- Waste Water Engineering - Section 1
- Waste Water Engineering - Section 2
- Waste Water Engineering - Section 3
- Waste Water Engineering - Section 4
- Waste Water Engineering - Section 5
- Waste Water Engineering - Section 6
- Waste Water Engineering - Section 7


Waste Water Engineering - Engineering
Q1: For the COD test of sewage, organic matter is oxidised by K2Cr207 in the presence ofA
H2SO4
B
HNO3
C
HCl
D
none of these.
ANS:A - H2SO4 In the Chemical Oxygen Demand (COD) test for sewage, organic matter is oxidized to measure the amount of oxygen required for this process. The oxidation is carried out using a strong oxidizing agent, usually potassium dichromate (K2Cr2O7), in the presence of sulfuric acid (H2SO4). Briefly, the steps of the COD test involve:
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