Article
Green & Sustainable Science & Technology
Xiuzhen Zhang, Zhichao Liu, Fazhou Wang, Shuguang Hu
Summary: As a by-product of the alumina industry, red mud has caused serious environmental issues, but its disposal and utilization are restricted by its alkalinity. This study compares the dealkalization behaviors of red mud using CO2 and SO2. Results show that the removal of structural alkali is crucial for improving the dealkalization efficiency. CO2 has a limited effect on structural alkali, resulting in a low dealkalization efficiency of 18.4%. SO2, on the other hand, removes both soluble and structural alkalis, achieving a dealkalization efficiency of 95.5%.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Physical
Sukpyo Kang, Hyeju Kang, Byoungky Lee
Summary: The study proposes a method for recycling red mud as a construction material, which involves neutralizing liquefied red mud with nitric acid and adding it to cement paste. The neutralized red mud in cement paste showed higher early-age strength and positive impact on 28 days compressive strength and hydration system.
Article
Environmental Sciences
Dandan Huang, Yanxiu Wang, Chengwen Wang, Le Tao, Xiangsong Meng, Li Wang, Wei Sun
Summary: In this study, the distribution patterns of different particle sizes of red mud were analyzed using TIMA and EDS, and the alkali removal performance was compared under high temperature grading. The results showed that non-clay phases in the particles coagulate with clay phases, forming a mixture phase with impurities. The high-temperature grading effectively separated the elements and phases, promoting the comprehensive utilization of red mud.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Chemical
Zhaofeng Li, Hao You, Yifan Gao, Chuan Wang, Jian Zhang
Summary: The incorporation of red mud can improve the performance of slag-based geopolymeric grout, with ultrafine red mud showing better effects including reducing viscosity, decreasing thixotropy, and enhancing slurry stability. Red mud plays a filling role in the geopolymerization process, leading to a decrease in mechanical strength, although ultrafine red mud has higher mechanical strength.
Article
Metallurgy & Metallurgical Engineering
M. Archambo, S. K. Kawatra
Summary: Red mud is hazardous waste with a high generation rate and global stockpile. It is often disposed in environmentally harmful ways, but methods like CO(2) neutralization can reduce its impact. Innovative processes like the iron nugget method can extract valuable minerals from red mud and provide value to the waste.
MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW
(2021)
Article
Green & Sustainable Science & Technology
Umme Zakira, Kai Zheng, Ning Xie, Bjorn Birgisson
Summary: This study investigates the potential use of red mud as a raw material in the development of high-strength geopolymers. Two different mixing procedures were adopted while activating the raw ingredients using a sodium hydroxide and sodium silicate solution. The performance of the formed geopolymers was enhanced by adding silica fume as an additive. The synthesized geopolymers achieved extraordinary early compressive strength as high as 68.8 MPa and a high proportion of red mud, 50% by weight, could be utilized achieving a strength of 66 MPa.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Construction & Building Technology
Subhashree Samantasinghar, Suresh Prasad Singh
Summary: Red mud is a highly alkaline waste containing heavy metal ions, and its improper disposal leads to environmental issues. This study evaluates the physical, mechanical, and chemical properties of red mud treated with ground granulated blast furnace slag to determine its suitability for highway construction. Additional doses of alkali activator are used to accelerate the geopolymerization process. The results show that the stabilization of red mud reduces alkalinity and encapsulates heavy metals through geopolymeric reactions. The optimal combinations of slag and alkali can achieve target strengths for different constructions.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Review
Metallurgy & Metallurgical Engineering
Pravin Kannan, Fawzi Banat, Shadi W. Hasan, Mohammud Abu Haija
Summary: The study shows that the use of Ca- and Mg-rich brines can effectively lower the pH and total alkalinity of bauxite residue, making it a cost-effective and environmentally friendly waste management technique.
Article
Environmental Sciences
Zheng Chen, Minhua Su, Nan Chen, Dongyun Liang, Diyun Chen
Summary: This study investigated the removal of uranyl ions from mimic radioactive wastewater using different size fractions of red mud particles. The results showed that red mud particles with a size fraction of < 5-mu m exhibited the highest adsorption capacity, and the mineral phases in the red mud played an important role in uranyl ion adsorption.
ENVIRONMENTAL RESEARCH
(2022)
Article
Construction & Building Technology
Chuan Wang, Zhaofeng Li, Zhihao Zhou, Yifan Gao, Jian Zhang
Summary: By reinforcing red mud-based grouts with polypropylene, glass and basalt fibers, the mechanical properties of the grouts were significantly improved with increased elastic modulus and reduced porosity. Micro-structural analysis revealed effective interfacial bonding between the fibers and the geopolymeric binder, overcoming the shortcomings of red mud-based geopolymer grouts.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Chemistry, Physical
K. C. Sushma, R. B. Basavaraj, D. P. Aarti, M. B. Madhusudana Reddy, G. Nagaraju, M. S. Rudresha, H. M. Suresh Kumar, K. N. Venkatachalaiah
Summary: Intense red light emitting SrZrO3:Eu3+ nanopowders were successfully fabricated using a low-cost eco-friendly hydrothermal route with Aloe vera gel as a surfactant. The nanopowders exhibited a pure single-phase tetragonal structure with no impurity peaks. The energy band gap was calculated to be around 3.98 - 4.27 eV and the particle size was observed to be approximately 42 nm. The powders showed intense red emission under excitation at 395 nm and exhibited good luminescence properties.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Engineering, Chemical
Ahmet Demirtas, Gerard R. Klinzing
Summary: Powder compaction is a complex manufacturing process with challenging governing principles. Computational analyses are necessary to understand particle-level interactions. Particle diameter/shell-thickness plays a critical role in powder compaction behavior.
Article
Construction & Building Technology
Shaoliang Chen, Abdul Ghani Razaqpur, Tuanjie Wang
Summary: Past research has shown that non-calcined red mud has minimal pozzolanicity, while calcined red mud has even lower strength. Analyses suggest that the Al/Si ratio and crystalline transformations are crucial factors influencing this behavior.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Juntong Li, Qing Li, Ping Chen, Kai Yao, Penghuai Wang, Yang Ming, Jin Yi, Lili Zhi
Summary: In this study, Bayer red mud and ground granulated blast furnace slag were used to form alkali-activated cementitious materials (AASR) with different ratios. The effect of red mud content on the mechanical properties of AASR was analyzed by studying the compressive strength. Various testing techniques were used to reveal the influence mechanism of red mud content on the mechanical properties. The results show that the increase of red mud content leads to a decrease in compressive strength by affecting the porosity and hydration reaction process.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Ceramics
Hongcheng Mi, Longsheng Yi, Qian Wu, Jin Xia, Binghang Zhang
Summary: High-strength ceramsite was successfully prepared without any chemical additives through a two-stage sintering process using red mud, fly ash, and bentonite. The optimal synthesis conditions resulted in ceramsite with high compressive strength, low water absorption, and effective solidification of deleterious elements.
CERAMICS INTERNATIONAL
(2021)
Correction
Engineering, Environmental
Madhumita Mohanty, Rajib Sarkar, Sarat Kumar Das
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Engineering, Environmental
Madhumita Mohanty, Rajib Sarkar, Sarat Kumar Das
Summary: This study evaluates the stability of coal mine overburden (OB) dump slopes using Voronoi tessellation scheme and factorial design method through simulation software UDEC. A prediction model is established and the influence of material parameters on slope stability is investigated.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Engineering, Civil
Madhumita Mohanty, Rajib Sarkar, Sarat Kumar Das
Summary: This study investigates the characteristics of coal mine overburden materials and their impact on the seismic stability of slopes. Various methods, including multi-channel analysis of surface waves and finite element limit analyses, are used to analyze the spatial heterogeneity and its effects.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Anshumali Mishra, Sarat Kumar Das, Krishna R. Reddy
Summary: This study assesses the environmental impact of waste rock from a coal mine near Dhanbad, India, and explores its potential as a replacement for natural sand. The results indicate that using a sustainable fuel and energy mix in the production of overburden sand can significantly reduce environmental impacts.
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
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)
Article
Construction & Building Technology
Mahasakti Mahamaya, Surabhi Jain, Sarat Kumar Das, Rajdeep Paul
Summary: This manuscript aims to prepare alkali activated cementless controlled low strength material (CLSM) using industrial wastes such as ferrochrome slag (FS), ground granulated blast furnace slag, and fly ash. The physical and mechanical properties of different CLSM mix designs were evaluated and compared with cement-based FS-CLSM. The alkali activated FS-based CLSM exhibited adequate flowability and unit weight, with a strength range of 1.72 to 10.44 MPa and a California bearing ratio (CBR) value of 328%, making it a feasible pavement material. The study also highlighted the high durability and low levels of toxic metals in the leachate of FS-based CLSM, making it environmentally acceptable. Furthermore, a life cycle analysis was conducted to assess the impact of FS-based CLSM on the ecosystem and human health.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
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
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
Engineering, Geological
Madhumita Mohanty, Rajib Sarkar, Sarat Kumar Das
Summary: The seismic damage and behavior of coal mine overburden dump slopes were evaluated in this study using Voronoi tessellation scheme coupled with extended finite-element method. The research provided guidance for assessing the seismic performance of these slopes and highlighted the importance of considering heterogeneity in the analysis.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(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
Multidisciplinary Sciences
Vishwas N. Khatri, Lohitkumar Nainegali, Rajib Sarkar, Sarat Kumar Das
Summary: In this study, in situ multichannel analysis of surface waves was used to characterize the overburden layers of Jambad open cast coal mine in West Bengal, India. Laboratory tests were conducted on OB dump samples to evaluate their compaction and strength characteristics. Stability analyses of the OB dump slope and highwall were carried out using Optum G2 software, considering suggested configurations. The study also assessed stability under seismic loading conditions and provided recommendations for geometric configurations.
Article
Biotechnology & Applied Microbiology
Surabhi Jain, Chaolin Fang, Varenyam Achal
Summary: The review article elaborately discusses the metabolic pathways and mechanisms involved in MICP process, highlighting the advantages of denitrification over other pathways. It further explores the potential applications of denitrification in building materials and the challenges associated with its implementation.
Article
Biotechnology & Applied Microbiology
Shaofeng Zhou, Wenwen An, Cuifen Gan, Meiying Xu
Summary: Bacteria generate and release extracellular reactive oxygen species (eROS), which significantly contribute to the natural ROS pool and play a crucial role in metabolic interactions of bacteria with their environment. Understanding the behavior of eROS-generating bacteria and its environmental implications is of great importance in the cycling of biogeochemical elements, transformation of organic matter, and regulation of antibiotic resistance genes.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2024)
Article
Biotechnology & Applied Microbiology
Ji-Dong Gu, Tim Ford, Bryce Mitton, Ralph Mitchell
Summary: Plastics and microplastics are widely present and accumulating in the environment, leading to increasing public attention. In addition to packaging plastics, materials from industries such as electronics, space and aviation are also accumulating, but receiving less attention. The production of degradable and biodegradable plastics is seen as a way to reduce environmental impacts, but enhancing the non-degradability of functional polymers is also a feasible option. Microbial colonization and deterioration pose significant challenges to these materials.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2024)
Article
Biotechnology & Applied Microbiology
Justyna Bohacz, Michal Mozejko
Summary: This study evaluated the keratinolytic activity of 37 strains of Trichophyton ajelloi and found that pigmented strains isolated from loamy soil were more efficient in degrading native feather keratin, while non-pigmented strains isolated from chernozem showed better abilities. The keratinolytic activity increased over time, as evidenced by the increase in extracellular keratinase activity and release of soluble proteins and peptides. Protease activity peaked in the first 7 days and again on day 28 of culture. The release of ammonium and sulfate ions, associated with an increase in pH, reached its maximum on day 21. Three pigment-producing strains were among the most active in releasing large amounts of ammonium and sulfate ions. The biodegradation of feather waste by Trichophyton ajelloi strains can be used to produce fertilizers suitable for plants with high sulfur requirements.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2024)
Article
Biotechnology & Applied Microbiology
Joseph M. Suflita, Brenda J. Little
Summary: This article reviews the major achievements of the International Biodeterioration & Biodegradation Society (IBBS) on its 50th anniversary and provides recommendations for addressing new challenges and developments based on personal experiences.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2024)
Article
Biotechnology & Applied Microbiology
Zhenyan Lin, Tuo Jin, Xin Xu, Xiao Yin, Dan Zhang, Mengjiao Geng, Chunyu Pang, Gongwen Luo, Lizhi Xiong, Jianwei Peng, Jiangchi Fei
Summary: The incomplete recycle of residual mulch film (RMF) in recent years has led to an increase in plastic fragments in soil, posing a serious threat to the soil ecological environment. In this study, seven potential plastic-degrading microorganisms were screened and identified from film-mulched vegetable fields. The degradation ability experiments showed that both single strains and mixed strains demonstrated varying levels of degradation of RMF.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2024)
Article
Biotechnology & Applied Microbiology
Tiina Belt, Michael Altgen, Muhammad Awais, Martin Nopens, Lauri Rautkari
Summary: This study investigated the degradation of heat-treated wood by brown rot fungi and found that the decay increased the hygroscopicity of wood in the decaying state. Furthermore, it was observed that heat-treated samples were more susceptible to fungal decay compared to untreated samples, which may be related to the increase in moisture content.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2024)
Article
Biotechnology & Applied Microbiology
Marta Cicardi, Davide Bernasconi, Luca Martire, Linda Pastero, Giulia Caneva, Sergio E. Favero-Longo
Summary: This study investigated the phenomenon of Centimetric circular areas Uncolonized by Microbial Biofilms (CUMBs) on natural and heritage stone surfaces. The analysis revealed a compatibility in distribution and size between CUMBs and lichen thalli, suggesting a lichen origin for some CUMBs. Microscopic analysis also showed similar modifications in marble layers beneath CUMBs and lichens, indicating a possible alteration of stone properties by lichens.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2024)