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الماء القلوي المتأينليس علاجاً ولا دواء ولكن وسيلة يابانية آمنة ومتطورة وفعالة لمعادلة وإزالة الفضلا
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101SV-UV USA - RO101SV-UV 5 stage Reverse Osmosis Water Purification System with Ultraviolet Sterilizer Specifications: Membrane: 80 GPD 302 LPD With a transformer, availabl
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Specifications: Production: 50 GPD 189 LPD Water storage tank: 2.2gallons 8.3 liters With a booster pump (optional): -Input in AC 110Volt, 220Volt or 240Volt (5060Hz). Operation

 
 

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Reverse Osmosis Questions---3  

  articleReverse Osmosis Questions---3

 

How does antiscalant work for a reverse osmosis water treatment application?


 

An antiscalant is a pretreatment injected into the feedwater before the feedwater enters the RO membranes. Its presence delays the reaction between calcium magnesium and bicarbonate. This results is scale not forming as the water is being purified by the RO. As the duration of the water in the membrane system is relatively short during the treatment, scale formation is prevented.


 

Can excessive Antiscalant foul the membranes?


 

 

Excessive antiscalant can cause fouling of the membrane.  This fouling can be cleaned by flushing the membranes with water at a pH of 2-3.



 

Antiscalant (organo-posphonate) and AM-88 (sodium meta-bisulphite for dechlorination) are sometimes both used for pretreatment.  In this case, is there any chemical reactions which would cause fouling of the membrane?

 

 

There is no chemical reaction between the two chemicals.


 


We are dosing a cationic coagulant before sand filter in our seawater desalination RO pretreatment system. Meanwhile, Flocon 260 (anionic) is dosed after sand filter. I wonder whether these two chemicals may react and result in fouling on RO membrane?

 

 

Flocon 260 is typically not compatible with cationic polymers.  If we knew the exact polymer you are using, we would be able to give a definite answer.  There are alternative Antiscalants that may be used (FLOCON 40), but in order to determine whether this will work, we will need a complete water analysis.  The FLOCON 40 does not offer much scale control for most of the 'sulfite' scales.


 

What is the dose rate and method of injection for Flocon antiscalant?

 

 

 

Dose Rate

The amount of Flocon required to inhibit scale formation depends on the degree of supersaturation of the insoluble salts at the point of highest concentration in the system.  The degree of supersaturation in turn depends on the concentration of the ionic species in the feedwater, the overall salinity of the feed, the temperature of the feedwater, the percentage of the feedwater recovered as permeate and the type of membrane used for the application.

 

 

FLOCON Solution    Concentration* %

Amount of Solution to be Injected per 1,000 Gallons  of Feed Water, In Gallons

3ppm

5 ppm

100

0.003

0.005

50

0.006

0.010

20

0.015

0.025

10

0.030

0.050

* Use soft water or RO permeate to mix with Flocon.

Dose Method

Flocon should be added to a membrane system prior to the final cartridge filter.  If media filtration or activated carbon is used, Flocon should be applied after these treatment stages.

 

Flocon should be delivered by dosing pump from a dilution tank, direct from the drum or from a bulk storage facility, into the feedwater at a rate that is determined by the size of the membrane system, the recommended dose rate and the delivery range of the dosing pump.  It is recommended that the dosing pump be adjusted by the stroke length, while maintaining stroke frequency at a high level as possible to achieve even distribution of the Flocon in the membrane system feedwater.

 

CAUTION  - Biological Activity:

Flocon contains a preservative that is effective up to a dilution of 1 part Flocon to 15 parts of system permeate water.  General periodic cleaning of the dosing system is recommended as part of the planned maintenance program.

   

 
 

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#1 author: minhaj (21 مارس 2011 00:13)

 

registration: -- | ICQ: |

seawater RO of 16000 GPD
( 1 FRP vessel of 600psi for 4 membranes)
  • membrane's vessel's inlet size and reject outlet size is of 1.5" dia. product line size is 1" in dia.
  • high pressure pump is of 5 cubic meter per hour, its inn and out is of 1.5" in dia.
  • feed pump is of 10 cubic meter per hour, its inn out is also of 1.5" in dia
  • distance between RO system and feed pump is about 20 meters with 11 bends.
  • there is a Sand Filter whose inlet & outlet size is 1" in dia, it is placed adjacent to RO system.
PROBLEM:
as i started the R O system, the flow meter of product water shows 11 GPM for 10 to 15 seconds and suddenly it decreased upto 6 GPM and product water hold at this point.not only the product but also the flowmeter of reject water also hold at 6 GPM. i tried so many to increase the product by controlling the rejecion valve, but it does not work.

So kindly tell me the solution, to gain the product water upto 10 to 15 GPM
also check it that either the line size of sand filter is too small according to the RO system or it must be replaced by 1.5" dia instead of 1" dia.

Hoping for quick reply.
thanks
     
 
 


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