Article
Engineering, Environmental
Yuying Zhang, Zhonghao Wan, Lei Wang, Binglin Guo, Bin Ma, Liang Chen, Daniel C. W. Tsang
Summary: The interaction between magnesium phosphate cement (MPC) and zinc oxide (ZnO) in the stabilization/solidification (S/S) process of Zn-rich electroplating sludge was investigated, revealing changes in precipitate chemistry and microstructure transition. The formation of amorphous Zn-3(PO4)(2)center dot 2H(2)O/Zn-3(PO4)(2)center dot 4H(2)O inhibited the formation of Mg-phosphate precipitates.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
Chen Sun, Weizhe Ge, Yuying Zhang, Lei Wang, Yan Xia, Xiaoqing Lin, Qunxing Huang, Shengyong Lu, Daniel C. W. Tsang, Jianhua Yan
Summary: In this study, CaO or MgO was used to activate GGBS for stabilization/solidification of hazardous MSWI FA. The formation of reaction products was significantly inhibited by PTEs in CaO-GGBS system, while PTEs had insignificant inhibition in MgO-GGBS system, leading to lower leachabilities of PTEs and higher mechanical strengths. MSWI FA could be effectively recycled by MgO-GGBS binder into blocks with desirable properties.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Multidisciplinary Sciences
Qiyong Yang, Weixin Xu, Yahong Yang, Xinxia Liu, Qizheng Su, Yangfan Zhang, Ji Wang, Xiang Luo, Mengjing Zhou, Weiping Luo, Haoran Ge
Summary: This study utilizes potassium ferrate and straw fiber to enhance the solidifying effect of cement and elaborate on the strength mechanisms. The presence of these two additives significantly improves the cement solidification strength and reduces the moisture content of the solidified body.
SCIENTIFIC REPORTS
(2023)
Article
Environmental Sciences
Yassir M. H. Mustafa, Omar S. Baghabra Al-Amoudi, Shamsad Ahmad, Mohammed Maslehuddin, Muhammad H. Al-Malack
Summary: The study utilized stabilization/solidification (S/S) technique to treat contaminated soils, demonstrating that all treated mixtures met the strength criterion of the U.S. Environmental Protection Agency (USEPA) and showed improvements in both geotechnical properties and environmental characteristics. Additionally, analyses using scanning electron microscope (SEM) with energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) were conducted to elucidate microstructural changes in the stabilized soils.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Qiusong Chen, Shiyuan Sun, Yunmin Wang, Qinli Zhang, Liming Zhu, Yikai Liu
Summary: In this study, a combination of NaOH pretreatment and ground-granulated blast furnace slag (GGBFS) additives was used to solidify phosphogypsum (PG) for cemented paste backfill (CPB) with a lower carbon footprint. The NaOH pretreatment effectively removed approximately 95% of F within the PG, resulting in more hydration products and effective F and P retention candidates. The addition of GGBFS promoted the generation of additional cement hydrates. The macro mechanical performance analysis showed that the mixtures of pretreated-PG-GGBFS exhibited excellent mechanical performance. Elemental mapping and toxicity characteristic leaching procedures demonstrated competitive F and P immobilization ability compared to typical OPC binder and individual GGBFS addition. This study opens up new perspectives for synergistic recycling of PG and GGBFS in a profitable and low carbon footprint way.
Review
Nuclear Science & Technology
Junfeng Li, Lei Chen, Jianlong Wang
Summary: This article discusses the use of cement as the most commonly used material for solidification of radioactive waste, includes introduction of various types of cements and summarization of the main parameters to characterize the performance of the solidified waste. It also analyzes the mechanisms for immobilization of radionuclides in cements.
PROGRESS IN NUCLEAR ENERGY
(2021)
Article
Engineering, Environmental
Yikai Liu, Simone Molinari, Maria Chiara Dalconi, Luca Valentini, Maurizio Pietro Bellotto, Giorgio Ferrari, Roberto Pellay, Graziano Rilievo, Fabio Vianello, Gabriella Salviulo, Qiusong Chen, Gilberto Artioli
Summary: A geochemical model combined with parametric fitting techniques was used to investigate the solidification/stabilization mechanisms of Pb-rich pyrite ash in ordinary Portland cement and calcium aluminate cement. The study revealed that ettringite and calcium silicate hydrates have strong affinities for Pb under alkaline conditions. When the hydration products are unable to stabilize all the soluble Pb, part of it may be immobilized as Pb(OH)2. Hematite from pyrite ash and newly-formed ferrihydrite, along with anglesite and cerussite precipitation, are the main controlling factors of Pb under acidic and neutral conditions. This work provides valuable insights for the development of more sustainable mixture formulations in solid waste remediation.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Katri Piekkari, Visa Isteri, Katja Ohenoja, Mirja Illikainen
Summary: Heavy metals escaping from industrial processes and industrial waste are a significant environmental hazard all around the globe. This study focuses on stabilization-solidification of a highly toxic industrial filter slag that contains a range of different heavy metals. The results show that mayenite has good potential for stabilization-solidification applications.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Multidisciplinary
Charalampos Pavlopoulos, Maria Kelesi, Dimitrios Michopoulos, Konstantina Papadopoulou, Theopisti Lymperopoulou, Agelliki Skaropoulou, Sotirios Tsivilis, Gerasimos Lyberatos
Summary: This study successfully addresses the safe disposal of waste from end of life (EoL) solar PVPs through stabilization in cement mortars, ensuring the environmentally friendly alternative can be secured.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2022)
Article
Environmental Sciences
Zhenjie Zou, Yinghong Qin, Tongsheng Zhang, Kanghao Tan
Summary: The study investigates the potential of a biochar-cement composite curing agent to enhance the properties of Pb2+ contaminated soil. The results show that the addition of biochar in cement significantly improves the strength of solidified soil and lowers its permeability and porosity. Additionally, the biochar-cement composite material efficiently treats highly concentrated Pb2+ contaminated soil.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Green & Sustainable Science & Technology
Xian Zhou, Zheng-fu Zhang, Chong-jun Bao, You cheng Yue, Jin-song Wang, Hui Yang, Man-jiao Chen, Yang Liu
Summary: Industrial non-ferrous metal smelting and processing contribute significantly to the migration of arsenic-containing minerals, posing a severe threat to human health. This study explores the potential for arsenic solidification and establishes the mechanisms using phosphate mineral systems. The results demonstrate the effectiveness of magnesium phosphate cement in inhibiting arsenic migration through coprecipitates and physical encapsulation.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Construction & Building Technology
Dezhi Zhao, Zheng Wang, Miao Wang, Shuang Lu, Lin Chi
Summary: A functionalized PP fiber (AM-PP) was prepared and used with cement to solidify hazardous solid wastes. The addition of AM-PP improved compressive strength of cement samples containing heavy metals and reduced the adverse effect of heavy metals on cement hydration. More hydration products were generated with the addition of AM-PP, especially in early age, leading to lower leaching of Cu2+, Zn2+, and Pb2+ from cement samples.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Green & Sustainable Science & Technology
Xingzhong Nong, Yuehua Liang, Shan Lin, Yi Lu, Zhi Shang
Summary: The purpose of this study is to investigate the hydro-mechanical properties of heavy metal contaminated soil stabilized using cement treatment under different salinity conditions. The results show that different metal fractions have different effects on the behavior of the soil specimen, and the hydraulic conductivity is compromised by a higher metal fraction. The type and fraction of metal ions affect the hydration reaction.
Article
Environmental Sciences
Suellen Tonatto Ferrazzo, Mariana Tonini de Araujo, Giovani Jordi Bruschi, Eduardo Pavan Korf, William Mateus Kubiaki Levandoski, Carolina Pereira dos Santos, Nilo Cesar Consoli
Summary: Waste stabilization processes are crucial in reducing environmental risks associated with metal contamination. This study compared the metal encapsulation efficiency of an alkali-activated binder and Portland cement in waste foundry sand. The results showed that the alkali-activated binder performed better in encapsulating heavy metals.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Construction & Building Technology
A. S. Pateriya, D. J. Robert, K. Dharavath, S. K. Soni
Summary: This study investigates the use of marble waste as a subgrade application in weak field soils through stabilization with fly ash based - Portland Pozzolana Cement (PPC) and reduce graphene oxide (rGO) powder. The modified matrix showed significant increase in strength compared to raw marble waste, indicating potential for replacing weak subgrade soil and providing an efficient waste management solution.
CONSTRUCTION AND BUILDING MATERIALS
(2022)