Ключевые слова: above, access, aerial, aerial view, algae, building, circle, circular, copy space, directly above, dirty, drinking water, environment, environmental, factory, filter, filtration, industrial, industry, management, outdoors, plant, process, purification, purify, purifying, removal, road, sewage, silo, site, slime, sludge, slurry, storage, structure, tank, toxic, toxins, treatment, uk, waste, wastewater, water, water treatment, waterworks, works,