plastered white fence with black lattice the flower bed bordered |
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| navigate by keyword : aeration antibiotic antibiotics architecture bacterial bacterium biological brown building circulation cleaning concrete contraception development ecology ecosystem education engineering feces fish hormones industrial industry landscape modern muddy outdoor oval pattern pills pool process processing purification purified purity railing recycling reproduction sewage treatment plant sludge smelling tank unpleasant urban video waste water |
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| Biological purification takes place in a biological reactor.pollution from wastewater is removed using microorganisms called activated sludge. large-capacity tanks with aeration, nozzles, sprinkler |
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