Jessica's homework

http://www.recyclingfactsguide.com/water/recycling-of-water/

NOTE-TAKING:

The procedure of recycling of water

1.screening of water
____a.sewer system =>large objects filtered
____b. slowing movement=> fatty materials rise the top (remove clarified)
_____ ______________=> small particles____ bottom (remove clarified)
2 .microorganisms break down other materials
____(water aerated help micro…. Thrive)
____a. micro…consume materials =>solids
____b. another clarification=> remove the solids and majority of micro….
3. chlorination of the water
____a.chlorine kill any leftover micro..
____b.sulfur dioxide remove cholorine (harm marine wildlife)
____c.reture water to ecosystem

PLAN:

topic：value the procedure of water recycling

introduction:

water recycling makes it possible to ensure sustainable warter provision.It is hard to image that dirty and polluted water can be used again and there is no harm to human health.Some people may want to find out the reason and the procedure of recycling of water,so i will show it for you in the easy way and do a simple evaluation.

body:

1.how to filter water in water treatment plant

a.This step is mainly rely on sewer system to filter water.A sewer system is used for transporting sewage through a sewer pipe to a collecting chamber and after this system all large objects would be filterd.Thenwith the flow become slower,fatty materials and small particles are isolated ,which can easily remove.

b.improvement and evaluation

2.microorganisms play an important role

a.microoganism can consume leftover materials and in order to filter it more convenient it is necessary to change it into solids .Next,another clarification will eliminate these solids and most of microorganisms.

b.improvement and evaluation

3.remove microorganisms

a.The microoganisms difficult to remove need a powerfull tool like chlorine , harm to wildlife,but sulfur dioxide can remove it.then we can reture the water to ecosystem.

b.improvement and evaluation

conclusion:

a.The water recycling system should be made more perfect.

b.summary