Abstract:
:A column leaching study was carried out over a period of 77 days to determine the changes in the chemistry of an acid soil and of the corresponding leachates after the addition of an anaerobic sludge (equivalent to 69 Mg DW ha(-1)). By the end of the experiment, the addition of the sludge to the soil had induced an increase in soil pH (from pH 3.6-4.0 to pH 4.1-4.8), in spite of the pronounced decrease in pH detected in the leachates by day 18 of the experiment. The decrease in pH (down to pH 3.3) occurred at the same time as leachate SO(4) and Fe peaked. Once the acidification attributed to sulphide oxidation ceased, the "liming effect" of the sludge became evident and counteracted further proton production - such as that associated with oxidation of NH(4) - at least for the duration of the study. Concentrations of Zn, Cd, Ni, and to a lesser extent, Pb in leachates displayed pulses at the beginning of the experiment (first 12 days), whereas the concentration of Cu followed a more irregular pattern; the concentrations of these metals never surpassed the European threshold values for drinking water. In contrast, concentrations of NO(3), Mn, and Cr in leachates had increased by the end of the experiment - in parallel with an increase in dissolved organic C (DOC) - and surpassed the European threshold for drinking water. Mineralisation of native soil organic C (SOC) was enhanced by the addition of this N-rich residue, and the organic C mass balance at the end of the experiment was negative. Nitrogen mass balance, although positive, exhibited a loss of 77% of the N added to the system. The results obtained indicate that application of this sewage sludge to a soil with a pH<5, at the loading rate used here, and without liming (i.e., non fulfilment of the requirements of the present European Directive) may pose a risk in terms of groundwater contamination.
journal_name
Chemospherejournal_title
Chemosphereauthors
Egiarte G,Camps Arbestain M,Ruíz-Romera E,Pinto Mdoi
10.1016/j.chemosphere.2006.04.044subject
Has Abstractpub_date
2006-12-01 00:00:00pages
2456-67issue
11eissn
0045-6535issn
1879-1298pii
S0045-6535(06)00507-8journal_volume
65pub_type
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