Article
Engineering, Environmental
Longgang Chu, Long Cang, Zhaoyue Sun, Xinghao Wang, Guodong Fang, Juan Gao
Summary: This study investigated a novel approach of combining electrokinetic treatment and anode oxidation for remediating organic contaminated soil. The results showed that the combination of a special anode and strategies to regulate electro-osmotic flow direction could effectively remove phenanthrene without adding oxidants, and the remediated soil had low toxicity for plant growth.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Mingzhu Zhou, Qiuhua Li, Xia Wang, Qiao Huang, Long Cang
Summary: PMS showed higher removal efficiencies for PAHs contaminated soil compared to PS, indicating its superior oxidation capacity. The use of enhancements increased the removal efficiency for PAHs by 0.33 to 2.10 times, with the highest efficiency achieved at a fixed catholyte pH of 4.
Review
Engineering, Environmental
Jamie M. Purkis, Phil E. Warwick, James Graham, Shaun D. Hemming, Andrew B. Cundy
Summary: Electrokinetic remediation (EKR) shows high removal efficiencies in removing radionuclides from contaminated substrates, especially in low-permeability substrates. The technology has great potential for nuclear site applications and future development.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Review
Environmental Sciences
Zeying Sun, Miaomiao Zhao, Li Chen, Zhiyang Gong, Junjie Hu, Degang Ma
Summary: This paper systematically summarizes the basic principles and related physical and chemical phenomena of electrokinetic remediation (EKR) technology, and proposes three limiting problems of EKR technology: weak ability of dissolving metals, focusing effect, and energy consumption. It summarizes the main ideas to solve these problems based on various enhanced EKR technologies, compares the advantages and disadvantages of each technology, which has guiding significance for the development of new technology in the future.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Chemistry, Physical
Larysa Lysenko, Nataliya Mishchuk, Volodymyr Kovalchuk
Summary: This article analyzes the main methods of deactivating charged and uncharged pollutants in natural disperse systems, such as soils and bottom sediments, including chemical, biological, and physical methods. The advantages and disadvantages of different methods are discussed, with a focus on the use of electrokinetic decontamination in fine disperse systems. The results show that electrokinetic treatment offers a balanced approach to achieve efficient decontamination without excessive energy consumption.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2022)
Article
Engineering, Environmental
Nnanake-Abasi O. Offiong, Godwin J. Udo, Edu J. Inam, Akanimo N. Ekanem, Joachim J. Awaka-ama, Emaime J. Uwanta, Jun Dong
Summary: In this study, the performance of aqueous extracts of Talinum triangulare (AET) and soap solution prepared from Hura crepitans seed oil saponified by aqueous solution of ashed plantain peels (HCS) for removal of naphthalene and phenanthrene from soil was evaluated. The results showed that AET had slightly lower removal efficiencies compared to the commercial Tween 80 surfactant. Furthermore, the three remediants affected the distribution of trace metals in the soil after surfactant washing.
ENVIRONMENTAL ENGINEERING RESEARCH
(2023)
Article
Environmental Sciences
Nieves Garcia-Blas, Eva Jimenez-Relinque, Marta Castellote
Summary: This study found that surfactants can help with metal solubilization, but their effect depends on the type of metal. Each metal has a unique optimal species combination in the enhancing electrolyte. The direction of the electroosmotic flow is determined by the chemical conditions of the system as a whole, not by the type of surfactant. Surfactants in combination with citric acid (CA) and ethylenediaminetetraacetic acid (EDTA) can improve desorption in general, which is attributed to an increase in charge density passed during the tests rather than a symbiotic enhancement between both types of enhancing solutions.
JOURNAL OF SOILS AND SEDIMENTS
(2022)
Article
Engineering, Environmental
Sara B. Denison, Peixuan Jin, Priscilla Dias Da Silva, Chun Chu, Bhagavatula Moorthy, Thomas P. Senftle, Kyriacos Zygourakis, Pedro J. J. Alvarez
Summary: Transition metal catalysts can enhance the pyrolytic remediation of soils contaminated with polynuclear aromatic hydrocarbons (PAHs) by increasing the pyrene adsorption and promoting faster degradation at lower temperatures. However, higher pyrolysis temperatures may be required to mitigate residual toxicity.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Agronomy
Victor Chaplygin, Tamara Dudnikova, Saglara Mandzhieva, Tatiana Minkina, Anatoly Barakhov, Dina Nevidomskaya, Vishnu Rajput, Yuri Litvinov, Marina Burachevskaya, Natalia Chernikova, Olga Nazarenko, Andrey Barbashev, Svetlana Sushkova
Summary: Based on 10 years of environmental monitoring, the study examined the regularities of heavy metals and polycyclic aromatic hydrocarbons (PAHs) in agricultural landscapes and their accumulation in Triticum aestivum. The prevailing wind direction and atmospheric transfer were found to be significant factors for pollutants accumulation. As the content of pollutants in soil increased, their accumulation in Triticum aestivum exceeded maximum permissible concentrations (MPC), particularly for Pb, Cd, and BaP. The influx of pollutants into the plant was only significant for Mn, Cr, and BaP, while others were mainly accumulated through foliar influx. Triticum aestivum showed higher tolerance to heavy metals pollution compared to PAHs.
Article
Environmental Sciences
Soheil Valizadeh, Sang Soo Lee, Yong Jun Choi, Kitae Baek, Byong-Hun Jeon, Kun-Yi Andrew Lin, Young-Kwon Park
Summary: This study evaluates the potential of biochar for immobilizing polycyclic aromatic hydrocarbons (PAHs) in soil. The bonding mechanisms and strength of bonds between biochar and PAHs are described, along with various factors that influence the extent and rate of PAHs immobilization. The study also discusses the interaction between biochar, microbes, and plants in soil, and the potential of combining biochar with biological tools for further remediation of PAHs. The recent technologies and challenges related to the application of biochar in soil remediation are explained.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Na Li, Rui Liu, Jianjun Chen, Jian Wang, Liqun Hou, Yuemei Zhou
Summary: Fire Phoenix and N12 exhibited enhanced growth and removal capabilities in soils contaminated with PAHs and Cd, while E. purpurea did not show significant improvement. The enhanced removal of PAHs by Fire Phoenix and N12 was related to improved rhizosphere microbial activities.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Mukhtiar Ali, Xin Song, Da Ding, Qing Wang, Zhuanxia Zhang, Zhiwen Tang
Summary: This paper provides an in-depth review of the bioremediation of co-contaminated PAHs and heavy metals, examining their sources, transport, and the mechanisms and challenges of bioremediation under co-contaminated conditions. The paper also presents emerging strategies to overcome bioavailability problems and improve the effectiveness of bioremediation.
ENVIRONMENTAL POLLUTION
(2022)
Article
Geochemistry & Geophysics
Jamie M. Purkis, Andrew Tucknott, Ian W. Croudace, Phil E. Warwick, Andrew B. Cundy
Summary: Electrokinetic remediation (EKR) is a technology that overcomes traditional challenges in low permeability substrates, and its efficiency in mobilizing Cs and Sr in soils is determined by soil maturation time and voltage.
APPLIED GEOCHEMISTRY
(2021)
Article
Environmental Sciences
Soon-Oh Kim, Jin Young Jeong, Woo-Chun Lee, Seong-Taek Yun, Ho Young Jo
Summary: This study compared the performance of one-dimensional (1D) and two-dimensional (2D) electrode arrays in the remediation of heavy metal-contaminated soils, demonstrating that the 2D array improved the electrokinetic removal efficiency of contaminants. By changing the positions of anodes, the performance of the trigonal 2D electrode configuration was further enhanced, showing increased removal efficiency and decreased electrode cost and energy consumption.
JOURNAL OF SOILS AND SEDIMENTS
(2021)
Article
Environmental Sciences
Sudabeh Pourfadakari, Sahand Jorfi, Aliakbar Roudbari, Allahbakhsh Javid, Seyedeh Solmaz Talebi, Seid Kamal Ghadiri, Nader Yousefi
Summary: This study investigated the modification of soil contaminated with phenanthrene by electro-kinetic remediation using response surface methodology. The experiment identified the optimal conditions for PHE removal and found that a first-order kinetic model was the best fit for the process.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Engineering, Environmental
Jyoti K. Chetri, Krishna R. Reddy, Stefan J. Green
Summary: In recent years, biochar-amended soil cover has shown promise for enhancing microbial methane oxidation and reducing methane emissions. This study found that biochar infused with methane-oxidizing bacteria can reduce acclimation time and enhance methane oxidation activity. The addition of activated biochar to landfill cover soil resulted in higher methane oxidation rates and a shorter lag phase.
JOURNAL OF ENVIRONMENTAL ENGINEERING
(2022)
Article
Engineering, Geological
Girish Kumar, Krishna R. Reddy
Summary: This study presents a reliability-based analysis using a coupled thermo-hydro-bio-mechanical model to assess the long-term performance of a landfill cell under bioreactor landfill conditions. Monte-Carlo simulations and deterministic analysis were carried out, and the results reveal the influence of waste heterogeneity and waste properties on the performance metrics of the landfill cell. The stochastic analysis provides more accurate predictions and identifies the factors that have the greatest impact on the performance of the landfill cell.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2022)
Article
Environmental Sciences
Raquel Rios-Castro, Adrian Cabo, Eva Teira, Claudio Cameselle, Susana Gouveia, Pedro Payo, Beatriz Novoa, Antonio Figueras
Summary: In this study, the DNA metabarcoding technique was used to analyze prokaryote diversity and community structure in wastewater and evaluate the efficiency of a wastewater treatment plant. The results showed significant differences in microbiomes among different sample types, with exclusive OTUs found in mussels, post-treatment discharge water, and raw wastewater. Seasonal variations were also observed in wastewater, potentially influenced by abiotic factors. The presence of potential pathogens in raw wastewater highlighted the importance of wastewater treatment, which was confirmed to effectively remove pathogens.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Engineering, Environmental
Ashutosh Kumar, Sarat Kumar Das, Lohitkumar Nainegali, Krishna R. Reddy
Summary: Coal production leads to the generation of extensive coal overburden (OB), resulting in groundwater and soil contamination, land degradation, and biodiversity loss. This paper conducts a systematic bibliometric analysis to analyze the trend topics related to OB generation and management worldwide. Traditional reclamation techniques, the benefits and limitations of biological remediation methods, and the advantages of vegetation as a sustainable approach for OB management are summarized. Challenges associated with vegetation and future research needs are identified. The study also discusses the mechanisms of dump slope stability enhancement and methods to estimate root cohesion during the vegetation process.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Construction & Building Technology
Xian-Lei Fu, Heng Zhuang, Krishna R. Reddy, Ning-Jun Jiang, Yan-Jun Du
Summary: This study developed a novel composite polymer-amended bentonite for environmental containment applications. Laboratory experiments were conducted to evaluate the properties of the polymer-amended bentonite, including free swell index, liquid limit, hydraulic conductivity, rheological properties, and polymer stability. The results showed that the polymer-amended bentonite with a PAC-HPMC mass ratio of 7 had the lowest hydraulic conductivity and stronger hydrogen bonding strength. The yield stress of the polymer-amended bentonite was found to be a good indicator for evaluating polymer stability and the effectiveness of the engineered barrier material.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Environmental Sciences
Ashutosh Kumar, Sarat Kumar Das, Lohitkumar Nainegali, Krishna R. Reddy
Summary: This paper discusses the effect of organic amendment on the growth characteristics and root distribution of native grass Dendrocalamus strictus species in India. The results show that the chosen grass can survive on the coalmine overburden dumps with suitable external amendment and exhibit a well-developed root system and higher root reinforcement.
INTERNATIONAL JOURNAL OF PHYTOREMEDIATION
(2023)
Review
Green & Sustainable Science & Technology
Krishna R. Reddy, Valeria Kandou, Rachel Havrelock, Ahmed Rachid El-Khattabi, Teresa Cordova, Matthew D. Wilson, Braeden Nelson, Citlalli Trujillo
Summary: Water reuse is a practical solution to address water scarcity by augmenting water supplies. However, implementing water reuse can be challenging due to infrastructure requirements, economic issues, and social acceptance.
Article
Environmental Sciences
Anshumali Mishra, Sarat Kumar Das, Krishna R. R. Reddy
Summary: The performance of cement mortar and concrete incorporating 100% coalmine overburden (OB) as aggregate was evaluated through carbonation and rapid chloride penetration tests. The results showed that OB can be a good replacement for natural aggregate in construction materials, and the performance under corrosion testing was comparable to river sand.
WASTE AND BIOMASS VALORIZATION
(2023)
Article
Engineering, Environmental
Bhoomi A. Kamdar, Chandresh H. Solanki, Krishna R. Reddy
Summary: This research utilizes an organic binder to remediate lead-contaminated soil using the stabilization/solidification technique, avoiding the environmental consequences of inorganic binders like cement. The study synthesizes biochar through slow pyrolysis of moringa seed cake or de-oiled cake and investigates its physicochemical characteristics, revealing its potential for lead adsorption due to high pH and abundant surface functional groups. The effects of biochar content and curing time on soil stabilization are evaluated, showing that 10% biochar and 28 days of curing effectively reduce lead leachability and improve soil strength and pH.
JOURNAL OF ENVIRONMENTAL ENGINEERING
(2023)
Article
Engineering, Geological
Xian-Lei Fu, Zhe-Yuan Jiang, Krishna R. Reddy, Kunlin Ruan, Yan-Jun Du
Summary: The effects of organic acid-laden groundwater exposure on the hydraulic conductivity and microscopic characteristics of sand-bentonite backfill in slurry trench cutoff walls were comprehensively assessed.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2023)
Article
Construction & Building Technology
Anshumali Mishra, Sarat Kumar Das, Krishna R. Reddy
Summary: This study investigates the potential of coal mine overburden (OB) from opencast mine dumps as a sustainable alternative to natural aggregate. The study evaluates the microproperties (mineralogy, morphology, and chemistry) and macroproperties (alkali-aggregate reaction, soundness, durability, flow value, ultrasonic pulse velocity, and mechanical properties) of crushed OB, OB-based mortar, and concrete. The results show that OB is mineralogically more stable, mechanically comparable, and durable than other natural aggregate alternatives. There are no hazardous effects on soil and water quality due to leaching. OB-based mortar and concrete exhibit good corrosion resistance.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Construction & Building Technology
Anshumali Mishra, Sarat Kumar Das, Krishna R. Reddy
Summary: Due to the global sand crisis, the use of natural sand is no longer sustainable. Coal mine overburden sand and crushed granite sand are two environmentally friendly alternatives. This study compares their life cycle assessments and finds that OBS causes less environmental burden compared to M-Sand, with significant reductions in impacts on human health, ecosystem quality, climate change, and resource depletion.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Geological
Ashutosh Kumar, Sarat Kumar Das, Lohitkumar Nainegali, K. V. N. S. Raviteja, Krishna R. Reddy
Summary: Coal mine waste rocks are disposed of in non-engineered dumps with a height of 100-120 m to reduce space utilization. However, these dumps are prone to slope failures due to the loose, cohesionless material and high heterogeneity. This study evaluates the stability of a typical dump configuration in Jharkhand, India and investigates the influence of slope geometry and material heterogeneity on slope stability through numerical analysis and parametric studies. Recommendations for remediation methods, including modified slope geometry and benches, are provided to achieve the desired safety factor.
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Bhoomi A. Kamdar, Chandresh H. Solanki, Krishna R. Reddy
Summary: This study investigated the stabilization and solidification effect of hardwood biochar on soil contaminated with high concentrations of lead. The results showed that the TCLP lead levels decreased with increasing biochar dosage and curing time. Adding 5 wt.% biochar could achieve an immobilization efficiency of 88% after 28 days of curing. X-ray diffraction and scanning electron microscopy analyses indicated that physical adsorption and lead precipitation were the underlying mechanisms for Pb immobilization.
JOURNAL OF HAZARDOUS TOXIC AND RADIOACTIVE WASTE
(2023)
Article
Engineering, Environmental
Sumaja Kolli, Pradeep Kumar Dammala, Ahsan Ul Haq, Krishna R. R. Reddy
Summary: This study proposes a method to solve the problems of marble slurry disposal and sand migration in Rajasthan, India. By treating the discarded marble slurry and sand, a crust is formed to stabilize the sand dunes and reduce wind-led soil erosion by up to 70%. However, further experiments and field tests are needed to determine the optimal mixture of marble slurry and sand.
JOURNAL OF HAZARDOUS TOXIC AND RADIOACTIVE WASTE
(2023)