Posts Tagged ‘Natural Resources’

Renewable Energy Resources versus Fossil Fuels

Sunday, September 27th, 2009
In modern western world the demand for energy has increased dramatically in the past century and it will grow even further and harder in the near future than ever before. The need for energy rises with upcoming markets that also need more energy. Energy is needed for cars, buses, and other means of transportation, but also to run our appliances and provides us light. Energy is also important for our safety. At night or in the dark a lot can be stolen without proper lightning. Energy is therefore needed for our development and safety.

The way we use energy today comes from knowledge that has it’s foundations in the past century and before. Great men like Newton and Philips have set the path for us today to make proper use of energy. The sources which we use for our energy demand are known as non-renewable energy resources. These sources will be discussed here in the article.

Definition of Non-Renewable Energy Resources

The name really explains it very well. Non-renewable energy resources are natural resources that cannot be recycled or re-grown. These natural resources are fossil fuels like coal, petroleum, and natural gas. It also includes mined resources such as the elements used in the production of electricity (uranium and plutonium, for instance). These resources replenish itself in a quicker rate.

Fossil fuels are very versatile. One of their functions is to generate electricity. In order to generate electricity, fossil fuels are burned through the process of combustion. The energy produced from the combustion process is used to power a turbine. The turbine is responsible for the conversion of energy produced from combusted fossil fuels into electricity.

Coal

Coal is one the most used fossil fuels. It is consider too be the most important energy source to produce electricity. The U.S. produces 50% of its energy supply through the combustion of coal. The coal itself is a brownish-black sedimentary rock which contains carbon and other assorted elements. It is extracted from the ground through underground mining or open-pit mining.

Natural Gas

Natural gas is also used to produce electricity. The electricity is produced through steam turbines and gas turbines. Because the gas contains methane the combustion emits less harmful gasses that have a negative effect on global warming. Thus natural gasses are better for the environment compared to petroleum and coal.

There is also another use for it and that is as fuel for cars. It is much cheaper that gasoline and produces less harmful gasses. The disadvantage of running your car on natural gas is that you need more fuel compared to gasoline and the car needs more maintenance. In countries like Argentina, Brazil, Pakistan, Italy, The Netherlands and India it is used as a fuel for cars.

Crude oil

This fuel is the most talk about for the past year(s). The prices for crude oil have gone through the roof and will be rising even more. The demand is increasing while there is less crude oil available. The term black gold is now more applicable than ever before.

The oil itself is very think in consistency and has a dark brown or greenish colour characteristic. It is a complex mixture of different hydrocarbons.

Crude oil or petroleum has various uses. It can be used as fuel or cars and different industrial machines. It is also used as a raw material for products like plastics, solvents, fertilizers and pesticides.

Although the need for crude oil is high and the demand is rising the available crude oil is decreasing. That leaves us no other option than to look for alternatives.

Non-renewable energy plays a very important role in our daily lives. Non-renewable energy will be needed today and in the future. Because this energy source cannot be recycled or re-grown the reserves are limited. The consequences of the shortages of fossil fuels are experienced today and tomorrow. We will need to use these fossil fuels wisely and will need to shift our focus to other renewable energy source. These are the sources that we need to focus on today and years to come.

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Waste Management for a Modern World

Tuesday, September 22nd, 2009
Waste Management refers to the process of (i) collection of waste matter generated mainly by human consumption and activity, (ii) transport and shipment of the collected waste matter to a waste treatment facility and (iii) processing/recycling this waste material for further use or disposing it for good.

Waste Management is required for three reasons. One, you can’t be having waste lying around in any area as it will make the area look awful and the waste will raise a stink. Two, if waste is unattended to, it will attract pests and termites and the chances of a disease spreading will increase. Three, Man has realized that, if he allows waste to pile up or even burned, such an act would be disastrous for our environment. It is a mans duty to control waste and recycle it back into use by recovering resources from it.

History Of Waste Management

Once upon a time, when the density of population was low, the exploitation of the world’s natural resources was minimal and manageable. Plus, there was not much of industrialization and the wastes generated by humans were mostly biodegradable and thus their impact on the environment, minimal. This coupled with the fact that not much waste was generated, man did not feel the necessity to manage it.

Time flew, population grew and before humans knew it, the industrial revolution set in (18th Century). People from rural areas migrated to cities and industrial towns en masse. Human consumption began to get concentrated and waste began multiplying. The proliferation of waste led to many diseases such as bubonic plague, cholera and typhoid, which led to suffering and death.

From this event on, the industrialized nations realized the importance of waste management.

Recovering Resources From Waste

As the world population increases and waste grows in volume, the world’s scientists and planners have evolved technologies to recover resources from waste, which can be used again. For example, the developed nations have sophisticated facilities that convert the calorific content present in waste into electricity. In developing nations, manual laborers sift through the waste and extract recyclable material from it, thereby reducing the volume of waste that needs to be disposed.

Recycling Waste

The term recycling is universally associated with waste management. When we say recycle, we mean that our everyday waste will be collected, processed and then reused in another form. For example, products made out of paper, aluminum, plastic are collected and converted back into paper, aluminum and plastic respectively. Recycling of waste items made up of one material is an easy task.

Electronic waste is sent to developing nations where recycling plants extract gold and copper from the e-waste. Used automobiles are scrapped and their metal is sold to scrap lots, which then sell the metal back to factories for re-conversion. And so on.

Waste Management Techniques

Nations employ many techniques to deal with their waste. Here is a brief roundup of these techniques:

1. Landfill: This is the most traditional way of managing waste, by dumping it in a landfill. Countries such as Australia that have vast expanses of land, normally dispose their waste in abandoned quarries or mines. A landfill is an inexpensive way to get rid of waste. However, care should be taken to ensure that only waste that does not harm the environment is dumped in landfills. Populous countries or small countries, such as Japan, have to resort to other means to manage their waste.

2. Incineration: Incineration is the disposal of waste by burning it. However, incineration is not an effective tool for waste management as the burning of waste consumes resources and energy, destroys the recyclable material present in the waste and emits many harmful pollutants.

3. Composting: Composting is a technique in which organic waste materials (food, plants, paper) are decomposed and then recycled as compost for use in agriculture and landscaping applications.

4. Mechanical Biological treatment: In this technique, a variety of waste (plastic, paper, glass, etc.) are fed in bulk into the waste treatment plant. The MBT process extracts the recyclable content in the waste and converts it to calorific fuel that can be used by cement/power plants.

5. Pyrolysis and Gasification: These are thermal techniques, using these, waste is treated at high temperatures and at a very high pressure. In Pyrolysis, the waste material is converted to solid or liquid. The solid material can be further refined into a carbon form while the liquid extract can be used as energy-giving oil. In gasification, the waste material is converted into a synthetic gas, which can be burned to produce more energy.

In conclusion, waste management has become part of our survival strategy. If we have to live, we will produce waste. If we do not treat waste, it will choke us. Waste is a problem, waste Management is the solution.

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