Production of quality controlled biochar with different degree of carbonization, for growing tests and ecotoxicological studies

Leena Fagernäs, Jussi Ranta, Eeva Kuoppala

Research output: Contribution to conferenceConference PosterScientific

Abstract

Over the last years more and more attention has been paid to apply biochar in soil remediation, e.g. by mixing the material into soil. Biochar has been shown to improve not only soil biological activity but also to prevent organic and nutrient losses. However, in many cases little or no attention has been paid to biochar quality. The reason is that biochar is either produced in relatively uncontrolled conditions, like in charcoal kilns, or it is produced from secondary carbonaceous by-products, like gasification or pyrolysis residues. These all are often considered as a quality biochar. On the other hand different waste raw materials, like bio-sludge, are also used as a raw material. This leads to unwanted situation where clear conclusions cannot be made, if a certain quality parameter of biochar is important or not in the application under consideration. Biochar quality is dependent on factors such as: raw material quality (virgin materials or residues, moisture, physical nature etc.), variable reactor conditions (particle size, final charring temperature, residence, time, carbonization atmosphere). A project on biochar quality and its effects on biochar properties when applied as soil amendment is underway in Finland in 2011-2013 within the Tekes BioRefine programme. The project is carried out jointly between VTT, MTT Agriculture Research Finland and University of Helsinki. To eliminate the effect of large number of variables, different quality controlled biochar types were first produced in laboratory scale (TGA) and then in a pilot scale laboratory batch reactor of VTT (kg scale). Following definitions were made: one wood species (Betula spp.) was selected as raw material , a single longitudinal dimension of wood particles was selected, fixed moisture content of raw material was applied , nitrogen was used as reactor gas flushing, residence time was kept constant, final temperature was varied to produce three types of charcoal, with different degree of carbonization. The idea was to keep most of the biochar quality parameters constant so that only one main variable, i.e. final carbonization temperature remained. The physical and chemical properties were then analysed including charcoal yield, ash, volatiles, CHN, BET surface area and PAH content. The three biochars were delivered to MTT and University of Helsinki to be utilised for growing tests and exotoxicological studies.1 After the results from growing tests have been achieved, it is possible to assess, if the degree of carbonization is a major parameter of biochar quality. In addition to biochars, the liquids (distillates and tars) and gases produced in the carbonization tests will be studied as in our previous paper2.
Original languageEnglish
Publication statusPublished - 2013
MoE publication typeNot Eligible
Event2nd Nordic Biochar Seminar - Towards a carbon negative agriculture, NJF Seminar 459 - Helsinki, Finland
Duration: 14 Feb 201315 Feb 2013

Conference

Conference2nd Nordic Biochar Seminar - Towards a carbon negative agriculture, NJF Seminar 459
Abbreviated titleNJF Seminar 459
CountryFinland
CityHelsinki
Period14/02/1315/02/13

Fingerprint

charcoal
residence time
soil remediation
nutrient loss
temperature
soil amendment
tar
flushing
gas
pyrolysis
chemical property
moisture content
PAH
ash
soil
surface area
physical property
sludge
particle size
moisture

Keywords

  • biochar
  • carbonization degree
  • growing tests
  • ecotoxicology

Cite this

Fagernäs, L., Ranta, J., & Kuoppala, E. (2013). Production of quality controlled biochar with different degree of carbonization, for growing tests and ecotoxicological studies. Poster session presented at 2nd Nordic Biochar Seminar - Towards a carbon negative agriculture, NJF Seminar 459, Helsinki, Finland.
Fagernäs, Leena ; Ranta, Jussi ; Kuoppala, Eeva. / Production of quality controlled biochar with different degree of carbonization, for growing tests and ecotoxicological studies. Poster session presented at 2nd Nordic Biochar Seminar - Towards a carbon negative agriculture, NJF Seminar 459, Helsinki, Finland.
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Fagernäs, L, Ranta, J & Kuoppala, E 2013, 'Production of quality controlled biochar with different degree of carbonization, for growing tests and ecotoxicological studies' 2nd Nordic Biochar Seminar - Towards a carbon negative agriculture, NJF Seminar 459, Helsinki, Finland, 14/02/13 - 15/02/13, .

Production of quality controlled biochar with different degree of carbonization, for growing tests and ecotoxicological studies. / Fagernäs, Leena; Ranta, Jussi; Kuoppala, Eeva.

2013. Poster session presented at 2nd Nordic Biochar Seminar - Towards a carbon negative agriculture, NJF Seminar 459, Helsinki, Finland.

Research output: Contribution to conferenceConference PosterScientific

TY - CONF

T1 - Production of quality controlled biochar with different degree of carbonization, for growing tests and ecotoxicological studies

AU - Fagernäs, Leena

AU - Ranta, Jussi

AU - Kuoppala, Eeva

N1 - Project code: 75247

PY - 2013

Y1 - 2013

N2 - Over the last years more and more attention has been paid to apply biochar in soil remediation, e.g. by mixing the material into soil. Biochar has been shown to improve not only soil biological activity but also to prevent organic and nutrient losses. However, in many cases little or no attention has been paid to biochar quality. The reason is that biochar is either produced in relatively uncontrolled conditions, like in charcoal kilns, or it is produced from secondary carbonaceous by-products, like gasification or pyrolysis residues. These all are often considered as a quality biochar. On the other hand different waste raw materials, like bio-sludge, are also used as a raw material. This leads to unwanted situation where clear conclusions cannot be made, if a certain quality parameter of biochar is important or not in the application under consideration. Biochar quality is dependent on factors such as: raw material quality (virgin materials or residues, moisture, physical nature etc.), variable reactor conditions (particle size, final charring temperature, residence, time, carbonization atmosphere). A project on biochar quality and its effects on biochar properties when applied as soil amendment is underway in Finland in 2011-2013 within the Tekes BioRefine programme. The project is carried out jointly between VTT, MTT Agriculture Research Finland and University of Helsinki. To eliminate the effect of large number of variables, different quality controlled biochar types were first produced in laboratory scale (TGA) and then in a pilot scale laboratory batch reactor of VTT (kg scale). Following definitions were made: one wood species (Betula spp.) was selected as raw material , a single longitudinal dimension of wood particles was selected, fixed moisture content of raw material was applied , nitrogen was used as reactor gas flushing, residence time was kept constant, final temperature was varied to produce three types of charcoal, with different degree of carbonization. The idea was to keep most of the biochar quality parameters constant so that only one main variable, i.e. final carbonization temperature remained. The physical and chemical properties were then analysed including charcoal yield, ash, volatiles, CHN, BET surface area and PAH content. The three biochars were delivered to MTT and University of Helsinki to be utilised for growing tests and exotoxicological studies.1 After the results from growing tests have been achieved, it is possible to assess, if the degree of carbonization is a major parameter of biochar quality. In addition to biochars, the liquids (distillates and tars) and gases produced in the carbonization tests will be studied as in our previous paper2.

AB - Over the last years more and more attention has been paid to apply biochar in soil remediation, e.g. by mixing the material into soil. Biochar has been shown to improve not only soil biological activity but also to prevent organic and nutrient losses. However, in many cases little or no attention has been paid to biochar quality. The reason is that biochar is either produced in relatively uncontrolled conditions, like in charcoal kilns, or it is produced from secondary carbonaceous by-products, like gasification or pyrolysis residues. These all are often considered as a quality biochar. On the other hand different waste raw materials, like bio-sludge, are also used as a raw material. This leads to unwanted situation where clear conclusions cannot be made, if a certain quality parameter of biochar is important or not in the application under consideration. Biochar quality is dependent on factors such as: raw material quality (virgin materials or residues, moisture, physical nature etc.), variable reactor conditions (particle size, final charring temperature, residence, time, carbonization atmosphere). A project on biochar quality and its effects on biochar properties when applied as soil amendment is underway in Finland in 2011-2013 within the Tekes BioRefine programme. The project is carried out jointly between VTT, MTT Agriculture Research Finland and University of Helsinki. To eliminate the effect of large number of variables, different quality controlled biochar types were first produced in laboratory scale (TGA) and then in a pilot scale laboratory batch reactor of VTT (kg scale). Following definitions were made: one wood species (Betula spp.) was selected as raw material , a single longitudinal dimension of wood particles was selected, fixed moisture content of raw material was applied , nitrogen was used as reactor gas flushing, residence time was kept constant, final temperature was varied to produce three types of charcoal, with different degree of carbonization. The idea was to keep most of the biochar quality parameters constant so that only one main variable, i.e. final carbonization temperature remained. The physical and chemical properties were then analysed including charcoal yield, ash, volatiles, CHN, BET surface area and PAH content. The three biochars were delivered to MTT and University of Helsinki to be utilised for growing tests and exotoxicological studies.1 After the results from growing tests have been achieved, it is possible to assess, if the degree of carbonization is a major parameter of biochar quality. In addition to biochars, the liquids (distillates and tars) and gases produced in the carbonization tests will be studied as in our previous paper2.

KW - biochar

KW - carbonization degree

KW - growing tests

KW - ecotoxicology

M3 - Conference Poster

ER -

Fagernäs L, Ranta J, Kuoppala E. Production of quality controlled biochar with different degree of carbonization, for growing tests and ecotoxicological studies. 2013. Poster session presented at 2nd Nordic Biochar Seminar - Towards a carbon negative agriculture, NJF Seminar 459, Helsinki, Finland.