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  1. DrLewinstein

    Oil usage in PD blower - where did it go?

    Thanks, Ashtree!
  2. DrLewinstein

    Oil usage in PD blower - where did it go?

    Hey, Team, Had a 40 hp PD blower lock down from lack of oil. Used 1.5 gallons of oil in 1 year. No evidence of leakage. Would a blower conceivably use 0.5 ounces of oil per day, sending it out with the air? There is a question of whether the blower was ever actually filled with oil, though...
  3. DrLewinstein

    Pump heads - Cast iron vs. Fabricated Steel Vertical Turbine pumps

    Thanks, gentlemen!
  4. DrLewinstein

    Pump heads - Cast iron vs. Fabricated Steel Vertical Turbine pumps

    Hi, gang! I am working on a WTP design including new High Service pumps. A former operator told the client that he should insist on cast iron pump heads, that fabricated steel ones would ultimately deform or flex and cause problems. Any thoughts? Thanks!
  5. DrLewinstein

    Removing Duckweed from a Clarifier

    We have a duckweed problem in a 70 ft clarifier. The clarifier is extremely underloaded - 50,000 gpd in a 70 ft clarifier. The flow is from a college student development and the plant is a former textile industry WWTP. The duckweed grew when the clarifier was pumped down for maintenance and...
  6. DrLewinstein

    Large Diameter PVC Solvent Glued Pipe for Sewer Service Lines

    I noticed on a set of plans that the engineer is calling for 8" PVC solvent welded pipe for an underground sewer service line for an industry. I confirmed that he meant this on purpose and asked him what the thinking was, since bell and spigot joints seem to be more common for this diameter. A...
  7. DrLewinstein

    Effluent Sand Filter Diffuser Whatizzit

    Thanks for your responses. The problem with the strainers is that they stop up. The way the plant is designed, if the filter is bypassed, the unfiltered effluent goes into the clearwell used for backwash, which introduces solids. Based on the design, the backwash water has to be really clean...
  8. DrLewinstein

    Effluent Sand Filter Diffuser Whatizzit

    The diffuser in the attached photo is part of an effluent sand filter. The filter has a filter plate into which the diffuser is attached so that the diffusers are the only means by which water can get from one side of the filter plate to the other. The sand and anthracite sit on the filter...
  9. DrLewinstein

    Choosing a WWTP technology for an Industrial Park

    Ben, thanks for the reply. We would require industries to pretreat to more or less domestic wastewater concentrations of BOD, TSS, ammonia and metals. Also, the bulk of the wastewater will likely be the domestic wastewater from the workers at the park. Given those things, it still would seem...
  10. DrLewinstein

    Choosing a WWTP technology for an Industrial Park

    I'm working on a feasibility study for a WWTP for an industrial park at 0.5 mgd. Any input on a good technology for taking on various industrial wastes. Stream discharge. Effluent limits 5BOD, 5 TSS, 0.5 summer ammonia, 0.5 TP. Thanks.
  11. DrLewinstein

    UV on Lagoon WWTP Discharge

    Thanks for responding, Semo. We are going to rent the transmissivity unit so we can observe it for several weeks. It is an aerated lagoon.
  12. DrLewinstein

    UV on Lagoon WWTP Discharge

    We are wanting to eliminate the usage of gaseous chlorine and sulfur dioxide at a 2.5 mgd lagoon WWTP. Are you aware of successful installations of UV for this application? What are the concerns? Any feasible alternatives? We will have a TSS limit of 45 mg/L.
  13. DrLewinstein

    Drainfield for Swimming Pool Backwash

    I am designing a drainfield that will receive backwash water from a resort area swimming pool - 300 gpm for 5 minutes twice a week. Other than buffering the flow into the drainfield, should anything else be done to treat the backwash water to remove solids? Are there enough solids to be a...
  14. DrLewinstein

    Proper OSHA labeling for Aluminum sulfate bulk tank

    I'm selecting safety signage for an alum bulk tank. Should the sign say, "Danger - alum", "Caution - Alum" or just "Alum"? Where are the standards for this? Thanks.
  15. DrLewinstein

    Jar testing for Oxidation of BOD/COD

    We are treating the wastewater from a process that is removing a coating off of "off-spec" plastic so that the plastic can be recycled. When the pH is dropped to about 3.5, about half of the BOD/COD comes out as a precipitant. The numbers I gave at first are after this step. We're trying to...
  16. DrLewinstein

    Jar testing for Oxidation of BOD/COD

    Hi, folks, I am going to be doing some jar testing to remove BOD/ COD from an industrial waste stream. BOD is about 1200 mg/L, COD 2000 mg/L. Need to knock this down to 300 mg/L BOD, 750 mg/L COD. Waste stream is small (5,000 gpd), so we're trying to avoid biological if possible. We're...
  17. DrLewinstein

    Alum addition for P removal

    We are working on a 1 mgd activated sludge plant that has a 6 month rolling average pound limit for phosphorus. No concentration limit. The plant presently meets this limit without P removal, but could in the future have to remove some P to meet compliance if flow increase. We plan to add...
  18. DrLewinstein

    Cryogenic Liquid Cylinder Perfomance "NER"

    Just a couple of thoughts... 1. This forum is for wastes and wastewater. You may want to put it on the mechanical engineering forum. 2. I could not tell from your explanation how the cylinder was configured, but I do remember from heat transfer class that there was a critical thickness of...
  19. DrLewinstein

    Phosphorus in Landfill Leachate and WWTP Sludge Dewatering Filtrate

    I'm trying to find out how much phophorus I might expect in landfill leachate and also in the water from dewatering sludge that comes from domestic package WWTPs. Any help or ideas? Thanks
  20. DrLewinstein

    Peroxide for Algae Control?

    I had never heard of the barley straw use for algae control. Here is an interesting article on it by Purdue. http://www.btny.purdue.edu/pubs/apm/apm-1-w.pdf

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