Ключевые слова: clean, conservation, construction, dirty, ecology, engineering, environment, environmental, facility, factory, flow, gas, industrial, industry, israel, jerusalem, methane, plant, pollution, purification, purified, purity, recycle, recycled, recycling, removal, sanitary, sanitation, sedimentation, sewage, sewer, sludge, sorek, storage, system, tank, technology, treatment, utility, valley, view, waste, wastewater, water,