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What is thee different between Multiple flash distillation of sea-water treatment for drinkable usage?
And RO in sewage treatment for advance treatment? In term of cost and energy? Advantages and disadvantages.


Note:
Because I am doing a project about sewage treatment…in my country they don’t treat sewage by RO. I wrote about the possibility of applying RO in my country, but I've been asked by the professor to look at it in term of the cost, environment/ green living, and energy usage

Used to serve in the Navy. We had distillation plants that produced feed water for boilers and potable water. The production was supervised by one guy round the clock and it was hot work. Water use was carefully controlled. Now the ships use reverse osmosis and there are no more water restrictions.

Distillation of sea water is very energy intensive. Disadvantages are many including significant increase in the temperature and salinity of water near the distillation plant causing changes in the local environment. Apparently the water from shore installations tastes pretty bad too. Includes anything that evaporates at temperatures and pressures used. In the ship we couldn't distill water within 12 miles of the shore for fear of contamination. Drove through an oil slick once. Disaster.

Distillation requires evaporation of water. Salts and most other minerals do not evaporate. The process is made more efficient by operating at a partial vacuum thus allowing evaporation at lower temperatures.

I don't know much about Reverse Osmosis except that it is certainly more energy efficient than distillation. I'd be looking at how the quality of water at the input affects quality at the output. It is possible to buy small RO devices for recreational sailboats so that says a lot about energy efficiency.

2008-05-04 08:07:54 by Meme S

An overview of how waste water is treated....

I have a science assignment. It asked that how does our used water, such as the water we flush or from our washing machine, get back to the treatment plants?

Typically wastewater from your house will enter a gravity flow collector sewer and procede to a larger gravity main. Where conditions do not allow for gravity flow, waste water collects at lift stations. At the lift station, the wastewater is pumped mechanically either to the treatment plant, or to a point where gravity flow can resume. You may find this site to be of use:

http://www.lasewers.org/sewers/about/how _sewer_works.htm

2008-12-15 18:23:54 by helenma98

Price: $185.00

Bosch told me not to use vinegar to descale and suggested a humidifier descaling solution. Not sure whether to use a humidifier water treatment solution or a humidifier bacteriostat solution?

Try to find humidifier water treatment solution.
Or, ask Bosch what kind of acid/water solution will work (such as sulferic). I use acid (very little) on my tea kettle every 6 to 12 months and it does a great job.

2007-12-05 16:30:22 by beats4u27

Price: $14.99 $9.99

Ideal for longer trips and group water treatment
Liquid drops are easy to dispense
Large container water treatment a quick process

I just got my ear cartilage pierced and I got the neat-o salt to help it heal. I just don't really know how to treat it. I mixed the treatment and tried to stick my ear in it, but I had to lay awkwardly sideways in order to get my ear in there and I didn't feel like my ear was actually getting saturated in the stuff.

Can I just soak the water in a cotton ball or something? Would that work the same way?

If you get plastic cups that fit over your ear you can position it just right and it will act like a suction cup and nothing will leak out if you put your head straight. However you will still need to hold it so the weight from the water doesn't make the cup fall.

2008-08-18 18:21:49 by Miss Jinxy

Are viruses such as AIDS destroyed from the chemicals in the water treatment plants, or do they die before that? Also, if the chemicals used to treat water are harsh enough to kill strong viruses, then how can it be safe to drink?

Most water treatment plants use chlorine to kill viruses and bacteria. Some water treatment plants use other disinfectants such as ozone or ultraviolet light to kill or inactivate pathogens (disease causing microorganisms). These plants will typically use some chlorine to prevent regrowth in the distribution system.

As for why chlorinated water doesn't harm people: chlorine reacts with organic substances such as the food you've eaten or even the lining of your stomach so quickly that it is consumed and becomes inert before it can hurt you. The chlorine is in such trace amounts that you'd have to live in and breathe in the chlorinated water for it to start harming you. This, by happy chance, is exactly what water borne diseases do. Even a couple of accidental gulps of swimming pool water, which typically has over 50 times as much chlorine as drinking water, won't hurt you.

2008-05-01 10:53:59 by etsuya