|PRODUCT||JUNIFOL PELLD 1,0 G/G||135 000 m2|
The Marijampole landfill was established in the early 1970’s and from that time the waste was being continuously deposited there. The landfill site is located 12 km east of the town Marijampole (47.000 inhabitants, 7th largest city in the country), near the Marijampole – Vilnius road.
The landfill was constructed in two phases and the overall area of the site is currently 13,5 ha. The first phase covers an area of 4,5 ha, it is located at the northern part of the site and depositing started there in 1972. The second phase is located at the southern end, covers an area of 9 ha and it had been in operation from 1985 till 2008, when the landfill reached its full capacity. The total volume of deposited waste is 1,7 million tons. The landfill height variesfrom 3,5 m to 8,0 m.
Prior to the construction of the landfill site, the land was used for agricultural purposes (at present, it is still surrounded by arable agricultural land). The landfill was classified as “non-hazardous” and intended for municipal, biodegradable and mixed construction and demolition waste. But it is possible some hazardous waste may have been deposited there during the older firstphase.
When both parts were constructed, no engineered basal lining system was implemented. The waste was being deposited directly onto the natural ground after the top soil had been stripped. This “natural sealing layer” did not provide sufficient hydrogeological barrier against the leachate migrating from the landfill body, as it was confirmed by the monitoring boreholes installed in the surrounding. On the basis of the above-mentioned circumstances, a decision was made to accomplish the landfill recultivation using impermeable top liner; thus, infiltration of precipitation into the body of the landfill will be avoided and leachate of contaminated liquids to the subsoil will be significantly reduced.
For the sealing of the landfill corpus cap, polyethylene membrane JUNIFOL PELLD (thickness 1,0 mm) was used.
Over the years, this sludge water, with its high level of alkalinity, became a serious threat for the surrounding environment. A necessity arose to secure appropriate cleaning procedures and, at the same time, to prevent further volumes of rainwater from penetrating into the sludge corpus in the future (a technical reclamation).
The reclamation works consisted in the installation of an impenetrable layer in the area of the sludge corpus cap, the sealing of leakage and gravitation canals and subsequent sealing and coverage of slopes. The sludge bed foreground was also shielded by an impermeable layer. As soon as all the reclamation procedures are finished, the sludge bed will be protected against further penetration of rainwater and repeated emergence of highly alkaline water will be avoided. The sludge corpus will acquire a high level of stability and the risk of solid particle entrainment will be also eliminated.
For the sealing of sludge corpus cap and the sludge bed foreground, waterproof membrane JUNIFOL PEHD (thickness 1,50 and 1,00 mm) was used. Non-woven geotextiles geoNETEX (area weight 200, 500 and 800 g/m2) were also installed in diverse parts of the sealing systems – in order to fulfill separation, filtration and protective functions, respectively.