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  • Users: sewerfix
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  1. sewerfix

    Biosolids Sliding Frame Silos

    We're looking at biosolids storage silos for 23% aerobically digested WAS. If anyone has practical experience with sliding frame (push floor) silos can they comment on their effectiveness, does the product deteriorate through the mechanical workings of the outloading system etc. Thanks Andrew
  2. sewerfix

    Digester Struvite Control Strategies

    Does anyone have practicall, working knowledge of struvite control strategies. I know of ferric being used to lower ph, reducing precipitation potential to bind with phosphate and remove it from solution before struvite can form. I've heard that aluminium salts are more effective then iron. I'm...
  3. sewerfix

    Digester Gas Flow Switch

    I'm looking for a flow switch to be mounted downstream of existing gas compressors to confirm operation / detect failure. I'm reluctant to use a thermal flow switch because of possibility of grease build up etc. The pipe is 2" steel Can anyone suggest a reliable instrument?
  4. sewerfix

    Polyurethane Valve Seats

    What are the pros and cons in using knife gate valves with polyurethane seats for municipal sludge applications. Obviously the suppliers talk about abrasion resistance, however I'm just curious if there are any negative aspects such as not being able to achieve a positive seal where foriegn...
  5. sewerfix

    Pipeline Pigging

    Does anyone have experience with pigging of municipal sludge pipelines? in particular the use of welded bars in tee braches to stop pigs catching etc. I'm concerned about the buildup of sludge / rags on such bars being a source of high maintenance. Are there other tricks to ensure a foam pig...
  6. sewerfix

    Municipal Sludge Tank Mixing

    I'm looking for a tank mixing tank system suitable for a solids content of between 4- 7% w/w solids content. We have two sludge stream coming into a blend tank and the mixing system should blend and keep the solids in suspension before being processed through our new sludge thickening facility...
  7. sewerfix

    Municipal Sludge Reflux Valve

    Can anyone recommend a reflux (non-return) valve suitable for municipal sludge applications approx 5% solids? We have had very limited success with full bore swing check valves having resilient seats. I didn't know if the slurry pumping industry used something unique for solids laden fluid...
  8. sewerfix

    Slusge Density Meter

    I'm looking for a non-contact density meter to monitor solids content of a 3 - 8% municipal sludge application. We have nuclear density meters onsite and the problem is that they require constant cleaning, making the instrument unreliable. The thickened primary sludge periodically creates a...
  9. sewerfix

    DC Motor Replacement with AC

    We have a centrifugal pump that is powered by a 675kW DC motor (two speed) which we want to replace with AC motor and AC-VSD control. Is it as simple as requiring a 675kW AC motor ? Are there other factors , derating factors to consider in relation to the starting characteristics of AC versus DC...
  10. sewerfix

    Screw Conveyors

    General Question What would the selection criteria for using shaft versus shaftless screw conveyors? Are there any major advantages of one over the other?
  11. sewerfix

    Odour dosing in sewers

    Just a general question, where chemical dosing is used to control odours in the sewer, where is it dosed and how is it flow proportional. I have seen a dosing facility at a pump station where Ferric Chloride is drip fed into the collecting manhole outside the station. Just wanted to here about...
  12. sewerfix

    Cast Iron / Ductile Iron Welding

    Can anyone tell me if CICL and DICL can be welded, and compatible with stainless steel. I've got a DN450 CICL pipe in a very tight chamber and want to put a DN250 branch on it. Can I weld stainless to CastIron. Thanks

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