Biogas & Gas Capture

Service : PT. Geostructure Dynamics give you solution for Gas Capture with Geomembrane Floating Cover.

Anaerobic digestion is a process where microorganisms break down biodegradable material in the absence of oxygen. This process is used widely to treat wastewater sludges and organic waste because it provides volume and mass reduction of the input material. The biological breakdown of organic matter in the absence of oxygen produces primarily methane, but also carbon dioxide and some traces of hydrogen sulfide, which altogether is labeled biogas. Although biogas-derived methane and carbon dioxide come from an organic source with a short carbon cycle, they do still contribute to increasing atmospheric greenhouse gas concentrations. This is diminished, however, when biogas is combusted. This energy release allows usage of biogas as a fuel to run any type of heat engine or to generate mechanical or electrical power. In essence, anaerobic digestion is a renewable energy source that converts wastewater to a methane- and carbon-dioxide-rich biogas suitable for energy production, replacing fossil fuels.

The geomembrane cover lays on the surface of the bioreactor, which provides buoyancy for the cover system. The cover works under a vacuum, and it uses a blower system that keeps the gases withdrawn and suctioned underneath the cover.

The Sequence of Geomembrane Floating Cover Installation :

The sequence of Geomembrane Floating Cover installation will be as directed by the Project Engineer and/or specifications in conjunction with all “as-built” drawings and logs. Geomembrane Floating Cover construction  will go to maximum allowable or until refusal as defined in the specs and logs.

Method of Geomembrane Floating Cover Installation :

  1. Earthwork

    • Surface  Preparation

      The surface to be lined has been prepared so as to be free of irregularities, protrusions, vegetation, excessive water, loose soil or abrupt changes in grade. The supporting surface does not contain stone or other matter of such composition, shape or size which may be damaging to the geomembrane. There are no excessively soft surface areas.

      Under no circumstances shall the installer deploy any geomembrane in areas not acceptable within these guidelines . A completed surface acceptance form shall be provided to the customer specifically indicating the areas accepted for geomembrane installation during each day’s activities. This form shall be provided after installation activities within that area. If at any time during the installation of the geosynthetic lining system the prepared sub-grade deteriorates, becomes damaged, or in any way is determined unacceptable by the Site Supervisor, all liner installation work shall stop in those areas and the condition of those areas brought to the attention of the appropriate party.

    • Anchor Trench

      The Anchor trench shall be constructed by the Earthwork Contractor (unless otherwise specified in the contract) to the lines, widths and depths as shown on the drawings and specifications. This task should be performed prior to the geomembrane deployment.

      The edges where the geosynthetics enter the trench should be free of irregularities, protrusions, etc. to avoid potential damage to the material. Backfilling of the anchor trench shall be the responsibility of the Earthwork Contractor in accordance with specifications. Backfilling should occur when the geosynthetic material is at its most contracted state to avoid damaging the geosynthetics during backfilling.

  2. Geomembrane  Deployment

    Deployment provided that i.e. deployment equipment does not damage the subgrade.

    Field panel placement installation sequence should take into account site drainage, wind direction, subgrade surface, access to the site, and production schedule of the project. Geomembrane panel deployment shall not proceed when adverse weather conditions exist which may jeopardize the integrity of the liner installation. Field panels should be seamed as soon as possible after deployment and all deployed material shall be marked with appropriate identification.

  3. Field  Seaming

    Field seaming involves the bonding of adjacent panels using thermal methods. In general, seams shall be oriented parallel to the direction of maximum slope, i.e. oriented along, not across, the slope. In corners and odd-shaped geometric locations, the number of seams should be minimized. No horizontal seams should occur on a panel less than one meter and fifty five centimeter from the toe of the slope. On slopes of less than 10 % (6L : 1H), this rule shall not apply. A cross slope seam may be utilized provided the panel ends are cut at an angle of approximately 45°.

    A seam is considered a separate entity if it is the principal attachment that joints two or more panels. Repairs are not considered seams in this context.

    A numbering system using adjacent panel numbers shall identify each seam.

    Liner installation can proceed in any temperature where it can be demonstrated by qualification weld that welding criteria can be met. Do not install in the presence of winds above or in weather conditions that may be detrimental to function of the cover. Do not weld membrane during precipitation or in the presence of excessive moisture or when conditions may affect the safety of the installation.

  4. Fill Pond with Water

    The water level in the pond will be within its operating range prior to floating the cover over the pond.

  5. Cover Geomembrane Panels Installation

    A suitable laydown area will be cleared next to the pond for staging cover geomembrane panels. This laydown area needs to be large enough to layout cover geomembrane panels and weld them together. Ensure surfaces in the pond and in the laydown area are smooth, free of foreign and organic material, sharp objects, or debris of any kind. Ensure anchor trench is complete and ready for installation. Check that pond liquid level is within required operating levels. Attach ropes/cables to pull harness on the cover. Float cover over pond. Adjust cover to operating level. Secure cover in anchor trench and backfill immediately. Adjust cover to site conditions.
  6. Cover Weight & Rainwater collection system Installation

    Place ballast weights. Install rainwater collection system. The action of accumulated rainwater and wind can play havoc on the longevity of cover systems and the degree of maintenance required. The cover installed of weights, floats, and self-regulating gravity drains that allow passage of rainwater into the liquid below. There are no folds in the design for collection of rainwater, and since there are no folds, there are fewer wear areas in the cover that require periodic maintenance.
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