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레포트 > 공학계열

[반응공학] 분리막

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레포트 > 공학계열
2012.02.11
51페이지 / pptx
2,400원
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소개글

[반응공학] 분리막에 대한 자료입니다.

1.History
2.Current technologies for water purification
3.Pre-treatment / Nano particle
4.RO Membrane
5.Nano filtration
6.Market & Social needs

본문내용

2000 B.C - The first recorded (The Susruta Samhita, Sanskrit writing) water purification began with the Egyptians. It is said that impure water should be boiled over a fire, heated in the sun, have a hot iron dipped into it or purified by filtration through sand and course gravel.

A major step in the development of desalination technologies came in the 1940s during World War II when various military establishments in arid areas needed water to supply their troops.

In 1949, UCLA first investigated desalination of seawater using semipermeable membranes. Researchers from both UCLA and the University of Florida successfully produced fresh water from seawater in the mid-1950s.

MED is a distillation process often used for sea water desalination

MED consists of multiple stages or "effects“. In each stage the feed water is heated by steam in tubes

MED purifies water through the use of heat, to “boil” off and re-capture the pure water over a number of cycles or “effects”, leaving the unwanted solids behind

Each stage essentially reuses the energy from the previous stage.

majority of water must be pumped from its source or directed into pipes or holding tanks
to remove large debris such as sticks, leaves, trash and other large particles
water stored in reservoirs for periods between a few days and many months to allow natural biological purification to take place
salts are treated with soda-ash (Na2CO3) to precipitate CaCO3 out utilizing the common-ion effect
chlorinated to minimize the growth of fouling organisms on the pipe-work and tanks

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