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This construction site is located at the junction of Shangri-La and Lijiang. It is a large domestic breeding enterprise, Zhengbang Group. The purpose of this construction is that the biogas slurry tank will emit a lot of odor. Therefore, the treatment method is to cover a layer of geomembrane on the surface of the tank to prevent the odor from overflowing.
The entire ground area of the biogas slurry tank is 4000㎡. Therefore, to make a cover for it, it is necessary to weld a membrane material of more than 4000㎡. The only difficulty for construction is that there is still biogas slurry in the biogas slurry tank, so construction cannot be carried out inside the water tank. The method we adopted is to weld outside the site. There is just a 6.5M wide site around the biogas slurry tank, and our construction is carried out on this site.
For the covering of the biogas slurry tank, we usually use floating buckets to assist construction. And when laying, it is not completed by welding at one time and then dragging the whole sheet. Instead, weld one sheet and drag one sheet. Although this construction operation method is time-consuming, it can prevent the membrane material from being torn to the greatest extent.
The material used at this construction site is 1.5mm thick HDPE geomembrane. The total construction time is 11 days. The area used for biogas slurry at the bottom of the tank is 3650 square meters, and the cover of the biogas slurry tank is 3900 square meters, totaling 7550 square meters. Geomembrane as a covering layer is different from our usual construction. For this site, the bigger difficulty is that the membrane material needs to climb over the water tank wall about 2 meters high, which caused great trouble to the construction. Therefore, we also found a loader to provide a lot of assistance for the entire laying process. And there are not many construction personnel this time. Including welding technicians, the total number of personnel is 6.
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