Chemical, Physical and Leaching Studies of Bottom Ash from a Medium-sized (32 MW) Municipal District Heating Plant for Assessing its Suitability for an Earth Construction Agent and for a Fertilizer used in Agriculture and in Forestry
In Finland, the new limit values for the maximal allowable heavy metal concentrations in agricultural and forestry fertilizers came into force in March 2007 and for materials used as an earth construction agent in July 2006. From the utilization point of view, it was notable that the total heavy met...
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ftdpipublojs:oai:ojs.dpi-journals.com:article/1434 2023-05-15T17:42:40+02:00 Chemical, Physical and Leaching Studies of Bottom Ash from a Medium-sized (32 MW) Municipal District Heating Plant for Assessing its Suitability for an Earth Construction Agent and for a Fertilizer used in Agriculture and in Forestry RISTO PÖYKIÖ , HANNU NURMESNIEMI and RIITTA L. KEISKI 2015-07-15 application/pdf http://www.dpi-journals.com/index.php/JRST/article/view/1434 eng eng Journal of Residuals Science & Technology http://www.dpi-journals.com/index.php/JRST/article/view/1434/1287 Copyright (c) 2015 Journal of Residuals Science & Technology Journal of Residuals Science & Technology; Vol 5, No 1 2376-578X 1544-8053 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 2015 ftdpipublojs 2018-01-16T08:16:23Z In Finland, the new limit values for the maximal allowable heavy metal concentrations in agricultural and forestry fertilizers came into force in March 2007 and for materials used as an earth construction agent in July 2006. From the utilization point of view, it was notable that the total heavy metal concentrations in the bottom ash originating from the 32 MW municipal district heating plant of Kemin Energia Oy at Kemi, Northern Finland, did not exceed the maximal allowable heavy metal concentrations for ash used as a fertilizer in agriculture and in forestry. Furthermore, the total heavy metal as well as the leachable heavy metal and the leachable DOC, fluoride, sulphate and chloride concentrations in the extractant were lower than the limit values for materials used as an earth construction agent. According to a five-stage sequential leaching study, in which the distribution of heavy metals in the bottom ash between the water soluble (H2O), exchangeable (CH3COOH), easily reduced (NH2OH-HCl), oxidizable (H2O2 + CH3COONH4), and residual fractions (HF + HNO3 + HCl) were evaluated, the highest concentrations of most of the heavy metals occurred in the residual fraction, which means that heavy metals in ash are tightly bound to the matrix. The results indicated that, the bottom ash is a potential material to be used especially as an earth construction agent. Article in Journal/Newspaper Northern Finland DPI Journals (Destech Publications) |
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English |
description |
In Finland, the new limit values for the maximal allowable heavy metal concentrations in agricultural and forestry fertilizers came into force in March 2007 and for materials used as an earth construction agent in July 2006. From the utilization point of view, it was notable that the total heavy metal concentrations in the bottom ash originating from the 32 MW municipal district heating plant of Kemin Energia Oy at Kemi, Northern Finland, did not exceed the maximal allowable heavy metal concentrations for ash used as a fertilizer in agriculture and in forestry. Furthermore, the total heavy metal as well as the leachable heavy metal and the leachable DOC, fluoride, sulphate and chloride concentrations in the extractant were lower than the limit values for materials used as an earth construction agent. According to a five-stage sequential leaching study, in which the distribution of heavy metals in the bottom ash between the water soluble (H2O), exchangeable (CH3COOH), easily reduced (NH2OH-HCl), oxidizable (H2O2 + CH3COONH4), and residual fractions (HF + HNO3 + HCl) were evaluated, the highest concentrations of most of the heavy metals occurred in the residual fraction, which means that heavy metals in ash are tightly bound to the matrix. The results indicated that, the bottom ash is a potential material to be used especially as an earth construction agent. |
format |
Article in Journal/Newspaper |
author |
RISTO PÖYKIÖ , HANNU NURMESNIEMI and RIITTA L. KEISKI |
spellingShingle |
RISTO PÖYKIÖ , HANNU NURMESNIEMI and RIITTA L. KEISKI Chemical, Physical and Leaching Studies of Bottom Ash from a Medium-sized (32 MW) Municipal District Heating Plant for Assessing its Suitability for an Earth Construction Agent and for a Fertilizer used in Agriculture and in Forestry |
author_facet |
RISTO PÖYKIÖ , HANNU NURMESNIEMI and RIITTA L. KEISKI |
author_sort |
RISTO PÖYKIÖ , |
title |
Chemical, Physical and Leaching Studies of Bottom Ash from a Medium-sized (32 MW) Municipal District Heating Plant for Assessing its Suitability for an Earth Construction Agent and for a Fertilizer used in Agriculture and in Forestry |
title_short |
Chemical, Physical and Leaching Studies of Bottom Ash from a Medium-sized (32 MW) Municipal District Heating Plant for Assessing its Suitability for an Earth Construction Agent and for a Fertilizer used in Agriculture and in Forestry |
title_full |
Chemical, Physical and Leaching Studies of Bottom Ash from a Medium-sized (32 MW) Municipal District Heating Plant for Assessing its Suitability for an Earth Construction Agent and for a Fertilizer used in Agriculture and in Forestry |
title_fullStr |
Chemical, Physical and Leaching Studies of Bottom Ash from a Medium-sized (32 MW) Municipal District Heating Plant for Assessing its Suitability for an Earth Construction Agent and for a Fertilizer used in Agriculture and in Forestry |
title_full_unstemmed |
Chemical, Physical and Leaching Studies of Bottom Ash from a Medium-sized (32 MW) Municipal District Heating Plant for Assessing its Suitability for an Earth Construction Agent and for a Fertilizer used in Agriculture and in Forestry |
title_sort |
chemical, physical and leaching studies of bottom ash from a medium-sized (32 mw) municipal district heating plant for assessing its suitability for an earth construction agent and for a fertilizer used in agriculture and in forestry |
publisher |
Journal of Residuals Science & Technology |
publishDate |
2015 |
url |
http://www.dpi-journals.com/index.php/JRST/article/view/1434 |
genre |
Northern Finland |
genre_facet |
Northern Finland |
op_source |
Journal of Residuals Science & Technology; Vol 5, No 1 2376-578X 1544-8053 |
op_relation |
http://www.dpi-journals.com/index.php/JRST/article/view/1434/1287 |
op_rights |
Copyright (c) 2015 Journal of Residuals Science & Technology |
_version_ |
1766144561186340864 |