Thermal analysis of growing media obtained from mixtures of paper mill waste materials and sewage sludge |
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Authors: | A Méndez S Barriga F Guerrero G Gascó |
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Institution: | 1.Departamento de Ingeniería de Materiales,E.T.S.I. Minas, Universidad Politécnica de Madrid,Madrid,Spain;2.Departamento de Edafología,E.T.S.I. Agrónomos, Universidad Politécnica de Madrid,Madrid,Spain |
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Abstract: | This study deals with thermal analysis of growing media obtained from mixtures of paper will waste materials (one de-inking
paper sludge, HP, and one reject from paper mill producing paper from virgin wood, RT) with sewage sludge. For the growing
media formulation, one sewage sludge (L) was mixed with both paper mill waste materials at 10, 20, and 30% in volume. An incubation
experiment was designed in order to study their carbon mineralization. Addition of sewage sludge significantly increases the
carbon mineralization of growing media based on RT. In case of HP, carbon mineralization increases after addition of sewage
sludge in 30% (HP + 30L treatment). Thermogravimetric analysis (TG and DTG) of growing media was performed before and after
incubation experiment in order to study the organic matter transformation. The higher the carbon mineralization, the greater
the difference between TG curves of samples before and after the incubation. The WL3/WL2 ratio increases after incubation of samples as a result of organic matter stabilisation. For HP growing media, the highest
value corresponds to HP + 30L whereas HP + 20L, and HP + 10L show similar values. In case of RT, the WL3/WL2 index shows a progressive increase with sewage sludge content. |
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