What is the byproduct left behind after the reverse osmosis process, which contains high concentrations of dissolved solids?

The byproduct left behind after the reverse osmosis process that contains high concentrations of dissolved solids is referred to as reject. During reverse osmosis, water is pushed through a semi-permeable membrane, which allows the passage of water molecules while rejecting larger molecules and dissolved solids, such as salts and other contaminants. The water that successfully passes through the membrane is called permeate, while the concentrated solution that remains on the feed side of the membrane contains the impurities and is known as reject.

This reject stream is significant because it requires proper handling and disposal due to its high concentration of dissolved solids, which can include harmful contaminants if the water being treated is particularly polluted. Understanding the composition and management of the reject stream is crucial for effective wastewater treatment and environmental protection.