Effects of Alkali-Activated Algae Biochar on Soil Improvement after Phosphorus Absorption: Efficiency and Mechanism
Open accessAbstract
Biochar is often used for the removal of phosphorus in wastewater. However, the improper treatment of adsorbed biochar might cause secondary pollution. In order to promote the recycling and harmless utilization of biochar with adsorbed phosphorus, a new modified biochar (ABC) was prepared from cyanobacteria in this study. The maximum adsorption capacity of ABC calculated from the Langmuir isotherm model was 38.17 mg·g−1. ABC was used to absorb phosphorus in wastewater, whose product (ABC/P) was used for soil improvement and soybean cultivation. The results showed that adding the proper amount of ABC/P could significantly increase the pH of the soil (from 6.52 ± 0.04 to 7.49 ± 0.08), organic matter content (from 34.02 ± 0.41 to 47.05 ± 0.14 g·kg−1), cation exchange capacity (from 3.01 ± 0.18 to 3.76 ± 0.07 cmol·kg−1), water-holding capacity (from 28.78 ± 0.34 to 35.03 ± 0.31%), effective phosphorus content, and total phosphorus content. Meanwhile, the soil alkaline phosphatase activity was improved. The plant height, root length, and fresh quality were promoted by planting soybeans in ABC/P-improved soil and were better than those of the control group. Therefore, ABC/P, as a new type of phosphorus fertilizer, has the potential for soil amendment for legume crops.
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When incorporated into agricultural practices such as soybean cultivation, ABB has been observed to boost yields by 119%.
“When incorporated into agricultural practices, such as soybean cultivation, ABB has been observed to boost yields by 119% [73].”
From Algal-Based Carbonaceous Materials for Environmental Remediation: Advances in Wastewater Treatment, Carbon Sequestration, and Biofuel Applications (2025) · cites this paper as [73]
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- Authors
- Liu, Y.-N., & He, L.-Y.
- Affiliations
- Huazhong Agricultural University (CN)
- College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
- Venue
- Sustainability
- Publisher
- MDPI AG
- Published
- 2021-10-29
- Volume
- 13
- Issue
- 21
- Pages
- 11973
- ISSN
- 2071-1050 (ISSN-L)
- OpenAlex
- W3209511455
- Cited by
- 7
- References
- 26
- Citations by year
- 2025: 3 · 2024: 2 · 2023: 2
- FWCI
- 0.61
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Sustainability (publishedVersion, cc-by)
- RePEc: Research Papers in Economics (submittedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Topics
- Physical Sciences › Environmental Science › Waste Management and Disposal › Phosphorus and nutrient management
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Agricultural Science and Fertilization
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
- Keywords
- phosphorus adsorption, soil improvement, phosphorus fertilizer, soybean growth, soil organic matter, cation exchange capacity, water holding capacity, soil pH
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