Covering geomembrane is a very important part of landfills, its main purpose is to control diseases, flying garbage, odor, improve road traffic, and improve the landscape. disease control. Reduce mosquito habitat and prevent solid waste from becoming a site for various harmful organisms. Prevent fires in landfill piles, or reduce the likelihood of fire spreading. Anti-scattering control helps control lightweight waste. Odor control can become an odor barrier and control the odor of solid waste. beautify environment.
The landfill operation area should be covered on time according to the different stages of the landfill, and daily coverage, intermediate coverage, and final coverage should be achieved.
The thickness of daily coverage or periodic coverage should meet the standard
The daily coverage of the landfill can be covered with materials such as soil, HDPE geomembrane, plastic-impregnated cloth, or rain cloth. Soil cover should be used, and the cover thickness should be 20-25cm; the daily cover on the slope should be covered with film or cloth. When other bulk materials are used as covering substitutes, the covering thickness should be determined with reference to the covering thickness and performance requirements of the soil.
The intermediate covering should be covered with HDPE geomembrane or LLDPE geomembrane with a thickness of not less than 0.5mm, and clay can also be used, and meet the following requirements: When using HDPE geomembrane and other materials for intermediate covering, an effective gas guide should be used. Check the effective overlap between the covering and the rainwater side ditch, and leave the slope of the rainwater flowing to the side ditch along the slope direction.
The selection of geomembrane covering materials should meet the following requirements:
The cover film should be a black HDPE geomembrane with a thickness of 0.5mm or more and a width of more than 6m or a bentonite waterproof blanket (GCL) with a thickness of more than 5mm. HDPE geomembrane can also be used for daily cover.
The cutting length of the geomembrane film should be about 20m during daily mulching, and the length of the geomembrane should be cut according to actual needs during intermediate mulching, and should not exceed 50m.
After the unit-level garbage is landfilled, the rain and sewage diversion facilities should be kept intact.
To control the odor in the operation area of the landfill, measures should be taken to reduce, control, and timely cover the exposed surface of garbage, close the leachate change tank, improve the collection rate of landfill gas, remove the accumulated water in the plant area in time, and kill the operation surface in time.
daily temporary coverage
The landfill area that needs to be refilled within 7 days should be covered with 0.5mm thick HDPE geomembrane or materials of the same strength.
Coverage time requirements: One hour before the end of the film laying class, the operation area must be reduced to less than half of the daily operation area. After the completion of the landfill task on the day, the on-site operation area of the day will be covered, and no garbage can be seen on the site.
Requirements for the time of uncovering the film: the time for uncovering the film every morning will not be earlier than half an hour before the operation. The covering material of the planned landfill area will be opened before the domestic waste enters the site. The coverage area of each independent landfill operation surface will be controlled within each Below the daily work area.
Covering technical requirements: Ensure that the HDPE geomembrane is lapped, the lap width is 100~120mm, and the lap joint should be lapped along the water; after the HDPE geomembrane is covered, it should be well pressed with cement bricks or car tires to prevent The wind blows away, and the distance between the pressing blocks should not be greater than 2000mm.
mid-term coverage
For the landfill area that will no longer be landfilled for more than 7 days, the covering should be welded and overlapped with HDPE geomembrane with a thickness of more than 1.0mm or a membrane of the same strength material. After the HDPE geomembrane is covered, it should be pressed with cement square bricks or car tires to prevent it from being blown away by the wind. The distance between the briquettes should not be greater than 2000mm. On the slope, use plastic ropes or geomembrane strips to connect the briquettes to weld the briquettes. As a stabilization measure, special personnel is arranged to inspect during the day to check whether there are any problems such as HDPE geomembrane damage, displacement of the pressing block, etc. If there is any problem, it should be repaired in time.
Arrange the working time of the landfill to ensure the coverage rate and shorten the time for odor diffusion during the landfill operation. The operation period should be shortened as much as possible, and the garbage should be arranged to enter the site during the concentrated period. Under normal circumstances, landfill operations can be arranged from 6:00 to 18:00 every day, and the entire landfill reservoir area will be covered during other hours.
Efforts to control and reduce the work area
The daily operation area should be controlled according to the daily amount of incoming garbage and the thickness of the landfill. The area of film uncovering every day will not be larger than the daily control area, and the film uncovering work will be carried out in coordination with the progress of the landfill so that the cover will be uncovered while the landfill is being filled.
In daily coverage, it is necessary to reduce the working surface to less than half of the daily control area one hour before the end of the workday. After the completion of the landfill task on the day, the on-site working surface on the day should be covered and sealed.
If you have a landfill liners project under construction or planning, as a manufacturer and supplier of geomembranes for landfills for more than 20 years, you can contact us, and we will provide a professional one for your landfill project. stand-alone solution. Or give you a free landfill geomembrane sample!
