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Liu, Xiao
- Decomposition of Ammonia Nitrogen from Biologically Pretreated Coking Wastewater with Electrochemical Three-Dimensional Ti/RuO2/IrO2 Electrodes
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Authors
Affiliations
1 College of Civil and Architecture Engineering, North China University of Science and Technology, Tangshan, 063009, CN
2 Tangshan City Drainage Co., Ltd., Tangshan, 063001, CN
1 College of Civil and Architecture Engineering, North China University of Science and Technology, Tangshan, 063009, CN
2 Tangshan City Drainage Co., Ltd., Tangshan, 063001, CN
Source
Nature Environment and Pollution Technology, Vol 15, No 3 (2016), Pagination: 881-886Abstract
In this research, the electrochemical oxidation with a three-dimensional electrode system, with coke serving as packed bed particle electrodes, was applied for the removal of ammonia nitrogen in biologically pretreated coking wastewater. Surface characteristics of the anode plate and the coke were analysed. The results showed that there had been few cracks on the coating surface of anode and the coating layer had been compact before electrolysis, while the coating surface became relatively rough after electrolysis and small cracks appeared on anode surface. Meanwhile, the surface of prepared coke was porous at the beginning, which enabled it to have adsorption effect, while after electrolysis, the surface of the used coke became dense, which made it function better as packed bed electrodes. In addition, operating variables of retention time, plate spacing, area/volume, current density, pH and chloride concentration were investigated respectively to check their influence on ammonia nitrogen removal. Meanwhile, the results showed that the electrochemical three-dimensional Ti/RuO2/IrO2 electrodes could remove ammonia nitrogen efficiently, and when plate distance was 1.0cm, retention time was 40min and current density was 4.5mA/cm2, the highest ammonia nitrogen removal rate of about 95% was achieved, which was much higher than the removal rate of the system when Ti/RuO2/IrO2 electrodes were used in single under the same condition.Keywords
Coking Wastewater, Ti/RuO2/IrO2 Electrodes, Ammonia Nitrogen, Electrochemical Oxidation.Full Text
References
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- Performance of Slag Ceramics for the Treatment of Micro-Aerobic Effluent in Contact Oxidation Reactor
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Authors
Affiliations
1 College of Civil and Architectural Engineering, North China University of Science and Technology, Tangshan, 063009, P. R., CN
1 College of Civil and Architectural Engineering, North China University of Science and Technology, Tangshan, 063009, P. R., CN
Source
Nature Environment and Pollution Technology, Vol 16, No 1 (2017), Pagination: 175-180Abstract
Slag ceramics, which were made from steel slag as well as a small percentage of clay and pore forming materials, were applied to a biological contact oxidation reactor for the treatment of microaerobic effluent. The experiment results showed that slag ceramics exhibited some favourable characteristics for removing pollution, such as lighter mass, larger specific surface area and easier biofilm-attachment compared with steel slag. In addition, a contact oxidation process filled with slag ceramics was multifunctional in pollutant removal, namely, COD, nitrogen and phosphorus were simultaneously removed. Under the hydraulic retention time (HRT) of 2.5 h, the removal efficiencies of NH3-N, TN, COD and TP were 99%, 84%, 63% and 82%, respectively, and the effluent concentrations ranged in 12˜27 mg/L, 0.1˜1.0 mg/L, 0~0.6 mg/L and 1.0˜6.8 mg/L, respectively. Mineralogical and chemical investigations revealed that the mechanisms for P removal by slag-ceramics filler, were the combination of adsorption and Ca phosphate precipitation. Therefore, the mechanisms of pollutant removal through the contact oxidation reactor filled with slag ceramics were complicated, including adsorption, precipitation, bio-oxidation and bio-reduction, etc. Meanwhile, phosphate saturation should be considered for the long-term operation.Keywords
Steel Slag Ceramics, Boifilm, Contact Oxidation, Nitrogen, Phosphorus.Full Text
References
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- Experimental Analysis of the Ratio of Similar Materials by Similarity Model Test on Raw Coal
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Authors
Affiliations
1 School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454003, CN
2 Applied Technical College, China University of Mining and Technology, Xuzhou, Jiangsu 221008, CN
3 State Key Laboratory for Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, CN
1 School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454003, CN
2 Applied Technical College, China University of Mining and Technology, Xuzhou, Jiangsu 221008, CN
3 State Key Laboratory for Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, CN
Source
Current Science, Vol 113, No 11 (2017), Pagination: 2174-2179Abstract
Similarity model test is an effective approach to study the mechanism of hydraulic fracture propagation in coalbed methane reservoirs as well as theoretical analysis and numerical simulation. The efficiency of the similarity model test result is closely related to the selection and ratio of similar materials. Similar material ratio test was conducted to simulate the mechanical parameters of raw coal using orthogonal method and an appropriate similarity model for hydraulic fracturing experiment was developed in this study. Results show that it is suitable to select cement, gypsum as binder and apply pulverized coal as aggregate through the analysis of experimental data. The mechanical parameters of similar materials, including uniaxial compressive strength, elastic modulus, Poisson ratio and firmness coefficient are tested using laboratory tests. The impact of diverse ratios of similar materials on the mechanical parameters is analysed. A proper ratio is selected to make the mechanical parameters of raw coal close to the ones of similar material, in order to meet the demand of the similarity model test based on raw coal. The results can provide theoretical basis and technical support for the selection of similar materials to carry out hydraulic fracturing experiments.Keywords
Experimental Investigation, Hydraulic Fracturing, Raw Coal, Similar Materials, Mechanical Parameters.Full Text
References
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- Characteristics of Hydraulic Fracture Surface Based on 3d Scanning Technology
Abstract Views :85 |
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Authors
Affiliations
1 School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454 003., CN
2 State Key Laboratory for Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400 044, CN
3 Applied Technical College, China University of Mining and Technology, Xuzhou, Jiangsu 221 008,, CN
1 School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454 003., CN
2 State Key Laboratory for Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400 044, CN
3 Applied Technical College, China University of Mining and Technology, Xuzhou, Jiangsu 221 008,, CN
Source
Journal of Mines, Metals and Fuels, Vol 66, No 4 (2018), Pagination: 227-230Abstract
The surface characteristics of fractured specimens are important in hydraulic fracturing laboratory experiments. In this paper we present a three-dimensional (3D) scanning device assembled to study these surface characteristics. Cube-shaped coal rock specimens were produced in the laboratory and subjected to triaxial loading until the specimen split in two in a hydraulic fracturing experiment. Each fractured specimen was placed on a rotating platform and scanned to produce 3D surface coordinates of the surface of the fractured coal specimen. The scanned data was processed to produce high-precision digital images of the fractured model, a surface contour map, and accurate values of the surface area and specimen volume. The images produced by processing the 3D scanner data provided detailed information on the morphology of the fractured surface and the mechanism of fracture propagation. High-precision 3D mapping of the fractured surfaces is essential for quantitative analysis of fractured specimens. The 3D scanning technology presented here is an important tool for the study of fracture characteristics in hydraulic fracturing experiments.Keywords
Surface characteristic; hydraulic fracturing; 3D scanning; 3D coordinates; surface area.
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