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R.O. Reject Water Disposal

01/22/2012 1:11 AM

Hi All,

I am looking into resolving the issue of disposing of about 1000 cubic meters / day of Reverse Osmosis reject water in a desert climate yet very humid ( Dammam, Saudi Arabia). Hoping for innovative and not very expensive suggestions, with thanks in advance.

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#1

Re: R.O. Reject Water Disposal

01/22/2012 1:41 AM

How about using it for irrigation--or is it too salty or something?

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#2
In reply to #1

Re: R.O. Reject Water Disposal

01/22/2012 1:59 AM

The salinity is very high to the point that its not even allowed to re-inject back to the ground.

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#3

Re: R.O. Reject Water Disposal

01/22/2012 2:08 AM

Why can't you pump it back into the ocean?

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#4

Re: R.O. Reject Water Disposal

01/22/2012 12:50 PM

Was this originally seawater? Can you disperse to evaporation ponds and harvest the resulting salt?

Gourmet sea-salt could provide some income from what otherwise would be a waste stream.

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#6
In reply to #4

Re: R.O. Reject Water Disposal

01/22/2012 2:16 PM

The water source is ground wells, the sea side is about 70 km away, and the produced soild salts among other substances are not eadible, evaporation ponds need about 1.5 million square meters, so now you can understand my delema.

Some of the solutions tossed around are installing some kind of industrial furneces, or removing theis water via a fleet of tankers....

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Guru
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#5

Re: R.O. Reject Water Disposal

01/22/2012 1:30 PM

I always wanted to make a fountain with the reject stream. On some machines it leaves at a fairly high pressure, easy enough to get to the fountain with the new high pressure plastic lines available. The water would evaporate, leaving a constantly growing salt statue. Lots of room for creativity there.

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#7

Re: R.O. Reject Water Disposal

01/22/2012 3:15 PM

Given your numbers that would equate to around 55 - 65 tanker truck loads of heavy salt water being produced everyday. Around here the oil drilling rigs would pay big money for that stuff to use in the drilling operations.

If you don't have such users anywhere near you then the most practical disposal method is probably going to be trucking or piping it out to sea unless you have some salt water aquifer thats too nasty to pump from as is where you can safely pump it back down a disposal well and put it there.

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#8

Re: R.O. Reject Water Disposal

01/22/2012 3:17 PM

You are 70 miles from the sea, and you have salt water? You are over a salt mine. Get permission to put the discharge back underground as far away from your wells as possible.

The only thing I know to make from salt water is chlorine.

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#9

Re: R.O. Reject Water Disposal

01/22/2012 3:26 PM

This equates to about 184 gpm of reject water (slurry?) flow. A pipeline to the ocean might be possible, but some care might be needed to maintain continuous flow, so as to avoid solidification of the mix. (This is only food for thought, not a real proposal.)

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#10

Re: R.O. Reject Water Disposal

01/22/2012 6:06 PM

Dammam: I was there once, Spring 91. Start an evaporating pond. Let it simmer until you get a slurry and use it to white wash the walls of your compound. The camels will love it. You might even be able to form it into bricks and use it to pave the local souk.

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#11
In reply to #10

Re: R.O. Reject Water Disposal

01/22/2012 6:56 PM

I was thinking the same thing. This location has lots of sunshine, sand and space. Using the salt for a binder just might make bricks. Shredded old water filters can be used instead of straw....

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#12

Re: R.O. Reject Water Disposal

01/22/2012 6:57 PM
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#13

Re: R.O. Reject Water Disposal

01/22/2012 10:35 PM

That is the golden question my friend. Disposal of the brine/reject water has and still is a real problem.

Although I assume lots of sun, and available land, you mentioned high humidity, which will limit the effectiveness of any evaporative solution. If evap of the reject was an option, I would also suggest a product called salt sails (the brine water seeps down a curtain of material hanging vertically, the large surface area evaporates the water, leaving the salt behind on the curtain, as it grows the wind breaks off the salt. which falls to ground for removal.

But if evaporation of the water is not possible/feasible due to the humidity. You may consider some alternatives.

1. HERO Process, can achieve up to 95% recovery (rather than the 40% recovery you'd get from seawater or highly saline ground water). Much reduced volumes. Note this is patented method. Google for more info.

2. GE EDR. Currently in Australia this is real problem for the coal seam gas industry. The massive volumes of waters generated by coal seam gas production mean that the brine/waste streams must be minimised to less than 5% to make overall production possible. It is my understanding that GE is developing a modified EDR process to selectively precipitate out dissolved solids from the water (ultimately to achieve near 100% recovery). And the technology is near market ready. Link below ...

http://www.genewscenter.com/content/Detail.aspx?ReleaseID=13386&NewsAreaID=2

Paraphrased from the link ...

SYDNEY, AUSTRALIA-October 24, 2011-The GE and Penrice Consortium, ... announced an agreement with Australian coal seam gas producer QGC Pty Limited to design, build and operate a brine pilot plant (BPP) ... is part of a wider initiative by the coal seam gas industry to investigate the technical and commercial viability of producing products such as table salt and soda ash from brine, a by-product of coal seam gas water treatment. ... based on technology developed by the GE and Penrice Consortium, for the purpose of extracting salts from CSG water and produce commercial grades of sodium bicarbonate, soda ash and sodium chloride.

So it appears a real solution may be just around the corner.

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#14

Re: R.O. Reject Water Disposal

01/22/2012 11:15 PM

Set up a plant to manufacture chlorine,caustic,baking soda,washing chemicals etc

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#15

Re: R.O. Reject Water Disposal

01/22/2012 11:22 PM

Solar ponding is a good suggestion. Is it possible to divert this reject water into the city STP,if it is designed to take this load, and use the treated water for landscaping?.

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Guru

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#16

Re: R.O. Reject Water Disposal

01/23/2012 12:13 AM

Is there a sewerage system that you can discharge into?

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#18
In reply to #16

Re: R.O. Reject Water Disposal

01/23/2012 2:00 AM

No-infra structure installation is available what so ever, and the water table ( Ground Water Level) is between 30 and 50 cm below Natural Grade Level so the site itself is elveated by soil improvment compacted layers reach 3.5 m above NGL.

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#17

Re: R.O. Reject Water Disposal

01/23/2012 12:34 AM

I can solve that with my Electro coagulation techniques.

We can discuss in detail outside.

Please contact.

mm

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#19

Re: R.O. Reject Water Disposal

01/23/2012 4:59 AM

Presumably there is an Environmental Impact Assessment Report document as part of the plant's design brief? What does it say, and what has changed since the report was written?

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#20
In reply to #19

Re: R.O. Reject Water Disposal

01/25/2012 1:19 AM

Could be that a solution is required in order to prepare just such a report...

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#21

Re: R.O. Reject Water Disposal

01/26/2012 8:17 AM

The first part you got to do is to go for second & third stage R.O passage extensions, just to reduce the volume of your slurry- may be to the extent of 75 percent reduction in volume where by which you can recover around 750 Cubic meters of potable grade water. Make trials with your R.O supplier & get convinced.We will further discuss on effective solar evaporation means & salt recovery systems.Post your reply comment on how many R.O passages you are currently doing.

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#22
In reply to #21

Re: R.O. Reject Water Disposal

01/28/2012 1:42 AM

Convert the saline water to Sodium salts by passing through Softner and recover much higher amount of water to reduce disposal problems.All Sodium salts have high solubility and as such "yield" of RO will be much higher. The reduced quantity of reject will have high concentration of Sodium salts.If you can saturate it with more such salts at higher temperature and then allow it to cool at night,you get clear water and crystalline solids separated. So thereby get more water too. Solid disposal should not be a problem. Regeneration water of Softner can be evaporated via various means already suggested.

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#23

Re: R.O. Reject Water Disposal

01/28/2012 2:33 AM

In Namibia we use this kind of by-product as a low cost effective 'binder' on dirt roads. Our coastal roads are almost as good their tarred counterparts. If it is already in solution form, then one would only have to spray your RO waste on existing dirt or gravel roads to upgrade them.

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#24

Re: R.O. Reject Water Disposal

04/06/2012 6:03 PM

if you have access to Natural gas (may be other fuels) and the cost of $0.02per gallon or $5.0/m3 acceptable then send me an email *. I have a solution for you/

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#25

Re: R.O. Reject Water Disposal

12/22/2013 7:39 AM

I have the same problem, is there any solution ?

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