Effects of Composted and Thermally Dried Sewage Sludges on Soil and Soil Humic Acid Properties

doi:10.1016/S1002-0160(09)60119-3

Pedosphere

Volume 19, Issue 3, June 2009, Pages 281-291

https://doi.org/10.1016/S1002-0160(09)60119-3 Get rights and content

ABSTRACT

The effect of annual additions of composted sewage sludge (CS) and thermally dried sewage sludge (TS) at 80 t ha⁻¹ on soil chemical properties was investigated for three years in a field experiment under semiarid conditions. Humic acids (HAs) isolated by conventional procedures from CS, TS, and unamended (SO) and sludge amended soils were analysed for elemental (C, H, N, S and O) and acidic functional groups (carboxylic and phenolic) and by ultraviolet-visible, Fourier transform infrared and fluorescence spectroscopies. With respect to CS, TS had similar pH and total P and K contents, larger dry matter, total organic C, total N and C/N ratio and smaller ash content and electrical conductivity. Amendment with both CS and TS induced a number of modifications in soil properties, including an increase of pH, electrical conductivity, total organic C, total N, and available P. The CS-HA had greater O, total acidity, carboxyl, and phenolic OH group contents and smaller C and H contents than TS-HA. The CS-HA and TS-HA had larger N and S contents, smaller C, O and acidic functional group contents, and lower aromatic polycondensation and humification degrees than SO-HA. Amended soil-HAs showed C, H, N and S contents larger than SO-HA, suggesting that sludge HAs were partially incorporated into soil HAs. These effects were more evident with increasing number of sludge applications.

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: Project supported by the European Social Fund.

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Effects of Composted and Thermally Dried Sewage Sludges on Soil and Soil Humic Acid Properties

ABSTRACT

Chemosphere.

Bioresour. Technol.

Soil Till. Res.

Waste Ma. Res.

Soil Till. Res.

Geochim. Cosmochim. Acta.

Geomorphology.

The Infrared Spectra of Complex Molecules

Changes in the humic acid fraction of soil resulting from sludge application

Soil Sci. Soc. Am. J.

Information provided on humic substances by E4/E6 ratios

Soil Sci. Soc. Am. J.

Carbon mineralization in an arid soil amended with thermally-dried and composted sewage sludge

Sci. Total Environ.

Effects of sewage sludge amendment on humic acids and microbiological properties of a semiarid Mediterranean soil

Biol. Fertil. Soils.

Carbon-13 CPMAS NMR and FTIR spectroscopic studies of humic acids

Soil Sci.

The Practical Handbook of Compost Engineering

Ammonium-N determination. Soil nitrogen. Berthelot reaction

Commu. SoilSci. Plant Anal.

Analytical methodology for elemental analysis of humic substances

Information provided on humic substances by E₄/E₆ ratios