Hrvatske vode
 
Obrada kiselih rudničkih efluenata i otpadnih voda iz prališta brodova primjenom crvenog mulja
Treatment of Acidic Mine Effluents and Wastewater from Ship Cleaning Facilities by Application of Red Mud

Višnja Oreščanin1, Robert Kollar2, Karlo Nađ2

Sažetak/Abstract: 

U radu je prikazan postupak obrade kiselog efluenta nastalog u toku eksploatacije i prerade bakrene rude kompleksa Borskih rudnika (Bor- Krivelj-Cerovo) pomoću crvenog mulja - otpadnog produkta iz procesa proizvodnje glinice u bivšoj tvornici glinice iz Obrovca te primjena nastalog otpadnog mulja za pročišćavanje otpadnih voda iz prališta brodova. Izvršena je karakterizacija otpadnih voda i crvenog mulja te su utvrđeni optimalni uvjeti uklanjanja ključnih pokazatelja iz otpadnih voda. Rudnička otpadna voda je karakterizirana niskom pH vrijednošću (3,21), visokom koncentracijom sulfata (10830 mg dm-3), visokim vrijednostima željeza (921 mg dm-3), mangana (107 mg dm-3), bakra (92 mg dm-3) i cinka (59 mg dm-3), dok su u otpadnoj vodi iz prališta brodova ključna onečišćivala bakar (34 mg dm-3), cink (59 mg dm-3) i boja (11470 PtCo). Obzirom na visok neutralizacijski i sorpcijski kapacitet crvenog mulja, njegovo miješanje s rudničkom otpadnom vodom u optimalnim omjerima dovodi do neutralizacije oba otpadna produkta te uklanjanja teških metala iz otpadne vode ispod graničnih vrijednosti. Pri optimalnim uvjetima uklanjanja (pH = 8; kontaktno vrijeme = 15 minuta) uklonjeno je više od 99,9% Cr, Mn, Fe, Cu i Zn te 65,5% sulfata. Preostali otpadni mulj je moguće ponovo upotrijebiti za pročišćavanje otpadnih voda iz prališta brodova visoko opterećenih bojama protiv obraštaja, a s jednom dozom mulja je moguće izvršiti pet ciklusa pročišćavanja s učinkovitošću uklanjanja ključnih pokazatelja preko 99%.

 

The paper presents a procedure for treating acidic effluent generated during the exploitation and proce­ssing of copper ore at the Bor mining complex (Bor-Krivelj-Cerovo) by application of red mud, a waste by-product of the alumina production process at the now-defunct alumina plant in Obrovac, and the application of the generated waste mud to treating wastewater from ship cleaning facilities. The characterisation of wastewater and red mud was carried out, resulting in the determination of optimal conditions for the removal of key indicators from wastewater. The acidic mine wastewater is characterised by a low pH value (3.21), high sulfate concentration (10,830 mg dm-3), high values of iron (921 mg dm-3), manganese (107 mg dm-3), copper (92 mg dm-3) and zinc (59 mg dm-3), whereas the key polluters in the wastewater from ship cleaning facilities include copper (34 mg dm-3), zinc (59 mg dm-3) and paint (11470 PtCo). Considering a high neutralisation and adsorption capacity of red mud, its mixing with mine drainage wastewater in op­timal ratios leads to the neutralisation of both waste by-products and the removal of heavy metals from wastewater to below their limit values. Under the optimal removal conditions (pH = 8; contact time = 15 minutes), more than 99.9% of Cr, Mn, Fe, Cu and Zn as well as 65.5% of sulfates were removed. The remaining waste mud can be reused in the treatment of wastewater from ship cleaning facilities which has a high load of anti-fouling paint. A single mud dosage is sufficient for five treatment cycles and has a key indicator removal efficiency rate of over 99%.

Kategorija: 
Izvorni (originalni) znanstveni članak / Original Scientific Paper
Ključne riječi/Key words: 

crveni mulj, kisela rudnička voda, otpadna voda prališta brodova, obrada otpadnih voda

red mud, acid mine drainage, wastewater from ship cleaning facilities, wastewater treatment

Podaci o autorima/Authors affiliations: 

1Oreščanin, j.d.o.o., A. Jakšića 30, 10000 Zagreb, vorescanin@gmail.com

 

2Napredna energija, d.o.o., V. Prekrata 43, 10000 Zagreb

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