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Optimizing Household Wastes (Rice, Vegetables, and Fruit) as an Environmentally Friendly Electricity Generator
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作者 Deni Ainur Rokhim Isma Yanti Vitarisma +2 位作者 Sumari Sumari Yudhi Utomo Muhammad Roy Asrori 《Journal of Renewable Materials》 EI CAS 2024年第2期275-284,共10页
The high consumption of electricity and issues related to fossil energy have triggered an increase in energy prices and the scarcity of fossil resources.Consequently,many researchers are seeking alternative energy sou... The high consumption of electricity and issues related to fossil energy have triggered an increase in energy prices and the scarcity of fossil resources.Consequently,many researchers are seeking alternative energy sources.One potential technology,the Microbial Fuel Cell(MFC)based on rice,vegetable,and fruit wastes,can convert chemical energy into electrical energy.This study aims to determine the potency of rice,vegetable,and fruit waste assisted by Cu/Mg electrodes as a generator of electricity.The method used was a laboratory experiment,including the following steps:electrode preparation,waste sample preparation,incubation of the waste samples,construction of a reactor using rice,vegetable,and fruit waste as a source of electricity,and testing.The tests included measuring electrical conductivity,electric current,voltage,current density,and power density.Based on the test results,the maximum current and voltage values for the fruit waste samples were 5.53 V and 11.5 mA,respectively,with a current density of 2.300 mA/cm^(2) and a power density of 12.719 mW/cm^(2).The results indicate the potential for a future development.The next step in development involves determining the optimum conditions for utilizing of rice,vegetable,and fruit waste.The results of the electrical conductivity test on rice,vegetable,and fruit waste samples were 1.51,2.88,and 3.98 mS,respectively,with the highest electrical conductivity value found in the fruit waste sample. 展开更多
关键词 Electrical energy fruit waste rice waste vegetable waste
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Bird’s-eye view of recycled solid wastes in road engineering
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作者 Zhuangzhuang Liu Tengteng Feng +5 位作者 Xingyi Zhu Jie Gao Kui Hu Meng Guo Fan Gu Feng Li 《Journal of Road Engineering》 2024年第2期93-150,共58页
Recent trends in road engineering have explored the potential of incorporating recycled solid wastes into infrastructures that including pavements,bridges,tunnels,and accessory structures.The utilization of solid wast... Recent trends in road engineering have explored the potential of incorporating recycled solid wastes into infrastructures that including pavements,bridges,tunnels,and accessory structures.The utilization of solid wastes is expected to offer sustainable solutions to waste recycling while enhancing the performance of roads.This review provides an extensive analysis of the recycling of three main types of solid wastes for road engineering purposes:industrial solid waste,infrastructure solid waste,and municipal life solid waste.Industrial solid wastes suitable for road engineering generally include coal gangue,fly ash,blast furnace slag,silica fume,and steel slag,etc.Infrastructure solid wastes recycled in road engineering primarily consist of construction&demolition waste,reclaimed asphalt pavements,and recycled cement concrete.Furthermore,recent exploration has extended to the utilization of municipal life solid wastes,such as incinerated bottom ash,glass waste,electronics waste,plastic waste,and rubber waste in road engineering applications.These recycled solid wastes are categorized into solid waste aggregates,solid waste cements,and solid waste fillers,each playing distinct roles in road infrastructure.Roles of solid waste acting aggregates,cements,and fillers in road infrastructures were fully investigated,including their pozzolanic properties,integration effects to virgin materials,modification or enhancement solutions,engineering performances.Utilization of these materials not only addresses the challenge of waste management but also offers environmental benefits aiming carbon neutral and contributes to sustainable infrastructure development.However,challenges such as variability in material properties,environmental impact mitigation,secondary pollution to environment by leaching,and concerns regarding long-term performance need to be further addressed.Despite these challenges,the recycled solid wastes hold immense potential in revolutionizing road construction practices and fostering environmental stewardship.This review delves into a bird’seye view of the utilization of recycled solid wastes in road engineering,highlighting advances,benefits,challenges,and future prospects. 展开更多
关键词 Road engineering Industrial solid waste Infrastructure solid waste Municipal life waste Recycled materials
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CO_(2) mineralization by typical industrial solid wastes for preparing ultrafine CaCO_(3): A review
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作者 Run Xu Fuxia Zhu +8 位作者 Liang Zou Shuqing Wang Yanfang Liu Jili Hou Chenghao Li Kuntong Song Lingzhao Kong Longpeng Cui Zhiqiang Wang 《Green Energy & Environment》 SCIE EI CAS CSCD 2024年第11期1679-1697,共19页
Mineral carbonation is a promising CO_(2) sequestration strategy that can utilize industrial wastes to convert CO_(2) into high-value CaCO_(3).This review summarizes the advancements in CO_(2) mineralization using typ... Mineral carbonation is a promising CO_(2) sequestration strategy that can utilize industrial wastes to convert CO_(2) into high-value CaCO_(3).This review summarizes the advancements in CO_(2) mineralization using typical industrial wastes to prepare ultrafine CaCO_(3).This work surveys the mechanisms of CO_(2) mineralization using these wastes and its capacities to synthesize CaCO_(3),evaluates the effects of carbonation pathways and operating parameters on the preparation of CaCO_(3),analyzes the current industrial application status and economics of this technology.Due to the large amount of impurities in solid wastes,the purity of CaCO_(3) prepared by indirect methods is greater than that prepared by direct methods.Crystalline CaCO_(3) includes three polymorphs.The polymorph of CaCO_(3) synthesized by carbonation process is determined the combined effects of various factors.These parameters essentially impact the nucleation and growth of CaCO_(3) by altering the CO_(2) supersaturation in the reaction system and the surface energy of CaCO_(3) grains.Increasing the initial pH of the solution and the CO_(2)flow rate favors the formation of vaterite,but calcite is formed under excessively high pH.Vaterite formation is favored at lower temperatures and residence time.With increased temperature and prolonged residence time,it passes through aragonite metastable phase and eventually transforms into calcite.Moreover,polymorph modifiers can decrease the surface energy of CaCO_(3) grains,facilitating the synthesis of vaterite.However,the large-scale application of this technology still faces many problems,including high costs,high energy consumption,low calcium leaching rate,low carbonation efficiency,and low product yield.Therefore,it is necessary to investigate ways to accelerate carbonation,optimize operating parameters,develop cost-effective agents,and understand the kinetics of CaCO_(3) nucleation and crystallization to obtain products with specific crystal forms.Furthermore,more studies on life cycle assessment(LCA)should be conducted to fully confirm the feasibility of the developed technologies. 展开更多
关键词 Industrial solid wastes Resource utilization Mineral carbonation Ultrafine CaCO_(3) Carbon emission reduction
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Soil properties in reclaimed farmland by filling subsidence basin due to underground coal mining with mineral wastes in China 被引量:14
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作者 程伟 卞正富 +1 位作者 董霁红 雷少刚 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第8期2627-2635,共9页
Reclaimed mining-induced subsidence area soils (RMSs) could restore soil quality and crop productivity in coal mining area. This study was conducted to evaluate the effects of mineral-processing wastes (fly ash vs coa... Reclaimed mining-induced subsidence area soils (RMSs) could restore soil quality and crop productivity in coal mining area. This study was conducted to evaluate the effects of mineral-processing wastes (fly ash vs coal gangue) as backfill substrates on soil chemical and microbial properties in mining-induced subsidence area. A general higher water holding capacity (WHC) and pH had been observed in fly ash than coal gangue reconstructed soil. Soil microbial biomass C (MBC) and N (MBN), MBC/TOC (total organic carbon) ratio (qmic) were higher under the influence of the fly ash, while contents of As, Cr, C/Nbio, the basal respiration per unit of microbial biomass (QCO2) were higher under the coal gangue reconstructed mode in 0-10, 10-20, 20-50 cm layers. The microbial basal respiration was higher in 0-10, 10-20, 0-50 cm layers, while was lower in 20-50 cm layer under fly ash than that of coal gangue reconstructed mode. The lower QCO2 of fly ash mine soil suggested the lower maintenance energy requirement of the microbial community. Moreover, the contents of metals may possibly have negative implications for soil microbial and enzyme activities in reconstructed soil. 展开更多
关键词 reconstructed mine soil mineral-processing wastes microbial biomass enzyme activities
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Adsorption characteristics of Pb from urban stormwater runoff by construction wastes 被引量:5
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作者 杨丽琼 王建龙 +1 位作者 张晓然 车伍 《Journal of Southeast University(English Edition)》 EI CAS 2014年第2期212-219,共8页
Construction wastes were selected as the adsorbents and static and dynamic adsorption batch experiments were carried out to investigate the adsorption of Pb to construction wastes with different particle size gradatio... Construction wastes were selected as the adsorbents and static and dynamic adsorption batch experiments were carried out to investigate the adsorption of Pb to construction wastes with different particle size gradations in the simulated stormwater runoff system.The experimental results show that the pseudo-second-order kinetics model can better characterize the adsorption process of Pb than the pseudo-first-order kinetics model.The adsorption equilibrium data can be well fitted by the Freundlich isotherm model. The construction wastes with different tested size gradations can greatly remove Pb from stormwater runoff and their average removal rate can reach up to 99%.The construction wastes with narrow size distribution can better remove Pb but with worse permeability than those with wide size distribution. The particle size gradation of construction wastes greatly influences the equilibrium time rate and the capacity of Pb adsorption.The equilibrium adsorption rate and capacity are 18.1 μg/min and 5.5 μg/g respectively for the construction wastes with the size of 2.36 to 4.75 mm which are the greatest among the different size gradations.The present study provides a scientific basis for effectively controlling Pb pollution from stormwater runoff and the construction wastes resource utilization. 展开更多
关键词 stormwater runoff heavy metal construction waste ADSORPTION
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Environmental risk assessment on slag and iron-rich matte produced from reducing-matting smelting of lead-bearing wastes and iron-rich wastes 被引量:3
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作者 柴立元 吴见珣 +2 位作者 吴延婧 唐朝波 杨卫春 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第10期3429-3435,共7页
A new process for utilization of hazardous lead-bearing wastes and iron-rich wastes by reducing-matting smelting has been developed.The slag(SG) and the iron-rich matte(IRM) are the main by-products from reducing-... A new process for utilization of hazardous lead-bearing wastes and iron-rich wastes by reducing-matting smelting has been developed.The slag(SG) and the iron-rich matte(IRM) are the main by-products from reducing-matting smelting of lead-bearing wastes and iron-rich wastes.The environmental risk of heavy metals(Cd,Zn,Pb and As) in the main by-products versus the charging material for reducing-matting smelting(CM) has been systematically assessed using leaching toxicity test,the three-stage sequential extraction procedure of European Community Bureau of Reference(BCR) and Hakanson Potential Ecological Risk Index Method(PERI).The results demonstrate that the ecological risk level of heavy metals for SG and IRM is significantly reduced after the reducing-matting smelting process compared with that for CM. 展开更多
关键词 reducing-matting smelting lead-bearing waste heavy metal environmental risk
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Problems of Identification according to National Catalogue of Hazardous Wastes 被引量:3
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作者 唐红侠 《Agricultural Science & Technology》 CAS 2014年第10期1830-1832,共3页
ldentification work of solid wastes ’ risks is a kind of improvement and amendment for environmental impact assessment document of constructed projectss. ln the research, waste identification is classified as per ent... ldentification work of solid wastes ’ risks is a kind of improvement and amendment for environmental impact assessment document of constructed projectss. ln the research, waste identification is classified as per entrustment source and the characteristics of pol ution accidents are analyzed, with major problems of National Catalogue of Hazardous Wastes and countermeasures proposed. 展开更多
关键词 Solid waste Hazardous waste ldentification COUNTERMEASURES
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Research Advances in Agricultural Reutilization of Urban-rural Organic Wastes 被引量:1
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作者 吴荣 刘善江 杜颖 《Agricultural Science & Technology》 CAS 2016年第2期424-427,共4页
The author summarized the advantages and potential risks of urban-rural organic wastes agricultural reutilization to reduce the potential risks of urban-rural organic wastes agricultural utilization. The results showe... The author summarized the advantages and potential risks of urban-rural organic wastes agricultural reutilization to reduce the potential risks of urban-rural organic wastes agricultural utilization. The results showed that: the organic wastes generated in urban-rural life as fertilizer applied into farmland made an impact on soil properties, then indirectly affected the soil microbial biomass and soil enzymes activities. In addition, the heavy metals in organic wastes would accumulate in the soil and damage to soil environment. Therefore, it was necessary to make a long- term research on the environment of soil which agricultural utilized of wastes. 展开更多
关键词 Organic wastes Agricultural Utilization Heavy Metals Soil Microbial Soil Enzymes
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Start-up performances of dry anaerobic mesophilic and thermophilic digestions of organic solid wastes 被引量:19
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作者 LU Shu-guang IMAI Tsuyoshi +1 位作者 UKITA Masao SEKINE Masahiko 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2007年第4期416-420,共5页
Two dry anaerobic digestions of organic solid wastes were conducted for 6 weeks in a lab-scale batch experiment for investigating the start-up performances under mesophilic and thermophilic conditions. The enzymatic a... Two dry anaerobic digestions of organic solid wastes were conducted for 6 weeks in a lab-scale batch experiment for investigating the start-up performances under mesophilic and thermophilic conditions. The enzymatic activities, i.e., β-glucosidase, N-α-benzoyl-Largininamide (BAA)-hydrolysing protease, urease and phosphatase activities were analysed. The BAA-hydrolysing protease activity during the first 2-3 weeks was low with low pH, but was enhanced later with the pH increase. β-Glucosidase activity showed the lowest values in weeks 1-2, and recovered with the increase of BAA-hydrolysing protease activity. Acetic acid dominated most of the total VFAs in thermophilic digestion, while propionate and butyrate dominated in mesophilic digestion. Thermophilic digestion was confirmed more feasible for achieving better performance against misbalance, especially during the start-up period in a dry anaerobic digestion process. 展开更多
关键词 anaerobic digestion enzymatic activity MESOPHILIC solid wastes THERMOPHILIC
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Influence of lactic acid on the two-phase anaerobic digestion of kitchen wastes 被引量:12
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作者 ZHANG Bo CAI Wei-min HE Pin-jing 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2007年第2期244-249,共6页
To evaluate the influence of lactic acid on the methanogenesis, anaerobic digestion of kitchen wastes was firstly conducted in a two-phase anaerobic digestion process, and performance of two digesters fed with lactic ... To evaluate the influence of lactic acid on the methanogenesis, anaerobic digestion of kitchen wastes was firstly conducted in a two-phase anaerobic digestion process, and performance of two digesters fed with lactic acid and glucose was subsequently compared. The results showed that the lactic acid was the main fermentation products of hydrolysis-acidification stage in the two-phase anaerobic digestion process for kitchen wastes. The lactic acid concentration constituted approximately 50% of the chemical oxygen demand (COD) concentration in the hydrolysis-acidification liquid. The maximum organic loading rate was lower in the digester fed with lactic acid than that fed with glucose. Volatile fatty acids (VFAs) and COD removal were deteriorated in the methanogenic reactor fed with lactic acid compared to that fed with glucose. The specific methanogenic activity (SMA) declined to 0.343 g COD/(gVSS-d) when the COD loading were designated as 18.8 g/(L-d) in the digester fed with lactic acid. The propionic acid accumulation occurred due to the high concentration of lactic acid fed. It could be concluded that avoiding the presence of the lactic acid is necessary in the hydrolysis-acidification process for the improvement of the two-phase anaerobic digestion process of kitchen wastes. 展开更多
关键词 lactic acid kitchen wastes anaerobic digestion METHANOGENESIS
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Preparation and characterization of high-strength calcium silicate boards from coal-fired industrial solid wastes 被引量:14
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作者 Zhao Cao Yong-dan Cao +2 位作者 Jin-shan Zhang Chun-bao Sun Xian-long Li 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2015年第8期892-900,共9页
To realize the comprehensive utilization of coal-fired industrial solid wastes, a novel high-strength board was prepared from calcium silicate slag, fly ash, and flue gas desulfurization(FGD) gypsum. The changes in mi... To realize the comprehensive utilization of coal-fired industrial solid wastes, a novel high-strength board was prepared from calcium silicate slag, fly ash, and flue gas desulfurization(FGD) gypsum. The changes in mineral phases, chemical structure, and morphology during hydration were investigated by X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), and scanning electron microscopy(SEM). A traditional board made from quartz and lime was prepared as a reference. The novel board not only consumes a lot of solid wastes, but also meets the strength requirement of the class-five calcium silicate board according to the Chinese Standard JC/T 564.2—2008. Microanalysis showed that hydrated calcium silicate gel(C-S-H(I)), ettringite, tobermorite, and xonotlite were successively generated in the novel board by synergistic hydration of the mixed solid wastes. The board strength was improved by the formation of tobermorite and xonotlite but decreased by unhydrated quartz. It was demonstrated that quartz was not completely hydrated in the traditional board. As a result, the flexural strength of the traditional board was much lower than that of the novel board. 展开更多
关键词 solid waste recycling board manufacture calcium si
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Laboratory scale studies on removal of chromium from industrial wastes 被引量:6
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作者 M.A.Baig Mohsin Mir +1 位作者 Shazad Murtaza Zafar I. Bhatti 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2003年第3期417-422,共6页
Chromium being one of the major toxic pollutants is discharged from electroplating and chrome tanning processes and is also found in the effluents of dyes, paint pigments, manufacturing units etc. Chromium exists in a... Chromium being one of the major toxic pollutants is discharged from electroplating and chrome tanning processes and is also found in the effluents of dyes, paint pigments, manufacturing units etc. Chromium exists in aqueous systems in both trivalent (Cr 3+) and hexavalent (Cr 6+) forms. The hexavalent form is carcinogenic and toxic to aquatic life, whereas Cr 3+ is however comparatively less toxic. This study was undertaken to investigate the total chromium removal from industrial effluents by chemical means in order to achieve the Pakistan NEQS level of 1 mg/L by the methods of reduction and precipitation. The study was conducted in four phases. In phase Ⅰ, the optimum pH and cost effective reducing agent among the four popular commercial chemicals was selected. As a result, pH of 2 was found to be most suitable and sodium meta bisulfate was found to be the most cost effective reducing agent respectively. Phase Ⅱ showed that lower dose of sodium meta bisulfate was sufficient to obtain 100 % efficiency in reducing Cr 6+ to Cr 3+, and it was noted that reaction time had no significance in the whole process. A design curve for reduction process was established which can act as a tool for treatment of industrial effluents. Phase Ⅲ studies indicated the best pH was 8.5 for precipitation of Cr 3+ to chromium hydroxide by using lime. An efficiency of 100 % was achievable and a settling time of 30 minutes produced clear effluent. Finally in Phase Ⅳ actual waste samples from chrome tanning and electroplating industries, when precipitated at pH of 12 gave 100 % efficiency at a settling time of 30 minutes and confirmed that chemical means of reduction and precipitation is a feasible and viable solution for treating chromium wastes from industries. 展开更多
关键词 tannery waste EFFLUENTS reduction PRECIPITATION efficiency CHROMIUM
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Formation cause,composition analysis and comprehensive utilization of rare earth solid wastes 被引量:9
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作者 许涛 彭会清 《Journal of Rare Earths》 SCIE EI CAS CSCD 2009年第6期1096-1102,共7页
Based on practical situation of rare earth industrial chain,production process and rare earth materials that could produce solid wastes on batch were discussed.Formation cause,formation volume,composition analysis and... Based on practical situation of rare earth industrial chain,production process and rare earth materials that could produce solid wastes on batch were discussed.Formation cause,formation volume,composition analysis and comprehensive utilization of the solid wastes of rare earth hydrometallurgy slag,electrolysis slag,Fe-based rare earth permanent magnetic materials,Co-based rare earth permanent magnetic materials,rare earth hydrogen storage materials,rare earth polishing powders and rare earth catalysts were ... 展开更多
关键词 rare earths solid wastes comprehensive utilization
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Co-inhibition of methanogens for methane mitigation in biodegradable wastes 被引量:12
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作者 ZHAO Tiantao ZHANG Lijie +1 位作者 CHEN Haoquan ZHAO Youcai 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2009年第6期827-833,共7页
The inhibition effects and mechanisms of chlorinated methane and acetylene on methanogenesis in the anaerobic digestion process of the biodegradable wastes were investigated.It was found that both chloroform and acety... The inhibition effects and mechanisms of chlorinated methane and acetylene on methanogenesis in the anaerobic digestion process of the biodegradable wastes were investigated.It was found that both chloroform and acetylene could effectively inhibit methanogens while the biodegradability of the wastes was not affected.Acetylene inhibited the activity of methanogens,while chloroform inhibited metabolic process of methanogenesis.A central composite design(CCD) and response surface regression analysis(RSREG) were employed to determine the optimum conditions and interaction effects of chloroform and acetylene in terms of inhibition effciency,production of volatile fatty acids(VAF) and molar ratio of propionic acid to acetic acid.Chloroform had significant effect on enhancing the production of VFA(F = 121.3;p 〈 0.01),and acetylene promoted the inhibition effciency(F = 99.15;p 〈 0.05) more effectively than chloroform(F = 9.72;p 〉 0.05).In addition,a maximum molar ratio of propionic acid to acetic acid of 1.208 was estimated under the optimum conditions of chloroform concentration of 9.05 mg/kg and acetylene concentration of 3.6×10^-3(V/V).Hence,methanogens in the wastes can be inhibited while the stabilization process of the biodegradable wastes can still work well,as propionic acid generated during the inhibition process could hardly be utilized by methanogens. 展开更多
关键词 METHANOGENESIS biodegradable wastes inhibition mechanism response surface regression analysis stabilization process
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Volatilization of heavy metals during incineration of municipal solid wastes 被引量:7
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作者 SUNLu-shi S.Abanades +2 位作者 J.D.Lu G.Flamant D.Gauthier 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2004年第4期635-639,共5页
Incineration experiments with MSW, which had been impregnated with heavy metals, were presented to obtain information on the volatilization behavior of the elements cadmium(Cd), lead(Pb), and zinc(Zn) under different ... Incineration experiments with MSW, which had been impregnated with heavy metals, were presented to obtain information on the volatilization behavior of the elements cadmium(Cd), lead(Pb), and zinc(Zn) under different conditions. Experiments were carried out in a bubbling fluid bed system connected to a customized inductively coupled plasma optical emission spectroscopy(ICP-OES) for analyzing metals in the flue gas. The results indicated that the combustion temperature, the gas atmosphere, and the chlorine content in the flue gas could affect the volatilization behavior of heavy metals. In the fluidized bed combustion, a large surface area was provided by the bed sand particles, and they may act as absorbents for the gaseous ash-forming compound. Comparer with the metals Cd and Pb, the vaporization of Zn was low. The formation of stable compounds such as ZnO·Al 2O 3 could greatly decrease the metals volatilization. The presence of chlorine would enhance the volatilization of heavy metals by increasing the formation of metal chlorides. However, when the oxygen content was high, the chlorinating reaction was kinetically hindered, which heavy metals release would be delayed. 展开更多
关键词 municipal solid waste INCINERATION heavy metal emission fluidized bed
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Preparation of Super Composite Cement with a Lower Clinker Content and a Larger Amount of Industrial Wastes 被引量:7
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作者 何真 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2002年第4期78-81,共4页
The effects of the grinding mode,fineness,gypsum kinds and dosage,mix proportions on properties of the composite cements consisting of slag,fly ash,limestone and a lower content clinker were investigated,respectively.... The effects of the grinding mode,fineness,gypsum kinds and dosage,mix proportions on properties of the composite cements consisting of slag,fly ash,limestone and a lower content clinker were investigated,respectively.The results show that when the proportions among slag,fly ash and limestone are appropriate,the grinding technology and system are reasonable,the optimized gypsums and additives are effective,the 52.5R grade cement (52.5R grade cement means a higher strength than 52.5 at early age) can be prepared by clinker dosage of 50% in weight,the 42.5R or 42.5,32.5 grade composite cement containing 40% and 30% clinker also may be made, respectively.Moreover,the high performance concrete prepared from the above composite cements was studied experimentally. 展开更多
关键词 industrial wastes super composite cement high performance concrete PROPERTIES
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Impact of Electronic Wastes Recycling on Environmental Quality 被引量:10
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作者 JIAN-PING WANG XI-KUN GUO 《Biomedical and Environmental Sciences》 SCIE CAS CSCD 2006年第2期137-142,共6页
Objective To evaluate the environmental quality of Guiyu, Guangdong impacted by the electronic waste recycling industry. Methods The surface water, ground water and sediment samples taken separately from two sites tha... Objective To evaluate the environmental quality of Guiyu, Guangdong impacted by the electronic waste recycling industry. Methods The surface water, ground water and sediment samples taken separately from two sites that recycle E-wastes and other rubbish relevant to the E-waste recycling, and an agricultural area, were analyzed, and the data were used to evaluate the impact of E-waste recycling on the environmental quality of Guiyu based on environmental quality standards in China. Results The concentrations of lead and iron in the surface water samples significantly different in the three locations. The maximum value of lead in the first site was 8 times higher than the threshold of environmental quality standards for surface water. The concentration of iron in polluted sample was 22 times that of the background sample. Manganese and iron also showed a significant difference in ground water samples between the three sites. The amount of iron was 22 times that of the threshold of the quality standard for ground water, and 120 times that of the background sample. Moreover, the results of all the eight heavy metals showed significant differences among the sediment samples. The concentrations of copper, cadmium, nickel, and lead in the polluted samples were above the median benchmarks of National Oceanic and Atmospheric Administration (NOAA). The copper concentration of 2670 mg/kg was 10 times that of the median benchmark. Conclusion E-waste recycling has led to the severe pollution Guiyu. 展开更多
关键词 Electronic waste recycling Environmental quality impact evaluation
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Glass ceramic of high hardness and fracture toughness developed from iron-rich wastes 被引量:3
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作者 Weixin HAN Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China Manuscript received 27 October 2008 in revised form 17 November 2008 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2009年第3期181-190,共10页
A study has been carried out on the feasibility of using high iron content wastes, generated during steel making, as a raw material for the production of glass ceramic. The iron-rich wastes were mixed and melted in di... A study has been carried out on the feasibility of using high iron content wastes, generated during steel making, as a raw material for the production of glass ceramic. The iron-rich wastes were mixed and melted in different proportions with soda-lime glass cullet and sand. The devitrification of the parent glasses produced from the different mixtures was investigated using differential thermal analysis, X-ray diffraction, and scanning electron microscopy. The mechanical properties of the glass-ceramic were assessed by hardness and indentation fracture toughness measurement. A glass ceramic with mixture of 60 wt pct iron-rich wastes, 25 wt pct sand, and 15 wt pct glass cullet exhibited the best combination of properties, namely, hardness 7.9 CPa and fracture toughness 3.75 MPa·m^1/2, for the sake of containing magnetite in marked dendritic morphology. These new hard glass ceramics are candidate materials for wear resistant tiles and paving for heavy industrial floors. 展开更多
关键词 Iron-rich wastes Glass ceramics VITRIFICATION Hardness
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Enhancement of anaerobic biodegradability of flower stem wastes with vegetable wastes by co-hydrolysis 被引量:3
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作者 ZHANG Bo HE Pinjing Lü Fan SHAO Liming 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2008年第3期297-303,共7页
The vegetable wastes and flower stems were co-digested to evaluate the anaerobic hydrolysis performance of difficultly biodegradable organic wastes by introducing readily biodegradable organic wastes. The experiments ... The vegetable wastes and flower stems were co-digested to evaluate the anaerobic hydrolysis performance of difficultly biodegradable organic wastes by introducing readily biodegradable organic wastes. The experiments were carried out in batches. When the vegetable wastes were mixed with the flower stems at the dry weight ratio of 1 to 13, the overall hydrolysis rate increased by 8%, 12%, and 2% according to the carbon, nitrogen, and total solid (TS) conversion rate, respectively. While the dry weight ratio was designed as 1 to 3, there was a respective rise of 5%, 15%, and 4% in the conversion rate of carbon, nitrogen, and TS. The enhancement of anaerobic hydrolysis from the mixed vegetable wastes and flower stems can be attributed to the formation of volatile fatty acids (VFA) and nutrient supplement like nitrogen content. The maximum VFA concentration can achieve 1.7 g/L owing to the rapid acidification of vegetable wastes, loosing the structure of lignocellulose materials. The statistic bivariate analysis revealed that the hydrolysis performance was significantly related to the physical and biochemical compositions of the feeding substrate. Especially, the soluble carbon concentration in the liquid was significantly positively correlated to the concentration of nitrogen and hemicellulose, and negatively correlated to the concentration of carbon and lignocellulose in the feeding substrate, suggesting that the regulation and control of feedstock can have an important influence on the anaerobic hydrolysis of organic wastes. 展开更多
关键词 municipal solid wastes HYDROLYSIS feedstock characteristics VFA bivariate analysis
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The catalytic effect of the Na and Ca-rich industrial wastes on the thermal ignition of coal combustion 被引量:2
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作者 Jun Cheng Fan Zhou +3 位作者 Xiaoxu Xuan Jianzhong Liu Junhu Zhou Kefa Cen 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2019年第10期2467-2471,共5页
The catalytic effects of four industrial wastes,namely,the soap residue(SR),brine sludge(BS),calcium carbide residue(CCR),and white lime mud(WLM),on coal thermal ignition were investigated.The acidity of palmitate ani... The catalytic effects of four industrial wastes,namely,the soap residue(SR),brine sludge(BS),calcium carbide residue(CCR),and white lime mud(WLM),on coal thermal ignition were investigated.The acidity of palmitate anion associated with Na+in SR was lower than that of chloride anion combined with Na+in BS,which resulted in an improved the combustion of SR.The acidity of OH-anion combined with Ca2+in CCR was lower than that of CO32-anion combined with Ca2+in WLM,resulting in CCR exhibiting a better catalytic effect on coal ignition.The alkaline metal Na had lower initial ionisation energy than the alkaline earth metal Ca.Therefore,the Na-rich SR exhibited higher catalytic activity on coal ignition than Ca-rich CCR.The ignition temperature of coal with 0.5%SR decreased from 544 to 503°C. 展开更多
关键词 Industrial wastE CATALYSIS COAL COMBUSTION Thermal IGNITION
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