Ключевые слова: aerial, basin, biological, blackwater, buildings, chemical, chemically, circle, clean, cleaning, contaminants, conversion, ecological, ecology, ecosystem, effluent, engineering, environment, environmental, factory, filtering, greywater, groundwater, industrial, industry, liquid, plant, process, re use, recycle, recycled, round, separate, settle, sewage, sewer, sewerage, sludge, station, systems, tanks, technology, top view, treated, treatment, waste, wastewater, water, water treatment, water treatment plant,