Ключевые слова: biological, circle, circular, clean, conservation, dirty, disinfection process, ecology, ecosystem, effluent, environment, environmental, facility, filtration, industrial, industrial sewage treatment, industry, plant, pollution, purification, purified, purity, recycle, recycled, recycling, reservoir, round, sedimentation, separation, sewage, sewage treatment, sewer, sewerage, station, tank, technology, treatment, treatment facilities, waste, wastewater, wastewater pools, water, water recycling,