With the United States growing and cities becoming larger and larger day by day, communities have been battling water shortages all throughout the country. For the past fifty or so years reclaimed water has been used all over the world. Within the course of this case paper I will attempt to compare and contrast the secondary water treatment methods to that of the tertiary water treatment methods.
Wastewater treatment is classified as primary, secondary, and tertiary treatment; this is the process of how wastewater actually becomes recycled water. The primary treatment process is the initial stage or in other words the beginning of how organic and inorganic solids are removed via sedimentation and flotation. During this initial stage approximately 40-60% of suspended solids and raw sewage are collected in sedimentation tanks and 25-35% of the biochemical oxygen demand (BOD) is removed from the waste stream.
During the secondary treatment the out flowing from the primary treatment process contains residual organic and inorganic material. Secondary treatment systems will remove between 80-95% of suspended solids and (BOD) through two methods known as attached growth and suspended growth.
Finally we are at the tertiary treatment process also known as the polishing process where treated water is filtered through fine sand or other granular material to remove solids. After the filtering process is completed water is then chlorinated for disinfection and we then have what we call reclaimed water.
Reclaimed water is nothing more than wastewater that has gone through the waste water processes and is now used for beneficial purposes. This water is currently used for...