Laboratory appraisal of organic carbon changes in mixtures made with different inorganic wastes |
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| Authors: | M Camps Arbestain ML Ibargoitia Z Madinabeitia MV Gil S Virgel A Morán R Calvelo Pereira F Macías |
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| Institution: | 1. NEIKER, Berreaga, 1. 48160-Derio, Bizkaia, Spain;2. Departamento de Edafología y Química Agrícola, Facultad de Biología, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain;3. Instituto de Recursos Naturales, Grupo de Ingeniería Química y Ambiental, Avenida de Portugal, 41, Universidad de León, 24071 León, Spain;1. Department of Chemistry, College of Sciences, Shiraz University, Shiraz 71454, Iran;2. Young Researchers and Elite Club, Pharmaceutical Sciences Branch, Islamic Azad University, Tehran, Iran;1. Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt;2. Chemistry Department, Faculty of Science, Benha University, Benha, Egypt;1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;2. Key Laboratory of Yueyang Chinese Herbal Utilization, Yueyang Vocational Technical College, Yueyang 414000, China;1. Institute of Physics, Czech Academy of Sciences, Prague, Czech Republic;2. National Institute for Laser, Plasma and Radiation Physics, CETAL, Magurele, Romania;3. Holst Centre – Solliance, Eindhoven, the Netherlands;4. Faculty of Electrical Engineering, Czech Technical University, Prague, Czech Republic;5. ”Horia Hulubei” National Institute of Physics and Nuclear Engineering, Magurele, Romania |
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| Abstract: | Mixtures of organic and inorganic wastes were incubated to examine the changes in organic C (OC) contents. An anaerobic sludge and a CaO-treated aerobic sludge, with OC concentrations of 235 and 129 g kg?1, were used. The inorganic wastes used – referred to as “conditioners” – were shot blasting scrap, fettling, Linz-Donawitz slag, foundry sand (FS), and fly ash from wood bark combustion (FA). The total OC (TOC) and oxidized OC were determined. DTA-TGA profiles and FTIR spectra were also obtained. Mixtures made with the FS contained significantly lower (P < 0.05) amounts of TOC (45 g kg?1) than the rest of mixtures, which was attributed to the non-existence of reactive surfaces in the conditioner and the increased aeration induced by this material. Those made with FA contained significantly higher (P < 0.05) amounts of TOC (170 g kg?1), which was attributed to: (i) the addition of an extra source of C – black carbon (BC) – in the FA, and (ii) the inhibition of mineralization from the compounds present in this conditioner (e.g., amorphous aluminosilicates, BC). The results highlight the importance of the characteristics of the conditioners on the fate of the OM originating from the sludges. |
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