Exploring effects of novel chemical modification of biochar on soil water retention and crack suppression: towards commercialization of production of biochar for soil remediation

An, Yongxue; Lu, Jinling; Niu, Renjie; Li, Manqi; Zhao, Xiangnan; Huang, Xilong; Huang, He; Garg, Ankit; Zhussupbekov, Askar

doi:10.1007/s13399-021-02081-w

Cited by 9 publications

(3 citation statements)

References 50 publications

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“…Clayey soil is favorable used as a buffer and backfill materials in waste containment due to its high swelling potential property and low permeability. However, various processes including drying and wetting , freezing and thawing (Lu et al 2016), dry and heat conditions (An et al 2021), and penetration by roots (Gadi et al 2020) contribute to desiccation cracks in clayey soils may change their mechanical characteristics and hydraulic properties. These changes may cause significant side effects on foundations, road embankments, leachate and gas emission of landfill liners (Safari et al 2014, Vo et al 2017, Gadi et al 2017.…”

Section: Introductionmentioning

confidence: 99%

Investigation on desiccation crack initiation and development of Tianjin Binhai dredger filling soils with fiber- reinforced

Li,

Zhang

et al. 2023

Preprint

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The increased porosity and permeability caused by cracking can pose a leachate hazard to municipal landfills. This paper describes a procedure for the evaluation of the cracking tendency during drying process on clayey soil. Based on desiccation experiments, it was found possible to estimate the moisture content, fractality and cracking characteristics, and the effect of fibre corporation incorporation on the cracking propagation of cohesive soils collected in dredger filling area in Tianjin. Based on this analysis, the following conclusions may be presented: fibre incorporation does not change the evaporation pattern of dry cracks, but can reduce the critical moisture content of cracking, which is reduced by 22.1% at 0.5% incorporation. The fractility also shows a continuous decreasing trend with the increase of fibre incorporation,which is reduced by 52.9% at 0.5% incorporation compared to the original state. The cracking characteristics were divided into three development stages. The results showed that the critical moisture content of the soil body was significantly reduced (18.8–7.8%) in stage II after fibre addition, and the cracks did not divide the soil body in stage III, which maintained the integrity of the soil body. The cracks had significantly decreased in length and width after fibre incorporation, and the number of cracks increased significantly. It indicates that the cracks cannot form through the cracks after fibre incorporation, and the crack resistance is obviously improved, which reduces the permeability of the soil.

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Section: Introductionmentioning

confidence: 99%

Investigation on desiccation crack initiation and development of Tianjin Binhai dredger filling soils with fiber- reinforced

Li,

Zhang

et al. 2023

Preprint

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“…Biochars can change the hydraulic properties of soil body and retain a large amount of water and nutrients inside the soil system. Other materials such as fiber, silica powder, and microorganism have also been added into soils to suppress cracks [26][27][28][29][30]. Kalkan [31] proposed that silica fume can decrease the development of desiccation cracks of the soil samples.…”

Section: Introductionmentioning

confidence: 99%

Effect of Corn Stalk Biochar on the Evolution of Water Evaporation and Cracking of Soil

Zhang

et al. 2022

Geofluids

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The evolution of water evaporation and cracking of soil affected by corn stalk biochar is experimentally investigated. Water evaporates from the soil surface, causing shrinkage in soil body and forming cracks, which significantly lead to crop nutrient loss, groundwater pollution, and land salinization. Biochar is a recyclable natural material widely used in improving the water retention and suppression of cracking of soils. Free desiccation tests were conducted with adding the biochar contents of 0%, 4%, and 8%. The variation of water evaporation amount and the development of cracking were recorded and disposed. The results show that the evaporation process can be changed due to the addition of biochar contents. The evaporation rate can be divided into three phases of a constant rapid evaporation phase, a fluctuated evaporation phase, and a residual evaporation phase. A sudden increase at around 30% of moisture content in evaporation rate indicated that the crack began to develop and extend greatly, which increased the evaporation surface area. The residual moisture contents of soils with biochar contents of 4% and 8% increased by 105.56% and 88.38% than those of soil without biochar, respectively. The crack ratio reduced by 32.39% and 15.31% with the addition of biochar contents of 4% and 8%, respectively. A three-level crack was observed during evaporation process, where a second and third crack developed less with the addition of biochars. The corn stalk biochar improves the integrity of soil bodies and increases the connection of soil particles for more water storing between the biochar particles and soil particles. It can be concluded that corn stalk biochars are able to delay the evaporation and cracking developing in cohesive soils, which may be beneficial for crops in dry area.

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“…Biochar modi cation treatments mainly include physical modi cation, chemical modi cation, and biological modi cation (Rajapaksha et al 2016). Chemical modi cation has been widely promoted by experimental research and practical application because of the signi cant improvement in its repair effect on heavy metals (Wang et al 2022;An et al 2021;Shi et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Passivation Remediation of Cadmium Contaminated Soil by Polyethyleneimine Modified Biochar

Wang

et al. 2022

Preprint

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Biochar was prepared from tobacco straws, and polyethyleneimine (PEI) was loaded on the biochar surface to produce PEI-modified biochar (PBC). The remediation effect of PBC on Cd-contaminated soil was studied. During the soil incubation, soil samples were collected three times at 30, 60 and 90 days, and the physical and chemical properties of soil and the contents of heavy metals were determined after natural drying. After conducting passivation and remediation of Cd-contaminated soil, the available Cd content decreased significantly, the residual and oxidizable heavy metal Cd contents in the soil increased significantly, and the weak acid extractable Cd content decreased. When the PBC addition amount was 3% and the soil was cultured for 90 d, the available Cd content in the soil decreased by 54.36%, the weak acid extractable Cd content decreased by 35.36%, and the residual Cd content increased by 184.67%. This indicates that PBC can be used to repair heavy metal-contaminated soil and reduce the bioavailability, migration, and transformation ability of heavy metal Cd.

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Exploring effects of novel chemical modification of biochar on soil water retention and crack suppression: towards commercialization of production of biochar for soil remediation

Cited by 9 publications

References 50 publications

Investigation on desiccation crack initiation and development of Tianjin Binhai dredger filling soils with fiber- reinforced

Investigation on desiccation crack initiation and development of Tianjin Binhai dredger filling soils with fiber- reinforced

Effect of Corn Stalk Biochar on the Evolution of Water Evaporation and Cracking of Soil

Passivation Remediation of Cadmium Contaminated Soil by Polyethyleneimine Modified Biochar

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