Raul ZORNOZA, Angel Faz CANO, Dora M. CARMONA, Jose A. ACOSTA, Silvia MARTÍNEZMARTÍNEZ, Sebla KABAS

Carbon mineralization in mine tailing ponds amended with pig slurries and marble wastes

Effective application of organic residues to reclaim soils requires the optimization of the waste management to minimize CO2 emissions and optimize soil C sequestration efficiency. In this study, the short-term effects of pig slurry amendment alone and together with marble waste on organic matter mineralization in two tailing ponds from Cartagena-La Unión Mining District (SE Spain) were investigated in a field remediation experiment. The treatments were: marble waste (MW), pig slurry (PS), marble waste + pig slurry (MW+PS), and control. Soil carbon mineralization was determined using a static chamber method with alkali absorption during 70 days. Soil respiration rates in all plots were higher the first days of the experiment owing to higher soil moisture and higher mean air temperature. MW plots followed the same pattern than control plots, with similar respiration rates. The addition of pig slurry caused a significant increase in the respiration rates, although in MW+PS plots, respiration rates were lower than in PS plots. The cumulative quantities of C-CO2 evolved from the pig slurry mineralization were fitted to a first-order kinetic model explaining 90% of the data. This model implies the presence of only one mineralisable pool (C0). The values of the index C0*constant rate/added C were similar for PS plots in both tailing ponds, but lower in the MW+PS treatment, suggesting that the application of marble reduces the degradability of the organic compounds present in the pig slurry. Thus, the application of marble wastes contributes to slow down the loss of organic matter by mineralization.

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Barker, A.V., 1997. Composition and uses of compost. In Agricultural uses of by-products and wastes (pp. 140-162). ACS Symposium Series No. 668, Vol 10. American Chemical Society, Washington DC.
Bernal, M.P., Roig, A., Cegarra, J., 1991. Effect of pig slurry additions on the organic carbon of cacareous soils. Bioresource Technology, 37, 867-876.
Conant, R.T., Klopatek, J.M., Klopatek, C.C., 2000. Environmental factors controlling soil respiration in three semiarid ecosystems. Soil Sci. Soc. Am. J. 64, 383-390.
Conesa, H.M., Faz, A., Arnaldos, R., 2006. Heavy metal accumulation and tolerance in plants from mine tailings of the semiarid Cartagena-La Union mining district (SE Spain). Science of the Total Environment, 366, 1-11.
Council Directive 91/676/EEC. Protection of waters against pollution caused by nitrates from agricultural sources. Official Journal L 375, pp. 1-8.
Kao, P.H., Huang, C.C., Hseu, Z.Y., 2006. Response of microbial activities to heavy metals in a neutral loamy soil treated with biosolid. Chemosphere, 64, 63-70.
Merckx, R., Brans, K., Smolders, E., 2001. Decomposition of dissolved organic carbon after soil drying and rewetting as an indicator of metal toxicity in soils. Soil Biology & Biochemistry, 33, 235-240.
Mondini, C., Cayuela, M.L., Sinocco, T., Cordaro, F., Toig, A., Sánchez-Monedero, M.A., 2007. Greenhouse gas emissions and carbon sink capacity of amended soils evaluated under laboratory conditions. Soil Biology & Biochemistry, 39, 1366–1374.
Nwachutkwu, O.I., Pulford, I.D., 2011. Microbial respiration as an indicator of metal toxicity in contaminated organic materials and soil. Journal of Hazardous.. Materials, 185, 1140-1147.
Pardo, T., Clemente, R., Bernal, M.P., 2011. Effects of compost, pig slurry and lime on trace element solubility and toxicity in two soils differently affected by mining activities. Chemosphere, 54, 642-650.
Saviozzi, A., Levi-Minzi, R., Riffaldi, R., 1993. Mineralization parameters form organic materials added to soil as a function of their chemical composition. Bioresource Technology, 45, 131-135.
Senesi, N., Plaza, C., Brunetty, G., Polo, A., 2007. A comparative survey of recent results on humic-like fractions in organic amendments and effects on native soil humic substances. Soil Biology & Biochemistry, 39, 1244–1262.
Shrestha, R.K., Lal, R., 2006. Ecosystem carbon budgeting and soil carbon sequestration in reclaimed mine soil. Environment International, 32, 781-796.
Sobek, A.A., Schuller, W.A., Freeman, J.R., Smith, R.M., 1978. Field and laboratory methods applicable to overburdens and mine soils. EPA-600/2-78-054.
Stevenson, F.J., 1994. Humus Chemistry: Genesis, Composition, Reactions. New York: Wiley.
Ye, Z.H., Shu, W.S., Zhang, Z.Q., Lan, C.Y., Wong, M.H., 2002. Evaluation of major constraint to revegetation of lead/zinc mine tailings using bioassay techniques. Chemosphere, 47, 1103-1111.
Zanuzzi, A., Arocena, J.M., van Mourik, J.M., Faz, A., 2009. Amendments with organic and industrial wastes stimulate soil formation in mine tailings as revealed by micromorphology. Geoderma, 154, 69-75.
Zibilske, L.M., 1994. Carbon mineralization. In Methods of soil analysis. Part 2. Microbiological and biochemical properties (pp. 835–863). SSSA Book Series 5. SSSA, Madison.