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Relevance of Organic Matter Fractions as Predictors of Wastewater Sludge Mineralization in Soil

^a INRA, Unité d'Agronomie de Laon-Reims-Mons, 2 esplanade R. Garros, BP 224, 51686 Reims cedex 2, France
^b ENSAR, Laboratoire de Mathématiques Appliquées, 65 rue de St Brieuc, CS 84215, 35042 Rennes cedex, France

View larger version (20K): [in a new window]   Fig. 1. Carbon and nitrogen distribution (C to N ratio) in the fractions obtained by the fractionation of organic matter of wastewater sludges. W20, water-soluble fraction at 20°C; W20–100, water-soluble fraction from 20 to 100°C; W100, water-insoluble fraction at 100°C; SOL, soluble compounds; HEM, hemicellulose-like compounds; CEL, cellulose-like compounds; LIG, lignin-like compounds; AcS, acid-soluble fraction; AcIns, acid-insoluble fraction; Dist, distillable; NDist, nondistillable.

View larger version (31K): [in a new window]   Fig. 2. Cumulative C mineralization of wastewater sludges measured during the 168-d soil incubation.

View larger version (14K): [in a new window]   Fig. 3. Relationship between C mineralized during the first 28-d soil incubation and sludge N present in the lignin-like fraction.

View larger version (34K): [in a new window]   Fig. 4. Soil N dynamics after incorporation of sludges measured during the 168-d soil incubation.

View larger version (14K): [in a new window]   Fig. 5. Relationship between net N mineralized during the first 112-d soil incubation and organic C to organic N ratio of wastewater sludges.

View larger version (45K): [in a new window]   Fig. 6. Projection of variables onto the plane defined by the two first principal component multiple factor analysis (MFA). The coordinates of each variable are the correlation coefficients with the two first principal components. The variables are better represented in this plane when arrow points are close to the circle. When they are correctly represented, the correlations between variables are greater when the angle between their direction is smaller. Org, organic; Tot, total; Inorg, inorganic; No/Co, organic N to organic C ratio; Co/No, organic C to organic N ratio; C/N, total C to total N ratio; W20, water-soluble fraction at 20°C; W20–100, water-soluble fraction from 20 to 100°C; W100, water-insoluble fraction at 100°C; SOL, soluble compounds; HEM, hemicellulose-like compounds; CEL, cellulose-like compounds; LIG, lignin-like compounds; AcS, acid-soluble fraction; Dist, distillable; NDist, nondistillable; AcIns, acid-insoluble fraction. An abbreviation preceded by C/N, C, or N refers to the C to N ratio or the part of sludge C or N present in that specific organic fraction, respectively. The number (day) following C or N refers to carbon or nitrogen mineralization at that day.

View larger version (34K): [in a new window]   Fig. 7. Projection of the different sludges on the plane defined by the first two principal components; each sludge is represented by three aligned points: the middle point corresponds to the characterization by the two groups of variables ("B" plus one or two digits), with the extremities of the line corresponding respectively to the characterization by the group of composition variables (1) and the group of mineralization variables (2).