magistrsko delo
Povzetek
Tla vojaških strelišč so onesnažena s kovinami in polkovinami (PSK) kot posledica vojaške dejavnosti. Tla vojaškega strelišča, ki smo jih uporabili v magistrski nalogi, so bila onesnažena s Pb, Cu, Cr, Fe, As in Sb, najbolj pa sta izstopala Pb s 4,5-krat in Cu z 1,3-krat preseženo kritično imisijsko mejo. PSK predstavljajo nevarnost tako za okolje kot za zdravje ljudi, zato je sanacija onesnaženih območij nujno potrebna. Čiščenje tal na vojaških tleh je zaradi kopičenja kovinskih fragmentov nabojev specifično. Namen magistrske naloge je bil optimizirati že obstoječo tehnologijo čiščenja tal ReSoil in jo prilagoditi za specifična vojaška tla. V prvem delu poskusa smo testirali različne kombinacije reagentov in njihovih koncentracij, razmerje med trdno in tekočo fazo ter dvojno ekstrakcijo. Za kelatno sredstvo za vezavo in odstranjevanje PSK smo uporabili EDTA (etilendiamintetraocetna kislina). Kot najbolj učinkovita se je izkazala uporaba 100 mM EDTA v kombinaciji s 60 mM citronsko kislino, na razmerju tla : pralna raztopina 1: 1,5 ter času ekstrakcije 1 uro. Potrebno je predhodno sejanje tal na 0,5 mm, saj s sejanjem znižamo koncentracije PSK v originalnih tleh. V drugem delu poskusa smo preverili, ali je recikliranje raztopin in EDTA možno tudi za novo razvito metodo. PSK smo iz tal odstranili s trikratnim spiranjem ter na podlagi meritev tal in procesnih raztopin določili učinkovitost odstranitve PSK iz tal. V poskusu smo uspešno reciklirali EDTA. Mobilnost kovin smo določali s sekvenčno ekstrakcijo ter z ekstrakcijo lahko določljivih kovin z NH4NO3. Po remediaciji se je mobilnost kovin (razen Sb) drastično povečala. Koncentracije Pb in Cu so padle pod kritično imisijsko vrednostjo. Z novo razvito metodo nismo bistveno vplivali na pedološke lastnosti tal.
Ključne besede
vojaško strelišče;čiščenje tal;EDTA;potencialno strupene kovine;recikliranje;
Podatki
| Jezik: |
Slovenski jezik |
| Leto izida: |
2024 |
| Tipologija: |
2.09 - Magistrsko delo |
| Organizacija: |
UL BF - Biotehniška fakulteta |
| Založnik: |
[V. Gabrovšek] |
| UDK: |
504.5:711.559.6:799.313:502.174(043.2) |
| COBISS: |
208816899
|
| Št. ogledov: |
62 |
| Št. prenosov: |
16 |
| Ocena: |
0 (0 glasov) |
| Metapodatki: |
|
Ostali podatki
| Sekundarni jezik: |
Angleški jezik |
| Sekundarni naslov: |
Removal of toxic metals and metalloids from contaminated soil of a military shootinh [!] range using ethylenediaminetetraacetic acid-based processes |
| Sekundarni povzetek: |
The soil of military shooting ranges is contaminated with metals and metalloids (PTM) as a result of military activities. The soil of the military shooting range used in the master's thesis was contaminated with Pb, Cu, Cr, Fe, As and Sb, with Pb 4,5 times and Cu 1,3 times the critical immission limit stood out the most. PTM are a threat to both, the environment and human health, so the remediation of contaminated areas is urgently needed. Remediation on military soil is specific due to the accumulation of metal fragments of bullets. The aim of the master’s thesis was to optimize the existing ReSoil soil cleaning technology and adapt it to specific military soil. In the first part of the experiment, we tested different combinations of reagents and their concentrations, the ratio between solid and liquid phase and double extraction. EDTA (ethylendiamintetraacetic acid) was used as a chelating agent for binding and removing PTMs. The most effective was the use of 100 mM EDTA in combination with 60 mM citric acid, at a soil: washing solution ratio of 1:1,5 and an extraction time of 1 hour. Pre-seeding of the soil to 0,5 mm is necessary, as seeding reduces the concentrations of PTM in the original soil. In the second part of the experiment, we checked, whether recycling of solutions and EDTA is possible for the newly developed method. PTM was removed from the soil by three rinsing and the efficiency of PTM removal from the soil was determined on the basis of soil measurements and process solutions. In the experiment, we successfully recycled EDTA. The mobility of metals was determined by sequential extraction and by extraction of metals with NH4NO3. After remediation, the mobility of metals (except Sb) increased drastically. Concentrations of Pb and Cu fell below the critical immission value. The newly developed method did not significantly affect the soil soil characteristics. |
| Sekundarne ključne besede: |
military shooting range;soil remediation;EDTA;potentially toxic metals;recycling; |
| Vrsta dela (COBISS): |
Magistrsko delo/naloga |
| Študijski program: |
0 |
| Komentar na gradivo: |
Univ. v Ljubljani, Biotehniška fak., Oddelek za agronomijo |
| Strani: |
1 spletni vir (1 datoteka PDF (X, 48 str., [5] str. pril.)) |
| ID: |
25124181 |