Studies​

Science powers our mission to capture and store carbon while creating fertile soil

Oxidation-alkaline-enhanced abiotic humification valorizes lignin-rich biogas digestate into artificial humic acids

This study presents a novel approach for producing artificial humic acids (A-ASs) from lignin-rich biogas digestate using a cost-effective and sustainable method called oxidation-enhanced alkaline humification.This method utilizes MnO2, KOH, and urea to facilitate the breakdown of lignin and its conversion into A-ASs, achieving a high yield of 32.15%, a carboxylic acid content of 3.325 mmol/g, and 65% lignin removal under optimal conditions.This process not only offers a solution for managing lignin-rich waste but also produces valuable A-ASs with favorable characteristics, such as a lower molecular weight, reduced toxicity, and enhanced functionality, making them suitable for various applications in sustainable agriculture and environmental management.

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Sustainable leaching process of phosphates from animal bones to alleviate the world phosphate crisis

A new study, as described in the source, outlines a hydrothermal humification (HTH) process for converting animal bones from kitchen waste into fertilizer. This process uses artificial humic acid (A-HA), created in situ during HTH, to break down bone structure and convert insoluble phosphorus into a soluble form, as evidenced by scanning electron microscopy and X-ray diffraction analysis.The study highlights the potential of this method to create a sustainable and hygienic phosphorus cycle by converting a readily available waste product into a usable form for agriculture.

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Artificial humic acid facilitates biological carbon sequestration under freezing-thawing conditions

The study highlights how the application of liquid artificial humic acid (LA-HA) to black soils can significantly enhance carbon sequestration, particularly when combined with freezing-thawing cycles. This effect is primarily attributed to LA-HA’s ability to promote the growth and activity of carbon-sequestering bacteria, such as Mycolicibacterium gadium and Starkeya novella, which convert labile carbon into more resistant forms like microbial necromass. Additionally, the study found that LA-HA can increase the content of stable carbon components in soil, further contributing to long-term carbon storage and mitigating carbon loss.

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The sleeping giant – a polymer view on humic matter in synthesis and applications
Humic substances (HS) are a complex class of organic polymers found naturally in soil or synthesized from biomass (A-HS), and they play a crucial role in soil health and agricultural productivity. As highlighted in the sources, HS are characterized by their ability to bind metal ions, improve soil structure, enhance nutrient availability, and promote plant growth, making them valuable for soil amendment and remediation. The sources further explore the potential of A-HS, particularly in addressing global challenges like climate change, with their ability to enhance carbon sequestration in soil by promoting the growth of carbon-fixing bacteria and the formation of stable organo-mineral complexes.
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Artificial humic substances as sustainable carriers for manganese: Development of a novel bio-based microfertilizer

This scientific research article, published in the Biofuel Research Journal, details the development of a novel bio-based microfertilizer using artificial humic substances (A-HS) derived from poplar bark. The authors outline a hydrothermal treatment method to synthesize A-HS with varying manganese concentrations. Their results demonstrate that manganese preferentially binds to the high-molecular-weight fraction of A-HS, with a 5% manganese concentration (A-HS-Mn5) achieving optimal loading without significantly impacting A-HS solubility.

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Moderating carbon dynamics in black soil by combined application of biochar and an artificial humic substance
This study investigates the combined effects of biochar and an artificial humic substance (A-HS) on carbon dynamics in black soil, particularly focusing on the mineralization and stabilization of soil organic matter (SOM). The research involved a 180-day incubation experiment simulating weather events like freezing, thawing, and warming, analyzing the impact of separate and mixed applications of biochar and A-HS on SOM content, microbial community structure, and soil properties. The findings suggest that while A-HS initially enhances SOM mineralization, especially during freezing periods, it ultimately promotes the formation of more stable humic substances, potentially counteracting SOM loss in warming climates, particularly when combined with biochar.
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Artificial humic acid improves maize growth and soil phosphorus utilization efficiency

The Study focuses on the application of artificial humic acid (A-HA) derived from leonardite, investigating its impact on maize growth and phosphorus utilization efficiency in a greenhouse setting. The research examines the effects of varying A-HA concentrations on maize biomass, phosphorus uptake, and the activity of soil enzymes related to phosphorus cycling, such as alkaline phosphatase. The quantitative results from the study allowed the authors to suggests that A-HA application can potentially enhance phosphorus availability and uptake by maize plants, ultimately contributing to improved growth and yield.

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Anthropogenic soil as an environmental material, as exemplified with improved growth of rice seedlings
The research in the source presents a novel method for producing “anthropogenic soil” (AS), a synthetic soil substitute, by combining weak soil with the products created from rice straw and potassium hydroxide (KOH) using a hydrothermal humification-hydrothermal carbonization (HTH-HTC) process to obtain “artificial black soil” (ABS). This engineered soil demonstrates promising results in promoting rice seedling growth due to its ability to retain water, enhance nutrient availability (particularly ammonium nitrogen), and foster a thriving microbial community. The study suggests that AS, by replicating key characteristics of natural fertile soil, offers a potential solution to land degradation and could contribute to more sustainable agriculture.
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Artificial humic acid mediated carbon–iron coupling to promote carbon sequestration

Artificial humic acid (A-HA) can significantly enhance carbon sequestration in soil by promoting the formation of organo-mineral complexes, particularly with iron (Fe) (hydr)oxides. This process involves A-HA binding with Fe (hydr)oxides, creating stable aggregates that protect organic carbon from decomposition. Moreover, A-HA facilitates the crystallization of more stable Fe (hydr)oxide forms, such as goethite and hematite, further contributing to long-term carbon storage. This A-HA mediated carbon-iron conjugation offers a promising approach to enhance carbon sequestration and mitigate carbon loss

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Artificial humic substances improve microbial activity for binding CO2

Artificial humic substances (A-HS) show great potential for increasing carbon sequestration in black soils by promoting microbial growth, specifically Rubrivivax gelatinosus, which leads to a significant increase in total organic carbon (TOC). This increase in TOC, up to 70 times the added A-HS carbon after 28 days, highlights the biological amplification driven by A-HS addition, surpassing the carbon fixation capacity of higher plants. Furthermore, A-HS application improves soil fertility by enhancing nutrient availability, including exchangeable base cations and available phosphorus, contributing to the overall improvement of black soils.

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