1|Page
WASTE WATER GRADE 1 NEWEST 2025 ACTUAL
EXAM COMPLETE 100 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+||BRAND
NEW!!
What is measured when sampling BOD? - CORRECT
ANSWER-The depletion of dissolved oxygen (DO) in a sample
over 5 days at 20 C is measured.
What are the three thing you must to know about BOD? -
CORRECT ANSWER-1. Direct measure of the amount of
dissolved oxygen consumed by aerobic bacteria over 5 days.
2. Indirect measure of the organic strength pf wastewater.
3. Assesses the performance of wastewater treatment plants, unit
operations, unit processes in wastewater.
What is measured when sampling COD? - CORRECT
ANSWER-The chemical oxidation of all organic in three sample
,2|Page
I hate are the 4 things you must know about COD ? -
CORRECT ANSWER-1. Another measure of organic strength
2. COD is always greater than BOD
3. In raw municipal sewage COD is typically 2-4 times greater
than BOD
4. Approximately 2 hours to run the COD test compared to 5
days of BOD
What does pH = ? - CORRECT ANSWER-pH=log((1/H+))
In words pH equals the log of the reciprocal of the hydrogen ion
concentration
What is the pH range scale ? - CORRECT ANSWER-0-14
pH below 7 means that what ? - CORRECT ANSWER-Acidic
Conditions
pH over 7 means what ? - CORRECT ANSWER-Basic or
alkaline conditions
, 3|Page
What pH grade does life prefer in waste water ? - CORRECT
ANSWER-pH 7
How is pH measured ? - CORRECT ANSWER-pH is measure
with with standard electrode that is typically calibrated using pH
buffers
When finding concentration of TS by evaporating water at 103-
105 C the residual remains. Remains are put through filter and
separate TS and FS. After you put TS in 550 C sperates TS into
FS and VS. the FS remain while VS burn away. Between FD
and VS which is organic and which is inorganic ? - CORRECT
ANSWER-FS = inorganic
VS = organic
When finding TSS by evaporating water at 103-105 C the
residual remains. Remains are put through filter. After you put
TSS residual in 550 C sperates FSS and VSS. the FS remain
while VS burn away. Between FSS and VSS which is organic
and which is inorganic ? - CORRECT ANSWER-FSS =
inorganic
VSS = organic
WASTE WATER GRADE 1 NEWEST 2025 ACTUAL
EXAM COMPLETE 100 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+||BRAND
NEW!!
What is measured when sampling BOD? - CORRECT
ANSWER-The depletion of dissolved oxygen (DO) in a sample
over 5 days at 20 C is measured.
What are the three thing you must to know about BOD? -
CORRECT ANSWER-1. Direct measure of the amount of
dissolved oxygen consumed by aerobic bacteria over 5 days.
2. Indirect measure of the organic strength pf wastewater.
3. Assesses the performance of wastewater treatment plants, unit
operations, unit processes in wastewater.
What is measured when sampling COD? - CORRECT
ANSWER-The chemical oxidation of all organic in three sample
,2|Page
I hate are the 4 things you must know about COD ? -
CORRECT ANSWER-1. Another measure of organic strength
2. COD is always greater than BOD
3. In raw municipal sewage COD is typically 2-4 times greater
than BOD
4. Approximately 2 hours to run the COD test compared to 5
days of BOD
What does pH = ? - CORRECT ANSWER-pH=log((1/H+))
In words pH equals the log of the reciprocal of the hydrogen ion
concentration
What is the pH range scale ? - CORRECT ANSWER-0-14
pH below 7 means that what ? - CORRECT ANSWER-Acidic
Conditions
pH over 7 means what ? - CORRECT ANSWER-Basic or
alkaline conditions
, 3|Page
What pH grade does life prefer in waste water ? - CORRECT
ANSWER-pH 7
How is pH measured ? - CORRECT ANSWER-pH is measure
with with standard electrode that is typically calibrated using pH
buffers
When finding concentration of TS by evaporating water at 103-
105 C the residual remains. Remains are put through filter and
separate TS and FS. After you put TS in 550 C sperates TS into
FS and VS. the FS remain while VS burn away. Between FD
and VS which is organic and which is inorganic ? - CORRECT
ANSWER-FS = inorganic
VS = organic
When finding TSS by evaporating water at 103-105 C the
residual remains. Remains are put through filter. After you put
TSS residual in 550 C sperates FSS and VSS. the FS remain
while VS burn away. Between FSS and VSS which is organic
and which is inorganic ? - CORRECT ANSWER-FSS =
inorganic
VSS = organic
