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Meng Zhou - One of the best experts on this subject based on the ideXlab platform.
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additional application of Aluminum Sulfate with different fertilizers ameliorates saline sodic soil of songnen plain in northeast china
Journal of Soils and Sediments, 2019Co-Authors: Meng Zhou, Xiaobing Liu, Qingfeng Meng, Xiannan Zeng, Jizhou Zhang, Jie WangAbstract:Serious soil salinization, including excessive exchangeable sodium and high pH, significantly decreases land productivity. Reducing salinity and preventing alkalization in saline-sodic soils by comprehensive improvement practices are urgently required. The combinations of Aluminum Sulfate with different types of fertilizer at different rates were applied on rice paddy with saline-sodic soils of the Songnen Plain in Northeast China to improve soil quality and its future utilization. Experiments were carried out in a completely randomized block design. Twelve treatments with Aluminum Sulfate at the rates of 0, 250, 500, and 750 kg hm−2 with inorganic, bio-organic, and organic-inorganic compound fertilizers were performed. Soil pH, electronic conductivity (EC), cation exchangeable capacity (CEC), exchangeable sodium percentage (ESP), total alkalinity, sodium adsorption ratio (SAR), soil organic carbon (SOC), available nutrients, soluble ions, rice growth, and yield in the saline-sodic soils were measured across all treatments. The relationships among the measured soil attributes were determined using one-way analysis of variance, correlation analysis, and systematic cluster analysis. The pH, EC, ESP, total alkalinity, SAR, Na+, CO32−, and HCO3− in saline-sodic soil were significantly decreased, while CEC, SOC, available nitrogen (AN), available phosphorus (AP), available potassium (AK), K+, and SO42− were significantly increased due to the combined application of Aluminum Sulfate with fertilizer compared with the fertilizer alone. The most effective treatment in reducing salinity and preventing alkalization was Aluminum Sulfate at a rate of 500 kg hm−2 with organic-inorganic compound fertilizer. This treatment significantly decreased the soil pH, EC, ESP, total alkalinity, SAR, Na+, and HCO3− by 5.3%, 28.9%, 41.1%, 39.3%, 22.4%, 23.5%, and 35.9%, but increased CEC, SOC, AN, AP, AK, K+, SO42−, rice height, seed setting rate, 1000-grain weight, and yield by 77.5%, 115.5%, 106.3%, 47.1%, 43.3%, 200%, 40%, 6.2%, 43.9%, 20.3%, and 42.2%, respectively, compared with CK treatment in the leaching layer. The combined application by Aluminum Sulfate at a rate of 500 kg hm−2 with organic-inorganic compound fertilizer is an effective amendment of saline-sodic soils in Songnen Plain, Northeast China. These results are likely related to the leaching of Na+ from the soil leaching layer to the salt accumulation layer and desalination in the surface soil, and the increase of SOC improved the colloidal properties and increased fertilizer retention in soil. In addition, the environmental impact of Aluminum Sulfate applied to soil needs to be further studied.
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additional application of Aluminum Sulfate with different fertilizers ameliorates saline sodic soil of songnen plain in northeast china
Journal of Soils and Sediments, 2019Co-Authors: Meng Zhou, Xiaobing Liu, Qingfeng Meng, Xiannan Zeng, Jizhou Zhang, Jie WangAbstract:Purpose Serious soil salinization, including excessive exchangeable sodium and high pH, significantly decreases land productivity. Reducing salinity and preventing alkalization in saline-sodic soils by comprehensive improvement practices are urgently required. The combinations of Aluminum Sulfate with different types of fertilizer at different rates were applied on rice paddy with saline-sodic soils of the Songnen Plain in Northeast China to improve soil quality and its future utilization.
Yuli Wang - One of the best experts on this subject based on the ideXlab platform.
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effects of Aluminum Sulfate and quicklime fluorgypsum ratio on the properties of calcium sulfoaluminate csa cement based double liquid grouting materials
Materials, 2019Co-Authors: Yuli Wang, Junjie Wang, Xuemao GuanAbstract:Grouting materials are used frequently in grouting reinforcement projects, such as mining and coastal engineering. Double liquid grouting materials are mostly used because of the fast setting and high early strength properties when the two slurries are mixed together but high fluidity when the two slurries are separated. In our study, double liquid grouting materials were developed from CSA cement (slurry A), quicklime and fluorgypsum (slurry B). Aluminum Sulfate was added in slurry B in order to counteract any adverse effects caused by the fluorgypsum, such as the decreased early compressive strength and the prolonged setting time. The effects of Aluminum Sulfate content and the quicklime/fluorgypsum ratio on the setting time, hydration heat, and compressive strength of the double liquid grouting materials were investigated, and the hydration products were characterized through thermogravimetry-differential thermal analysis (TG-DTA), X-ray Diffraction (XRD), and Scanning Electron Microscope (SEM) tests. The results show that the addition of Aluminum Sulfate can shorten the setting time and increase compressive strength at both early and later ages. Considering the setting time and compressive strength of double liquid grouting material at the same time, the optimum content of Aluminum Sulfate was found to be 2%, and the optimum ratio of quicklime/fluorgypsum was found to be 2:8. The values of the optimum content of Aluminum Sulfate and ratio of quicklime/fluorgypsum were verified from theoretical analysis.
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Effects of Aluminum Sulfate and Quicklime/Fluorgypsum Ratio on the Properties of Calcium Sulfoaluminate (CSA) Cement-Based Double Liquid Grouting Materials
MDPI AG, 2019Co-Authors: Yuli Wang, Junjie Wang, Xuemao GuaAbstract:Grouting materials are used frequently in grouting reinforcement projects, such as mining and coastal engineering. Double liquid grouting materials are mostly used because of the fast setting and high early strength properties when the two slurries are mixed together but high fluidity when the two slurries are separated. In our study, double liquid grouting materials were developed from CSA cement (slurry A), quicklime and fluorgypsum (slurry B). Aluminum Sulfate was added in slurry B in order to counteract any adverse effects caused by the fluorgypsum, such as the decreased early compressive strength and the prolonged setting time. The effects of Aluminum Sulfate content and the quicklime/fluorgypsum ratio on the setting time, hydration heat, and compressive strength of the double liquid grouting materials were investigated, and the hydration products were characterized through thermogravimetry-differential thermal analysis (TG-DTA), X-ray Diffraction (XRD), and Scanning Electron Microscope (SEM) tests. The results show that the addition of Aluminum Sulfate can shorten the setting time and increase compressive strength at both early and later ages. Considering the setting time and compressive strength of double liquid grouting material at the same time, the optimum content of Aluminum Sulfate was found to be 2%, and the optimum ratio of quicklime/fluorgypsum was found to be 2:8. The values of the optimum content of Aluminum Sulfate and ratio of quicklime/fluorgypsum were verified from theoretical analysis
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effect of slaked lime and Aluminum Sulfate on the properties of dry mixed masonry mortar
Construction and Building Materials, 2018Co-Authors: Yuli WangAbstract:Abstract There are some drawbacks, such as bleeding, poor cohesiveness, etc, because the water to cement (W/C) ratio of dry-mixed masonry mortar is greater. Therefore, the influences of the slaked lime and Aluminum Sulfate on performances of masonry mortar were studied. The results show that the optimum ratio of slaked lime to Aluminum Sulfate by weight is 5–1, and the consistency, bleeding and strength of the mortar can be better improved by the two compounds. The consistency increases by 12.3%, the bleeding water decreases by 6.1% and 28d compressive strength of mortar increases by 27.3% when the content of compound admixture is 6 wt%. The results of SEM, XRD and TG-DTA show that the amount of AFt and C-S-H is changed by the slaked lime and Aluminum Sulfate, the hydration products and hardened structures are optimized by the compound admixture, and the performances of mortar are improved. This is a good reference value for the performance improvement of masonry mortar.
Xianhe Deng - One of the best experts on this subject based on the ideXlab platform.
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efficient inhibition of s iv oxidation in a novel basic Aluminum Sulfate regenerative flue gas desulfurization process by ethylene glycol kinetics and reaction mechanism
Energy & Fuels, 2019Co-Authors: Min Chen, Feiqiang He, Xianhe DengAbstract:For the regenerative flue gas desulfurization method based on basic Aluminum Sulfate (BAS), efficiently inhibiting the oxidation of desulfurization by-products is extremely critical to reuse the absorbents and recover SO2. In this paper, the macrokinetics of S(IV) antioxidation procedure was systematically investigated by varying inhibitors, Aluminum content, pH, S(IV) concentration, ethylene glycol (EG) concentration, temperature, oxygen partial pressure, and air flow in a bubbling reactor with magnetic stirring. EG was environmentally considered to be an ideal inhibitor by screening. Furthermore, the S(IV) oxidization speed inhibited by EG was significantly accelerated when the Aluminum content rose and was correlated to 10–0.6pH with a coefficient of 0.98. The general oxidization speed of S(IV) was determined to be 1.1, −2.4, and 0.96 order in oxygen partial pressure, EG content, and total S(IV) level, respectively. The apparent activity energy of S(IV) oxidation process was obtained to be 52.0 kJ/mol....
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study on the kinetics of s iv oxidation in the basic Aluminum Sulfate wet flue gas desulfurization process
RSC Advances, 2017Co-Authors: Min Chen, Xianhe DengAbstract:Through a laboratory-scale bubbling apparatus, the kinetics of S(IV) oxidation related to the basic Aluminum Sulfate (BAS) wet flue gas desulfurization (FGD) process were investigated by varying the components of the BAS solution, concentration of S(IV), temperature, air flow and oxygen partial pressure. The experimental findings showed that the oxidation rate of S(IV) slightly increased with pH as the basicity increased, while increasing the amount of Aluminum could weaken the oxidation rate of sulfite. Moreover, the general reaction rate was found to be 0.21 order in S(IV) and first-order in oxygen, respectively. The apparent activation energy was calculated to be 24.5 kJ mol−1. Combined with the kinetic model of S(IV) oxidation proposed, we found that the general oxidation rate of S(IV) in BAS rich solution was controlled by the mass transfer of oxygen accompanied with a rapid chemical reaction, which was verified by the Hatta number (around 1.4). As a result, the intrinsic kinetics were investigated, indicating the reaction orders with respect to S(IV) and oxygen to be 0.42 and 1.0, respectively. The results would be valuable for process optimization or industrial design during the BAS wet FGD process.
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study on the regeneration of basic Aluminum Sulfate so2 rich solution by vacuum desorption
Energy & Fuels, 2016Co-Authors: Min Chen, Xianhe DengAbstract:Basic Aluminum Sulfate (BAS) wet flue gas desulfurization (FGD) is a promising renewable process used to remove sulfur dioxide (SO2) from flue gas, in which the regeneration of BAS SO2-loaded solution is of great importance for the reuse of BAS solution. In this paper, a novel regeneration method by vacuum desorption was developed to achieve superior regeneration performance for a BAS-rich solution. The operating parameter effect on SO2 desorption performance was thoroughly investigated in a lab-scale reactor. The experimental results demonstrated that the great decrease of pressure could significantly improve the regeneration performance, and high desorption temperature was favorable for SO2 desorption. Furthermore, it is worth determining the optimum components of a BAS-rich solution and initial sulfite concentration, considering the contradiction between the SO2 absorption performance and the regeneration performance. The increase of stirring speed in the liquid had a considerable positive effect on SO...
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removal of so2 from flue gas using basic Aluminum Sulfate solution with the byproduct oxidation inhibition by ethylene glycol
Energy & Fuels, 2016Co-Authors: Min Chen, Xianhe DengAbstract:This paper presents a novel wet flue gas desulfurization (FGD) technology based on a basic Aluminum Sulfate (BAS) desorption regeneration process, in which ethylene glycol (EG) was first employed to inhibit the byproduct oxidation. The operating parameter effect on SO2 absorption efficiency and oxidation efficiency of sulfite was thoroughly examined in a lab-scale bubbling column. The results indicated that both the amount of Aluminum and basicity play important roles on the desulfurization time with above 90% absorption efficiency. The BAS-based desulfurization process was more suitable for a low temperature and low gas flow rate. High inlet SO2 concentrations may contribute to the mass-transfer rate of SO2, and the SO2 absorption efficiency remained above 90% when the pH value was over 3.10. With the addition of 1% (v/v) EG in BAS solution, the oxidation efficiency dropped dramatically from 86 to below 10% (in 120 min). On the basis of the two-film theory, a model of the SO2 absorption process was devel...
Jie Wang - One of the best experts on this subject based on the ideXlab platform.
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additional application of Aluminum Sulfate with different fertilizers ameliorates saline sodic soil of songnen plain in northeast china
Journal of Soils and Sediments, 2019Co-Authors: Meng Zhou, Xiaobing Liu, Qingfeng Meng, Xiannan Zeng, Jizhou Zhang, Jie WangAbstract:Serious soil salinization, including excessive exchangeable sodium and high pH, significantly decreases land productivity. Reducing salinity and preventing alkalization in saline-sodic soils by comprehensive improvement practices are urgently required. The combinations of Aluminum Sulfate with different types of fertilizer at different rates were applied on rice paddy with saline-sodic soils of the Songnen Plain in Northeast China to improve soil quality and its future utilization. Experiments were carried out in a completely randomized block design. Twelve treatments with Aluminum Sulfate at the rates of 0, 250, 500, and 750 kg hm−2 with inorganic, bio-organic, and organic-inorganic compound fertilizers were performed. Soil pH, electronic conductivity (EC), cation exchangeable capacity (CEC), exchangeable sodium percentage (ESP), total alkalinity, sodium adsorption ratio (SAR), soil organic carbon (SOC), available nutrients, soluble ions, rice growth, and yield in the saline-sodic soils were measured across all treatments. The relationships among the measured soil attributes were determined using one-way analysis of variance, correlation analysis, and systematic cluster analysis. The pH, EC, ESP, total alkalinity, SAR, Na+, CO32−, and HCO3− in saline-sodic soil were significantly decreased, while CEC, SOC, available nitrogen (AN), available phosphorus (AP), available potassium (AK), K+, and SO42− were significantly increased due to the combined application of Aluminum Sulfate with fertilizer compared with the fertilizer alone. The most effective treatment in reducing salinity and preventing alkalization was Aluminum Sulfate at a rate of 500 kg hm−2 with organic-inorganic compound fertilizer. This treatment significantly decreased the soil pH, EC, ESP, total alkalinity, SAR, Na+, and HCO3− by 5.3%, 28.9%, 41.1%, 39.3%, 22.4%, 23.5%, and 35.9%, but increased CEC, SOC, AN, AP, AK, K+, SO42−, rice height, seed setting rate, 1000-grain weight, and yield by 77.5%, 115.5%, 106.3%, 47.1%, 43.3%, 200%, 40%, 6.2%, 43.9%, 20.3%, and 42.2%, respectively, compared with CK treatment in the leaching layer. The combined application by Aluminum Sulfate at a rate of 500 kg hm−2 with organic-inorganic compound fertilizer is an effective amendment of saline-sodic soils in Songnen Plain, Northeast China. These results are likely related to the leaching of Na+ from the soil leaching layer to the salt accumulation layer and desalination in the surface soil, and the increase of SOC improved the colloidal properties and increased fertilizer retention in soil. In addition, the environmental impact of Aluminum Sulfate applied to soil needs to be further studied.
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additional application of Aluminum Sulfate with different fertilizers ameliorates saline sodic soil of songnen plain in northeast china
Journal of Soils and Sediments, 2019Co-Authors: Meng Zhou, Xiaobing Liu, Qingfeng Meng, Xiannan Zeng, Jizhou Zhang, Jie WangAbstract:Purpose Serious soil salinization, including excessive exchangeable sodium and high pH, significantly decreases land productivity. Reducing salinity and preventing alkalization in saline-sodic soils by comprehensive improvement practices are urgently required. The combinations of Aluminum Sulfate with different types of fertilizer at different rates were applied on rice paddy with saline-sodic soils of the Songnen Plain in Northeast China to improve soil quality and its future utilization.
Yingcan Zhao - One of the best experts on this subject based on the ideXlab platform.
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effect of dosing sequence and solution ph on floc properties of the compound bioflocculant Aluminum Sulfate dual coagulant in kaolin humic acid solution treatment
Bioresource Technology, 2012Co-Authors: Baoyu Gao, Qinyan Yue, Yan Wang, Nana Peng, Yingcan ZhaoAbstract:Abstract The compound bioflocculant (CBF)–Aluminum Sulfate (AS) dual-coagulant and AS were comparatively studied for the coagulation of kaolin–humic acid solution. Floc properties including floc growth rate, size, strength, recoverability and fractal dimension under different pH conditions were investigated by Mastersizer 2000. Results indicated that, the flocs formed by AS–CBF (AS dosed first) showed the largest size and the best recoverability across the pH range investigated. While flocs formed by CBF–AS gave the most compact structure. The three coagulants exhibited similar floc growth rate and strength. Moreover, flocs formed in acidic conditions were stronger and more recoverable but showed lower growth rate, smaller size and looser structure compared to those formed at pH > 6 regardless of the coagulant used. Charge neutralization was the dominant mechanism for AS at low pH, while the coagulation mechanism transformed to enmeshment as the pH increased. There was an additional adsorption bridging effect for AS–CBF and CBF–AS.
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coagulation performance and floc properties of compound bioflocculant Aluminum Sulfate dual coagulant in treating kaolin humic acid solution
Chemical Engineering Journal, 2011Co-Authors: Nana Peng, Yingcan ZhaoAbstract:Abstract The coagulation performance and floc properties of compound bioflocculant (CBF)-Aluminum Sulfate (AS) dual-coagulant were compared with that of AS in the treatment of synthetic kaolin-humic (HA) water. Results showed that AS-CBF dual coagulant was more efficient for HA removal. The floc formation, breakage and reformation were investigated under different dosages and shear rates. Increasing coagulant dosage resulted in the increase of floc growth rate and size. But the floc recoverability was found to decrease with increasing coagulant dosage. Furthermore, flocs formed by AS-CBF (AS dosed firstly) had faster growth rate, larger size and better recoverability than AS and CBF-AS (CBF dosed firstly) in the dosage range investigated. Similar results were obtained when the shear force was changed. Precipitate charge neutralization was a dominant mechanism of AS, and CBF had good adsorption bridging effect. Due to the combination of two advantages, coagulation efficiency could be enhanced significantly.