Large Size Desalination Plants

1. How are large sized desalination plants sized? especially keeping in mind plant availability & turn down ratios?
2. How to decided on number of 1st pass & 2 nd pass RO skids in the partial split 2 pass scenario?

Taxonomy

• Desalination
• Sea Water Desalinisation
• Desalination Pre-treatment
• Desalination Plant

8 Answers

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2. Good Morning Mr. Mansuri;

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3. The largest one that I was involved with is Jeddha Phase 3 (240,000 m3/d) in Saudi Arabia for SWCC.  Their requirements for 2nd pas RO is to limit the chloride level to 60 ppm.  So there were partial bypass of the main stream (1sp pass RO permeate) that was treated in the 2nd bypass and re-collected in a secondary tank. 

   2nd pass RO will also give you the flexibility to schedule maintenance on a large 1st pass RO on your time because the water treated in 2nd pass is going to always lower than 1st bypass RO.  If something to a 1st pass and there is no 2nd pass, you must investigate the source of the problem immediately and fix the unit right away. 

    

4. Each water treatment plant design is unique since the input and/or output quality are  unique. Plant capacity, water quality, legal conditions  and the weather conditions are considered while designing the plant. You may contact with your requirement for further details.

5. 1. Due to the modularity for desalination units there are no size constraints to be expected. Nearly to be considered a standard are actually seawater reverse osmosis (SWRO) desalination plants with a potable water production of about 100,000 to 200,000 m³/d, very few already even bigger, e. g. up to 500,000 m³/d.

   The costs per m³ can reach a range below one Euro in the meantime based on favorable local frame conditions, CAPEX and OPEX included.  

   HIgh plant availability and process reliability are fundamental rerquirements if the plants are well designed, manufactured and operated adequately. 

   2. As "each case is different", what I address as the "golden rule of chemical engineering", a general statement is not possible. Specification of the raw water and the requested quality of the permeate or potable water are basis for a related assessment, as especially the pre-treatment will influence related technological decisions.

   1 Comment

   1. hi, thank you for the post.  I was looking for help in running the RO projections.

6.  By how much money the unexpecting  public can be coned out of.  Not very helpful. But dead center true.

7. Moving water is most efficient by using propeller pumps for lifting

8. Why are you thinking about a second pass in an RO desal plant? Do you need extremely low TDS  >>100 mg/L?   Two pass was done in some locations when the WHO Guideline for boron was 0.5 mg/L so 1 pass was not sufficient. Now the Guideline is 2.4 mg/L which is easily achievable by 1 pass. For details on sizing and other issues contact Nikolay Voutchkov   nvoutchkov@water-g.com