engineering recuitment Bihar LRC AMIN JE Civil Mock Test 2023 Environmental Engineering Quality and Characteristics of Sewage
A municipal sewage of 5 ml is added in distilled water to make 300 ml of sample. The initial DO of the sample was 8 mg / L, after 5 days of incubation the DO of the sample was 3 mg / L. The BOD of the sample is
1
30 mg / L
2
3000 mg / L
3
3 mg / L
4
300 mg / L