Tertiary treatment is usually the final step in the process of cleaning wastewate before releasing it back into the environment. The steps include preliminary, primary, secondary, and tertiary treatment, and sometime even a sewage treatment process to conclude the process. During tertiary treatment the contaminants that the prior steps could not be cleaned are removed. These tactics may include stabilizing oxygen and the removal of unwanted chemicals like nitrogen and phosphorus. This can be done with carbon absorption, ion exchange, and dechlorination, amongst other treatments.
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