Remediating Montreal’s Tree Pit Soil Applying an Ash Tree-Derived Biochar

  • Rose Seguin
  • Maryam Kargar
  • Shiv O. Prasher
  • O. Grant Clark
  • Pierre Jutras


Biochar as a soil amendment in street tree pits can be used to increase the soil’s ability to retain contaminants found in urban runoff. The increased retention can potentially decrease peak concentrations of soluble trace metals and de-icing salts in the soil solution, thereby decreasing the amounts taken up by tree roots or percolated out of the tree pits into the ground water. A leaching test measured the retention of trace metals (Cd, Zn, Cu, and Pb) and deicing salts (Na) by different kinds of biochar. The biochar was produced from hardwood (North American ash tree, Fraxinus americana) under different pyrolysis conditions, with three temperatures (350, 465 and 550 °C) and two residence times (10 and 30 min). Biochar pyrolyzed at 550 °C for 30 min significantly reduced the soluble concentrations of Zn, Cu, and Pb in the column leachate, most likely due to the its higher pH, surface area, and ash content. The pH of each treatment group was measured while the increase in ash content and surface area was inferred according to relevant literature. This biochar was then combined with soil and compost at rates ranging from 0 to 7.5% by dry weight to determine the proportion that optimally sorbed the contaminants. An application rate of 7.5% biochar by dry weight increased the soil mixture’s sorption capacity for Cd and Na while maintaining similar sorption of Cu, Zn, and Pb. The role of organic matter, such as that in compost, was especially important for the sorption of Zn and Cu. Hardwood biochar can thus improve the health of street trees and groundwater quality by sequestering trace metals and de-icing salts. Biochar can also be a useful tool to remediate contaminated soil, especially in urban environments.


Sorption capacity Biochar Trace metals Deicing salts Urban soil 



The authors thank the City of Montreal Transport Department for providing the financial support for this study and Hélène Lalande for the time and effort she has given to support the laboratory work. Equally noteworthy is the Direction des travaux publics, division voirie et parcs Arrondissement de Côte-des-Neiges-Notre-Dame-de-Grâce for providing the wood chips used in this project.


  1. Asai, H., Samson, B. K., Stephan, H. M., Songyikhangsuthor, K., Homma, K., Kiyono, Y., Inoue, Y., Shiraiwa, T., & Horie, T. (2009). Biochar amendment techniques for upland rice production in Northern Laos: 1. Soil physical properties, leaf SPAD and grain yield. Field Crops Research, 111(81–84), 1–2.Google Scholar
  2. Backstrom, M., Karlsson, S., Backman, L., Folkeson, L., & Lind, B. (2004). Mobilisation of heavy metals by deicing salts in roadside environments. Water Research, 38, 720–732.CrossRefGoogle Scholar
  3. Bauske, B., & Goetz, D. (1993). Effects of de-icing salts on heavy metal mobility. Acta Hydrochimica et Hydrobiologica., 21(1), 38–42.CrossRefGoogle Scholar
  4. Beesley, L., Moreno-Jiménez, E., Gomez-Eyles, J. L., Harris, E., Robinson, B., & Sizmur, T. (2011). A review of biochars’ potential role in the remediation, revegetation and restoration of contaminated soils. Environmental Pollution, 159(12), 3269–3282.CrossRefGoogle Scholar
  5. Beesley L, Moreno-Jiménez E, Gomez-Eyles JL, Harris E, Robinson B, Sizmur T. 2013. Chapter 4, The potential of biochar amendments to remediate contaminated soils, Biochar and soil biota. CRC Press; 100–133.Google Scholar
  6. Bloomfield, C., & Sanders, J. R. (1977). The complexing of copper by humified organic matter from laboratory preparations, soil and peat. European Journal of Soil Science., 28(3), 435–444.CrossRefGoogle Scholar
  7. Bradl, H. B. (2004). Adsorption of heavy metal ions on soils and soils constituents. Journal of Colloid and Interface Science, 277, 1–18.CrossRefGoogle Scholar
  8. Byrne, C. E., & Nagle, D. C. (1997). Carbonized wood monoliths—characterization. Carbon, 35, 267–273.CrossRefGoogle Scholar
  9. Cain NP, Hale B, Berkelaar E and Morin D. 2001. Critical review of effects of NaCl and other road salts on terrestrial vegetation in Canada. Report submitted to the Environment Canada CEPA Priority Substances List Environmental Resource Group on Road Salts. July 2001. Existing substances branch, Environment Canada, Hull, Quebec.Google Scholar
  10. Canadian Environmental Quality Guidelines (CEQG): water quality guideline for the protection of aquatic life. 2014. Winnipeg (MB). Canadian Council of Ministers of the Environment (CCME) [accessed 2017 Apr 24].,71,124,200,229&chapters=1
  11. Cao, X., Ma, L., Liang, Y., Gao, B., & Harris, W. (2011). Simultaneous immobilization of lead and atrazine in contaminated soils using dairy-manure biochar. Environmental Science and Technology, 45L, 4884–4889.CrossRefGoogle Scholar
  12. Chai, Y., Currie, R. J., Davis, J. W., Wilken, M., Martin, G. D., Fishman, V. N., & Ghosh, U. (2012). Effectiveness of activated carbon and biochar in reducing the availability of polychlorinated dibenzo-p-dioxins/dibenzofurans in soils. Environmental Science and Technology., 46(2), 1035–1043.CrossRefGoogle Scholar
  13. Clark, S. E., & Pitt, R. (2007). Influencing factors and a proposed evaluation methodology for predicting groundwater contamination potential from stormwater infiltration activities. Water Environment Research., 79(1), 29–36.CrossRefGoogle Scholar
  14. Cunningham, M. A., Snyder, E., Yonkin, D., Ross, M., & Elsen, T. (2008). Accumulation of deicing salts in soils in an urban environment. Urban Ecosystems., 11(1), 17–31.CrossRefGoogle Scholar
  15. Davis, A. P., & Bhatnagar, V. (1995). Adsorption of cadmium and humic acid onto hematite. Chemosphere, 30, 243–256.CrossRefGoogle Scholar
  16. Davis, A. P., Shokouhian, M., & Ni, S. (2001). Loading estimates of lead, copper, cadmium, and zinc in urban runoff from specific sources. Chemosphere, 44, 997–1009.CrossRefGoogle Scholar
  17. Elkhatib, E. A., Elshebiny, G. M., & Balba, A. M. (1991). Lead sorption in calcareous soils. Environmental Pollution., 69(4), 269–276.CrossRefGoogle Scholar
  18. Fahr, M., Laplaze, L., Bendaou, N., Hocher, V., Mzibri, B., & Smouni. (2013). Effect of lead on root growth. Frontiers in Plant Science., 4, 175.CrossRefGoogle Scholar
  19. Fein, J. B., Boily, J. F., Güçlü, K., & Kaulbach, E. (1999). Experimental study of humic acid adsorption onto bacterial and Al-oxide mineral surfaces. Chemical Geology., 162(1), 33–45.CrossRefGoogle Scholar
  20. Fellet, G., Marchiol, L., Delle Vedove, G., & Pressotti, A. (2011). Application of biochar on mine tailings: effects and perspectives for land reclamation. Chemosphere, 83(9), 1262–1267.CrossRefGoogle Scholar
  21. Forján, R., Asensio, V., Rodriguez-Vila, A., & Covelo, E. F. (2016). Contributions of a compost-biochar mixture to the metal sorption capacity of a mine tailing. Environmental Science and Pollution Research International., 23(3), 2596–2602.CrossRefGoogle Scholar
  22. Gao, X., & Wu, H. (2014). Aerodynamic properties of biochar particles: effect of grinding and implications. Environmental Science & Technology Letters., 1(1), 60–64.CrossRefGoogle Scholar
  23. Gonzalez, M. E., Romero-Hermoso, L., Gonzalez, A., Hidalgo, P., Meier, S., Navia, R., & Cea, M. (2017). Effects of pyrolysis condition on physicochemical properties of oat hull derived biochar. BioResources, 12(1), 2040–2057.CrossRefGoogle Scholar
  24. Hendershot WH, Lalande H, Reyes D, MacDonald JD. 2008. Trace element assessment. In Soil sampling and methods of analysis. Second edition. Lewis Publishers, Canadian Society of Soil Science. p.109–119.Google Scholar
  25. Houben, D., Evrad, L., & Sonnet, P. (2013). Mobility, bioavailability and pH-dependent leaching of cadmium, zinc and lead in a contaminate soil amended with biochar. Chemosphere, 92(11), 1450–1457.CrossRefGoogle Scholar
  26. Huber, M., Welker, A., & Helmreich, B. (2016). Critical review of heavy metal pollution of traffic area runoff: occurrence, influencing factors and partitioning. Science of the Total Environment., 514, 895–919.CrossRefGoogle Scholar
  27. Jim, C. Y. (1998). Physical and chemical properties of a Hong Kong roadside soil in relation to urban tree growth. Urban Ecosystems., 2, 171–181.CrossRefGoogle Scholar
  28. Kargar, M., Clark, O. G., Hendershot, W. H., Jutras, P., & Prasher, S. O. (2015). Immobilization of trace metals in contaminated urban soil amended with compost and biochar. Water, Air and Soil Pollution., 226, 12.CrossRefGoogle Scholar
  29. Kargar, M., Clark, O. G., Hendershot, W. H., Jutras, P., & Prasher, S. O. (2016). Bioavailability of Na and trace metals under direct and indirect effects of compost in urban soils. Journal of Environmental Quality., 45, 1003–1012.CrossRefGoogle Scholar
  30. Keiluweit, M., Nico, P. S., Johnson, M. G., & Kleber, M. (2010). Dynamic molecular structure of plant biomass-derived black carbon. Environmental Science and Technology., 44(4), 1247–1253.CrossRefGoogle Scholar
  31. Klasson, K. T., Uchimiya, M., & Lima, I. M. (2010). Uncovering surface area and micropores in almond shell biochars by rainwater wash. Chemosphere, 111, 129–134.CrossRefGoogle Scholar
  32. Kloss, et al. (2012). Characterization of slow pyrolysis biochars: effects of feedstocks and pyrolysis temperature on biochar properties. Journal of Environmental Quality., 41(4), 990–1000.CrossRefGoogle Scholar
  33. Lehmann, J., Pereira da Silva, J., Steiner, C., Nehls, T., Zech, W., & Glaser, B. (2003). Nutrient availability and leaching in an archaeological Anthrosol and a Ferralsol of the Central Amazon basin: fertilizer, manure and charcoal amendments. Plant and Soil, 249, 343–357.CrossRefGoogle Scholar
  34. Lehmann, J., Gaunt, J., & Rondon, M. (2006). Biochar sequestration in terrestrial ecosystems—a review. Mitigation and Adaptation Strategies for Global Change., 11(2), 395–419.CrossRefGoogle Scholar
  35. Li, X., Liu, L., Wang, Y., Luo, G., Chen, X., Yang, X., Hall, M. H. P., Guo, R., Wang, H., Cui, J., & He, X. (2013). Heavy metal contamination of urban soil in an old industrial city (Shenyang) in Northeast China. Geoderma, 192, 50–58.CrossRefGoogle Scholar
  36. Li, F., Zhang, Y., Fan, Z., & Oh, K. (2015). Accumulation of de-icing salts and its short-term effect on metal mobility in urban roadside soils. Bulletin of Environmental Contamination and Toxicology., 94, 525–531.CrossRefGoogle Scholar
  37. Liang, B., Lehmann, J., Solomon, D., Kinyangi, J., Grossman, J., O’Neill, B., Skjemstad, J. O., Thies, J., Luizao, F. J., Petersen, J., & Neves, E. G. (2006). Black carbon increases cation exchange capacity in soil. Soil Science Society of America., 70(5), 1719–1730.CrossRefGoogle Scholar
  38. Lindsay WL. 1979. Chemical equilibria in soil. Wiley. Chapter 13, Zinc; p. 210-216.Google Scholar
  39. Luo, X. S., Yu, S., & Li, X. D. (2012). The mobility, bioavailability, and human bioaccessibility of trace metals in urban soils of Hong Kong. Applied Chemistry., 27, 995–1004.Google Scholar
  40. McBride, M. B. (1994). Environmental chemistry of soils. New York: Oxford University Press.Google Scholar
  41. McGrath, S. P., Sanders, J. R., & Shalaby, M. H. (1998). The effects of soil organic matter levels on soil solution concentrations and extractabilities of manganese, zinc, and copper. Geoderma, 42(2), 177–188.CrossRefGoogle Scholar
  42. McKenzie, E. R., Money, J. E., Green, P. G., & Young, T. M. (2009). Metals associated with stormwater relevant brake and tire sample. The Science of the Total Environment., 407(22), 5855–5860.CrossRefGoogle Scholar
  43. Namgay, T., & Singh, B. (2010). Influence of biochar application to soil on the availability of As, Cd, Cu, Pb and Zn to maize (Zea mays L.) Australian Journal of Soil Research, 48, 638–647.CrossRefGoogle Scholar
  44. Neal, R. H., & Sposito, G. (1986). Effects of soluble organic matter and sewage sludge amendments on cadmium sorption by soils at low cadmium concentrations. Soil Science., 142(3), 164–172.CrossRefGoogle Scholar
  45. Nelson, S. S., Yonge, D. R., & Barber, M. E. (2009). Effects of road salts on heavy metal mobility in two eastern Washington soils. Journal of Environmental Engineering., 135(7), 505–510.CrossRefGoogle Scholar
  46. Norrström, A. C., & Bergstedt, E. (2001). The impact of road de-icing salts (NaCl) on colloid dispersion and base cation pools in roadside soils. Water, Air and Soil Pollution., 127(1), 281–299.CrossRefGoogle Scholar
  47. Qian, L., & Chen, B. (2013). Dual role of biochars as adsorbents for aluminum: the effects of oxygen-containing organic components and the scattering of silicate particles. Environmental Science and Technology., 47, 8759–8768.Google Scholar
  48. Reddy, M. R., & Perkins, H. F. (1974). Fixation of zinc by clay minerals. Soil Science Society of America., 38(2), 229–231.CrossRefGoogle Scholar
  49. Reddy, M. R., & Perkins, H. F. (1976). Fixation of manganese by clay minerals. Soil Science., 191, 21–24.CrossRefGoogle Scholar
  50. Santillan-Medrano, J., & Jurinak, J. J. (1975). The chemistry of lead and cadmium in soil: solid phase formation. Soil Science Society of America Journal., 39, 851–856.CrossRefGoogle Scholar
  51. Sun, J., He, F., Yinghua, P., & Zhang, Z. (2016). Effects of pyrolysis temperature and residence time on physicochemical properties of different biochar types. Acta Agriculturae Scandinavica, Section B—Soil & Plant Science., 67(1), 12–22.CrossRefGoogle Scholar
  52. Tiller, K. G., & Hodgson, J. F. (1962). The specific sorption of cobalt and zinc by layer silicates. Clays and Clay Minerals, 9, 393–303.CrossRefGoogle Scholar
  53. Tonutare T, Krebstein K, Utso M, Rodima A, Kolli R, Shanskiy M. 2014. Biochar contribution to soil pH buffer capacity. EGU general assembly. Volume 16.Google Scholar
  54. Uchimiya, M., Wartelle, L. H., Klasson, K. T., Fortier, C. A., & Lima, I. M. (2011). Influence of pyrolysis temperature on biochar property and function as a heavy metal sorbent in soil. Journal of Agricultural and Food Chemistry, 59, 2501–2510.CrossRefGoogle Scholar
  55. Wuana RA, Okieimen FE. 2011. Heavy metals in contaminated soils: a review of sources, chemistry, risks and best available strategies for remediation. International Scholarly Research Notices. 2011: 20 pages.Google Scholar
  56. Yu, Z., Qiu, W., Wang, F., Lei, M., Wang, D., & Song, Z. (2017). Effects of manganese oxide-modified biochar composites on arsenic speciation and accumulation in an indica rice (Oryza sativa L.) cultivar. Chemosphere, 168, 341–349.CrossRefGoogle Scholar
  57. Zhang, J., Liu, J., & Liu, R. (2015). Effects of pyrolysis temperature and heating time on biochar obtained from the pyrolysis of straw and lignosulfonate. Bioresource Technology., 176, 288–291.CrossRefGoogle Scholar
  58. Zhang, M. K., He, Z. L., Calvert, D. V., & Stoffella. (2006). Extractability and mobility of copper and zinc accumulate in sandy soils. Pedosphere, 16(1), 43–49.CrossRefGoogle Scholar
  59. Zheng, W., Guo, M., Chow, T., Bennett, D. N., & Rajagopalan, N. (2010). Sorption properties of greenwaste biochar for two triazine pesticides. Journal of Hazardous Materials., 181(1–3), 121–126.CrossRefGoogle Scholar
  60. Zimmerman AR, Gao B. 2013. Chapter 1, The stability of biochar in the environment, Biochar and soil biota. CRC Press. p.1–40.Google Scholar

Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • Rose Seguin
    • 1
  • Maryam Kargar
    • 1
  • Shiv O. Prasher
    • 1
  • O. Grant Clark
    • 1
  • Pierre Jutras
    • 1
  1. 1.McGill UniversitySainte-Anne-de-BellevueCanada

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