JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Yuxuan Yang,Zhaoping Zhong,Baosheng Jin,Bo Zhang,Haoran Du,Qian Li,Xiang Zheng,Renzhi Qi,Pengkun Ren
Increasing amounts of solid waste and sludge have created many environmental management problems. Pyrolysis can effectively reduce the volume of solid waste and sludge, but there is still the problem of heavy metal contamination, which limits the application of pyrolysis in environmental management. The intercalated-exfoliated modified vermiculite (IEMV) by intercalators of sodium dodecylbenzene sulfonate , hexadecyltrimethylammonium bromide and octadecyltrimethylammonium bromide were used to control the release of Cd, Cr, Cu, Zn and Pb during pyrolysis process of sludge or solid waste. The retention of heavy metals in sludge was generally better than that in solid waste. The IEMV by octadecyltrimethylammonium bromide as the intercalator calcined 800 °C (STAB-800) was the best additive for heavy metal retention, and the retention of Cr, Cu and Zn was significantly better than that of Pb and Cd. Cr, Cu, Zn and Pb were at low risk, while Cd had considerable risk under certain circumstances. New models were proposed to comprehensively evaluate the results of the risk and forms of heavy metals, and the increasing temperature was beneficial in reducing the hazards of heavy metals by the addition of STAB-800. The reaction mechanism of heavy metals with vermiculite was revealed by simulation of reaction sites, Fukui Function and Frontier Molecular Orbital. Thermal activation-intercalated-exfoliated modified vermiculite (T-IEMV) is more reactive and had more active sites for heavy metals. Mg atoms and outermost O atoms are the main atoms for T-IEMV to react with heavy metals. The Cr, Cu and Zn have better adsorption capacity by T-IEMV than Pb and Cd. This study provides a new insight into managing solid waste and sludge and controlling heavy metal environmental pollution .
研究领域:
环境科学
·
污染控制
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2024
·
IF 5.3
Fulong Cheng,Jie Pan,Changxin Zhao,Wei Li,Yuting Peng,Zuo Zhang,Yanjuan Lin,Guowen Chen
Pure hydrotalcite (LDH) materials prepared from chemical reagents have been investigated as solid-phase phosphorus (P) inactivation materials (SPIM) to manage endogenous P loading in sediments. However, the efficacy and mechanism of LDH mixtures prepared by natural minerals and solid wastes in controlling sediment P release are unclear. Therefore, a Ca/Mg-Al-LDH (CMA-LDH) material was synthesized using sepiolite and cans, and its efficacy, mechanism, and ecological impact in controlling sediment P release were investigated. CMA-LDH-p was prepared as a control material using pure chemical reagents. The CMA-LDH and CMA-LDH-p were both composed of hydrotalcite and hydrocalumite. The maximum P adsorption capacity of CMA-LDH was 123.01 mg/g, comparable to that of CMA-LDH-p. The adsorbed P by CMA-LDH was mostly in the stable P form, accounting for 87.2 % of the total P. The adsorption capacity and immobilization ability of CMA-LDH for P were superior to other reported LDH-based SPIM. Both the CMA-LDH addition and capping successfully blocked sediment P release under anaerobic conditions. Passivation of mobile P in the sediment and DGT-labile P in the interstitial water was critical to preventing sediment P release by the CMA-LDH addition. The CMA-LDH capping inhibited sediment P release through the effective adsorption of CMA-LDH on DGT-labile P at the sediment/overlying water interface. The CMA-LDH addition and capping affected the abundance of microbial communities associated with iron and sulfur cycling, which might affect the stability of endogenous P. These results confirmed that CMA-LDH addition and capping treatments were effective methods for managing sediment P loading.
研究领域:
环境科学
·
生态学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2022
·
IF 8.91
Hua Long,Xinyu Huang,Meijia Liu,Changhao Cui,Li Li,Yang Liao,Dahai Yan
The improper disposal of large amounts of solid waste (SW) has led to serious ecological and environmental problems, especially heavy metal (HM) pollution. Converter steelmaking has the potential to co-process SW, but the distribution of heavy metals (HMs) during converter steelmaking is unclear. In this study, the effects of smelting temperature and slag alkalinity on the distribution of typical HMs in the SW of steel samples, steel slag , and the gas phase were investigated in a specially-made induction furnace. The results showed that upon increasing the smelting temperature, As (As 2 S 3 ) was mainly distributed in the steel sample, and the HM-containing compounds Cr 2 O 3 , CrCl 3 , ZnCl 2 , ZnS, ZnO, PbCl 2 , PbS, and PbO were mainly distributed in the gas phase. Upon increasing the alkalinity within a certain range, the distribution of HMs in steel samples and steel slag increased gradually, while their distribution in the gas phase decreased. Thermodynamic calculations , Eh-pH diagrams, XRD patterns, and XPS spectra indicated that impurity elements in the hot metal and the CaO content affected the chemical reactions by which HM-containing compounds in the steel sample formed elemental HMs and those in steel slag existed as oxides; therefore, it is necessary to choose a suitable temperature and alkalinity for slag when disposing of different types of SW.
研究领域:
环境科学
·
冶金工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CEMENT AND CONCRETE RESEARCH
·
2024
·
IF 10.9
Lu Zhu,Hanxiong Lyu,Yang Liu,Shipeng Zhang,Chi Sun Poon
Solid waste derived clinker design methodology was established based on thermodynamic simulation and experiment validation via the recycling of incinerated sewage sludge ash (ISSA) and recycled concrete fine (RCF). Compared with 1000 °C and 1100 °C, 1200 °C was the optimum temperature for C 2 S-rich clinker synthesis due to the highest simulated belite content after sintering. A utilization rate of 95 % was achieved, accomplishing the maximization of solid waste recycling. Due to the CaCO 3 phase formation by the reaction of high-content belite (46.8 %) with CO 2 , carbonated 1200ARS eco-cement showed higher compressive strength than OPC and other eco-cements. The lowest porosity (18.1 %) with dense microstructure was also obtained by carbonated 1200ARS. Benefiting from the high CO 2 reactivity of belite, 1200ARS displayed the optimum CO 2 sequestration capacity with a higher carbonation degree (30.1 %) than other batches, providing a promising direction for future development of the low-carbon cement industry to achieve environmental sustainability.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2024
·
IF 5.8
Ke Yang,Kai Wu,Bo Zhang,Sheng Chu,Fangzhou Li,Mingfan Li,Jiajun Yu,Huiyan Zhang
Biomass is the only renewable carbon-containing resource, which could be converted into high-value liquid fuel via catalytic fast pyrolysis (CFP) using zeolite catalysts. The development of ZSM-5 synthesis technology based on low-cost raw materials is crucial for industrial-scale production of ZSM-5 zeolites. In this study, we report a solvent-free route for synthesizing ZSM-5 zeolites from two solid wastes: spent fluid catalytic cracking (sFCC) catalyst and rice husk ash (RHA). The effect of ZSM-5 zeolites derived from various raw materials (individual RHA, sFCC catalyst, and their combination) on the conversion of cellulose into aromatics are investigated in a fixed bed reactor. Cellulose catalytic pyrolysis using the zeolite derived from the combination of RHA and sFCC catalyst (R/F-Zeolite) demonstrates a significant enhancement in the production of aromatics compared to using individual raw materials. When mixing 25 % R/F-Zeolite with 75 % commercial ZSM-5, the total yield of BTX (benzene, toluene, and xylene) increases by 16 % compared to using individual commercial ZSM-5, with a 37 % and 17 % increase in the yield of benzene and toluene, respectively. Moreover, R/F-Zeolite has a better performance of coke resistance than commercial ZSM-5. This work offers a cost-effective solution for the industrial-scale synthesis of ZSM-5 zeolites to produce aromatic-rich biofuel, which also brings benefits in terms of waste disposal.
研究领域:
生物质能
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催化材料
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Wanting Zou,Wenhua Zhang,Yilin Pi,Yunsheng Zhang,Yuan Chen,Lei Zhang
Solid wastes, such as municipal solid waste incineration fly ash (MSWI FA) and tailings, contain a large number of harmful components, which makes harmless and recycling treatment a challenge. Through high-temperature reconstruction, the solid waste containing heavy metals is prepared into glass-ceramics, which is an effective method to realize the harmless and resource utilization of solid waste. In this work, glass-ceramics were successfully prepared by using MSWI FA, waste glass, and lead-zinc tailings. The utilization rate of solid waste reached 91.74%. The coupling mechanism of heavy metals with Fe as the dominant factor and Zn, Cu, and Pb coexisting was explored. The results showed that the critical threshold of sintering temperature was 1000 °C. The properties of glass-ceramics can be greatly optimized when the temperature was higher than 1000 °C. Fe played a leading role in the migration and solidification process. Because of its higher displacement capacity, Fe was preferentially solidified in the form of hedenbergite and magnetite. Zn, Cu, and Pb solidified in the form of (Mg,Fe,Zn,Cu)Fe 2 O 4 and Pb 2+ respectively. The order of stabilization effect was Fe > Zn > Cu > Pb. All leaching concentrations of heavy metals were lower than the standard threshold, even if the heavy metals reached 20 wt%.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Pengcheng Li,Ziyi Liu,Mingxing Zhao,Hengfeng Miao,Wansheng Shi,Zhenxing Huang,Wenquan Ruan
One of the major challenges of anaerobic codigestion (AcoD) treatment of municipal solid waste (MSW) is the low efficiency of electron transfer between syntrophic bacteria and methanogens. In this study, an effective strategy to improve the methanogenesis efficiency during tridigestion of food waste (FW), kitchen waste (KW), and fruit/vegetable waste (FVW), via adding magnetite to promote direct interspecies electron transfer (DIET), was proposed. The results showed that the accumulative methane yield increased with the addition of magnetite and the maximum cumulative methane yield was 592.56 mL/gVS at the dosage of 6 g/L and was 31.97% higher than control. Magnetite significantly accelerated the degradation of volatile fatty acids (VFAs), such as acetic, propionic, and butyric acids. Electrochemical measurements and scanning electron microscopy (SEM) analyses showed that magnetite attached to the surface of the sludge and improved the redox capacity of inoculated sludge; the values of electron-donating capacity (EDC) and electron-accepting capacity (EAC) increased by 21.58 and 23.69%, respectively. Microbial community analysis revealed that the dominant bacteria were Chloroflexi, Firmicutes, and Actinobacteria. The growth of Methanosaeta and Methanosarcina was promoted after adding magnetite to the system, which also contributes to the enhanced methane production via involving in DIET during the anaerobic tridigestion process.
研究领域:
环境生物学
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微生物学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2023
·
IF 3.9
Xia Hua,Zhihong Gao,Yufei Shi,Wenming Hao,Xuguang Liu,Ruifeng Li
In this work, the “host-guest” combination has been conducted upon the utilization of dual industrial solid wastes, namely, spent FCC catalyst and red mud. The host of cancrinite zeolite was successfully synthesized under the optimum conditions of pre-treatment temperature of 500 °C for 4 h, spent FCC catalyst to NaOH of 0.8 (mass ratio), nitric acid to red mud of 5 (volume/mass), 140 °C for 12 h. The as-synthesized cancrinite sample had the maximum specific surface area of 251 m 2 /g, resulting in the relative leachability for Ni 2+ (0.03%) and V 2+ (0.38%) much better than that of spent FCC catalyst. The “host-guest” rule was discussed to reveal the mechanism for heavy metal ions stabilized into cancrinite zeolite. The feasibility (sources, synthesis methods , energy consumption and performance) of the present study was evaluated on a medium level by comparison with other literatures. Finally, the cost assessment of cancrinite zeolite was checked and the production cost was about 8 $/kg, decreasing the production price by at least 95% compared to commercial zeolites. Thus, the present study showed the feasibility and potential of solid wastes for stabilizing heavy metal ions, particularly in an advantage of the cost-effectiveness.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Sustainability
·
2025
·Vol. 17
·期 6
·2469
·
IF 3.3
Huidong Tang,Jiacheng Bao,Chen Liu,Yuwen Deng,Yixing Ma,Lei Shi,Shuangyou Bao,Kai Li,Ping Ning,Xin Sun
In pursuing sustainable environmental solutions, the concept of ‘waste to treasure’ has emerged as a promising approach. In this study, a new process is proposed to combine solid copper slag with hydrogen peroxide (H2O2) to remove nitrogen oxides (NOx) from acidic exhaust gases, thus effectively utilizing waste materials. Firstly, different smelting slags were screened to determine the catalytic potential of copper slag for hydrogen peroxide. Subsequently, the catalytic activity of the copper slags at various stages of the copper smelting process was thoroughly evaluated and optimized. In addition, a multifactorial evaluation of slow-cooled copper slag catalysts for removing NOx was carried out. Preliminary indications are that the iron phase in the copper slag is identified as the main source of catalytic activity sites. The results suggest that Fe2+/Fe3+sites on the surface of the Fe phase in the slow-cooled copper slag may be crucial in improving the NOx removal efficiency. The main reactive oxygen species detected in the system were ·OH, ·O2⁻, and1O2. In addition, the transformation products, formation pathways, and reaction mechanisms of NO in the liquid phase were initially investigated and determined. This study provides a green and sustainable path for the utilization of solid waste and management of atmospheric fumes in the non-ferrous metal industry and offers new perspectives to address environmental challenges in industrial processes.
研究领域:
环境科学
·
冶金工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Environmental Research
·
2022
·Vol. 16
·期 2
·1-12
·
IF 3.229
Tan Mengyu,Sun Yue,Gui Jiaxi,Wang Jingli,Chen Xu,Wu Donglei
Plastics are common raw materials of products originating from human activities. Their physical nature may include disintegrated small granules or fragments with particle size less than 5 mm—microplastics (MPs) which are considered as emerging contaminant in the environment. Previous research has demonstrated that organic solid waste (OSW) was contaminated by microplastics. Subsequent to biological treatment, OSW products such as compost and biogas residues would be mixed the soil as fertilizers or conditioners; while, the MPs in these OSW would also enter the soil at the same time, imparting potential ecological risks. Thus, it is important to detect the MPs in biologically treated OSW products. However, it was unknown whether some of the digestion and separation methods could be used to effectively extract MPs in these typical OSW, limiting the research on MP abundance in these OSW and restricting the comparability of relevant studies. Therefore, the present study compared the effects of seven digestion protocols on the MPs and organic matter, and the most suitable protocol containing 30% (v/v) H 2 O 2 was determined. Furthermore, the recovery rates of spiked MPs were used to evaluate three separation methods. The results showed that the two-stage density separation of NaCl solution (ρ = 1.19 g·cm −3 ) and NaBr solution (ρ = 1.53 g·cm −3 ) was optimal, and the recovery rate of spiked MPs by two-stage density separation was higher than 86%. Based on these results, the scheme of “30% (v/v) H 2 O 2 pretreatment and two-stage density separation” was constructed for MPs extraction from biologically treated products of OSW, which could be applied to the related studies.
研究领域:
环境科学
·
生物学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yan Xia,Zhenye Liu,Zhenhao Song,Ruolin Zhao,Jinpeng Wu,Lei Wang,Jianhua Yan
Municipal solid waste incineration fly ash (MSWIFA) is a hazardous waste with high alkalinity and is rich in heavy metals (HMs) and chlorine. To facilitate resource disposal, this paper proposes recycle MSWIFA as an alkali activator to develop low-carbon and cement-free alkali-activated materials. The designed MSWIFA-activated slag exhibited impressive compressive strength (>70 MPa). The microstructure of the MSWIFA-activated slags was tightly filled with various reaction products, including ettringite, calcium aluminosilicate hydrate (C-A-S-H), and Friedel’s salt. The leaching behaviors of the HMs and chlorine were significantly restricted owing to the chemical fixation of the reaction products and the dense microstructure of the MSWIFA-activated slags. The immobilization of chlorine primarily depended on the formation of Friedel’s salt, and the remaining chlorine could be captured by the positively charged sites of C-A-S-H. The reaction mechanism of the designed MSWIFA-activated slags could be divided into three stages: ettringite precipitation, C-A-S-H formation, and Friedel’s salt generation. This paper provides constructive insights into the resource utilization of hazardous waste and contributes to the development of low-carbon alkali-activated materials.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 14
·2959
·
IF 4.967
Jun Wang,Xiaocui Wen,Shaojun Jiang,Tao Chen
Inappropriate disposal of leaching residues from the lead-zinc tailings recovery process may result in environmental pollution. Its recycling and reuse remain a prevalent topic in environmental science and technology. It was roasted to prepare leaching residues-based materials (TLRS) in this work, and the TLRS were creatively used as the catalyst to active sodium persulfate (PS) to degrade organic pollutants. Degradation of tetracycline using the TLRS–PS system was evaluated, and the treating parameters were optimized. Roasting resulted in the exposure of active sites on TLRS surface, in which transition metals can donate electrons to PS to form SO4·−. SO4·−can further react with OH−to form ·OH. Formation of these radicals was confirmed by both quenching experiments and EPR analysis. Under optimized conditions, 85% of the TC can be degraded in 3.0 h, and ~50% of degraded TC was mineralized to CO2and H2O. The performance of TLRS barely changed after four reuses, suggesting the chemical stability of TLRS. The presence of dissolved substance in the water matrix could weaken the performance of the TLRS–PS system. A mechanism of TC degradation was proposed based on the experimental results and literature. These preliminary results provide us new insight on the reuse of lead-zinc flotation tailings.Keywords:leaching residues;tetracycline;persulfate activation;oxidative degradation;solid waste
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）