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Desalinization
Three quarters of the earth is covered with water, but you can’t drink it. Turning salt water into fresh water for drinking and for watering crops is vital for the future of the human race. Questions about desalinization (or desalination) are answered here.
245 Questions
What is calcium carbonate scale and calcium sulphate scale in desalination plant?
Scale formation represents a major operational problem encountered in thermal desalination plants. Scale may form because of the composition of the make-up, but mostly develops as a result of further change occurring during evaporation. Scale formation is mainly caused by crystallization of alkaline scales, e.g., CaCO3 and Mg(OH)2 and non-alkaline scale, e.g., CaSO4. The formation of CaCO3 scale strongly depends on temperature, pH, and the release rate of CO2 as well as on the concentrations of HCO3-, CO32-, Ca2+, and Mg2+ ions. Scaling in industrial processes is affected by the following factors: (i) bulk variables and composition, i.e. CaCO3 precipitation potential, pH buffering capacity, chloride and sulfate concentrations and concentration of dissolved oxygen, (ii) thermal effect, i.e. heat flux, surface temperature and bulk temperature, (iii) flow field, i.e. velocity of flow and solid/liquid interface conditions and (iv) substrate properties, i.e. materials properties and surface conditions.
In previous works, Al-Rawajfeh et al. [1-3] have modeled the CO2 release rates in multiple-effect distillers (MED)distillers. This model did not account for the deposition of alkaline scale and its effect on CO2 release rates. Calcium carbonate and magnesium hydroxide were assumed to precipitate at negligible rates. Recently, Al-Rawajfeh [4,5] developed a model to simulate the simultaneous release of CO2 with the deposition of CaCO3 and investigated their mutual release-deposition relationship in MED [4] and in the flash chambers in MSF distillers [5]. The influence of CO2 injection on the carbonate chemistry and the scale formation were also studied [6]. The model begin to calculate the CaCO3-Mg(OH)2 (alkaline) scale in the brine chambers, because part of the scale is deposited there and will be reduced from the total scale precipitate or reduce the ions available to precipitate CaSO4 scale inside the tubes when it is recycled with the make-up. Details on the CO2 release and alkaline scale modeling can be found in previous works [1-6].
REFERENCES
[1] Al-Rawajfeh, A. E., Glade, H., Ulrich, J., CO2 release in multiple-effect distillers Controlled by mass transfer with chemical reaction. Desalination, vol. 156, PP. 109-123, 2003.
[2] Al-Rawajfeh, A. E., Glade, H., Qiblawey, H. M., Ulrich, J., Simulation of CO2 release in multiple-effect distillers. Desalination, vol. 166, PP. 41-52, 2004.
[3] Al-Rawajfeh, A. E., Glade, H., Ulrich, J., Scaling in multiple-effect distillers: the role of CO2 release. Desalination, vol. 182, PP. 209-219, 2005.
[4] Al-Rawajfeh, A.E., Modelling of Alkaline Scale Formation in Falling-Film Horizontal-Tubes Multiple-Effect Distillers. Desalination, vol. 205, PP. 124-139, 2007.
[5] Al-Rawajfeh, A.E., Simultaneous desorption-crystallization of CO2- CaCO3 in multistage flash (MSF) distillers. Chem. Eng. Proc., Proc. Inten., vol. 47, PP. 2262-2269, 2008.
[6] Al-Rawajfeh, A.E., Al-Amaireh, M. N., The influence of CO2 injection on the carbonate chemistry and scaling in multiple-effect distillers. Desalination & Water Treat., vol. 7, PP. 191-197, 2009.
How many desalination plants are in Illinois?
Illinois does not need desalination plants. It has plenty of fresh water from Lake Michigan.
What are the pros and cons of the desalinization process?
- the pros of desalinization include: it makes more water, it pearifies ocean water, and its good for you. the cons of desalinization include: highly expensive, works for a bit, and hard to find.
Why isn't desalination used more?
Desalination isn't used more often because it cause's a waste stream called brine and the discharge of chemicals and all that waste can affect the marine life
To remove salt from drinking water. Drinking saline water causes mental problems and can lead to death. The body can only handle certain quantities of salt - to much causes imbalances that, as mentioned above, can cause serious health problems.
How do you get desalination job?
To secure a job in desalination, start by obtaining a relevant degree in engineering, environmental science, or a related field. Gain experience through internships or entry-level positions in water treatment or environmental projects, and consider specialized training in desalination technologies. Networking with professionals in the industry and staying informed about advancements can also enhance your opportunities. Finally, actively search for job openings in companies or organizations focused on water resources and desalination.
Why would countries use the desalination process?
Desalination is a process that removes mineralsfrom saline water. More generally, desalination may also refer to the removal of salts and minerals,[1]as in soil desalination, which also happens to be a major issue for agricultural production.[2]
Salt water is desalinated to produce fresh water suitable for human consumption or irrigation. One potential by-product of desalination is salt. Desalination is used on many seagoing ships and submarines. Most of the modern interest in desalination is focused on developing cost-effective ways of providing fresh water for human use. Along with recycled wastewater, this is one of the few rainfall-independent water sources.[3]
Due to relatively high energy consumption, the costs of desalinating sea water are generally higher than the alternatives (fresh water from rivers or groundwater, water recycling and water conservation), but alternatives are not always available and rapid overdraw and depletion of reserves is a critical problem worldwide. Quoting Christopher Gasson of Global Water Intelligence, "At the moment, around 1% of the world's population are dependent on desalinated water to meet their daily needs, but by 2025, the UN expects 14% of the world's population to be encountering water scarcity. Unless people get radically better at water conservation, the desalination industry has a very strong future indeed."[4]
Desalination is particularly relevant in dry countries such as Australia, which traditionally have relied on collecting rainfall behind dams to provide their drinking water supplies. According to the International Desalination Association, in June 2011, 15,988 desalination plants operated worldwide, producing 66.5 million cubic meters per day, providing water for 300 million people.[5]This number has been updated to 78.4 million cubic meters by 2013,[4]or 57% greater than just 5 years prior. The single largest desalination project is Ras Al-Khair in Saudi Arabia, which produced 1,025,000 cubic meters per day in 2014,[4]although this plant in Saudi Arabia is expected to be surpassed by a desal plant in California.[6]The largest percent of desalinated water used in any country is in Israel, which produces 40% of its domestic water use from seawater desalination.[7]
Where does the salt initially go in a desalination plant and how is it removed from the desalinator?
Salt water is pumped through a very fine membrane which does not allow the salt to pass through (osmosis). Only part of the water is "desalinated". The rest, with all the salt, is usually pumped back into the ocean, at some distance away from the plant.
What science is behind working in a desalination plant?
Evaporation and condensation of water - that is the basic one... Others could use reverse osmosis, which is far more effective, but very expensive...
Why should the desalination plant be built?
Because only three percent of the world's water is potable. And with man-made pollution that number is going down.
What id the meaning of recovery ratio in RO desalination plant?
It is the ratio of permeate over the feed water.
Opposition to the construction of desalination plants often stems from environmental concerns, such as potential harm to marine ecosystems due to the intake of seawater and the discharge of brine. Critics also argue that desalination is energy-intensive, contributing to carbon emissions and climate change. Additionally, some community members fear the potential for increased water rates and the prioritization of large-scale projects over more sustainable water conservation methods. Lastly, there may be concerns about the impact on local economies and water equity for marginalized groups.
What is mean by desalination of brackish water?
Brackish means slightly salty. Desalination is the process of removing the salt.
How are desalination and the water cycle similar?
they are, but they are not.
The water cycle has water (Lake or ocean, fresh or salt) that evaporates (leaving any salt behind) to become clouds, which rains fresh water that runs back to the sea.
Desalination is a process that uses various methods to remove the salt from sea water to make it drinkable.
Distillation is the only form of desalination that comes anywhere close to the water cycle, since it involves changing the state of the alter from liquid to gas and back again. Other desalination processes do not change the state of the liquid, but filter it remove the salt and make it potable and same for human consumption.
Desalination is expensive because it requires what?
Desalination requires a lot of of energy or electricity, which makes it expensive.
Are desalinization and desalination interchangeable words?
Yes. Desalinization is a redundant and incorrect form, so desalination only should be used.
The positive and the negative things about the desalination plant?
well the negative things are:
- fish and other animals could get stuck in the pipes.
- most animals in the ocean would die, because of less water.
-we don't no if the water would taste the same.
the positive things are:
-more water for australians
and that's it.
Desalination is expensive because it requires?
It is expensive because if requires a great deal of energy or electricity.
How do you use desalination in a sentence?
Desalination is the removal of salts from solutions in water. There are many ways to use it. An example is: "The ocean water was sanitized and purified by desalination, boiling, and filtration to prepare it for drinking."
Water desalination is the process of removing salt and minerals from seawater to make it suitable for drinking or irrigation. This is typically done through methods such as reverse osmosis or distillation to separate the salt from the water, producing freshwater for consumption. Desalination is an important technology in areas where freshwater resources are limited.
Advantages and disadvantages of desalination plants?
Advantages Disadvantages *It can work as a backup incase the dams run out of water or are low and if there is a drought *It cost to much money to pay for the plants *The ocean is always there and easy to get to *It reduces oxygen levels in the air and results in an increase of the density of any discharged waste water. *Its unlimited source of water. *make more green house gasses so there for more pollution in the atmosphere *It doubles the amount of salt in the ocean's and impacts on the environment for animals and humans.
it allows you to use all the water in the world, the price has been going down
