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  1. ekolog16

    Iron Sequestration in Groundwater Treatment System

    I'm supporting a groundwater treatment system that has problematic fouling. It's about a 10 gpm system from a french drain that pumps shallow groundwater through bag filters and then two 500-lb activated carbon filters to remove BTEX (~1 ppm total). It's to prevent contamination to a small river...
  2. ekolog16

    Zero Pressure Drop vs. Time in Monitoring Well. What does it tell me?

    What are the characteristics of the extraction well (screen length in vadose zone, diameter, vacuum during test)? Pilot tests can help you determine air permeability and thus the radius of influence (which depends on how you define it). The Army Corps manual has provides input on the theoretical...
  3. ekolog16

    Water System Design (Well) for Commercial Bathroom

    You may want to check out some work Colorado State has been doing with engineering firms on sustainable rest areas in rural/remote areas. http://www.colostate-pueblo.edu/Communications/Media/PressReleases/2011/Pages/05-18-2011.aspx
  4. ekolog16

    leaching hexavalent chromium from concrete debris

    I've used calcium polysulfide before for hexavalent chromium reduction in water. The reduction works very well by mixing it at about 5% solution. Dealing with the hydrogen sulfide generated made things difficult however. You can consider using ferrous sulfate as bimr talks about or a safer...
  5. ekolog16

    Treatment Plant Tank Collapse

    Okay I see now, there were differing reports on the tank dimensions. It looks like it was a 1 MG tank. Still, I'm sorry to the workers' families. Unfortunate they were below it at the time.
  6. ekolog16

    Treatment Plant Tank Collapse

    The structurals were also talking about the rebar. Another article I read says this portion of the tank was built in 1996 and has had some issues. http://www.knoxnews.com/news/2011/apr/08/cause-basin-collapse-gatlingburg-wastewater-plant/ Why did they build a ~2.0MG rectangular equalization...
  7. ekolog16

    measuring interface free phase/water in monitoring wells

    I've never come across a datalogger that can measure the interface. Have you called Solinst or In-Situ? I suppose you could place two floats with logging capabilities in the well, one for the hydrocarbon and one for water. http://www.levelcontrols.com/index.html Are these 4-in wells? Have you...
  8. ekolog16

    pipeline elongation

    http://www.karasus.com/kompansatorsabitnoktalarvekilavuzlamaeng.html
  9. ekolog16

    I want to promote Scale Buildup in pipes and pumps

    I'm interested in how this experiment might work for pumps. Would the inlet and outlet pipes of the pump foul before the pump itself (since higher velocity and shear stress reduce fouling)? In fouling applications in P&T systems I've seen, the pump efficiency is affected by the increased head...
  10. ekolog16

    I want to promote Scale Buildup in pipes and pumps

    Read up on scaling and fouling and then do the opposite. http://www.jaeger.com/1996foul.htm http://www.watertreatmentguide.com/membrane_fouling_solutions.htm Calcium sulfate (CaSO4) or calcium carbonate (CaCO3) may be good salts to start (>1000 ppm). As for adjusting pH for these particular...
  11. ekolog16

    River Water Quality

    I think filterable means the sample is filtered and then the mass of solids is determined after evaporating a certain volume of water. http://www.hach.com/fmmimghach?/CODE:DOC316.53.0124615783|1
  12. ekolog16

    River Water Quality

    zdas04, Sorry about that, the numbers for TDS/TSS I posted I'd read wrong. In 7/09 in the Vardar: TDS (Total Filterable Residue) was 365 mg/L TSS (Total Non-Filterable Residue) was 385 mg/L. Please ignore the previous TDS and TSS values. ekolog
  13. ekolog16

    River Water Quality

    The Vardar River in Skopje measured in July 2009 was: Temp = 18.4 deg C pH=7.11 NO3= 0.287 NH3=2.416 mg/L Turbidity = 7.5 NTU TSS=20 mg/L TDS= 8 mg/L BOD= 7.95 mg/L O2 DO=4.07 mg/L No flow data, but average flow in 7/2008 was 11 m3/sec (or 228 MGD)...
  14. ekolog16

    Work / Life Balance

    Don't worry peterso2, a lot of us have been in your boat before. We engineers get so committed to our work life we can't see the forest through the trees. One of the first ways to meet people are in professional organizations (ASME, EWB-USA etc) since you'll already have some common ground...
  15. ekolog16

    Career switch to different field

    I've been working for several years in environmental consulting, mostly site characterization and remediation. I have a BS in ChE and MS in EnvE and I enjoy the work but I feel the engineering is marginal and am uncertain of the outlook (fewer contaminated sites). I want to switch to...
  16. ekolog16

    Borehole Treatment for Potable Supply

    Pearse29, Not as many people replied to this as I thought. I was interested in hearing other opinions on GAC for this application. Out of curiosity what were the VOCs identified by your lab? Here's a potentially relevant article from USGS...
  17. ekolog16

    Borehole Treatment for Potable Supply

    bimr - This may be a good post for the "soil/groundwater environmental engineering" forum. This is a common problem. GAC should be able to remove most VOCs from your wells, your vendor should be able to assist you with sizing the carbon vessels and also sizing the carbon to figure out the...

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