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  • Users: Watro
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  1. Watro

    Dosing Sodium Hypochlorite in Raw Municipal Sewage

    The discharge to marine environment criteria require 0.5 mg/l of FRC Thank you Martin and Ash Best Regards NM
  2. Watro

    Dosing Sodium Hypochlorite in Raw Municipal Sewage

    In fact, the idea is to discharge the sewage from an offshore deck directly in to Sea by just disinfecting them. (Apologies, I missed to add this data) I agree, there are several consumers of Hypo, but would like to know if there is any way to estimate them. The HYPO will generated on site, so...
  3. Watro

    Dosing Sodium Hypochlorite in Raw Municipal Sewage

    Hello Peers, We are working on a project and need some clarity. What will be the dosage rate of NaOCl if this is injected in raw sewage to maintain a free residual chlorine of 0.5 mg/l. Injection directly in to an ATM tank with a retention of 1 hour. I believe ammonia will consume some hypo...
  4. Watro

    Iron and H2S removal

    Thank you Ash
  5. Watro

    Iron and H2S removal

    Thank you again. Lab tests possibility are limited WRT the site location and present project status Please advise if below sequence make any sense. Hypo (dosage only for Iron to Ferric) -> Bag filter -> Ultra Filtration -> Break tank -> Feed pump -> Air stripper (2 stages) -> RO Feed pump ->...
  6. Watro

    Iron and H2S removal

    Thank you Ash for your detailed post I believe then stripping should be upstream prior to Iron oxidation. We may add additional scrubber to get rid of the H2S odors removed from stripper. Strippers will preferably be 2 stage for complete removal. Followed by Iron oxidation Thank you Niss
  7. Watro

    Iron and H2S removal

    Hellow Gents We are designing a Brackish water RO plant, feed water from wells. Flow rate is 300 gpm The feed water has an Iron 5 ppm, H2S ~50 ppm. pH is 6.8, TDS is ~13,000 ppm, Temp: 25 - 36 deg C Can we oxidize the Iron completely with NaOCl, then acidify to air strip H2S Other downstream...
  8. Watro

    Pumice Media Performance

    Gentlemen, We have plans to use Pumice Media as filtration media instead of Sand for cooling tower applications These media manufacturer claim to deliver <1 micron of particle size, feed particle size vary from 50 - 150 micron, with TSS of 5 - 10 ppm Feed Flow rate is 750 m3/hr Do you have...
  9. Watro

    Carbon filter backwash with RO brine

    Thank you Gentlemen
  10. Watro

    Carbon filter backwash with RO brine

    Anyone please advise if an Activated Carbon filter be back washed with RO brine? The purpose of ACF is to remove traces of free chlorine and any organics present in the feed sea water, flow rate is ~900 m3/hr Multimedia filter present upstream of ACF and equipment all together are part of a...
  11. Watro

    Horizontal Carbon Filter

    Than You Ash You are right. It is part of pre-treatment for SWRO and feed seawater is chlorinated and pre-filtered with media filters Down the line micron cartridge filters are present. Do you know any suppliers who design such Horizontal systems? Or Any reference installation with higher flow...
  12. Watro

    Horizontal Carbon Filter

    Hi, Please advise if Horizontal Activated Carbon Filter has equal performance compared to Vertical ones. We have high flow rate in the range of 900 m3/hr of Seawater. Feed SW has free chlorine and organics as well Please highlight if this is technically possible Pros and cons, past exp and...
  13. Watro

    CPI Separator Design Assistance

    Ash We need to design a system for 50 m3/hr with a feed oil of 150 mg/l, 100 mg/l TSS with an oil droplet size of 30 micron and above. Removal of oil should be >90%. I am looking for design guidelines or simple spread sheet to see the basic sizes of the tank, required plate pack, pack volume
  14. Watro

    CPI Separator Design Assistance

    We are on task to review and FEED design a CPI separator and require design assistance in terms basic design guidelines or with spread sheet Regards NM
  15. Watro

    Chemicals for pH correction

    Hi Ash The plant is for an existing power plant and they are using Ammonium Hydroxide for boiler feed. pH to be raised from 6.5 to 9. All other condensate parameters viz; Na, Cl, SO4 will be less than 5 ppb Unit in MicroS/cm
  16. Watro

    Chemicals for pH correction

    We are working on a Condensate polisher unit and require pH correction system at the outlet to raise pH up to 9.0 from 6.5 The conductivity at the outlet of CPU unit is <0.1 mS/cm What are the typical chemicals used for pH correction. Is ammonium hydroxide an option? What is the Commodity...
  17. Watro

    pH correction for Condensate Polisher

    It is operating temp @55 deg C, the pH range is 6.5 - 8, while the correction system to be designed for a basis of 6.5 to raise it to 9 Every CPU system based on reducing conductivity, silica, Na, Cl and pH always near neutral at the outlet. Here it is 0.1 mS/cm cond.
  18. Watro

    pH correction for Condensate Polisher

    Thank you Sen, I don't think NaOH or Sodium based chemicals are dosed due to the Na load add on to the boiler feed water. Regards NM
  19. Watro

    pH correction for Condensate Polisher

    We are working on a Condensate polisher unit and require pH correction system at the outlet to raise pH up to 9.0 from 6.5 What are the typical chemicals used for pH correction. Is ammonium hydroxide an option? What is the Commodity chemical name, typical concentration, dosing concentration...
  20. Watro

    Low concentration SBS dosage

    Thank you Bimr and Ash, May I know your names and the companies you are working for? Please let me know, if that is allowed in this forum

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