Geosystem Engineering最新文献

{"title":"Phase formation behavior of alkali-activated calcined clays: effects of the reactive phase and NaOH concentration","authors":"N. Rakhimova, V. Morozov, A. Eskin","doi":"10.1080/12269328.2021.1961615","DOIUrl":"https://doi.org/10.1080/12269328.2021.1961615","url":null,"abstract":"ABSTRACT The relevance of calcined clays as sources with a great potential for non-clinker alkali-activated materials has significantly increased in recent decades. This article reports on a study to investigate how NaOH with concentrations in the 5–14 M range affects the mechanical properties, amorphous-crystalline phase transformations, and reaction product composition of alkali-activated calcined kaolinite/montmorillonite cements with reactive phases of 60% and 33%, and with the SiO2/Al2O3 ratios of 1.54 and 1.74. The hardened pastes based on both calcined clays exhibited the highest compressive strength up to 9.1 MPa following their activation with 8 M NaOH. The higher amorphous fraction in the calcined clay provided gradual zeolitisation/crystallisation at Na2O/SiO2 and Na2O/Al2O3 molar ratios in the 0.36–0.63 and 0.56–0.98 ranges, respectively, accompanied by the deterioration of the mechanical characteristics of the samples. The zeolite content in the alkali-activated calcined clay cements with an amorphous fraction of 33% peaked for NaOH at 11 M, and the corresponding molar ratios of Na2O/SiO2 and Na2O/Al2O3 were 0.85 and 1.46, respectively. The main reaction products in the studied systems determined by XRD, TG/DSC, and FTIR spectroscopy analyses were N-A-S-H and zeolite A. The properties and reaction products obtained favor the use of proposed alkali-activated cements for controlled low-strength materials.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47085087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Neutralization of acidic soil using Myxococcus xanthus: Important parameters and their implications","authors":"Min-Ki Cho, S. Park, Eunyoung You, Chang-gyun Kim","doi":"10.1080/12269328.2021.1947901","DOIUrl":"https://doi.org/10.1080/12269328.2021.1947901","url":null,"abstract":"ABSTRACT Soil acidification through acid rain/deposition has been a serious problem that adversely affects the soil environment. In this study, Myxococcus xanthus, myxobacteria, was assessed towards neutralization of artificial acidic soil. Differences in initial pH and peat moss content in soil with incubated M. xanthus were being compared using a one-variable-at-a-time approach. It showed that the M. xanthus could neutralize the acidified soil using their specific metabolism, producing ammonium ions and hydroxide simultaneously. Increasing peat moss content could direct the neutralization performance of M. xanthus towards inhibition whereas reducing the peat moss content could improve the neutralization performance. Among experimental parameters such as initial pH, peat moss content in soil, and microorganism concentration, the interaction of soil amount either with peat moss content or microbial population density was meaningfully correlated to the neutralization of acidic soil.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2021.1947901","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44316899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of reservoir properties on the heat extraction performance in multi-well production EGS","authors":"Songze Liu, J. Wei, Hongliang Liu, Xuemei Liu, Bingxu Yan","doi":"10.1080/12269328.2021.1949756","DOIUrl":"https://doi.org/10.1080/12269328.2021.1949756","url":null,"abstract":"ABSTRACT A multi-well production enhanced geothermal system (EGS) with discrete fracture network is designed for heat extraction in this study. A thermal-hydraulic numerical simulation model is established, and the effect of reservoir properties on heat extraction is investigated. The results show that the growth rate of heat extraction efficiency will decrease as the mining time increases. The initial reservoir temperature has a positive correlation with average production temperature which provides a broad space for the use of extracted thermal energy. The variation of initial reservoir pressure has little effect on the heat extraction performance. A higher matrix permeability leads to a higher average production temperature and heat extraction ratio which prompts more working fluid flow into the matrix, the heat transfer process is enhanced. Under the conditions of this study, the preferred initial reservoir temperature is 493.15 K, the matrix permeability is 10−14m2.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43804740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Grinding characteristics of waste printed circuit boards in hammer mill using population balance model","authors":"Wonjae Lee, Seungsoo Park, Jai-koo Park","doi":"10.1080/12269328.2021.1942235","DOIUrl":"https://doi.org/10.1080/12269328.2021.1942235","url":null,"abstract":"ABSTRACT In this study, the grinding characteristics of waste printed circuit boards (PCBs) were evaluated using a population balance model (PBM). The grinding characteristics under various conditions (hammer rotational speeds of 1600, 2000, and 2400 rpm; screen aperture sizes of 0.71, 1.0, and 1.40 mm; and maximum feed sizes of 4, 6, and 8 mm) were identified. A PBM for a continuous hammer mill was used to quantitatively demonstrate the grinding characteristics. No significant difference was observed in the particle sizes of the products for various hammer rotational speeds. Nevertheless, the specific rate of breakage increased with the hammer rotational speed. As expected, a narrow screen aperture yielded a fine product. The mean residence time was increased in this case to comminute the particles to a finer size. Furthermore, a finer feed was predicted to yield a finer product; however, a coarser feed was observed to yield such a product instead. Each hammer milling condition should be controlled with respect to the hammer milling performance and target particle size of the product.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2021.1942235","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48746449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Trace elements geochemistry of the Golbanoo coal basin, Iran","authors":"K. Pazand","doi":"10.1080/12269328.2021.1914751","DOIUrl":"https://doi.org/10.1080/12269328.2021.1914751","url":null,"abstract":"ABSTRACT The Jurassic coal deposit in the Golbanoo area contains coal seams with thickness ranges from 5 cm to 1 m and is underlain and overlain by thin coaly shale, sandstone and siltstone beds. This study reports on the geochemical features of coals and non-coal rocks based on the 30 channel samples were collected and analyzed for trace elements using neutron activation analysis (INAA) and for major elements by X-ray fluorescence. The Al2O3, SiO2 and Fe2O3 concentrations are the main oxides. The amounts of trace elements (As, Ag, Br, Sb, Cr, Co, Sr, Zn, Ta, and ∑REE) in Golbanoo coal are high compared to world types of coal. The volcanic activity and their sulfide mineralization in study area is a favorable factor for accumulation of trace element in coal layers.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2021.1914751","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48030230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of blending and production processes considering origin mines and metallurgical units using linear programming rules","authors":"M. Farghaly, Mahrous A. M. Ali, Jong-Gwan Kim","doi":"10.1080/12269328.2021.1910574","DOIUrl":"https://doi.org/10.1080/12269328.2021.1910574","url":null,"abstract":"ABSTRACT This paper discusses a model that can optimize plant operation by considering transportation cost and metallurgical assays. All boundary conditions were set using ore samples taken from different locations in the same mine. Transportation from the mine to milling plants, dumping areas, and leaching units is also analyzed. Transportation from the mill to the smelter depends on assay results to ensure market readiness. We hypothesize that the grade of the material varies according to its source because milling plants are built to process different types of ore. Mines and processing units may be far apart, and therefore, it is critical to optimize production. Previous studies have discussed mine production optimization but did not consider metallurgical plants. The proposed model merges all units of a production system to determine the optimal planning solution. Linear programming uses network formulations of planning problems to consider a combination of mining and metallurgy operations. This technology is useful for analyzing the combination of two major systems, and hence, the dual theory was used in formulating the problem. The final model was applied to minimize the costs of production and distribution. The study checked the optimality of the solution for accuracy and its use as an indicator for long-term planning.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2021.1910574","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46196595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermodynamic and kinetic studies of heavy metal adsorption by modified nano-zeolite","authors":"Hossein Kamran Haghighi, M. Irannajad, A. Mohammadjafari","doi":"10.1080/12269328.2021.1873197","DOIUrl":"https://doi.org/10.1080/12269328.2021.1873197","url":null,"abstract":"ABSTRACT In this study, for the first time, nano-sized clinoptilolite zeolite produced by a dry planetary ball mill in the presence of sodium hexametaphosphate was employed to remove heavy metals. Results represented that the concentration of adsorbed ions on nano-zeolite increases with increasing pH, initial concentration of metals, and temperature. The maximum adsorption efficiency for Ni2+, Cd2+, and Cu2+ was found to be 74.20%, 97.60%, and 99.50% at a pH of 7.5 and 60°C, respectively. The adsorption of Ni2+, Cd2+ and Cu2+ on nano-zeolite increased from 44.40% to 74.20 %, 76.4% to 97.60%, and 94.30% to 99.50% by enhancing temperature from 20 to 60 °C. Furthermore, Gibbs’s free energy obtained from thermodynamic evaluations depicted that adsorptions had spontaneous behavior. According to Langmuir models, the maximum capacity (qm) of Ni2+, Cu2+, and Cd2+using nano-zeolite was found to be 17.79, 17.92, and 18.32 mg/g. Adsorption isotherms showed that results fitted better on the Langmuir model for Ni2+and Cu2+ and the Freundlich model for Cd+2 because the correlation coefficients (R2) were 0.99 for them. Finally, the pseudo-second-order kinetic model was selected to interpret the experimental data.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2021.1873197","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45239737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Testing the Implementation of a Pilot-Scale Kühni Column in Reactive and non-Reactive Condition","authors":"M. Asadollahzadeh, R. Torkaman, M. Torab‐Mostaedi","doi":"10.1080/12269328.2020.1860837","DOIUrl":"https://doi.org/10.1080/12269328.2020.1860837","url":null,"abstract":"ABSTRACT In this study, the primary efforts focused on using the Kühni extraction column with optimal energy and extraction efficiency for the removal of zinc ions from aqueous solution. The implementation of the extractive column was investigated in the reactive and non-reactive conditions. The experimental works illustrate that the extraction efficiency and hydrodynamic parameters, particularly depend on the energy input, phase flow rates as well as on the physical properties of the aqueous and organic phases. Among the operating parameters, the choice of the appropriate range for rotation speed plays a significant role for the removal of zinc ions in the pilot-scale Kühni column. The results showed that in the optimal condition for rotation speed, aqueous phase flow rate, and dispersed phase flow rate equal to 181 rpm, 33 L/h, and 21 L/h, respectively, the amount of zinc extraction reaches a maximum of 99.58%.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2020.1860837","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45177893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of natural gas flooding and its channelling prevention as enhanced oil recovery method","authors":"Dong Lifei, Wang Miao, Wang Wei, Lin Hun","doi":"10.1080/12269328.2021.1878938","DOIUrl":"https://doi.org/10.1080/12269328.2021.1878938","url":null,"abstract":"ABSTRACT The natural gas can improve the flooding effect as its excellent flow property and dissolution ability, but it is also easily to form the serious gas channelling when injecting gas continuously. In order to decribe the advantages and disadvantages of natural gas flooding, the oil dispalcement experiments of injecting natural gas after water flooding with different permeability cores are done. The natural gas channelling and its prevention manner are discussed by theoretical and experimental analysis, and the water alternating natural gas (WAG) injection is introduced. The results show that the natural gas flooding can enhance oil recovery after water flooding in different permeability reservoirs, especially in lower permeability reservoirs. The continuously natural gas flooding can easily form and develop the gas channeling. It takes only 0.13 PV to 0.45 PV natural gas injection to form the gas channelling, and spends 0.5 PV to 1.5 PV injection to develop the gas channelling for making the gas-liquid ratio reaching to 200 in the cores with the permeability from 6.876 × 10−3μm2 to 540.124 × 10−3μm2 . The WAG injection with the WAG cycle below 2 can prevent the natural gas channelling and keep the good natural gas utilisation in low/ultra-low permeability reservoirs.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2021.1878938","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41265608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Role of expanded clay aggregate, metakaolin and silica fume on the of modified lightweight concrete properties","authors":"T. A. Tawfik, Doha M. AlSaffar, B. Tayeh, K. Metwally, I. Elkattan","doi":"10.1080/12269328.2021.1887002","DOIUrl":"https://doi.org/10.1080/12269328.2021.1887002","url":null,"abstract":"ABSTRACT This investigation aimed to assess the effect of micro-cementitious materials on the mechanical properties and sulphate resistance of modified eco-efficient lightweight concrete (MDLWC). A modified lightweight concrete (MDLWC) was produced by mixing Light-expanded clay aggregate (LECA) with normal coarse aggregate (dolomite cushed rock). The impact of using different percentage of micro-cementitious materials which was micro silica fume (5–20%) and metakaolin(10–35%) on the mechanical properties (compressive strength, splitting tensile and flexural strength), waves transmission velocity of the ultrasonic pulses and sulphate resistivity of MDLWC was studied. The overall results illustrated that the use of micro-cementitious materials in MDLWC caused an enhancement on MDLWC properties. However, the MDLWC specimens containing micro silica fume showed better results than metakaolin. The best results were observed while using samples containing 10% micro silica fume and 30 % metakaolin individually or combined. In addition, the usage of combined mixture of 10% micro silica fume and 30% metakaolin MDLWC mix showed the best improvement rate in compressive, splitting tensile and flexural strengths by 25, 53.3 and 66.6%, respectively, compared to control MDLWC specimens. On the other hand, the direct empirical equations were proposed on the basis of strong and nonlinear regression analysis using the test data to predict the mechanical properties of MDLWC relationships, rationally. Experimental tests were conducted on ultrasonic pulses velocity, which showed good correlation equation strength of MDLWC. Scanning electron microscopy illustrated that the pores of concrete is smaller for SF and MK individually or combined with MDLWC compared to the control concrete, demonstrating an enhancement within the interfacial microstructure with the pozzolanas incorporation. The previous difference could be explained due to the concrete strength and sulphate penetrability to an extent.","PeriodicalId":12714,"journal":{"name":"Geosystem Engineering","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2021-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12269328.2021.1887002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49115978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}