Abstract
For the rehabilitation and reclamation of abandoned sandpit in Drtija (Moravče), construction composites are used as rehabilitation materials. Construction composites are produced by mixing of recycled non-hazardous waste and natural materials. In the presented study, the chemical composition of the rehabilitation materials, which are already built-in on abandoned surfaces and impact analysis on recultivation of the upper layer, was evaluated. For this purpose, the rehabilitation materials were sampled at 3 locations with test pit excavations up to a depth of 3 m, surrounding topsoils (0-10 cm) at 2 locations and leachate at 1 location. The results show that the in-built rehabilitation materials are burdened with metals (Cd, Cr, Cu, Ni, Pb, Zn), which are, however, poorly soluble under the given conditions. The latter is also indicated by the concentrations of metals in the leachate, which are within the lower limit of quantification (LOQ) area. Regarding organic substances, the presence of phenol and formaldehyde was found in the leachate. In rehabilitation materials only phenol was found in two samples. Considering that the rehabilitation materials will be covered with a layer of clay and humus and will be tilled or afforested as part of the final rehabilitation step, the impact of rehabilitation materials on the reclaimed soil is not expected. According to results of this study recultivaton of the upper layer with planting of woods is recommended.
Highlights
For the rehabilitation and reclamation of abandoned sandpit in Drtija (Moravče), construction composites are used as rehabilitation materials
S spremembo režima v poznih osemdesetih in kasnejšo prilagoditvijo zakonodaje za vstop v Evropsko skupnost je prišlo tudi do sprememb okoljske zakonodaje (Elliot in Udovč, 2005)
Odpadni materiali iz Preglednica 5: Vrednosti parametrov v vodnih izlužkih porušenih vzorcev sanacijskega materiala skupaj z mejnimi vrednostmi parametrov izlužka za inertne odpadke ter osnovnimi statistikami Table 5: Values of parameters in water leachates of demolished samples of rehabilitation material together with limit values of leachate parameters for inert waste and basic statistics
Summary
Obravnavano območje se nahaja približno 1 – 1,5 km vzhodno od Moravč, približno 30 km vzhodno od Ljubljane. Vzhodno od obravnavanega območja se nahaja usedalni bazen (Slika 1), ki je urejen z varnostnim nasipom za preprečevanje izliva vode v okolje. Usedalni bazen je nastal kot posledica pridobivanja kremenovega peska, zaradi česar je nastala depresija, v kateri so se zadrževale oziroma izlivale meteorne vode z območja peskokopa ter iz potoka Stražca. V morfološkem pogledu gre za podolgovato območje površine približno 5 ha, ki se razprostira v smeri vzhod – zahod. Najpomembnejši vodotok predstavlja potok Drtijščica, ki teče približno 400 m južno od obravnavanega območja. Pomemben vodotok predstavlja tudi potok Stražca, ki teče na severnem obrobju obravnavanega območja v smeri proti zahodu, kjer se pri naselju Zalog pri Moravčah izliva v Drtijščico. Potok Stražca izvira na treh lokacijah na severovzhodni strani območja, na nadmorski višini približno 420 m.
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