Speciation of heavy metals in sewage sludge after mesophilic and thermophilic anaerobic digestion |
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Authors: | Email author" target="_blank">Lidia?D?browskaEmail author |
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Institution: | 1.Department of Chemistry, Water, and Wastewater Technology, Faculty of Environmental Protection and Engineering,Czestochowa University of Technology,Cz?stochowa,Poland |
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Abstract: | Two types of sewage sludge anaerobic digestion were carried out: mesophilic and thermophilic. Metal speciation analysis was
performed revealing some changes in the chemical form of the metals during the stabilization process of sludge. After both
methane fermentation processes, a comparable level of organic matter distribution was obtained (≈ 40 %). The amount of produced
methane during thermophilic and mesophilic digestion was 560 mL of CH4 and 580 mL of CH4 from 1 g of removed organic matter, respectively. Low concentration of heavy metal ions in the liquid phase of sludge was
observed. Metal ions precipitated and remained bound throughout the stabilization process. No accumulation of heavy metals
in the mobile fractions of sludge (exchangeable and carbonate) was observed for either digestion process. The highest increase
of zinc, copper, nickel, cadmium, and chromium concentration was observed in the organic-sulfide fraction, whereas the highest
increase of lead was found in the residual fraction. |
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