Quiz 14: Solid and Hazardous Waste
The photovoltaic cell: In general the photovoltaic cell is a convertor, which converts solar energy into electric energy. The photovoltaic cells are those devices that lock-up the solar energy and converted it directly into electric current. The photovoltaic cells work by capturing the electrons form the solar energy and transport the captured electrons by one-way electrostatic barrier formed in between the two different types of semiconducting materials.
Organic waste is decomposed in a slurry that keeps organic waste free of air anaerobic. Anaerobic bacteria digest the organic waste into methane, CH 4 , and solids that can be used as compost. In this way a great variety of household waste, agricultural waste, and food-processing waste can be turned into useful and marketable products.
Most of the liquid oil in the world is located in the Greater Middle East countries like Saudi Arabia, Iraq, UAE, Kuwait etc. About half of the world's liquid oil, the original 600 billion metric tons of liquid oil is to be finally recoverable. Among the 300 billion recoverable barrels, roughly 189 billion bbl are in proven reserves. We have already used more than 75 billion bbl, which is almost half of proven reserves. The remainder is expected to last for next 41 years, basing on the present consumption rates of 30.7 billion bbl per year.