can reverse osmosis be used on sea water?

[ykhuser]

is it possibe to filter out fine salt using reverse osmosis?
if yes, why it is just restrain to filter out human waste and urine and recycle water.

 

[goodtool]

of course lah. Most desal plant now a days r revese osmosis. Singapore have 1 and 2nd one coming up.

 

[Travellor]

if you ask me, it probably a whole bunch of bs crap that the pap spun so that they can pull the wool over those dumbasses up north into believing that we don't "need" their water anymore so they might as well do nthemselves a favour by selling it much cheaper ........hahahaha

 

[QXD]

Reverse Osmosis membranes is in fact used for desalination. It makes no sense to filter out fine salt using RO as salt itself is a solution within water. RO However "filters" the salt water into a permeate (aka - clean water) and a concentrate (aka unwanted water). If you really want the salt, you can evaporate the concentrate portion and retrieve it from there.

Gone are the days when science practical in secondary school taught us to boil a beaker of salt water solution to obtain salt and condense the escaping steam into clean water (Distallation). Nowadays, only the Arabs are dumb and wasteful enough to use salt water distillation, the rest of the world use RO for the heavying lifting portion of water desalination.

 

[Bigfuck]

It is called SWRO and actually, if you know what is the cost of processing sea water to drinking water, you know that Leegime is overcharging you. Arabs are also using SWRO.

 

[Tuayapeh]

tuayapeh says these bastard PAPpies better get to used to drinking more Newater because theres a lot more of where that came from down here......all raw and unfiltered......

 

[SuperMod]

tuayapeh says these bastard PAPpies better get to used to drinking more Newater because theres a lot more of where that came from down here......all raw and unfiltered......

Hahahah ... Ah peh make sure you take " good care " of LKY wife over there

 

[jubilee1919]

No it cannot be used on seawater.

 

[Bigfuck]

Largest SWRO Desalination Plant in the World Inaugurated in Hadera

127M Cubic Meter Plant Built by Israel’s IDE Technologies and Housing & Construction Group at an Investment of ~$430M
Published on D&WR
Published on Water World


Kadima, Israel, May 16, 2010: H2ID, a joint venture of Israel’s IDE Technologies and Housing and Construction Group, will today inaugurate the Hadera seawater desalination plant, the largest Reverse Osmosis plant in the world. With the ability to produce 127 million cubic meters of high quality water per year at a price of $0.57 per cubic meter, under a 25 years BOT agreement with the Government of Israel. This is a groundbreaking facility that continues in the tradition of IDE’s Ashkelon plant, which has been in service since 2005.

The inauguration ceremony was attended by Israel’s President, Mr. Shimon Peres, and other dignitaries from the Israeli government, the H2ID partnership and banks that funded the project.
“This is a very exciting day for IDE, for Israel and for the water industry as a whole,” commented Mr. Avshalom Felber, CEO of IDE Technologies. “The success of the mega-desalination plant concept has ushered in a whole new era of plentiful, affordable water for a world facing severe water challenges. With the launch of the Ashkelon plant in 2005, we pledged to continue pursuing further breakthroughs in plant capacity and water cost. As we take pride in the results of the Hadera plant, we rededicate ourselves to reach for new horizons in the Soreq plant we are now constructing.”

The investment in the construction project which totaled NIS 1.6 billion (approximately) was funded by a consortium of international banks, including the European Investment Bank (EIB); Calyon, the French investment bank; and Esperito Santo (BES), the Portuguese investment bank. The unique financial package earned international recognition, resulting in the project being named the Project Finance Deal of the Year 2007 by Euromoney, a prestigious magazine covering economic sectors.

IDE Technologies is a global Israeli company which is a pioneer and leader in the field of water technology. The company is owned by ICL (50%) and Delek (50%), and has 45 years of experience in the installation of desalination plants around the world. The company specializes in the development, planning, production and operation of desalination plants and other advanced water solutions. IDE has constructed 400 desalination plants of various sizes and technologies in 40 countries – some of them the largest of their type in the world. The accumulated production output of these facilities is over 2,000,000 m3/day. IDE has achieved important technological breakthroughs in the fields of thermal and membrane desalination, and is also active in other fields, including industrial cooling, the production of artificial snow, industrial evaporators and solutions for the re-use of sewage water.

Mon, 2010-05-17

 

[ykhuser]

qns is: if yes, how come we dont use it on seawater instead we used to recycle sewage water and drink it.ist it less disgusting to drink clean seawater than clean sewage water?

of course lah. Most desal plant now a days r revese osmosis. Singapore have 1 and 2nd one coming up.

 

[Ash007]

My guess is, its "easier" to RO sewage water then seawater. Keep in mind that RO is a pretty energy intensive process. You essentially need to push, the denser water, seawater/sewage water through the membranes to filter them. Keep in mind that they are not using raw sewage per se, but there is an additional process of mixing it in the reservoir.

qns is: if yes, how come we dont use it on seawater instead we used to recycle sewage water and drink it.ist it less disgusting to drink clean seawater than clean sewage water?

 

[Tuayapeh]

Tuayapeh doesn't know why sinkies believe everything the PAP says. Tell you eat and drink pee/shit, all guai guai do.

It is all some deep bullshit story to con the idiotic malaysians into disarming the "water threat" and sell their precious resource cheap cheap to singapore!

 

[zhihau]

is it possibe to filter out fine salt using reverse osmosis?
if yes, why it is just restrain to filter out human waste and urine and recycle water.

size of the pores in the RO membrane is the key: water molecule is about 175 pm at its largest, sodium ion about 180 pm. me could be wrong :o:o:o

 

[jubilee1919]

NEWater Process


- The first barrier is the conventional wastewater treatment process whereby the used water is treated in the Water Reclamation Plants.

- The second barrier, and first stage of the NEWater production process, uses microfiltration/ultrafiltration to filter out suspended solids, colloidal particles, disease-causing bacteria, some viruses and protozoan cysts. The filtered water that goes through the membrane contains only dissolved salts and organic molecules.

- The third barrier, and second stage of the NEWater production process, utilizes reverse osmosis (RO). In RO, a semi-permeable membrane filters out undesirable contaminants such as bacteria, viruses, heavy metals, nitrates, chlorides, sulfates, disinfection by-products, aromatic hydrocarbons, and pesticides that cannot pass through the membrane. Hence, NEWater is free from viruses and bacteria and contains very low levels of salts and organic matter. At this stage, the water is already of potable quality.

- The fourth barrier, and third stage of the NEWater production process, acts as a safety precaution. UV disinfection is used to ensure that all organisms are inactivated and the purity of the product water guaranteed. With the addition of some alkaline chemicals to restore the pH balance, the NEWater is ready for use.

 

[watchman8]

My guess is, its "easier" to RO sewage water then seawater. Keep in mind that RO is a pretty energy intensive process. You essentially need to push, the denser water, seawater/sewage water through the membranes to filter them. Keep in mind that they are not using raw sewage per se, but there is an additional process of mixing it in the reservoir.

Raw sewage is used in RO, then the cleaned water is pump into reservoirs. The reservoirs water then go for another round of purification before it goes into tap.

I think it is less energy intensive to clean sewage water than sea water, but I really don't know. Anyone can enlighten us?

 

[jubilee1919]

Raw sewage is used in RO, then the cleaned water is pump into reservoirs. The reservoirs water then go for another round of purification before it goes into tap.

I think it is less energy intensive to clean sewage water than sea water, but I really don't know. Anyone can enlighten us?

Most of what was processed will be taken up for use by industries. Only a fraction of the total is then combined with the rest of our freshwater supply.

 

[watchman8]

It is called SWRO and actually, if you know what is the cost of processing sea water to drinking water, you know that Leegime is overcharging you. Arabs are also using SWRO.

Definitely overcharged. Logic is to reduce wastage and over consumption. I'm ok with water rates as it is only a fraction of what most household pays for electrical power.

 

[Faidenk]

Just to throw in my 80 Riel worth.

I don't really know the cost difference between the 2 but RO does both efficiently. The reason why sewage is chosen over sea water is probably the fact that the sewage is also treated in the same process. The effluent (sewage) is probably first treated by an anaerobic process or aerobic, or both, then goes through the RO. The water coming out is good enough to drink, really! The problem here is public acceptance, so the govt mixes it in the reservoirs. Sewage actually is the easiest to recycle.

The resulting sludge can be further processed as fertilizers but don't know what Singapore does with it, maybe sanitized and repackage out to the people of Singapore via the Braddell Brothel.

Back to your question, yes, sea water can be be RO'd. All the navy vessels, the Indian navy anyway, have small RO plants installed, maybe a 5m3 or 10m3 per day capacity.

 

[Confuseous]

My guess is, its "easier" to RO sewage water then seawater. Keep in mind that RO is a pretty energy intensive process. You essentially need to push, the denser water, seawater/sewage water through the membranes to filter them. Keep in mind that they are not using raw sewage per se, but there is an additional process of mixing it in the reservoir.

Desalination was in fact one of the earlier technologies that was explored for Singapore but at that point in time, the cost relative to other possible production processes was high. Since then, technologies have improved and which is why during the last major tsunami in Sumatra, Hyflux supplied a couple of desalination machines (or whatever they called them) to the villages there.

 

[ykhuser]

IF RO is possible on seawater, why use Desalination?
Desalination Defintion refers to any of several processes that remove some amount of salt and other minerals from saline water. it does not say...boiling the water to get the vapour and consenser the pure vapour back to get water(leaving the salt behind)

maybe Desalination is the general term for process..RO is the technology...i may be wrong

i alway had the thinking RO on saltwater is easlier rather than RO on sewage which contain so many other chemical plus solid waste.
i would rather drink from purify saltwater than purfiied sewgae watrer