Treating sewage so that it does not cause harm to the environment is another use of water treatment.

One estimate was that $5 billion was spent to upgrade plants to treat sewage.

The bioreactors could also be used to treat sewage and thus arrest flow of organic matter into the lake.

Asbury Park opened a new treatment plant, but not in time to prevent the release of improperly treated sewage.

This is used in artificial constructed wetlands, for treating sewage.

It's probably treated sewage brought in by the sea.

The fifth report dealt with the merits of different ways of treating domestic sewage.

It also aims to relieve many costs the law imposes on state and local governments, which play the main role in treating sewage.

Different studies were carried out in this plant treating sewage at an Italian wastewater treatment plant.

It also means the potential for contamination of ground water and surface areas from improperly treated sewage will be eliminated.