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  1. mdszj

    Need vapor pressure test for organics in aqueous mixtures

    Siretb We regularly collect water samples and have them analyzed for VOC levels. We need to also measure vapor pressure because it it a permit requirement. thx
  2. mdszj

    Need vapor pressure test for organics in aqueous mixtures

    Hello I am trying to find a test method to determine the vapor pressure of organic compounds (such as toluene, xylenes, and ethylbenzene) in an aqueous solution. The application is at a pump and treat plant for treating contaminated groundwater at a Superfund site I am working on. The...
  3. mdszj

    Method for Calculation of Average pH

    Hello My question is regarding the proper method for calculating average pH. I just heard that the proper method for determining the average pH for a group of several pH measurements is: 1) Convert each pH measurement to its corresponding hydrogen ion concentration (i.e pH = -log [H+]) 2)...
  4. mdszj

    Resistance of PVC to BCEE

    I have been trying to get data on the chemical resistance of PVC piping to an organic chemical called bis(2-chloroethyl) ether (BCEE), CAS no. 111-44-4. This info is not on any of the resistance charts I have seen. Any info is appreciated.
  5. mdszj

    VOC Evaporation

    If you can do treatability tests you may be able to take batches of the soil and aerate the batches at a given flow rate for varying amounts of time (for example, x cfm/unit soil for 1 day, 2 days, etc) or at varying rates for a given amount of time (example, x cfm/unit soil, 2x cfm/unit soil...
  6. mdszj

    Lysimeters

    Hello all I have a project in which I am evaluating the effects of adding limestone to the surface of a large area (over 100 acres) of stored river/canal dredge material. After applying the limestone, it is then disked into the soil. The objective is to determine whether adding the limestone...
  7. mdszj

    Anionic floculant

    ANother company that sells flocculants is Betz. Also - many of the vendors will do jar tests for little or no cost to help you determine which polymer works best for your application.
  8. mdszj

    Time required for Iron oxidation

    Semo Thanks for the info. I agree about the Ca - we just got water sample results back from samples I collected at various points throughout the system. When the pH was raised to 10, the soluble Ca was reduced from ~28 mg/L to about 17 mg/L. The Ca must have precipitated out. Additionally...
  9. mdszj

    Time required for Iron oxidation

    Hello all While doing a net search on iron oxidation and removal for a groundwater pump/treat application I am working on, I came across this thread. After reading it I have a couple questions, since I am also trying to optimize Fe removal in my application. 1) From the thread above, sounds...
  10. mdszj

    On-Line Arsenic Monitor for Water Stream

    I am working on a pump and treat project to remove arsenic from groundwater. We are interested in monitoring the arsenic concentration in the treated effluent on a continuous basis using an on-line type of instrument. The intent is to have the monitor send a notification or alarm if the...
  11. mdszj

    BCEE (bis-2-chloroethyl ether) treatment

    hello Bkmorange Thanks for the info on oxidation of BCEE in situ, sorry I did not get on this site sooner to see your reply. By any chance do you think it would be possible to get access to the case info/data you mentioned, or at least part of it, or a sanitized version? I am interested in...
  12. mdszj

    BCEE (bis-2-chloroethyl ether) treatment

    I am trying to track down any info or case histories on whether BCEE can be treated in-situ using oxidation by ozone, peroxide, or any other method. This material is a partially water soluble contaminant at a landfill site I am working on. I have already had lit searches done with little...
  13. mdszj

    Disinfection of Pseudomonas bacteria

    Hello, I am looking for any info or case histories of disinfecting pipes and wells that have growth of Pseudomonas bacteria. I am working on a project involving a remediation groundwater pump and treat system. The treated water is then re-injected into the subsurface by using injection wells...
  14. mdszj

    Disposal of tetramethyl ammonium chloride

    Before you dispose large quantities of this material (not sure how much you have) at a POTW you should check to make sure they can handle it without having a negative impact on their system. This is a cationic surfactant, which can be used as a biocide. If the POTW uses any bio treatment...
  15. mdszj

    concrete recycling

    I am working on a demo project in New Jersey that includes disposal of 4,000 tons of old concrete. My choices for disposal were: 1. recycling it to be used in roadbeds, etc. (cost of up to approx $5/ton depending on whether it has rebar); and 2) disposing as waste in a landfill (cost approx...
  16. mdszj

    Cause of Well pump corrosion

    Unfortunately that is pretty much all the info I have at this point. I am planning to check the water for chloride and other anions as well as metals and pH. I also have no info on bio in the wells but I know that in the area of eastern PA(Tranguch, PA) there are projeects that have problems...
  17. mdszj

    Cause of Well pump corrosion

    I have an application in which a well pump is being severely corroded. I am trying to find out how to determine whether the corrosion is caused by an electrical problem of some kind, and also find out what I can do to solve this problem, like use a sacrificial anode, etc. ANy info is appreciated.

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