Solution: (4) The dissolved oxygen (DO) in a river with an input of home sewage rich in organic waste will be reduced, potentially resulting in fish death due to a lack of oxygen.
178. A river with an inflow of domestic sewage rich in organic waste may result in: (1) Drying of the river very soon due to algal bloom. (2) Increased population of aquatic food web organisms. (3) An increased production of fish due to biodegradable nutrients. (4) Death of fish due to lack of oxygen.
178. A river with an inflow of domestic sewage rich in organic waste may result in: (1) Drying of the river very soon due to algal bloom. (2) Increased population of aquatic food web organisms. (3) An increased production of fish due to biodegradable nutrients. (4) Death of fish due to lack of oxygen.