Ключевые слова: aerial view, biological treatment, circle, circular, clean, dirty, ecology, effluent, environment, environmental, facility, factory, filtration, industry, plant, pollution, process, purification, purified, purity, recirculation water, recycle, recycled, recycling, sanitary, sedimentation, sedimentation tank, separation, sewage, sewage treatment, sewer, sewerage, station, system, tank, technology, treatment, treatment plant, waste, wastewater, wastewater treatment, water, water aeration, water cleaning,