Question

Biochemical oxygen demand of treated water should be

Answer 1

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Moderately polluted rivers may have a BOD value in the range of 2 to 8 mg/L. Rivers may be considered severely polluted when BOD values exceed 8 mg/L. Municipal sewage that is efficiently treated by a three-stage process would have a value of about 20 mg/L or less.

Answer 2

Answer:

• Moderately polluted rivers may have a BOD value in the range of 2 to 8 mg/L
• Rivers may be considered severely polluted when BOD values exceed 8 mg/L
• Municipal sewage that is efficiently treated by a three stage process would have a value of about 20mg/ L