Papers by Author: Ting Lin Huang

Abstract: The Management Information System (MIS) on pipe bursts was developed by Visual Basic 6.0 to handle the accident data in water distribution networks. The thought of modular design is adopted in system design and the whole system is divided into four modules, including user login, database connection, database operation and data enquiry & analysis. The MIS has the functions of data input, output, storage, enquiry, statistics and analysis, which are implemented by component technology, ADO and SQL. Based on the functions it can achieve day-to-day management of network accidents and supply guidance of treatment measures. So the MIS on pipe bursts is a useful tool in network management.

Abstract: Based on the improved weighted-least-square model and fuzzy similarity ratio method, a methodology is proposed to detect pipe bursts in real-time. When SCADA data is obtained DFP algorithm is used to get the real network state. Then the real values of burst characteristics are computed. And the hypothetical values assuming each pipe as the accident pipe are calculated for comparison. The fuzzy similarity ratio method is used to judge whether there is a pipe burst. If there is, the hypothetical value that is most similar to the real value is the accidental state and the corresponding assumed break is the burst location. According to the methodology a software system is developed with Delphi 7 for verification. The running results of a designed network show that the methodology is reliable and its detection accuracy is over 45%.

Abstract: In most field studies, enhancing biodegradation of petroleum hydrocarbons depends on the specific microbial population present. It is a dispute whether inoculation microbial consortium improved the degradation of petroleum because indigenous microorganism can easily adapt to surroundings and contend for inoculation microbial consortium. Therefore, all of three technologies (natural attenuation, biostimulation and bioaugmentation) were evaluated. After 8 weeks of bioremediation, it was observed that bioaugmentation most effectively removed 53% of oil under inoculation condition. Poor oil removal of below 4% was observed under natural attenuation without inoculation. In addition, it was found that the degradation of oil in oil-polluted soil followed second-order model and acquired the dynamics equations. The half-life of natural attenuation, biostimulation and bioaugmentation was 833 days, 75days, 25days, respectively. The results indicated bioaugmentation could improve efficiently the degradation of TPH and shorten the bioremediation period.

Abstract: Electrokinetic remediation is an effective technology to enhance bioremediation of oil-contaminated soil as the transport process of non-polar organic contaminants in soil was promoted under low-power direct current electric fields. In this study three treatments including the application of electric field treatment alone, inoculation treatment alone, and combination of the application of electric field and inoculation treatment were carried out. The results indicated that highest removal efficiency was 83% in couple of the application of electric field and inoculation treatment. TPH concentration decreased from 6000 mg.kg^-1 to 2000 mg.kg^-1 when a 30 voltage direct current electric field was applied to oil-contaminated soil for 10 min after 4 days. It was observed that dehydrogenase activity had no increase after application direct current electric field. However, the TPH degradation efficiency was 52% higher than the control treatment. GC analysis showed that n-alkanes (C₁₄-C₃₁) were preferentially degraded, and soil remaindered more low quality compounds after the application of electric field treatment applied 52 days. These results indicated that the application of electric field improved degradation of inoculated bacteria through promoting the transport of nutrients, such as nitrogen and phosphorous and electron acceptors.

Abstract: The minimum energy required for destratification of a source water reservoir is important to determine the design capacity of mixing system used to improve the source water quality. Taking Jinpen Reservoir in Xi’an, as a study case, the water volumes under different water levels of the reservoir were numerically calculated using the geometry data obtained with a RTK system. The total potential energy (PE) was determined by integrating the PE in each thin sub-layer over the water depth with density dependent on the water temperature. The average water temperature after complete mixing was calculated based on the heat exchange theory, and was consistent with the numerical result of temperature simulation. The difference of total potential energy before and after mixing was calculated for each month with the data of water temperature, water density and water volume. The minimum energy required for destratification increasing with the temperature gradient, was relatively high during the period from June to October, and reached a peak of 2412.92 kW·h in July.

Abstract: Water-lifting aeration technology is one of the effective in-situ algae control technologies in deep reservoirs. Effects of water-lifting aerator type on the in-situ algae inhibition using water-lifting aeration technology was numerically analyzed with the help of FLUENT software. Under stable state, one large clockwise circulation flow was generated outside non-submerged and submerged water-lifting aerators, but the core algae inhibition zone was farther away from the non-submerged aerator under each water depth. When the water depth was increased from 77.25 m to 97.25 m, the percentage of the core algae inhibition zone to the whole flow domain was decreased from 56.01% to 47.34% for the submerged water-lifting aerator case, while that was decreased from 55.48% to 40.15% for the non-submerged water-lifting aerator case.

Abstract: Flow outside the water-lifting aerator was simulated with FLUENT software, and the effects of water depth on the in-situ algal growth control using water-lifting aeration technology was numerically analyzed. Under stable state of flow outside the water-lifting aerator, the clockwise flow near the inlet and counter-clockwise flow in other domains coexisted, flow velocity decreased as the distance from the water-lifting aerator increased. When the water depth was increased from 50 m to 110 m, the radius of the core algal growth control zone increased from 60 m to 175 m, and the ratio of the algal growth control zone to the whole flow domain increased from 12.5% to 30.6%. The proper design intervals of water-lifting aerators in reservoirs were proposed as 1.2-1.6 times of water depth.

Abstract: A quasi two-dimensional model was developed to calculate depth-averaged velocity and bed shear stress in a straight compound channel with one-line emergent vegetated at the floodplain edge. Reduction in volume of water due to vegetation is modelled as porosity. Drag force due to vegetation is modelled as an additional momentum source term in the Navier-Stokes equation. Estimation methods for model parameters—friction factor, roughness height due to drag force, porosity, eddy viscosity and advection term-are discussed. The predictive capability of the model is assessed against experimental data with regard to distributions of depth-averaged velocity and boundary shear stress. The results show that the quasi 2D model well reproduces a reasonable simulation of the flow field under relative water depths of 0.24 and 0.52.

Abstract: A one-dimensional hydrodynamic model for the aeration chamber in the water-lifting aerator was developed on the basis of the total force balance between the driving force and flow resistance acting on the gas-liquid two-phase flow. Water velocity in the aeration chamber was predicted under different combinations of flow resistance coefficients at the top (KT) and the entrance and exit (KE), the results of sensitivity analysis showed that both KT and KE have significant effect on the predicted water velocity and gas holdup in the riser of the aeration chamber. Taking the water velocity as the main objective, flow resistance coefficients of KT and KE were optimized as and , where Ulr is the superficial water velocity. Using optimized model parameters, the water velocities were well predicted within ±7% of the measured ones respectively.

Abstract: The research takes Yang Liuqing water plant as an example.Compare the studies of the conventional process, coagulation pressure type membrane process, coagulation submerged membrane process between removal efficiency and water production rate.The result shows the removal efficiency of raw water turbidity and oxygen consumption had an increase of 7% and 4% than the conventional process. Disposable water production rate increased by 1%-2%.Meanwhile combined with other influence factors,a analytic hierarchy model has been established. From the two aspects of cost and benefit,compare comprehensively different process.The result shows that coagulation - immersed membrane process is more suitable drinking water treatment technology for water purification operation in water purification plant.