Article
Chemistry, Physical
Neslihan Dogan-Saglamtimur, Ahmet Bilgil, Magdalena Szechynska-Hebda, Slawomir Parzych, Marek Hebda
Summary: Bottom ash, a waste formed by burning coal, can be used as a substitute for clay in brick production. The samples showed decreased unit weight values and met the compressive strength standards, proving the potential of fired bricks in the construction industry.
Article
Chemistry, Applied
Songzhen Tang, Liang Ding, Junjie Zhou, Bo Shen, Hang Li
Summary: A comprehensive CFD model was used to investigate the dynamic deposition behavior of ash particles during Zhundong coal combustion. Different models were used to describe the deposition behavior, and the morphology evolution process of the deposited layer was predicted. The results showed that the novel heating surface had better performance in terms of deposition resistance and thermal-hydraulic performance compared to the typical heating surface, and it could be helpful for the efficient utilization of waste heat from dust-laden flue gases.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Applied
Songzhen Tang, Liang Ding, Junjie Zhou, Bo Shen, Hang Li
Summary: A comprehensive CFD model was established to study the dynamic deposition behavior of ash particles during Zhundong coal combustion. A novel heating surface based on the elliptical tube characteristics was proposed, which showed better anti-deposition and thermal-hydraulic performance compared to typical heating surfaces. The novel heating surface has practical application prospects and feasibility for the efficient utilization of waste heat from dust-laden flue gases.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Environmental Sciences
Yu Xia, Yi Li, Yuting Sun, Wei Miao, Zhengang Liu
Summary: The immobilization efficiency of CA/BC for heavy metals was significantly enhanced due to increased pH value, surface functionality, and surface negative charge. The introduction of 5% CA/BC led to the highest reduction of leaching toxicity in polluted soils. The chemical speciation of Pb and Cd in soils changed remarkably, with bioavailable Pb and Cd mainly transformed into the most stable form of residual fraction.
ENVIRONMENTAL POLLUTION
(2021)
Article
Green & Sustainable Science & Technology
Zaid Ahsan Khan, Saidur R. Chowdhury, Bijoy Mitra, Mohammad Sayem Mozumder, Alaeldeen Ibrahim Elhaj, Babatunde A. Salami, Muhammad Muhitur Rahman, Syed Masiur Rahman
Summary: Industrial symbiosis (IS) involves sharing waste, by-products, heat, and logistics streams to reduce resource utilization and waste disposal cost, improve reuse, and create job opportunities. In Saudi Arabia, IS has been mainly focused on the power sector, but there is significant potential for its enhancement in major sectors such as oil and gas, petrochemicals, iron and steel, power generation, desalination, cement, and paper and pulp industries. This study investigates successful IS cases, proposes a symbiotic exchange framework, and develops a roadmap for IS implementation, considering enablers and barriers.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Environmental
Xiaobin Qi, Qiyao Yang, Weijian Song, Zhiping Zhu, Qinggang Lyu
Summary: The gasification fly ash (GFA), a bulk industrial solid waste from coal gasification process, was effectively disposed by conducting fluidized activation experiments in a bench-scale CFB test rig and steam activation experiments in a vertical tube furnace. The results showed that the pore structure of GFA developed in a matter of seconds and the specific surface area (SBET) increased with temperature, reaching a maximum increase of 48.9% and a value of 204 m2/g. The GFA exhibited an activation potential of 362 m2/g (SBET) through steam activation.
Article
Environmental Sciences
Nela Petronijevic, Dragana Radovanovic, Marija Stulovic, Miroslav Sokic, Gvozden Jovanovic, Zeljko Kamberovic, Srdan Stankovic, Srecko Stopic, Antonije Onjia
Summary: This study investigates the neutralization of acid mine drainage (AMD) using fly ash as an alternative material. The results show that fly ash samples have a high efficiency in neutralizing AMD, with significant precipitation rates of various heavy metal ions. The use of fly ash as a neutralization agent proves to be a promising and sustainable method for treating AMD.
Article
Thermodynamics
Hariana, Hanafi Prida Putra, Prabowo, Edi Hilmawan, Arif Darmawan, Keiichi Mochida, Muhammad Aziz
Summary: This study investigated the potential slagging and fouling when co-firing coal with different biomasses and found that co-firing coal with palm oil empty fruit bunch-frond, wood chip, or rice husk at a 25% blend offered similar combustion characteristics, gas emissions, ash deposits, and mineralogy. Co-firing with less than 25% solid recovered fuel requires further investigation to mitigate the slagging and fouling tendency. These findings are important for identifying suitable biomass fuels for co-firing with coal in power plants.
Review
Construction & Building Technology
Sanjana S. Kumar, R. Rithuparna, R. Senthilkumar, A. Bahurudeen
Summary: Alkali activated binders are gaining worldwide acceptance as a sustainable alternative to conventional cement. Waste-derived alkali activators, such as waste glass and rice husk ash, have been found to effectively resolve the cost and environmental concerns associated with commercial activators. However, research on the performance of waste-derived activators is limited. This study provides a systematic review of the performance of waste-derived activators in alkali activated binders.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Environmental Sciences
Hue Thi Nguyen, Viet Quoc Pham, Thi Phuong Mai Nguyen, Thuy Thi Thu Nguyen, Binh Minh Tu, Phuong Thu Le
Summary: This study examined the concentrations and characteristics of 18 polycyclic aromatic hydrocarbons (PAHs) in three incineration residues in Northern Vietnam. The results showed that the average concentrations of total PAHs in PM10, fly ash, and bottom ash were 9.55 x 10(3) ng/Nm(3), 215 x 10(3) ng/g, and 2.38 ng/g, respectively. Low-molecular-weight PAHs (2 to 3 rings) were dominant in most samples. The emission factor of total PAHs decreased in the order of FA > BA > PM10. Industrial facilities had higher concentrations of total PAHs compared to municipal facilities. The high carcinogenic proportion of PAHs and the significant emissions pose a high pollution risk when incineration ashes are reused.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Maria Alice P. Cechinel, Thays de Oliveira Guidolin, Andresa Rodrigues da Silveira, Janaina dos Santos Tasca, Oscar Rubem Klegues Montedo, Sabrina Arcaro
Summary: Raw pyritic waste and pure pyritic waste were found to be effective catalysts for discoloration of organic dyes, with the latter demonstrating faster discoloration rate due to larger surface area. However, a decrease in discoloration efficiency was observed for pure pyritic waste after 6 cycles of use.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Wenyu Ma, Jiaxuan Fan, Xiaoyan Cui, Yujiao Wang, Yumei Yan, Zilin Meng, Haixiang Gao, Runhua Lu, Wenfeng Zhou
Summary: The adsorptive behavior of H3PO4-activated spent coffee ground (SCG) biochar (P-SCGB) for the removal of the 2,4-dichlorophenoxyacetic acid (2,4-D) herbicide from aqueous solutions was investigated. P-SCGB exhibited a typical structure of amorphous materials and a porous structure. The maximum 2,4-D adsorption capacity of P-SCGB reached 323.76 mg g-1, higher than most of the previous studies. The study also revealed the multiple mechanisms for 2,4-D adsorption.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Energy & Fuels
Yueping Zhan, Zhiping Zhu, Dongyu Wang, Qinggang Lyu
Summary: The research investigates a new industrial circulating fluidized bed (CFB) gasifier and explores the effects of different factors on gasification indices to achieve stable operation and improved economic benefits. The study provides important boundary conditions for the safe and stable operation of the gasifier, supporting its commercial operation.
Article
Thermodynamics
Jiawei Li, Subo Fan, Xuyang Zhang, Zhichao Chen, Yanyu Qiao, Zhenhua Yuan, Zhengqi Li
Summary: This study investigated the co-combustion of coal gasification fine ash (CGFA) and raw coal (RC), exploring its thermal conversion, synergistic behavior, kinetics, thermodynamics, and gas release behavior. The results demonstrated that adding RC to CGFA enhanced the combustion performance of CGFA and reduced the formation of polluting gases. This research contributes to the development of new energy strategies utilizing CGFA combustion.
Article
Thermodynamics
Fenghai Li, Wei Zhao, Junguo Li, Hongli Fan, Meiling Xu, Guopeng Han, Mingxi Guo, Zhiqing Wang, Jiejie Huang, Yitian Fang
Summary: This study investigates the influence of phosphogypsum (PG) on the coal ash fusion characteristics and analyzes the modifications of ash fusion temperature (AFT) for Xiaolongtan coal (XLT) and Jiaozuo coal (JZ) under a reducing atmosphere. The AFT of mixed XLT increases with increasing PG mass ratio, while the AFT decreases for JZ mixtures. The suitable PG mass ratios for XLT and JZ are 4.9%-8.9% and 6.5%-9.0%, respectively. The changes in AFT result from the variations in the base/acid ratio and the presence of different minerals in the ash. The AFT variation can also be explained by the variations in the temperature range and ash composition positions in the SiO2-Al2O3-CaO ternary phase diagram with increasing PG mass ratio.
Article
Engineering, Environmental
Yui Kawasaki, Sayaka Nagao-Sato, Misa Shimpo, Kahori Fujisaki, Emi Yoshii, Rie Akamatsu, Petra Warschburger
Summary: This study qualitatively describes sustainable dietary behaviors (SDBs) that Japanese and German adults can implement in their lives, and quantitatively compares the similarities and differences in understanding SDBs between the two samples. The study found that Japanese participants were more focused on food waste prevention, while German participants were more focused on solving environmental problems.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Kechun Chen, Yuan Ding, Liming Yang, Zhihao Wang, Haoxuan Yu, Difan Fang, Yufa Feng, Liying Hu, Chenxi Xu, Penghui Shao, Xubiao Luo, Liang Chen
Summary: This study proposes a targeted repair scheme for the recovery of graphite anodes from spent LIBs by systematically characterizing and analyzing the structure and composition of spent graphite (SG). The results show that the repair scheme achieves effective SG repair and the repaired graphite anode displays excellent lithium storage performance.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Takao Ueda, Shigeki Koyanaka, Tatsuya Oki
Summary: Fires caused by accidental crushing of batteries are a serious issue in the e-waste recycling process. A new in-line sorting system that uses X-ray scanning and deep learning has been developed to accurately detect batteries. Through a validation study, the system achieved higher accuracy compared to other existing programs.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Hannes Geist, Frank Balle
Summary: Research on circular economy often lacks empirical data, especially in the theory of circular process design and design for remanufacturing. This study systematically collected and analyzed engineering data on seven remanufacturing processes in the European automotive remanufacturing industry for the first time, providing empirical support for circular engineering challenges, potentials, and solutions.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Xiaojing Li, Fan Lue, Nanlin Liao, Hua Zhang, Na Yang, Pinjing He
Summary: This study assesses and predicts the greenhouse gas emissions on the timeline as waste treatment technologies develop in Shanghai from 1991 to 2025 using the Life Cycle Assessment (LCA) methodology. The findings demonstrate that GHG emission has reached net-zero in 2019 owing to the application of alternative technologies and waste segregation.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Bingchun Liu, Haoyang Wang, Xiaoqin Liang, Yibo Wang, Zijie Feng
Summary: The expansion of the photovoltaic market has resulted in a significant increase in PV waste. Therefore, conducting scientific research to determine the importance of the circular economy for sustainable growth in the PV industry is essential. The study demonstrates that accurate prediction of PV installed capacity and quantifying the importance of recycling in balancing the supply and demand of raw materials can be achieved through a multi-factor installed capacity prediction model and recovery potential prediction.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Review
Engineering, Environmental
Chuanzhen Zhang, Baojing Gu, Xia Liang, Shu Kee Lam, Yi Zhou, Deli Chen
Summary: Reactive nitrogen is crucial for agriculture and human nutrition, but mismanagement can have detrimental effects on human health and ecosystem services, hindering the achievement of the 2030 Sustainable Development Goals. Progress towards nitrogen-related targets varies across countries, highlighting the need for integrated management to achieve overall synergies.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Alessandro Gatto, Marijke Kuiper, Corina van Middelaar, Hans van Meijl
Summary: This study examines the economic and environmental effects of transitioning towards more circular food systems in the European Union (EU27) by feeding animals with low-opportunity-cost feed and better utilizing local feed resources. The results show that providing subsidies for circularity and promoting the use of low-cost feed can increase animal production, but also have negative impacts on land use and emissions. On the other hand, promoting domestic feed sourcing through import tariffs can decrease animal production and greenhouse gas emissions in agriculture. However, complementary policies are needed to mitigate drawbacks and enhance benefits of a more circular agri-food system.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Jinbo Zhang, Liu Chen, Yulei Xie, Pingjian Yang, Zheng Li, Huaicheng Guo, Yang Zhang, Lirong Liu
Summary: This study examines the impact of carbon taxes on low-carbon development and climate change mitigation. By constructing a cross-system bi-layer model, the study finds that reasonable carbon taxes can promote the stability of the energy network, reduce carbon emissions and air pollutants, and optimize production efficiency and the structure of the energy system. This study contributes to a better understanding of the effects and implementation pathways of carbon taxes.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Konstantin Born, Mehmet Metehan Ciftci
Summary: Increasing recycling of metals is important for reducing reliance on mining, but it cannot fully meet future metal demand. Primary production of metals is expected to continue rising, highlighting the need for alternative circular economy strategies such as demand reduction and mitigating harmful impacts of primary metal production.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Yinqiu Ma, Lin Huang, Jiahui Li, Wei Cao, Yumei Cai
Summary: Afforestation and reforestation, such as China's Grain for Green Program, have shown to effectively mitigate greenhouse gas emissions and contribute to carbon sink capacity. This study highlights the significant carbon potential of the program and its potential application in other countries to reduce CO2 in the atmosphere.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Arlind Dervishaj, Kjartan Gudmundsson
Summary: This paper reviews digital tools for supporting the Circular Economy (CE) in the built environment and provides suggestions. The study identifies limitations in the functionalities of current tools, including a lack of representative data for LCA and underdeveloped circularity indicators. Further development is needed in terms of interoperability aspects, integration of more sources of data for LCA and circularity, and possibilities for a comprehensive evaluation of design choices.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Mohamadreza Y. Azarfam, Anuj Maheshwari, Frank D. Blum, Siddhesh Chaudhari, Clinton Switzer, Ranji Vaidyanathan, Jay C. Hanan, Sudheer Bandla
Summary: This study introduces a feasible method for manufacturing recycled composites using post-consumer carpets and recycled resin. The resulting composites have impressive strength and modulus, surpassing commercial thermoplastics and making them suitable for structural applications. This research presents a promising approach to address carpet landfilling and reduce reliance on additives.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Pujiang Shi, Tianle Huang, Hong Kit Lim, Chiew Kei Tan, Jong-Min Lee, Chor Yong Tay
Summary: This study developed a highly porous bioadaptive 3D sponge-like construct from plastic materials in discarded keyboards for advanced in vitro applications. The findings demonstrate the potential of using discarded keyboards as a waste-to-resource feedstock to achieve waste reduction and maximize value-capture.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Kuo-Jui Wu, Hailing Qiu, Caiyan Huang, Anthony S. F. Chiu, Ming-Lang Tseng
Summary: Government resource allocation practices for achieving carbon neutrality should be guided by dynamic system theory to identify potential dynamics. Carbon intensity control dynamics have a significant influence on other dynamics.
RESOURCES CONSERVATION AND RECYCLING
(2024)