Role of Biochar for Soil Remediation and Ameliorating Salinity Effects

*Applications of Biochar for Environmental Safety*

USA: Soil Science Society of America; 2016. pp. 1-14. SSSA Spec. Publ. 63

Agricultural and Environmental Applications of Biochar: Advances and Barriers. Madison, WI, USA: Soil Science Society of America; 2016. pp. 123-144. SSSA Spec. Publ. 63

[67] Tian J, Miller V, Chiu PC, Maresca JA, Guo M, Imhoff PT. Nutrient release and ammonium sorption of poultry litter and wood biochars in stormwater treatment. Science of The Total Environment.

[68] Paz-Ferreiro J, Mendez A, Gasco G. Application of biochar for soil biological

Uchimiya SM, editors. Agricultural and Environmental Applications of Biochar: Advances and Barriers. Madison, WI, USA: Soil Science Society of America; 2016. pp. 145-174. SSSA Spec. Publ. 63

improvement. In: Guo M, He Z,

[69] Lehmann J, Rillig MC, Thies J, Masiello CA, Hockaday WC, Crowley D. Biochar effects on soil biota—A review. Soil Biology and Biochemistry. 2011;**43**:1812-1836

[70] Arfaoui A, Ibrahimi K, Trabelsi F. Biochar application to soil under arid conditions: A bibliometric study of research status and trends. Arabian Journal of Geosciences. 2019;**12**:45

2016;**553**:596-606

[60] Guo M, Xiao P, Li H. Valorization of agricultural byproducts through conversion to biochar and bio-oil. In: Simpson BK, Kwofie EM, Aryee AN, editors. Byproducts from Agriculture and Fisheries: Adding Value for Food, Feed, Pharma and Fuels. Somerset, NJ, USA: John Wiley & Sons, Inc.; 2020.

[61] Sigua GC, Novak JM, Watts DW, Johnson MG, Spokas K. Efficacies of designer biochars in improving biomass and nutrient uptake of winter wheat grown in a hard setting subsoil layer. Chemosphere. 2016;**142**:176-183

[62] Zhang Y, Idowu OJ, Brewer CE. Using agricultural residue biochar to improve soil quality of desert soils.

Agriculture. 2016;**6**(1):10

Agronomie. 2017;**7**:6

2018;**41**(3):517-523

[63] Blok C, van der Salm C, Hofland-Zijlstra J, Streminska M, Eveleens B, Regelink I, et al. Biochar for horticultural rooting media improvement: Evaluation of biochar from gasification and slow pyrolysis.

[64] Luo X, Liu G, Xia Y, Chen L, Jiang Z, Zheng H, et al. Use of biocharcompost to improve properties and productivity of the degraded coastal soil in the YellowRiver Delta, China. Journal of Soils and Sediments. 2017;**17**:780-789

[65] Zheng H, Wang X, Chen L,

[66] Igalavithana AD, Ok YS, Usman ARA, Al-Wabel MI, Oleszczuk P, Lee SS. The effects of biochar amendment on soil fertility. In: Guo M, He Z, Uchimiya SM, editors.

Wang Z, Xia Y, Zhang Y, et al. Enhanced growth of halophyte plants in biocharamended coastal soil: Roles of nutrient availability and rhizosphere microbial modulation. Plant Cell Environment.

pp. 501-522

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**177**

**1. Introduction**

**Chapter 11**

**Abstract**

The Use of Biochar as a

*João Arthur Antonangelo and Hailin Zhang*

Phytoavailability

Soil Amendment to Reduce

Potentially Toxic Metals (PTMs)

The contamination of potentially toxic metals (PTMs) is widespread in the world and has negatively affected plants, humans, soil health, and environmental quality. Some metals are essential plant nutrients but they are also toxic to vegetation and aquatic live when present in high concentrations, such as Cu, Mn and Zn. Others (e.g., Pb, Cd, Cr, and As) are potential toxic metals for all organisms, and are not needed (or are toxic) for plant growth. This chapter summarizes the use of readily available biochars (BCs) to reduce PTMs phytoavailability in soils thus improving crop yields and to minimize its impact on the environment. The physicochemical and morphological properties of BCs as affected by feedstock sources and pyrolysis temperatures are discussed. The effectiveness of biochar rates on plant growth and metal fractions are also highlighted. Biochar has the potential to be used as a viable bioproduct for the remediation of contaminated soils since it reduces the phytoavailability of PTMs pollutants. Biochars produced from different feedstocks and at different pyrolysis temperatures present highly heterogeneous physicochemical and morphological properties, which can affect the effectiveness in the remediation of PTMs contaminated soils. Therefore, potential technologies need to be developed and research gaps still need to be overcome to optimize the use of BCs

as a feasible alternative for remediation of metal contaminated soils.

carbon (C) in soil physical, chemical and biological processes [10].

phytoavailability, immobilization, soil health

**Keywords:** soil remediation, biochar amendment, potentially toxic metals,

Biochar is a carbon-rich by-product produced from the thermochemical conversion of biomass feedstock under partial or total absence of oxygen [1, 2]. Feedstocks used in biochar (BC) production are mostly wood, municipal and agriculture wastes [3–6]. Amending soil with biochar has received increased attention as a method for carbon sequestration in soils, thereby reducing carbon dioxide (CO2) emissions [7–9] and improving soil quality due to the vital role of
