Ключевые слова: aerial view, background, chemical, circle, circular, clean, cleaning, conservation, dirty, drink, ecology, ecosystem, effluent, engineering, environment, environmental, environmental conservation, equipment, facility, factory, filter, filtration, flow, garbage, horizontal, industrial, industry, liquid, modern, pipe, plant, pollution, process, purification, purity, recycling, sewage, sewage treatment plant, sewer, sewerage, storage, sustainability, sustainable, system, tank, technology, treatment, waste, wastewater, water,