Firstly, plastic is not biodegradable. As compared to organic waste, it takes hundreds of years to decompose. But, if the quantity of swallowed plastic is small, then it will not be a problem. Our body pushes out the materials which it cannot digest. Problems might occur if the quantity of swallowed plastic is large. Our body will not be able to push it out. It will stay in our gut and might partially prevent further food digestion. In extreme cases, this may also prove to be fatal.
Also, many plastics are chemical-laden. These chemicals are commonly known as phthalates. They are used to make plastics more flexible, transparent, hard to break as well as to increase their longevity. Phthalates are extremely harmful to our body. They can damage our liver, kidneys, lungs and reproductive system.
Single generator sets of over 600 MW are now used in the UK, though there are many smaller generators in use. A 600 MW generator can supplythe average needs of over 1 million UK households. Three or four such generators are typically installed in a single large coal-fired station which isoften sited close to a coal mine, away from the city dwellers who consume the electricity. Such generators are usually driven by a compound arrangement of highpressure, intermediate-pressure and low-pressure turbines, increasing in size as the pressure decreases. Modern turbines rotate in a speed range from 1500 to 3500 r.p.m., usually 3000 r.p.m. for the UK’s 50 Hz system. For large coal-fired plant the steam pressure could be 25 megapascals (MPa) with steam temperatures of 500–600 °C to improve the thermodynamic efficiency. In nuclear reactors, which operate under less demanding conditions, the steam is superheated to about 5 MPa and 300 °C. Modern water tube boilers are complex and have ...
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