Experimental Study of the Usage of Combined Biopolymer and Plants in Reinforcing the Clayey Soil Exposed to Acidic and Alkaline Contaminations

Ni, Jing; Chen, Jiaqi; Liu, Shuojie; Hao, Gang-Lai; Geng, Xueyu

doi:10.3390/app12125808

Cited by 6 publications

(3 citation statements)

References 70 publications

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“…With no ploughing of green manure plants, the biological measures failed to significantly improve the soil. Therefore, under drought conditions, soil improvement with plant measures is highly dependent on artificial water recharge [ 70 ], which is time-consuming and laborious with little effect [ 71 ].…”

Section: Discussionmentioning

confidence: 99%

Soil quality enhancement by multi-treatment in the abandoned land of dry-hot river valley hydropower station construction area under karst desertification environment

Wu,

Sun,

Chen

et al. 2024

PLoS ONE

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The medium-intensity karst desertification environment is typically characterized by more rocks and less soil. The abandoned land in the construction areas of the dry-hot river valley hydropower station has more infertile soil, severe land degradation, and very low land productivity. Therefore, it is urgent to improve the soil quality to curb the increasingly degrading land and reuse the construction site. Few studies have focused on the effect of soil restoration and comprehensive evaluation of soil quality with multi-treatment in abandoned land in the dry-hot valley hydropower station construction area. Here, 9 soil restoration measures and 1 control group were installed at the Guangzhao Hydropower Station construction in Guizhou Province, China, for physical and chemical property analysis. In total, 180 physical and 90 chemical soil samples were collected on three occasions in May, August, and December 2022. Soil fertility and quality were evaluated under various measures using membership functions and principal component analysis (PCA). This study showed that almost all measures could enhance soil water storage capacity (The average total soil porosity of 9 soil treatments was 57.56%, while that of the control group was 56.37%). With the increase in soil porosity, soil evaporation became stronger, and soil water content decreased. Nevertheless, no decrease in soil water content was observed in the presence of vegetation cover (soil water content: 16.46% of hairy vetch, 13.99% of clover, 13.77% of the control). They also proved that manure, synthetic fertilizer, and straw could promote total and available nutrients (Soil total nutrient content, or the total content of TN、TP、TK,was presented as: synthetic fertilizer (11.039g kg-2)>fowl manure (10.953g kg-2)>maize straw (10.560g kg-2)>control (9.580g kg-2);Total available nutrient content in soil, or the total content of AN,AP,A,was shown as:fowl manure (1287.670 mg kg-1)>synthetic fertilizer (925.889 mg kg-1)>sheep manure (825.979 mg kg-1)>control (445.486 mg kg-1). They could also promote soil fertility, among which the first two reached the higher comprehensive soil quality. Fertilizer was conducive to improve soil quality and fertility, yet long-term application could cause land degradation like soil non-point source pollution, compaction, and land productivity decline. Ultimately, combining fertilizer with biochar or manure is recommended to improve soil fertility. Biochar and green manure could play an apparent role in soil improvement only when there is abundant soil water. The above views provide theoretical support for curbing soil degradation, improving soil fertility and quality, enhancing land productivity, and promoting the virtuous cycle of the soil ecosystem.

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Section: Discussionmentioning

confidence: 99%

Soil quality enhancement by multi-treatment in the abandoned land of dry-hot river valley hydropower station construction area under karst desertification environment

Wu,

Sun,

Chen

et al. 2024

PLoS ONE

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“…A unique approach combining plant growth and amendment of xanthan gum has been suggested for remediation purposes of heavy-metal-contaminated soils by Ni et al [ 158 ], who noted a significant (over 50%) decrease in soil heavy metal concentrations when a xanthan soil content of 0.25% was applied on clay soil with growing oat. Apart from enhancing the soil strength, the biopolymer–plant–soil reinforcing method was also able to improve the soil environment.…”

Section: Other Implications Of Xanthan and Gellan In Remediation Of H...mentioning

confidence: 99%

Prospects of Biogenic Xanthan and Gellan in Removal of Heavy Metals from Contaminated Waters

et al. 2022

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Biosorption is considered an effective technique for the treatment of heavy-metal-bearing wastewaters. In recent years, various biogenic products, including native and functionalized biopolymers, have been successfully employed in technologies aiming for the environmentally sustainable immobilization and removal of heavy metals at contaminated sites, including two commercially available heteropolysaccharides—xanthan and gellan. As biodegradable and non-toxic fermentation products, xanthan and gellan have been successfully tested in various remediation techniques. Here, to highlight their prospects as green adsorbents for water decontamination, we have reviewed their biosynthesis machinery and chemical properties that are linked to their sorptive interactions, as well as their actual performance in the remediation of heavy metal contaminated waters. Their sorptive performance in native and modified forms is promising; thus, both xanthan and gellan are emerging as new green-based materials for the cost-effective and efficient remediation of heavy metal-contaminated waters.

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“…Based on the potential of biopolymers to promote plant growth and improve soil mechanical properties, Ni et al (2024) explored the effects of biopolymers on plant growth, demonstrating that biopolymers improved water availability growing plants nutrient uptake. Additionally, Ni et al (2022) proposed the "xanthan gum-oat joint soil stabilization method", which has achieved significant results in enhancing the strength and erosion resistance of cohesive soil. This method has shown good results in improving the stability of shallow soil slopes contaminated by acid and alkali and the geotechnical properties of rocks and soil.…”

Section: Introductionmentioning

confidence: 99%

Study on Planting and Mechanical Properties of Clay Modified by Xanthan Gum and Guar Gum

Wan,

Liu,

Xiao

et al. 2024

Preprint

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The improvement of clay by using xanthan gum and guar gum was studied, and the combined solidification effect of the two after compounding was investigated. Investigations were conducted on three variants of biopolymer-augmented clays: xanthan gum, guar gum, and their combination. Assessments through plant growth and direct shear experiments elucidated their planting and mechanical properties. Scanning electron microscopy (SEM) experiments were conducted to analyze the microstructure of clay before and after modification, and the mechanism of improvement of clay by the two biopolymers was discussed in combination with planting and mechanical tests. The experimental results demonstrated that the planting performance of clay could be significantly enhanced by incorporating appropriate amounts of xanthan gum, guar gum, and composite gum, but was inhibited at excessive dosages. These biopolymers mainly increased the cohesive force of the soil, improving its shear strength while minimally affecting the internal friction angle. Among them, the compounded gum showed the most significant improvement in shear strength of the clay. The cohesive force and shear strength were notably enhanced when biopolymers and plant roots were combined. Specifically, ryegrass roots in biopolymer-modified clay substrates further increased shear strength. The study demonstrates that biopolymers can effectively promote plant growth and improve soil strength under the combined action of plant roots. The research results demonstrate that a synergistic thickening effect is achieved when xanthan gum is combined with guar gum, leading to gel particles aggregating with soil particles to enhance the shear strength of the soil. The relationship between the improvement of shear performance of xanthan gum and guar gum modified clay and the microscopic internal changes, and provide a reference for further exploring the new ecological slope protection substrate of green environmental protection.

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Experimental Study of the Usage of Combined Biopolymer and Plants in Reinforcing the Clayey Soil Exposed to Acidic and Alkaline Contaminations

Cited by 6 publications

References 70 publications

Soil quality enhancement by multi-treatment in the abandoned land of dry-hot river valley hydropower station construction area under karst desertification environment

Soil quality enhancement by multi-treatment in the abandoned land of dry-hot river valley hydropower station construction area under karst desertification environment

Prospects of Biogenic Xanthan and Gellan in Removal of Heavy Metals from Contaminated Waters

Study on Planting and Mechanical Properties of Clay Modified by Xanthan Gum and Guar Gum

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