A river with an inflow of domestic sewage rich in organic waste may result in

A river with an inflow of domestic sewage rich in organic waste may result in the death of fish due to a lack of oxygen.Following the discharge of sewage into a river, micro-organisms involved in the biodegradation of organic matter in the receiving water body consume a lot of oxygen, and as a result, there is a sharp decline in dissolved oxygen downstream from the point of sewage discharge. This causes the mortality of fish and other aquatic creatures.