In tertiary treatment, techniques such as filtration, disinfection, carbon absorption and other processes are used to remove the remaining organic load, suspended or dissolved solids, pathogens and heavy metals that pass through other treatment processes.
Also called effluent polishing, tertiary treatment raises the effluent quality to the level suitable to its intended use, whether for discharge into lakes, rivers, oceans, reuse as non-crop irrigation (parks, golf courses, greenways, etc.), groundwater recharge or in certain cases, as influent to drinking water plants.
Wastewater plant effluent must be monitored to ensure compliance with effluent permit limits, which vary based on jurisdiction and country.
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