Effect of Alkaline-Stabilised Sewage Sludge onExtractable Organic Carbon and Copper in SoilsEnglish Full Text

LUO YONGMING1 and P. CHRISTIE21Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China)2Department of Agricultural and Environmental Science, The Queen’s University of Belfast, Newforge Lane,Belfast BT9 5PX (UK)

Abstract: An incubation experiment was conducted to evaluate the potential for water contamination with sludge-derived organic substances and copper following land application of alkaline-stabilised sewage sludge. Twocontrasting sludge-amended soils were studied. Both soils were previously treated with urban and ruralalkaline biosolids separately at sludge application rates of 0, 30 and 120 t ha-1 fresh product. The air-driedsoil/sludge mixtures were wetted with distilled water, maintained at 40 % of water-holding capacity andequilibrated for three weeks at 4 ℃ before extraction. Subsamples were extracted with either distilled wateror 0.5 mol L-1 K2SO4 solution. The concentrations of organic C in the aqueous and chemical extractswere determined directly with a total organic carbon （TOC） analyser. The concentrations of Cu in the twoextracts were also determined by atomic absorption spectrophotometry The relationship between the twoextractable organic C fractions was examined, together with that between extractable organic C concentrationand extractable Cu concentration. Application of alkaline biosolids increased the concentrations of soil mobileorganic substances and Cu. The results are discussed in terms of a possible increase in the potential forleaching of sludge-derived organics and Cu in the sludge-amended soils.

Keywords：

clay extracts,leaching; organic matter trace metals;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S153

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Effect of Alkaline-Stabilised Sewage Sludge onExtractable Organic Carbon and Copper in SoilsEnglish Full Text

LUO YONGMING1 and P. CHRISTIE21Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China)2Department of Agricultural and Environmental Science, The Queen’s University of Belfast, Newforge Lane,Belfast BT9 5PX (UK)

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