a) Explain important parameters which are required to be known for proper treatment of sewage. 

Proper treatment of sewage is essential to maintain environmental health and prevent the spread of waterborne diseases. There are several parameters that must be considered for the effective treatment of sewage. These include:

1. Flow rate: The flow rate of the sewage is the volume of sewage that is generated per unit time. It is important to determine the flow rate to ensure that the treatment plant is designed to handle the maximum amount of sewage that can be generated.

2. BOD (Biochemical Oxygen Demand): BOD is a measure of the amount of _______ __________ _____ _____ _________ ___ _____ _______ __________.
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