bringing salt water inland.
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Debate Rounds (3)
Im not a scientific person and I havent done any numbers or calculations. this is just my best guesstimation. It has been boggling my mind. could it be done, is there like minds like mine. im still against the creating a lake.
Many survivalist websites also recommend a person have a gallon of water per day (http://water.usgs.gov...). Obviously people probably survive on less at times, but a gallon per person makes the math easier.
So with all that in mind the above process running between 6-2 kWh would make enough fresh water an hour for 1000 people. Running 24 hours a day would make the process able to out put 24,000 people with enough water for that day. For a year the process would make enough freshwater for 8,064,000 for a day. It may seem like a lot but if we look at people who rely on that source and account for people drinking water every day we are back to our original 24,000.
Even that number seems pretty good I mean just make a place for a smaller population, and make more water desalination, right? The problem is when we get to the factor of energy issues start to come up. I won't get into the math quite yet but there are some factors I want to bring up that are worth noting.
As of right now the best types of energy we have for this process are electrical and solar, because of their efficiency and ability to transfer/be set up relatively easily. Solar panels are not as efficient as they seem and I am fairly certain they would not be able to supply enough power (again haven't done the math on it yet). Electricity seems to be the next best option, but where does electricity come from.
Natural gas = 33%
Nuclear = 20%
Hydropower = 6%
Other renewables = 7%
Biomass = 1.6%
Geothermal = 0.4%
Solar = 0.6%
Wind = 4.7%
Petroleum = 1%
Other gases = <1%
Coal needs water to help the electrical generation process, although the water is put back into the water sources it's pulled from, if we need more energy and more coal plants they'll need to use more water. Same thing with Natural Gas, and Nuclear power, expect Nuclear power also wastes some water.
The biggest challenge in this debate will be to determine if the water we get is worth the energy we need to make it. I look forward to the discussion.
I'm not talking about bottling the water and distributing it, possibly the salt left behind and selling that. Even though it would be in minuscule amounts but still worth something to someone right?
Natasha Wright is still working on the project as far as I know. So there is a possibility that desalination by solar power would be an ideal method.
The largest issues with this, however is that solar power is limited to the amount of sun in a day. Also most of the water that evaporates is because of natural vapor pressure a liquid has at a given temperature. The suns help is more of keeping temperature high. Higher temperatures, in this case, mean more vapor pressure/water evaporation. The sun doesn't really give enough energy to make the water boil though for that it needs to get the temerity up really high. Sea water doesn't boil until it reaches 212"F. There is always some vapor amount in the air above water though, so I suppose if you had a way to constantly collect it the water it would keep evaporating. The dehumidifier idea seems somewhat logical besides, the need to power the unit. If you could somehow just pull the water out of the air maybe it could be separated from the salt that way. Although dehumidifiers are very sensitive to ions like salt so it could end up ruining the unit, unless you used some other heat transfer system that didn't use common refrigeration.
Another point I see other scientists makes it that as far as making salt water drinkable out of all the methods currently being used filtration seems to be the most effective when you consider cost.
As far as selling the salt goes "On average, seawater in the world's oceans has a salinity of approximately 3.5%"(https://www.sciencedaily.com...). So let's say you were able to collect all the salt from a gallon of water. From some math (I can show if needed) that would give you about 163.52 grams of sea salt.
That amount sold in stores is about $2.00. Someone has estimated that the cost to maintain a village in Africa for a year is around $130,000 (https://www.quora.com...) that would mean you would have to be perfectly evaporating salt out of water at a rate of 8 gallons a day to make enough money for that....well that's if you make 100% profit, ignoring overhead,labor,shipping, ect...
I am not against the idea of it but I don't think the sun would produce enough energy for that, and if you start adding things like humidifiers, heaters, ect.. that all adds cost to the overall process.
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