![](http://www.alamy.com/thumbs/6/A1F8A069-BA61-4D00-9326-C41209ABAA4C/BA197G.jpg)
Activated sludge secondary sewage treatment system.
Secondary treatment involves the removal of organic material by bacterial decomposition This is an activated sludge secondary treatment system at a sewage treatment plant in West Caldwell NJ
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Photo credit: © Martin Shields / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: activated, aeration, aerobic, decomposition, facility, integrated, management, plant, process, secondary, sewage, sludge, tank, treatment, waste, wastewater, water, works