Influence of pyrolysis parameters on phosphorus fractions of biosolids derived biochar

Adhikari, Sirjana; Gascó, Gabriel; Méndez, Ana; Surapaneni, Aravind; Jegatheesan, Veeriah; Shah, Kalpit; Paz‐Ferreiro, Jorge

doi:10.1016/j.scitotenv.2019.133846

Cited by 107 publications

(67 citation statements)

References 51 publications

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“…Whilst assessing a change point was not within the scope of this study, there was a potential for the MCP treatment to result in excessive P leaching. With respect to the biochars and NTS amendments, the treatments did not lead to a statistically significant change in Olsen P, which aligns with previous studies reporting that P-rich biochars tend to act as a slow-release source of P [19,28].…”

Section: Resultssupporting

confidence: 89%

Using Phosphorus-Rich Biochars to Remediate Lead-Contaminated Soil: Influence on Soil Enzymes and Extractable P

et al. 2020

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In recent times, there has been increased focus on a holistic approach to soil remediation with consideration of social, economic and environmental factors. Consequently, there is a demand from practitioners and regulators alike for suitable ways to measure ancillary outcomes, for example, effects on soil quality. Here we show that biochar, when applied to land to remediate lead (Pb)-contaminated soils, can lead to environmental improvements not realized by adding mined or manufactured phosphates. Here, we study a Pb-contaminated soil amended with two phosphate fertilizers (slow- and fast-release) and with biochars produced from poultry litter and from biosolids at three temperatures (300 °C, 400 °C and 500 °C). The results show that, unlike the fast-release P fertilizer, biochars did not result in an increase in the amount of leachable P that could be released into the environment. Biochars prepared at 500 °C presented a higher value of the integrative geometric mean of soil enzyme activity, compared to the P fertilizers. Overall, our research shows that biochars, particularly those prepared at the higher temperature tested, are a suitable alternative to P fertilizers as an integrative remediation strategy in Pb-contaminated soils, enabling soil biological restoration.

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Section: Resultssupporting

confidence: 89%

Using Phosphorus-Rich Biochars to Remediate Lead-Contaminated Soil: Influence on Soil Enzymes and Extractable P

et al. 2020

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“…The ability to make micronutrients available during the SSBC residual effect period allows it to be classified as a source of slow‐release micronutrient. In previous studies, SSBC has been described as a slow‐release nitrogen (Paneque, de la Rosa, Kern, Reza, & Knicker, 2017) and phosphorus fertilizer (Adhikari et al., 2019; Glaser & Lehr, 2019).…”

Section: Resultsmentioning

confidence: 99%

Long‐term effects of sewage sludge–derived biochar on the accumulation and availability of trace elements in a tropical soil

et al. 2020

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Thermal treatment by pyrolysis has been proposed as a sustainable alternative to enable the agricultural use of sewage sludge. The solid product obtained via pyrolysis of sewage sludge is called sewage sludge biochar and presents several advantages for its use as a fertilizer or soil conditioner. However, there are concerns about the accumulation and dynamics of trace elements in soil amended with sewage sludge biochar over the years. This study examined the effect of sewage sludge biochar, under field conditions for 5 yr, on the accumulation and availability of trace elements in a tropical soil. For this, 15 t ha–1 of sewage sludge biochar produced at 300 and 500 °C were applied in the first two growing seasons. Application was interrupted from the third to the fifth seasons to assess the residual effect of sewage sludge biochar in the soil. The total and available trace element concentrations were determined. The total contents of trace elements showed the following variation in the soil over the 5 yr (mg kg–1): Cd (16.8–20.0), Co (19.5–21.5), Cr (98.2–125.7), Cu (8.1–17.1), Mn (62.9–85.7), Ni (20.3–35.0), Pb (27.0–52.4), and Zn (20.3–35.8). There was no change in the availability of Cd, Cr, Ni, and Pb over the years. Additionally, a residual effect of the sewage sludge biochar was the increase in availability of trace elements that are considered essential (Cu, Mn, and Zn) and beneficial elements (Co) for plants. Therefore, in relation to contamination by trace elements, the pyrolysis of sewage sludge of domestic origin proved to be an adequate strategy to enable the safe use of this residue in tropical agriculture.

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“…Even manure-derived biochars (e.g., from pig manure solids, cow manure, and poultry litter) contained total N <4.2% and total P <3.2% [10,14,40]. Manure-and animal bones-derived biochars may contain plant nutrients (e.g., P, K, Ca, S, B, Zn, and Cu) at considerable levels [10,41,42] and function as a supplemental nutrient source to crops. The fertilization effect of biochar through releasing the inherent nutrients, however, is temporary, diminishing over time and being inevident after one or a few growing seasons.…”

Section: The Mechanisms For Biochar To Improve Soil Healthmentioning

confidence: 99%

“…Yield and quality variations of biochar as a function of the feedstock and production conditions[13,42,[49][50][51].…”

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The 3R Principles for Applying Biochar to Improve Soil Health

Guo

2020

Soil Systems

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Amending soil with biochar is a promising approach to persistently improve soil health and promote crop growth. The efficacy of soil biochar amendment, however, is soil specific, biochar dependent, and influenced by the biochar application programs. To maximize the benefits of biochar application, this paper proposes the 3R principles for applying biochar to soils: right biochar source, right application rate, and right placement in soil. The quality of biochar as a soil amendment varies significantly with the feedstock and the production conditions. Biochar products capable of everlastingly sustaining soil health are those with high stable organic carbon (OC) content and high water- and nutrient-holding capacities that are manufactured from uncontaminated biomass materials. Acidic, coarse-textured, highly leached soils respond remarkably more to biochar amendment than other types of soils. Soil amendment with particular biochars at as low as 0.1 mass% (equivalent to 2 Mg ha−1) may enhance the seasonal crop productivity. To achieve the evident, long-term soil health improvement effects, wood- and crop residue-derived biochars should be applied to soil at one time or cumulatively 2–5 mass% and manure-derived biochars at 1–3 mass% soil. Optimal amendment rates of particular biochar soil systems should be prescreened to ensure the pH of newly treated soils is less than 7.5 and the electrical conductivity (EC) below 2.7 dS m−1 (in 1:1 soil/water slurry). To maximize the soil health benefits while minimizing the erosion risk, biochar amendment should be implemented through broadcasting granular biochar in moistened conditions or in compost mixtures to cropland under low-wind weather followed by thorough and uniform incorporation into the 0–15 cm soil layer. Biochars are generally low in plant macronutrients and cannot serve as a major nutrient source (especially N) to plants. Combined chemical fertilization is necessary to realize the synergic beneficial effects of biochar amendment.

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Influence of pyrolysis parameters on phosphorus fractions of biosolids derived biochar

Cited by 107 publications

References 51 publications

Using Phosphorus-Rich Biochars to Remediate Lead-Contaminated Soil: Influence on Soil Enzymes and Extractable P

Using Phosphorus-Rich Biochars to Remediate Lead-Contaminated Soil: Influence on Soil Enzymes and Extractable P

Long‐term effects of sewage sludge–derived biochar on the accumulation and availability of trace elements in a tropical soil

The 3R Principles for Applying Biochar to Improve Soil Health

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