Substances of (dead) plant or animal matter, with a carbon-hydrogen structure.

Water molecules passing through membranes naturally, to the side with the highest concentration of dissolved impurities.

The place where a wastewater treatment plant discharges treated water into the environment.

One of the guidelines for design of the settling tanks and clarifiers in a treatment plant to determine if tanks and clarifiers are used enough.

A chemical reaction in which ions are transferring electrons, to increase positive valence.

A man-made body of water in which waste is consumed by bacteria.

The electric potential required to transfer electrons from the oxidant to the reductant, used as a qualitative measure of the state of oxidation in water treatment systems.

The reduction of the dissolved oxygen level in a water body.

An unstable oxidizing agent, that consists of three oxygen atoms and can be found in the ozone layer in the atmosphere. It is produced by electrical discharge through oxygen or by specifically designed UV-lamps.

A device that generates ozone by passing a voltage through a chamber that contains oxygen. It is often used as a disinfection system.