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  1. wardens355

    RO Feed Piping Material Selection

    Thanks for the feedback. We have discussed potentially moving to FRP because it is a more robust material than PVC and is also corrosion-resistant. I would like to make sure that CS and DIP are poor options before wholly eliminating them. I agree that cartridge filters should be a fail safe...
  2. wardens355

    RO Feed Piping Material Selection

    There will be cartridge filters protecting the RO membranes, so maybe the concrete-lined pipe would not be as big of an issue. We probably need to look into surge analysis for closing butterfly valves on the greensand skid to make sure we will not risk exceeding pressure rating for FRP if we...
  3. wardens355

    RO Feed Piping Material Selection

    Size ranges from 6" to 20" from individual skid/vessel piping to headers.
  4. wardens355

    RO Feed Piping Material Selection

    I am involved in design of an RO drinking water plant and was curious if there are thoughts on piping material upstream of the RO system. We do not want to use PVC because greensand filtration is planned as pre-treatment, and there may be pressure surges associated with valves slamming shut...
  5. wardens355

    Denitrification of High-Strength Industrial WW

    The report listed ~7500 mg/L as nitrate, I converted to nitrate-N. If the plant wants to move forward I will keep a passive system in mind. 1700 mg/L NO3-N may be a touch high for a passive system to be practical, but I am not terribly familiar with passive systems for nitrate removal.
  6. wardens355

    Denitrification of High-Strength Industrial WW

    I am looking into biological treatment of wastewater produced at a coal plant. The plants produces 0.4 MGD wastewater with 1700 mg/L NO3-N and virtually no COD/BOD. This stream must be treated down to approximately 25 mg/L before being blended and released. My rough estimate for an anoxic...
  7. wardens355

    Oil/Water Separation - Choosing the right equipment

    I am working on a collection of commercial oilfield disposal sites and am diving in head first to the world of oil-water separation (OWS). The sites will have a truck wash, where recently emptied tankers and end-dump trucks with cutting wastes will wash off. The wastewater from the truck wash...
  8. wardens355

    Oil Water Separation - Choosing the Right Equipment

    I am working on a collection of commercial oilfield disposal sites and am diving in head first to the world of oil-water separation (OWS). The sites will have a truck wash, where recently emptied tankers and end-dump trucks with cutting wastes will wash off. The wastewater from the truck wash...
  9. wardens355

    Preventing Emulsification - Best Pumps

    I am looking at the 400-600 gpm range. A previous project used a rotary lobe pump at about 250 rpm for this flow range. An article I uncovered online indicated that disc pumps performed the best in terms of preventing emulsification. Seems like everyone has their own flavor for this.
  10. wardens355

    Preventing Emulsification - Best Pumps

    I am working on a project requiring pumps to transfer oily water to an oil water separator. What pump type provides the least amount of emulsification? Low RPM positive displacement seems ideal, but I'd like to get some feedback from people familiar with similar applications.
  11. wardens355

    Sulfate Removal - Puzzling Gypsum Addition

    I understand that the plant is producing a lot of gypsum during the SOx control, but the lab testing indicated that pure, reactant grade gypsum was required to get better removal of sulfate in the wastewater stream. The lab tests used both recycled gypsum sludge and lab grade gypsum, and only...
  12. wardens355

    Sulfate Removal - Puzzling Gypsum Addition

    A plant is considering adding lime, sodium aluminate, and gypsum to precipitate sulfate (CaSO4 - Gypsum!!!). They call the gypsum a seed source or precipitation enhancement agent, and seem to have pilot tests to show it works. I have no idea how adding the product that precipitates can aide in...
  13. wardens355

    Ammonia Stripping and Scrubbing

    Flue gas from coal power plant is going through desulphurization. I'm thinking that the stripped ammonia could be routed back to the desulphurization process and reused.
  14. wardens355

    Ammonia Stripping and Scrubbing

    I am looking for suppliers of ammonia stripping and scrubbing equipment for a flue gas desulphurization wastewater stream. The stream contains up to 300 mg/L ammonia and a lime process will elevate pH to >11.5 (all NH3 gas), effluent goal is <30 mg/L. Looking for both a stripping unit and a...
  15. wardens355

    Wetted Parts for Oil/Water Slurry

    We have told the client that we do not recommend cast iron (they are also using PVC piping - we also told them we do not recommend this). Even so, client is going with the cheaper materials and treat as a potential throwaway. The information is good to know for future projects however, thanks...
  16. wardens355

    Pump and Variable # of Operating Nozzles

    I am trying to find a good resource to start with for the design of a system with a pump skid feeding water to a collection of nozzles used for washing trucks. The system has 6 nozzles, 2 of one type, 4 of another. I need a starting point for the analysis of the system when any combination of...
  17. wardens355

    Wetted Parts for Oil/Water Slurry

    A truck wash down facility at an oil extraction operation is using rotary lobe pumps to move oil/water/silty slurry to an oil/water separator. The oil and chloride content is unknown since operations have not started yet, but there will be salty water used for wash down. Currently, the wetted...

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