Before revision: The biological oxygen demand (BOD) and dissolved oxygen (DO) curves in a river reaching equilibrium over 175 seconds after a continuous input of high BOD influent is added into the river at y = 15 m .
After revision: The biological oxxand t = 0sgen demand (BOD) and dissolved oxygen (DO) curves in a river reaching equilibrium over 175 seconds after a continuous input of high BOD influent is added into the river at y = 15 m .