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Consider the following statements with reference to the mixing of industrial waste water with domestic waste water: 1. The industrial waste water can be mixed with domestic water when it has higher BOD. 2. The industrial waste water can be mixed with domestic water when the pH value of industrial waste water is highly alkaline. Which of the above statements is/are correct?

Consider the following statements with reference to the mixing of industrial waste water with domestic waste water: 1. The industrial waste water can be mixed with domestic water when it has higher BOD. 2. The industrial waste water can be mixed with domestic water when the pH value of industrial waste water is highly alkaline. Which of the above statements is/are correct? Correct Answer Neither 1 nor 2

As per IS 3306-1974, Industrial waste water can discharged into sewer line, only if it satisfies teh following tolerance limits.

Characteristics

Tolerance Limit

BOD ( 5 days)

500 mg/l

pH Value

5.5 - 9

TSS

600 mg/l

Temperature

450 C

Oil and grease

100 mg/l

 

Based on above table, , Industrial waste water can discharged into sewers if BOD is less than 500 mg/l and pH ranges from 5.5 to 9. In general, higher alkalinity means pH > 10 and higher BOD means that industrial waste is highly polluted and we cannot discharge of mix with sewer lines.

Hence, both statements are false.

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