engineering recuitment WBPSC JE Civil Mock Test 2022 Environmental Engineering Quality and Characteristics of Sewage
Order 4 solutions in decreasing order of their BOD values?
1
Industrial water > river water > tap water > bottled water
2
Tap water > bottled water > river water > industrial water
3
Bottled water > tap water > river water > industrial water
4
River water > industrial water > tap water > bottled water