Effect of digestate and digestate supplemented with biochar on switchgrass growth and chemical composition

Lee, Moon Sub; Urgun‐Demirtas, Meltem; Shen, Yanwen; Zumpf, Colleen; Rayburn, A. Lane; Lee, D. K.

doi:10.1016/j.biombioe.2020.105928

Cited by 18 publications

(4 citation statements)

References 55 publications

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“…Despite the differences in the soil nutrient content, no significant differences in dry AGB were detectable among the treatments. On the other hand, the fresh and dry root biomass were increased by the amendment of modified digestates used here, most significant positive effect showed BC treatment, as already reported [59], and BC + S treatment exerting high TC, C:N, MBC values.…”

Section: Soil Nutrients Microbial Abundance and Plant Biomasssupporting

confidence: 84%

Biochar and Sulphur Enriched Digestate: Utilization of Agriculture Associated Waste Products for Improved Soil Carbon and Nitrogen Content, Microbial Activity, and Plant Growth

et al. 2021

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A number of agriculture residues may be used either directly or after suitable treatment as amendments to improve soil quality. Such materials include biochar made of agriculture residues, digestate or elemental sulphur obtained from biogas desulphurisation. The joint use of these materials via pre-incubation may be more advantageous than only mixing prior the application to soil. In this study, digestates were mixed with amendments and incubated for 6 weeks before application to soil in a short-term pot experiment with lettuce (Lactuca sativa). The following treatments were tested: control digestate, digestate + biochar, digestate + elemental sulphur, digestate + biochar + elemental sulphur. The biochar-enriched digestate significantly increased soil microbial biomass, soil C:N, fresh above ground biomass, fresh and dry root biomass. Elemental sulphur-enriched digestate caused highest arylsulfatase and phosphatase, increased urease, microbial biomass in soil and fresh root biomass. Amendment of digestate + biochar + sulphur led to the significantly highest total soil carbon, microbial biomass, β-glucosidase, urease, and increased C:N ratio, arylsulfatase in soil and root biomass. It mitigated the adverse effect of either biochar or elemental sulphur on soil respiration. Properties of digestates were apparently affected by pre-incubation. This approach in digestate fertilizer production may contribute to sustainable farming.

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Section: Soil Nutrients Microbial Abundance and Plant Biomasssupporting

confidence: 84%

Biochar and Sulphur Enriched Digestate: Utilization of Agriculture Associated Waste Products for Improved Soil Carbon and Nitrogen Content, Microbial Activity, and Plant Growth

et al. 2021

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“…Digestate produced in biogas plants can be a viable option for sustainable semiliquid fertilizer used on grasslands. Digestate, as a byproduct of anaerobic digestion, comprises small amounts of ammonia, sulphate, and trace elements, which makes digestate a notable source of nutrients essential for biomass production [6][7][8]. A study by Walsch suggested that its effect on biomass production is equivalent to that of a mineral fertilizer [9].…”

Section: Introductionmentioning

confidence: 99%

Does Digestate Dose Affect Fodder Security and Nutritive Value?

et al. 2022

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With the rising interest in digestate use as a fertilizer on permanent cultures, there is a need to examine its effects on food and feed quality. This study is focused on the use of digestate in grassland fertilization and its effects on nutritive value parameters such as mycotoxin contamination (deoxynivalenol, aflatoxin, and T-2 toxin) and nutrient content (crude protein, crude fat, crude fiber, ash, nitrogen-free extract, digestibility of organic matter, acid detergent fiber, and ash-free neutral detergent fiber). The experiment was carried out in the Czech Republic, and the effects of fertilization regime, year, and harvest date (summer and fall cuts) on nutritive value were observed. An effect of the year on DON, AFB1, and T-2 contamination levels was observed. An effect of the harvest or fertilization regime on mycotoxin contamination was not observed. Significant differences were observed in the content of all nutrients, except ash, depending on the year. Differences were found only in the case of ADF levels, depending on the harvest date, as well; however, no differences were found between fertilization regimes. Our findings suggest that digestate does not negatively affect fodder in terms of nutritive value nor safety.

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“…The quality of digestate varies significantly between biogas plants, used technology, substrate, and post-treatment methods. The most important macronutrients (N, P, K) may vary in broad ranges, 24,597-204,984 mg×kg TS ; and 119-81,028 mg×kg TS −1 , respectively (Pivato et al, 2016;Ehmann et al, 2018;Lee et al, 2021;Czekała et al, 2022). The quality of process residues (digestate) depends on the quality of the used substrate and process performance.…”

Section: Discussionmentioning

confidence: 99%

Anaerobic digestion of brewer’s spent grain with biochars—biomethane production and digestate quality effects

2023

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In this research, biochar (BC) made from the brewer’s spent grain at temperatures of 300, 450, and 600 °C was produced and subjected to the anaerobic digestion of the brewer’s spent grain. BC shares of 2, 5, 10, and 50% concerning total solids of the substrate were tested at three substrate-to-inoculum ratios of 0.5, 1.0, and 2.0, respectively. The anaerobic digestion process was performed at 37 °C and took 30 days. For anaerobic digestion, biomethane production was recorded and used for kinetics parameter determination according to the first-order model. After the process, process residues (digestate) were analyzed for fertilizing potential. The biomethane yield differs from 264 to 325 mL×gvs−1, while kinetics parameters were 292.7–344.7 mL×gvs−1, 0.08–0.11 d−1, and 24–42.5 mL×(gvs×d)−1, for ymax, k, and r, respectively. The main factors affecting biomethane production were substrate-to-inoculum ratio and BC share. No specific effect between BC types on biomethane yield was found. An increase in BC share from 2% to 50% concerning specific SIR results in biomethane production improvement in the range of 1.8% to 10%. The main factors affecting the quality of digestate (nutrients) were the quality of the used inoculum and the quantity of the used substrate. The research results were complex and showed that the final effect of BC supplementation depends not only on BC properties, but also on process operational parameters and the quality of the used feedstock.

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Effect of digestate and digestate supplemented with biochar on switchgrass growth and chemical composition

Cited by 18 publications

References 55 publications

Biochar and Sulphur Enriched Digestate: Utilization of Agriculture Associated Waste Products for Improved Soil Carbon and Nitrogen Content, Microbial Activity, and Plant Growth

Biochar and Sulphur Enriched Digestate: Utilization of Agriculture Associated Waste Products for Improved Soil Carbon and Nitrogen Content, Microbial Activity, and Plant Growth

Does Digestate Dose Affect Fodder Security and Nutritive Value?

Anaerobic digestion of brewer’s spent grain with biochars—biomethane production and digestate quality effects

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