primary sedimentation basin sewage flowing through large tanks |
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| navigate by keyword : black bulgaria cleaner conservation ecology ecosystem effluent environment environmental european factory filter filtration fittings flow for garbage industrial industry pipe plant program purification purity recycling removal reservoir sanitary sanitation sedimentation separator sewage sludge small storage system tank town treatment turbidity union utility village waste wastewater water |
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| Sewage treatment plant. Primary sedimentation basin, sewage flowing through large tanks |
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