HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Wennman, P. Articles by Kätterer, T. Search for Related Content PubMed PubMed Citation Articles by Wennman, P. Articles by Kätterer, T. Agricola Articles by Wennman, P. Articles by Kätterer, T. Related Collections Municipal Waste Mining Wastes Ecosystem Restoration

TECHNICAL REPORTS

Waste Management

Effects of Moisture and Temperature on Carbon and Nitrogen Mineralization in Mine Tailings Mixed with Sewage Sludge

Department of Soil Sciences, SLU, Uppsala 750 07, Sweden

^* Corresponding author (par.wennman{at}mv.slu.se)

Received for publication April 29, 2005. Digested sewage sludge mixed with copper mine tailings was incubated for 3 mo at 16 combinations of temperature (–1, 5, 10, and 15°C) and soil moisture content (2, 8, 14, and 24% by weight). Carbon dioxide evolution and net N mineralization were measured at increasing time intervals. A two compartment first-order kinetic model (refractory and labile C) was fitted to the time series of measured CO₂ fluxes using nonlinear regression analysis. The dependencies of the rate constants on moisture and temperature could be well described by log-linear functions. The estimated Q₁₀ value (the factor by which the rate is increased as temperature is increased 10°C) was 2.55. Within the range of temperature and moisture considered here, which correspond to conditions occurring naturally in Sweden, CO₂ evolution was more strongly controlled by moisture than by temperature. Less mineral N accumulated during the experiment at the lowest moisture or temperature. However, the dependency of net N mineralization on moisture and temperature in the remaining treatments was less clear than for C evolution, presumably due to denitrification at the higher temperatures and moisture contents. Nitrate was formed after around 2 wk but only at 10 and 15°C.

Abbreviations: Q₁₀, the factor by which the rate is increased as temperature is increased 10°C • WHC, water holding capacity