TREATMENT OF POLLUTANTS
There are various levels of treatment that prevent dumping raw waste products from being dumped into surface waters. Industrial wastes may require special treatment to remove harmful chemicals before reentering the water system.
For the more common problem of organic wastes, the three main treatment methods for treating waste water are
septic systems, lagoons, and sewage treatment plants.
Each method must be properly sized so that the treatment system is able to handle the volume of waste entering it.
Septic systems are designed for individual households,
lagoons may meet the needs of small towns, and
sewage treatment facilities are necessary for controlling pollution.