Green Tech Particulate Matter 8.docx

Particulate matter There is something strange that we can feel on the air when we passing on the street sometimes. It is not harmful yet, but do you know that it is a kind of pollution that we know before. The gas emission from car and busses is nearly clear but we still feel different thing when we breath through it. Particulate matter of pollution nowadays is cannot be seen but the effect is close to harmful. the particle pollution includes of PM10 that are inhalable particles, with diameters that are generally 10 micrometers and smaller, and the PM 2.5 that very fine particles, with diameters that are generally 2.5 micrometers and smaller, the size of single hair is 70 micrometers in average, so the 2.5 micrometer is 30 times smaller than the largest fine particle. These particles come in many size and shape, and can be made up of hundreds of different chemicals. Some are emitted directly from a source, such as construction sites, unpaved roads, fields, smokestacks or fire. Most particles form in the atmosphere as a result of complex reaction of chemicals such as sulfur dioxide and nitrogen oxides, which are pollutants emitted from power plants, industries and automobiles. Even the particulate matter contains microscopic solids or liquid droplets that are so small that they can be inhaled and cause serious health problems. Some particles less than 10 micrometers in diameter can deep into your lungs and some may even get into your bloodstream. Of these, particles less than 2.5 micrometers in diameter, also known as fine particles less than 2.5 micrometers in diameter, also known as fine particle are also the main cause of reduced visibility in parts of the united states, including many of our treasured national parks and wilderness areas. The National Ambient Air Quality Standards (NAAQS) for PM pollution specify a maximum amount of PM to be present in outdoor air. There are different standards for PM10 and PM2.5. Limiting PM pollution in the air protects human health and the environment. The clean air act requires EPA to set national air quality standards for particulate matter, as one of the six criteria pollutants that is ground level ozone, particulate matter, Carbon Monoxide, lead, sulfur dioxide and Nitrogen dioxide. To clean the air we can use a filter to clean, the usual things that we use is mask filter, for industrial gas emission, we cannot use filter that usually do. Because it will be need double of the energy to pass through the filter, and it will be needed to change in every hour. So, to filter the particulate matter o industry we can use

ESP or Electrostatic precipitator that use static electricity to remove soot and ash from exhaust fumes before they exit the smokestacks. This one common air pollution control device. Most power stations burn fossils fuels such as coal or oil to generate electricity for use. When these fuels undergo combustion, smoke is produced. Smoke consists of tiny particle of soot that are suspended in hot rising air. These unburned particles of carbon are pulled out of the smoke by using static electricity in the precipitators, leaving clean, hot air to escape the smokestacks. It is vital to remove this unreacted carbon from the smoke, as it can damage buildings and harm human health.