How to construct a water tight and gas proof enclosure in a highly contaminated area safely?

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Dear Friends,

We are going to built a 20 m inside diameter and 13 m deep enclosure using secant pile system/caissons to construct a sewage pumping station in a highly contaminated area. Presence of toxic gases such as methane, Hydrogen sulphide etc combined with water/oil are expected from the surrounding soil. In order to arrest the flow of gases combined with water to the excavations we need your advise to adopt a suitable technique. Did anyone have any options other than secant piling and well point system  to be used for safe enclosure to construct a sewage pumping station inside? The enclosure should be water tight and gas proof. The  Project is a sewerage network project in Bahrain and the pump station is to be constructed in a highly contaminated Bay area. Land reclamation works has already commenced. We have sent inquiries to several specialists in this field and waiting for their feed back now.

Please share  your ideas with me.

Regards,

Davis

Project Manager

JASCO, Bahrain

Mob: 00973 39212572

Email:akdavis71@yahoo.com

 

 

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14 Answers

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  2. Convert the waste into resources

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  4. Hi Davis , I understand the problem facing by you ,you need the caisson well water tight as well as as proof make the construction to sustain the earht pressure and surrounding water logging thrust. My advice to you that start the process or work in link methods. 1] first do the precast for the caisson well in various number for a height not more than 1.0 mt . 2] Do the excavation and pumping in simultaneously ,so as to put the members of precast caisson well and fixing it in joint make the joint water and gas tight by silicon or PVC fluid. 3] while excavation work and arrangement of precast member put multiple no of oxygen cylinders and exhaust system so as make feasible to circulate the oxyegen as well to remove the foul gases. 4] In the mean time after every four hours change the shift of labour teams alloted for precast fixing members , excavation ,pumping and concealing the precast . 5] It will take time but the target needs to achieve can be done in very perfect manner and without any accident or casualties. If needs more guidance you can mail me also. sanjay.chandne@yahoo.com

  5. hello following identical problems on a micro station of 5m3 we durtant two years made of the studies and research to find a solution. all described actions Ci above were undertaken: the results of biological examination danalyse montraitent a degradation of the medium permanently. by one contributes of circumstance which holds in our protocol of Biological Cleansing we found the SOLUTION. simple but completely effective since for now 6 years the experiment has been continued without any problem. All the described palliative solutions do not bring anything to see certaiens amplify the problem.

  6. During excavation and construction, apply force air ventilation enough to reduce LEL and other undesirable gases(use gas analyzer to monitor such- you should be aware of the displacement principle).Make a gas analyzer available at all time so it will alarm once the gas increases, the workers then temporarily vacate will the Air displaces the undesirable gases. Forced-air ventilator must be on-line towards the excavation. Once the gas analyzer stops the alarm, its a signal that the gas again is low and is safe to work. On the materials of construction, 20 m diamter x 13 m deep. The thickness as I recommend will be 12 to 20 inches made of concrete( class A mix )with 4 quadrant (a post on top and bottom- 4 lines crossing the center). On the inner diameter to be constructed with CPVC plate - 1/4" thick. All connecting lines should be welded well of same CPVC material. The purpose of the concrete posts crossing the center and the solid concrete is to ensure that your well can hold such huge weight of a waste( you are dealing with appx. 1500MT weight of wastes). The CPVC is both protecting the concrete from erossion by the waste quality and leach from outside cant penetrate towards the well. I hope I help. Edwin

  7. In this case that you subject to our opinion a thing arises: putrefaction. that Ci comes from a Biological dysfunction. is it with the source of the emission of waste waters, is it in the storage of waste waters, the waste waters are they composed of chemical pollutant which accentuate the phenomenon of putrefaction? you will never find solution with the putrefaction by a technical idea quite to the contrary that increases it. the main feature of the biological Cleansing it is the safeguarding of the biological state in permanent AEROBIC medium. a fall of the Aerobe involves a biological dysfunction systematically and directs the effluent towards the methanisation which it amplifies it still more quickly. Cdt

  8. Health & Safety Plan

    Davis,

    You are probably already addressing this but you should have an  Health & Safety Plan and on-site health and safety officer with continuous monitoring of potentially dangerous levels of gases, like methane and hydrogen sulfide (multi-RAE instrument).  You should also considering ventilating the area continuously with an air flow - be careful to minimize risk of explosion.  In short, you really should have a Health & Safety plan that addresses potential risks and protective measures. 

    Sincerely,

    Emery

  9. Glad to be of some help. Best of luck.

  10. Special thickness polyethylene covering material or special impenetrable preventative linings and then using of specially formulated cementing material, which may include bentonite slurry timed to set at specific time duration perhaps could be an acceptable option. An alternative could be to conduct a mini-research on doing same using various construction available cementation materials or sealants. But put into consideration, the depth, pressure and temperature of the environment in question. These factors are also important when dealing with gas/methane and even contaminants.

  11. Davis, I am neither a structural nor a civil engineer, but the secant pile wall system seems like a viable solution and limiting exposure to contaminants may come down to the actual construction sequence with proper Personal Protection Equipment (PPE). Another option may be a "Tilt-up" sytem where walls are poured like slabs on site close to final destination and then craned into place. In this case, a water proofing liner could be installed or applied while the wall is horizontal with the edges being sealed once in place. Just a thought.

  12. Hi Ubaldo, my main worry is whether the bentonite screen can prevent completely the flow of water and gases to the pit of dia 20m and 13 m deep. Conventional steel sheets & frame shoring to resist the earth pressure along with bentonite screen will be more costlier than a secant pile system?

  14. Hi Davis. If I may ask a question, are you seeking to prevent contamination during constructuon of the structure, post construction, or both? Also, I am assuming your using concrete for the construction of the structure. Have you consulted with your supplier to get suggestions from them? We have several ways to arrest leakage by using certain admixtures and cementitious constituents in the mix. Most suppliers work well to come up with ways to meet the project's performance needs. Feel free to contact me if they are not responsive.