city water purification wastewater flows through large circular tanks with power driven scrapers view from above |
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| navigate by keyword : aerial circle circular clean conservation construction dirty ecology ecosystem effluent environment environmental facility factory filter filtration industrial industry liquid plant pollution process purification purified purity recirculation recycle recycled recycling round sedimentation separation separator settle sewage sewer sewerage sludge station storage system tank technology treatment turbidity urban view waste wastewater water |
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| City water purification Wastewater flows through large circular tanks with power-driven scrapers. View from above |
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