engineering recuitment TNPSC AE Civil 2024 Test series Environmental Engineering Quality and Characteristics of Sewage
The COD/BOD5 ratio of two wastewater samples form different sources was measured as 1.5 and 3.0 respectively. Based on this information the following conclusion may be arrived at.
1
The sample with higher COD/BOD5 ratio has more organic matter
2
The sample with lower COD/BOD5 ratio has higher percentage of biodegradable organic matter
3
The sample with lower COD/BOD5 ratio is from an industrial source
4
The sample with higher COD/BOD5 ratio is from an domestic sewage