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...
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...
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
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...
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.
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...
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...
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...
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...
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
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
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)...
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...
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...
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...
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...
