Sewage treatment (or domestic wastewater treatment, municipal wastewater treatment) is a type of wastewater treatment which aims to remove contaminants from sewage to produce an effluent that is suitable to discharge to the surrounding environment or an intended reuse application, thereby preventing water pollution from raw sewage discharges.
Winter landscapes have a truly dreamlike allure. Fresh snow leaves the landscape untouched and pristine.
The sun creates a sparkle over the blanketed land. Mist rises from running water and trees shine in the sunlight.
From the extraction of the cement marl in the quarries to the cement factories that produce cement (the most used material in the world, second only to water) to the recycling of demolition waste used as aggregates instead of being buried in landfills,
In Hong Kong the lack of space caused demand for denser constructions, which developed the city to a centre for modern architecture and the world's most vertical city. The city also has the largest number of skyscrapers of any city in the world.
New high speed trains and old steam locomotives , vintage carriages, and new ways of keeping alive abandoned railroad tracks such as the "velorail" ( bikes on rails) in France.
China's economy has been one of the world's fastest-growing countries with annual growth rates consistently above 6 percent. How this huge country is changing through video footage shot in different regions.