Characterisation of Municipal Sewage Sludge as a Soil Improver and a Fertilizer Product

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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2019-09
Major/Subject
Mcode
Degree programme
Language
en
Pages
11
547-557
Series
ECOLOGICAL CHEMISTRY AND ENGINEERING S-CHEMIA I INZYNIERIA EKOLOGICZNA S, Volume 26, issue 3
Abstract
In this study, we have determined the main important physical and chemical properties of municipal sewage sludge and compared them to the requirements of the Finnish Fertilizer Product Act and Fertilizer Product Decree in order to assess the potential utilization of this by-product as a fertilizer. Except for Hg (1.4 mg/kg d.m.), the total concentrations of Cd, Cu, Ni, Pb, Zn, Cr and As in our sewage sludge were lower that the Finnish maximum permissible heavy metal concentrations for sewage sludge used as a fertilizer products. However, the sewage sludge may be utilized as a soil improver, a growing media or as a fertilizer product in landfill sites (e.g. surface structures) or in other closed industrial areas, because the above mentioned Finnish limit values are not applied at these sites. If the sewage sludge is to be utilized in these kinds of areas, an environmental permit may be needed. According to BCR-extraction, the lowest release potential (solubility) from the sample matrix was observed for sulphur(58.4 %) and the highest for Cd (100 %).
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Keywords
BCR extraction, fertilizer, sewage sludge, wastewater treatment, waste, WASTE-WATER SLUDGE, HEAVY-METALS, SEQUENTIAL EXTRACTION, FRACTIONATION, SPECIATION, SINGLE, ASH
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Citation
Pöykiö , R , Watkins , G & Dahl , O 2019 , ' Characterisation of Municipal Sewage Sludge as a Soil Improver and a Fertilizer Product ' , Chemia i Inżynieria Ekologiczna , vol. 26 , no. 3 , pp. 547-557 . https://doi.org/10.1515/eces-2019-0040