Ключевые слова: aerial, area, away, biology, canada, circle, circular, city, cleaning, construction, dirty, drone, ecology, effluent, environment, environmental, facility, factory, filtration, flow, foreground, grassy, industrial, large, others, pattern, plant, pollution, process, purification, purified, purity, recycling, saskatchewan, saskatoon, series, sewage, sewer, sewerage, sludge, storage, system, tanks, technology, treatment, urban, view, waste, wastewater, water,