Large-scale industries like manufacturing and mining produce millions of gallons of wastewater every day. This wastewater can be reused or returned to the environment after going through a wastewater treatment plant. The average time it takes to successfully treat water once it enters the plant is heavily influenced by the technology available. While treatment can take less than a day in some plants, it can take up to 36 hours in others. But if a plant is equipped with the latest process automation technology, wastewater treatment takes less time.