Recycling of used resources and waste, Science

Recycling of used resources and waste:

Some of the materials once used need not go waste, these can be  re-used. The process through which the waste resources are again made usable is known as recycling. Scraps and used metals Scrap metal is produced  in  large quantities  in mills and factories. Old used metal of discarded vehicles, machine, aircrafts, ships, buildings etc. can be melted and recycled for useful purposes. Used aluminium utensils, for example, can be collected, melted and shaped into new utensils. We can meet the growing demand of such scarce metals as copper, zinc, lead, platinum etc. by  recycling the used materials. 

Waste water 

Domestic and municipal waste water is rich in organic nutrients. If this kind of water is made free from disease carrying germs and poisonous elements, it can be used for irrigation of farms, gardens and other vegkations. For the removal of germs and toxic elements, the waste water or sewage is treated in a tank or in ponds for several days. In doing so, the heavy particles settle down to the bottom by themselves, while the finer particles are made  to settle down by  adding alumand caustic soda. The clear liquid is then allowed to pass through filters or sand or earth and finally air is blown through it. This treatment not only removes carbon dioxide and hydrogen sulphide which is generally dissolved  in waste water, but also adds oxygen to the filtered water, thus helping in purification. Treatment of water  with appropriate doses of chlorine, known as chlorination, kills all the harmful germs and makes water usable.  

Posted Date: 9/28/2012 6:46:02 AM | Location : United States







Related Discussions:- Recycling of used resources and waste, Assignment Help, Ask Question on Recycling of used resources and waste, Get Answer, Expert's Help, Recycling of used resources and waste Discussions

Write discussion on Recycling of used resources and waste
Your posts are moderated
Related Questions
Classification  of Vitamins Vitamins  widely  vary from each  other  from  tlie  structural point  of  view. Conventionally, they  are  classified on  the  basis  of  their so

Explain the Physiology of Lactation Lactogenesis is the onset of copious milk secretion around parturition, triggered by a fall in plasma progesterone levels. Although some col

Ecosystem: As far as we know, our earth is the only planet where life exists,  though scientists su constantly searching for signs of life on other heavenly bodies. You have al

1.) Imagine that you are a particle inside an ice cube. You were placed into a glass of lemonade to cool it down. The lemonade has now been drunk and you have been left in the glas

Malnutrition and ill health: Are you familiar with the term malnutrition? Malnutrition means either lack of sufficient food or imbalance of nutrients in the diet, resulting in

Cholagouge action and Absorptive function of bile Cholagouge action: Bile acts as its own stimulus. Bile salts are absorbed from the intestine, carried to the liver and stimula

Describe the factors which decide the broad area of scientific activity?

Explain the Hypoxic Hypoxia It is a hypoxia resulting from defective oxygenation of the blood in the lungs. It is a problem in high altitudes where pO 2 of the arterial blood

Name the six forms of prejudice that Brislin discusses and illustrate each with a South Africa example; 1.  Red-neck racism - a typical form of this prejudice is Julius Malema

1. What is the time complexity of a convolution with an n by n sized kernel when using a direct convolution with a 2d mask, and when using a separable kernel. Each of the answers i