
color
