bubbles the surface water |
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| navigate by keyword : air bacteria basin biological blackwater bubbles canal channel clean concept container contaminated contamination dirty drain drainage ecology engineering environment filtration ground health industrial industry liquid modern piping plant plumbing pool process processing pure recycle remove sanitary sewer sludge source station structure system technology treat treatment tube urban used waste water |
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| Bubbles on the surface of water that are polluted by draining waste water into natural water sources.Environmental problems that often occur in large cities or in developing countries |
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