Biology
water recycling
What is recycling of
water?
•

Treatment of wastewater is
actually a remarkably simple
process that utilizes very basic
ph...
How is it done..?
• recycling graywater can
also be doncost-benefit
analysis of a free, more
labor-intensive system
versus...
How is it utilized?
•

•
•
•
•

Recycled water can be used for
almost any use, as long as it is
treated to a level to make...
chemistry
Hardness of
water
what causes hard water?
•

A c o mp o u n d c a l l e d
c a l c i um hy dr oge n
c a r bona t e i s t he
ma i n c a u s e ...
How to remove hardness of water?
• Ba
p r
c h
me
wh
s o
p e
h a
wa
d o
l a
o r
h o
p u
i s
p o
e f
me
s o

s e e x c h a n...
Physics:
water as an energy
resource
Tidal energy
•
•

•

Jump to: navigation, search
Tidal energy, sometimes called tidal
power, is the power achieved by
capt...
Wave energy
•

•

Wave energy is the transport of
energy by ocean surface
waves, and the capture of that
energy to do usef...
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Science

  1. 1. Biology water recycling
  2. 2. What is recycling of water? • Treatment of wastewater is actually a remarkably simple process that utilizes very basic physical, biological, and chemical principles to remove contaminants from water. Use of mechanical or physical systems to treat wastewater is generally referred to as primary treatment, and use of biological processes to provide further treatment is referred to as secondary treatment. Advanced secondary treatment usually involves applying chemical systems in addition to biological ones, such as injecting chlorine to disinfect the water
  3. 3. How is it done..? • recycling graywater can also be doncost-benefit analysis of a free, more labor-intensive system versus an installed, more expensive system is going to be a no-brainer: a free or cheaper system is usually the way to go. Many people who recycle their graywater bootleg it anyway (especially in California, where the legalities are so complex that it makes it almost impossible to recycle water for less than $5,000 or $7,000).e at home
  4. 4. How is it utilized? • • • • • Recycled water can be used for almost any use, as long as it is treated to a level to make it fit for that intended purpose (i.e. fit-for-purpose) from a health and environmental perspective . However, the cost of treatment may make reclamation uneconomical for some uses. Australia now has more than 600 different recycled water schemes operating. The bulk of these schemes involve: Urban and municipal environments Households, golf courses and recreational parks. Industry Washing and cooling in power stations and mills.
  5. 5. chemistry Hardness of water
  6. 6. what causes hard water? • A c o mp o u n d c a l l e d c a l c i um hy dr oge n c a r bona t e i s t he ma i n c a u s e o f h a r d w a t e r . I t f o r ms wh e n r a i n f a l l s o n l i me s t o n e a n d c ha l k r oc k s . The s e r o c k s a r e ma d e o f c a l c i um c a r bona t e , wh i c h i s i n s o l u b l e i n wa t e r . Be c a u s e r a i n wa t e r c ont a i ns c a r bon di ox i de , di s s ol v e d f r om t he a i r , t hi s ma k e s i t a c i d i c . T h e r a i n wa t e r r e a c t s wi t h t h e r oc k s t o f or m c a l c i um
  7. 7. How to remove hardness of water? • Ba p r c h me wh s o p e h a wa d o l a o r h o p u i s p o e f me s o s e e x c h a n g e o c e s s ' i s a e mi c a l t h o d b y i c h , f t e n i n g o f r ma n e n t r d n e s s i n t e r c a n b e n e o n a r g e s c a l e f o r u s e h o l d r p o s e s . I t t h e mo s t p u l a r a n d f e c t i v e a n s o f f t e n i n g
  8. 8. Physics: water as an energy resource
  9. 9. Tidal energy • • • Jump to: navigation, search Tidal energy, sometimes called tidal power, is the power achieved by capturing the energy contained in moving water in tides and open ocean currents. There are two types of energy systems that can be used to extracted energy: kinetic energy, the moving water of rivers, tides and open ocean currents; and potential energy from the difference in height (or head) between high and low tides. The first method - generating energy from tidal currents - is becoming more and more popular because people believe that it does not harm the environment as much as barrages or dams. Many coastal sites worldwide are being examined for their suitability to produce tidal (current) energy
  10. 10. Wave energy • • Wave energy is the transport of energy by ocean surface waves, and the capture of that energy to do useful work – for example, electricity generation, water desalination, or the pumping of water (into reservoirs). Machinery able to exploit wave power is generally known as a wave energy converter (WEC). Wave power is distinct from the diurnal flux of tidal power and the steady gyre of ocean currents. Wave-power generation is not currently a widely employed commercial technology, although there have been attempts to use it since at least 1890.[1] In 2008, the first experimental wave farm was opened in Portugal, at the Aguçadoura Wave Park.[2] The major competitor of wave power is offshore wind power.

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