RO reject water recover

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we have DM plant and for that we used TWO stage RO for Dm feed that second stage RO reject water is around 180 kl/day  and that water we want to recover and reject water analysis as below

 

PH                  =8.11

TDS                =5922

TDS. EVPO.  =9200

TH                  =1928

CAH               =924

MGH              =1004

ALKP             =110

ALKM            =1240

CL                  =3556

SO4               =4626

FE                  =52.8

SIO2              =137

PO4               =12

please any body suggest us how to recover this water and reduce this quantity.

 

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13 Answers

  2. We at UET provide our customers with recycled water from RO systems as part of our normal  business.  Looking at the water analysis presented, we should be able to recover 50% of it at the following values: pH = 8; TDS = 800; TH = 700; ALKM = 300; CL- = 500; SIO2 = 50.  Should you wish to receive a quotation, please send to me a P&ID diagram of your installation.  David

  3. Up to 80-85% of this water can be recycled using  a  BWRO +SWRO combination.  Rest can be used for ash quenching or road spray/ Mine dumping.  Other alternative is go for a  (MEE) evaporator  opex and capex  both will be very high.  

  4. Pl contact vbbajpayeeManish Nema (mnema007@gmail.com) 

  5. It is not clear whether you are using a 2 stage or 2 pass RO process for your boiler feed.

    The water analysis totally confusing. You may contact with full details for proper solution. ppchem.maan@gmail.com 

  6. Hi,

    you can consider using NEXED electro chemical low pressure  desalination technology for recovering RO reject water. This is a electrical driven technology and does not get fouled by high concentration of reactive silica present in your reject. RO technology to recover this water is not advisable. There is a technology available to remove reactive silica selectively. You can write to me separately so that I can help you with your problem.

     

    regards 

    Raman

  8. recirculate/reuse R.O. reject water after passing it through water conditioner,a device which converts hard water into soft water in natural way without adding any chemicals. 

  9. It is not for nothing that this is reject, At higher operational costs you can recover more as per our fellow experts opinion. But in the end you end up with too scaling water. Check out Salttech http://www.salttech.com/ that has many references in the water spares fracking business in the US. SMart way of concentrating brine until salt slurry is produced, without scaling on your walls.

  10. You can recover salts from RO waist water and use there salts for pest control chemicals . And agriculture pesticides chemicals .

    Otherwise make injections well and disposal waist water in deep well must be deep more than two hundred feet below from end cap of your source well . 

  11. You can recover salts from RO waist water and use there salts for pest control chemicals . And agriculture pesticides chemicals .

    Otherwise make injections well and disposal waist water in deep well must be deep more than two hundred feet below from end cap of your source well . 

  12. Use high pressure RO (SWRO) to get upto 85% recovery. Any further recovery of concentrate 15% will require evaporation.

  13. An assumption is you are using two stage (treating the concentrate from RO 1 with RO 2) not two pass (treating permeate from RO 1 with RO 2).  A few thoughts.  Depending on the feed chemistry and pretreatment before the first stage, you may be able to blend some of the second stage reject back to the feed of the first RO and increase your overall recovery.  Treatment of the second stage concentrate may be another option.  A Nano system may provide the overall quality of the permeate to send directly back to the feed for the first stage RO.  Running at high recovery may provide what you need.  Another option is a high pressure RO system to produce a product to feed to one of the stages depending on permeate quality.  In both cases some pretreatment may be required to reduce the fouling load identified in the above chemistry.