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New Process For Nanoscale Filtration Holds Promise of Cheap, Clean Water

drmaxx Current technology is already efficient (116 comments)

Considering that the theoretical minimal energy requirement for seawater desalination is approx. 0.75 kWh/m3 and current RO technology can be as low as 1.5 to 2 kWh/m3 (+ an other 2 kWh/m3 to pretreat the seawater) then I am really wondering how they will gain two orders of magnitude less energy? Can anybody enlighten us about that?

about 2 years ago

Facebook Co-Founder Saverin Gives Up U.S. Citizenship Before IPO

drmaxx Paying tax as an exile US-citizen is not fun! (911 comments)

Paying tax as an US citizen living abroad is not fun. You are double taxed, the rules change every second year, you don't get any straight forward answer from the IRS, you HAVE TO use a tax lawyer to file taxes and you're still not sure that you did things correct. The punishments for doing something wrong are ridiculous (e.g. my friend suppose to pay a 5% fine on her German husbands bank account, as a punishment that she did not list his account in her tax form although she has access (credit card) to his account). Even if you try to do the right thing you get treated as a potential criminal. And this for paying money to the US and not using any of the benefits you suppose to get from taxes. As long as the IRS doesn't make it easier for their citizens abroad to get rid of their money they will see many more of these cases.

more than 2 years ago

Beneath Africa, Survey Finds 'Huge' Water Reserves

drmaxx Not news... (292 comments)

It's not new that there are huge groundwater resources in Africa. The only new thing in the article is that they mapped it in more detail then ever before. And these resources are also heavily utilized today. However, using groundwater for food production is not without great danger - the keyword here is salinification.

more than 2 years ago

Alaska To Export Billions of Gallons of Water

drmaxx Desalination: Reverse osmosis or Nanofiltration (290 comments)

You can use nanofiltration or reverse osmosis for making salty waters drinkable. The difference is that RO eliminates all the salts (ions) and nanofiltration most of it. Nanofiltration less energy intensive and therefore cheaper.

more than 4 years ago


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