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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.
- Indirect measure of the organic strength pf wastewater.
- 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
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I hate are the 4 things you must know about COD ? - CORRECT ANSWER -1. Another measure of organic strength
- COD is always greater than BOD
- In raw municipal sewage COD is typically 2-4 times greater
- Approximately 2 hours to run the COD test compared to 5
than BOD
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
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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
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