Article
Engineering, Environmental
Yunhao Xie, Lun Lu, Baoliang Chen
Summary: The traditional soil washing methods for the remediation of heavy metal contaminated soils are unsustainable due to high costs, secondary pollution, and soil deterioration. In this study, an asymmetrical alternating current electrochemically-mediated remediation platform is developed, which efficiently remediates real contaminated soil without excessive nutrient loss or secondary pollution. The consumption of washing effluents for this method is significantly lower than traditional methods. The use of an amidoxime-functionalized electrode and positive bias enables the adsorption of contaminant species, followed by reduction and recycling in a cyclic system. This study provides a sustainable remediation method for Cr(VI)-contaminated soil and paves the way for practical applications of electrochemically-mediated soil remediation.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Green & Sustainable Science & Technology
Qian Wang, Jia Wen, Xiaohong Hu, Lang Xing, Caiya Yan
Summary: This study investigated the remediation of soil contaminated by hexavalent chromium using a combination of natural clay mineral attapulgite and natural antioxidant tea polyphenols. The results showed that the green-tea impregnated attapulgite effectively reduced the Cr(VI) content in soil and promoted the conversion of Cr(VI) to Cr(III). Additionally, it improved soil enzyme activities and environmental conditions, demonstrating its potential as a cost-effective and environmentally friendly solution for remediation of Cr(VI) contaminated soils.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Environmental Sciences
Erika Jez, Carlo Bravo, Domen Lestan, Simon Gluhar, Ladislau Martin-Neto, Maria De Nobili, Marco Contin
Summary: The study found that CaEDTA remediation significantly decreased the free fraction of humic acids in soils contaminated with potentially toxic metals, while the bound fraction of humic acids and fulvic acids remained unchanged. Disturbance of intermolecular bonds during remediation affected the composition of the free humic acid fraction, confirming a selective removal of non-radical molecules such as carbohydrates while increasing the concentration of free radicals in acidic soil. The restoration of free humic fractions is likely to be a long-term process, indicating that CaEDTA soil washing is moderately conservative in terms of soil organic matter remediation.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Chemistry, Physical
Yanfeng Huang, Yuliang Tu, Jinxiong Wu, Xiangjing Liang, Dongye Zhao, Patrycja Boguta, Xintai Su
Summary: In this study, commercial humic acid was used as an extractant to treat high concentration Cr-contaminated soil, showing a high removal rate of Cr(VI) with low economic cost.
SURFACES AND INTERFACES
(2022)
Article
Acoustics
Jongbok Choi, Dukyoung Lee, Younggyu Son
Summary: The study found that ultrasound-assisted soil washing can improve the removal efficiency of heavy metals, especially under extreme conditions. Additionally, ultrasound can enhance the removal of heavy metals from smaller soil particles.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Chemistry, Physical
Xueji You, Chaomeng Dai, Shuguang Liu, Yanping Duan, Bo Tan, Yalei Zhang
Summary: Ethylenediaminetetraacetic acid (EDTA) is commonly used to clean heavy metal contaminated fields, especially those with low-permeability zones rich in clays. This study investigated the release kinetics of cations from clayey sediments during EDTA elution and the mechanisms controlling cation release. The results showed that EDTA greatly enhanced the release of cations from clays, with more interlayer cations being brought out via complexation and structural cations being released due to the breaking of metal-oxygen bonds. The first-order release rate constants of structural cations were slower than those of interlayer cations, indicating slower mineral dissolution.
APPLIED CLAY SCIENCE
(2023)
Article
Environmental Sciences
Jing Yang, Qian Guo, Lei Li, Ruixue Wang, Yucheng Chen, Xingrun Wang
Summary: Compared to the concentration of Cr(VI), the distribution of specific Cr(VI) species in soil is often overlooked. This lack of attention may lead to inaccurate environmental risk assessment of Cr(VI) contaminated soil and hinder soil remediation efforts. This study systematically investigates the mechanisms and factors controlling the evolution of Cr(VI) species in soil by analyzing the distribution of Cr(VI) and Cr(III) species in soils with different particle sizes and textures. The results show that Cr(VI) can be adsorbed by minerals containing exchangeable calcium ions and metal oxide hydrates, forming stable adsorbed Cr(VI). Additionally, a small fraction of Cr(VI) precipitates as calcium chromate. The majority of Cr(VI) discharged into soil tends to be reduced by ferrous ions or minerals containing ferrous ions, resulting in the formation of Fe(III)-Cr(III) coprecipitate. The speciation of Cr in the soil is closely correlated to the contents of iron, exchangeable calcium ions, and metal oxide hydrates, which influence the reduction, precipitation, and adsorption of Cr(VI), respectively. After the equilibrium of these reactions is reached, the remaining Cr(VI) retains its original water-soluble state in soil.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Chemistry, Applied
Manas Shukla, Bishwadeep Baksi, Suraj Prakash Mohanty, Biswanath Mahanty, Aliveli Mansi, Eldon R. Rene, Shishir Kumar Behera
Summary: This study conducted lab-scale soil washing experiments using two chelating agents, EDTA and NAC, and optimized the process using response surface methodology. The results showed that NAC is more effective than EDTA in removing Cr+6 contamination from soil.
PROGRESS IN ORGANIC COATINGS
(2022)
Article
Environmental Sciences
Longheng Xiao, Tianhua Zhang, Min Guo, Xiangtao Huo, Mei Zhang
Summary: In this study, a comprehensive detoxification of heavy lead-contaminated soil and soil-washing wastewater (SWW) was achieved using composite washing and sulfide precipitation methods, which proved to be efficient and mild. Ethylenediaminetetraacetic acid and citric acid (EDTA and CA) were used for composite washing of soil, and the results showed that EDTA and CA had a better removal effect. Lead was extracted from SWW by sodium sulfide (Na2S) with a high precipitation rate. This study demonstrates the potential of these methods for effective and sustainable remediation of lead-contaminated soil and wastewater.
WATER AIR AND SOIL POLLUTION
(2023)
Article
Environmental Sciences
A. S. M. Fazle Bari, Dane Lamb, Geoff R. MacFarlane, Mohammad Mahmudur Rahman
Summary: This study investigated the remediation of arsenic-contaminated abandoned mine soils. Oxalic acid was found to be the most effective washing reagent. Washing reduced the leachability and bioaccessibility of arsenic and iron in the treated soil, but it still exceeded the remediation criteria. Soil washing and subsequent solidification/stabilization could be an alternative option for remediating extremely contaminated abandoned mine soils.
Article
Engineering, Environmental
Yi Zheng, Huilin Li, Qiu Yu, Lin Yu, Binquan Jiao, Dongwei Li
Summary: The combination of UV light with EKR technology utilizing natural organic matters and minerals in contaminated soil effectively reduced hexavalent chromium to trivalent chromium without the need for additional chemical reagents. This method improved the efficiency of EKR in soil near the anodic reservoir.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Wenzhi Gu, Mengyao Cui, Chang Tian, Cuicui Wei, Lixia Zhang, Dechong Zheng, Daping Li
Summary: The study found that citrate and lactate have good reduction effects in the continuous and stable remediation of Cr (VI)-contaminated soil, and citrate is more advantageous in maintaining the stability of the soil microbial community.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Review
Environmental Sciences
Jung Hwan Kim, Hassan Anwer, Yong Soo Kim, Jae-Woo Park
Summary: The study reviewed the washing of radioactive Cs-contaminated concrete and soil with a focus on the parameters of washing solution, clay components in the soil, and aggregates affecting the efficiency and mechanism for Cs decontamination. The research also discussed the importance of different sorption materials for treatment of Cs-contaminated supernatant, categorizing them into clay minerals, metal hexacyanoferrates, ammonium molybdophosphates, hypercrosslinked polymers, supramolecular sorbents, carbon nanotubes, and graphene oxide.
Article
Green & Sustainable Science & Technology
Chuanhe Fan, Jueshi Qian, Yun Yang, Huaqiang Sun, Jipeng Song, Yingru Fan
Summary: By calcining ceramsite, chromium contaminated soil (CCS) can be effectively disposed of with a suitable calcination temperature above 1100 degrees Celsius. The immobilization mechanism of Cr(VI) in ceramsite involves the transformation of Cr(VI) to Cr(III) and the formation of chromium-bearing mineral, (Mg,Fe)(Cr,Al)(2)O-4. Careful determination of the calcination temperature is crucial for the safe and valuable utilization of waste soil.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Green & Sustainable Science & Technology
Yongxin Ji, Wenjie Zhang, Yu Xiao, Hong Jiang, Liaoyu Ye
Summary: This paper proposes a treatment technique that combines reduction, adsorption, and solidification for remediation of Cr(VI)-contaminated soil. The introduction of an adsorbent into the reduction process improves the effectiveness of remediation and reduces the amount of reducing and solidifying agent required.
Article
Green & Sustainable Science & Technology
Yi-fan Zhou, Jiang-shan Li, Jian-xin Lu, Chris Cheeseman, Chi Sun Poon
JOURNAL OF CLEANER PRODUCTION
(2020)
Article
Engineering, Environmental
Ge Li, Cheng Wang, Yupeng Yan, Xinran Yan, Wentao Li, Xionghan Feng, Jiangshan Li, Quanjun Xiang, Wenfeng Tan, Fan Liu, Hui Yin
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Construction & Building Technology
Yi-fan Zhou, Jiang-shan Li, Jian-xin Lu, Chris Cheeseman, Chi Sun Poon
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Review
Environmental Sciences
Le Fang, Qiming Wang, Jiang-shan Li, Chi Sun Poon, C. R. Cheeseman, Shane Donatello, Daniel C. W. Tsang
Summary: This study focuses on phosphorus recovery from incinerated sewage sludge ash (ISSA) and suggests recommendations including optimizing the extraction process, developing plant-available adsorption media, and forming a high-purity phosphorus product.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Pei Tang, Dongxing Xuan, Jiangshan Li, Hiu Wun Cheng, Chi Sun Poon, Daniel C. W. Tsang
JOURNAL OF CLEANER PRODUCTION
(2020)
Article
Green & Sustainable Science & Technology
Yi-fan Zhou, Jian-xin Lu, Jiang-shan Li, Chris Cheeseman, Chi Sun Poon
Summary: Seawater accelerates the hydration of lime-ISSA system and enhances the mechanical strength of both lime-ISSA and lime-FA systems. The formation of a dense microstructure in lime-ISSA pastes hydrated with seawater contributes to improved mechanical properties compared to samples hydrated using freshwater.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Green & Sustainable Science & Technology
Yifan Zhou, Jianxin Lu, Jiangshan Li, Chris Cheeseman, Chi Sun Poon
Summary: This study investigated the effects of sea salts on lime-sewage sludge ash binder, revealing that the addition of NaCl and MgCl2 can accelerate the setting process and increase compressive strength, with NaCl mixture showing the highest Cl- concentration.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Environmental Sciences
Jing Nie, Qiming Wang, Shengya Gao, Chi Sun Poon, Yaoyu Zhou, Jiang-shan Li
Summary: With rapid economic growth and urbanization, the recycling of solid waste has become a priority for sustainable development. This study showed that a granular adsorbent prepared from incinerated sewage sludge ash and waste bentonite effectively removed Pb(II) from aqueous solutions. The adsorption process was dominated by electrostatic attraction, precipitation, and complexation, and exhibited a good correlation with the Freundlich model.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Environmental Sciences
Yifan Zhou, Guanghua Cai, Chris Cheeseman, Jiangshan Li, Chi Sun Poon
Summary: The study highlights the beneficial use of ISSA and traditional binders to stabilize/solidify marine sediments, achieving high strength and low environmental impact. Combining ISSA with lime can be a promising alternative to cement in producing fill materials for dredged marine sediments.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Geological
Jiangshan Li, Wenhao Jiang, Shangqi Ge, Xiaohui Chen, Xin Chen, Lei Liu
Summary: This study presents analytical solutions for the one-dimensional nonlinear consolidation process of saturated clay under non-isothermal distribution condition, considering time-dependent loading. The analytical solutions include different boundary conditions and loading patterns. The correctness of the solutions is validated through comparisons with existing analytical and finite difference solutions. The effects of temperature gradient, final loading, and loading time on the consolidation behavior are analyzed.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
Article
Green & Sustainable Science & Technology
Yong Wan, Xinminnan Hui, Xingxing He, Jianfei Xue, Dianzhi Feng, Zhixiang Chen, Jiangshan Li, Lei Liu, Qiang Xue
Summary: In this study, the use of industrial by-product FGDG was effective in improving the strength and durability of solidified dredged soil from the Yellow River, with 50% FGDG content in the binder showing the best results. Increasing FGDG content in the binder also enhanced plant growth. Microstructural analysis revealed an increase in hydration products during dry-wet cycles, leading to denser structure and improved strength.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Geological
Wenhao Jiang, Shangqi Ge, Chen Feng, Xiao Huang, Jiangshan Li
Summary: This study develops a coupled model for the transport of organic contaminants in GM/GCL/CCL composite liner considering nonlinear consolidation and thermal-diffusion behaviors. The model incorporates the influences of temperature and provides finite difference solutions. Comparative analysis under different circumstances effectively verifies the rationality of the proposed model. The study also investigates the effects of temperature, thermal-diffusion, and consolidation on the transport behaviors.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2023)
Article
Engineering, Mechanical
Wenhao Jiang, Chen Feng, Shangqi Ge, Saiou Fu, Jiangshan Li
Summary: In this study, a fully coupled model for one-dimensional large-strain consolidation and heat conduction is established to investigate the consolidation behaviors of saturated clay. The numerical solutions for the coupled model are developed based on the finite difference method and validated by comparing with simulation results and analytical solutions. The results show that temperature has significant effects on excess pore-water pressure dissipation rate and settlement, while effective yield stress and permeability coefficient also influence the consolidation behaviors.
JOURNAL OF ENGINEERING MECHANICS
(2023)
Article
Engineering, Environmental
Zhen Chen, Jiang-Shan Li, Chi-Sun Poon, Wen-Hao Jiang, Zi-Han Ma, Xin Chen, Jian-Xin Lu, Hao-Xin Dong
Summary: This study investigates the effects of one-step alkaline washing, one-step thermal quenching, and two-step combination of alkaline washing and thermal quenching pretreatment methods on the key properties of MSWIFA for promoting its reusability. The results show that the pretreatments can reduce particle size, increase pore volume and specific surface area, remove chloride and sulfate anions, and improve pozzolanic activities of the MSWIFA. The combined pretreatment method is the most effective in eliminating gas emission, reducing leaching of metal ions and anions from the ash, and enhancing the pozzolanic activity.
Article
Environmental Sciences
Chen Feng, Jiangshan Li, Wenhao Jiang, Jindu Liu, Qiang Xue
Summary: Goethite nanoparticles modified biochar (FBC) is effective in immobilizing arsenic (As (V)) and cadmium (Cd (II)) in co-contaminated soils. FBC promotes the formation of small macroaggregates and increases shear strengths of co-contaminated soils. The maximum adsorption capacity of FBC for As (V) and Cd (II) is 31.96 mg g-1 and 129.31 mg g-1, respectively.
