The greater BOD of waste water is the indication of

The Biological Oxygen Demand (BOD) is a measure of the amount of dissolved oxygen consumed by microorganisms while decomposing organic matter in water. When there is a higher concentration of organic pollutants in wastewater, it results in a higher BOD value. This indicates that there is a larger quantity of organic material that needs to be broken down by microorganisms, leading to higher oxygen consumption.