Recycling of used resources and waste, Science

Assignment Help:

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.  


Related Discussions:- Recycling of used resources and waste

Procedure of unserviceable and obsolete items, PROCEDURE 1. Assume tha...

PROCEDURE 1. Assume that your Counsellor is the Head of the Institution. 2. Your Counsellor will choose three of you and form a Survey Committee as follows: one of yo

Define pus - abnormal constituent of urine, Define pus - abnormal constitue...

Define pus - abnormal constituent of urine Pus: Pus cells are found in the urine in infections of urinary tract. Pus is actually a viscous, yellowish-white fluid formed in infe

Define growth hormone (gh), Define Growth Hormone (GH) It is a protein ...

Define Growth Hormone (GH) It is a protein containing 19lamino acids in a single chain. It is secreted by somatotrophs throughout life even though growth stops at adolescence.

Explain the functions of the kidney, Explain the Functions of the Kidney ...

Explain the Functions of the Kidney The functions of the kidneys, as you already know, are to form urine and to pass urine for excretion, maintain water and electrolyte balance

Explain extrasystole and compensatory pause, Explain Extrasystole and Compe...

Explain Extrasystole and Compensatory Pause During the relaxation period, cardiac muscle is in the relative refractory period i.e. sleeping but only just. If a sufficiently st

Rejection of heliocentrism, Rejection of Heliocentrism: This happened...

Rejection of Heliocentrism: This happened  in the year  1918 when the astronomer Harlow Shapley (1885-1972) first surveyed the size and shape of  the Milky Way Galaxy. He  sh

Immune mechanisms - physiology of growth and development, Explain the Immun...

Explain the Immune mechanisms - Physiology of Growth and Development The immune system starts functioning in a baby through the inherited antibody (Ab) of the mother. But these

Quiz, I have a vocabulary quiz tommorrow! WHat am I supposed to do

I have a vocabulary quiz tommorrow! WHat am I supposed to do

Emroyology, what is tetrology of fallut? write down the emroyological basis...

what is tetrology of fallut? write down the emroyological basis of this condition?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd