Papers by Keyword: Removal Efficiency

Abstract: Abrasive water jet surface cleaning technology offers advantages such as low energy consumption, high cleaning rate, and cost-effectiveness. It can effectively meet the surface cleaning requirements of complex curved metal parts and composite materials, presenting promising applications in the fields of remanufacturing and precision machining. This study specifically focuses on the design of an abrasive water jet surface coating removal device for metal structural components. To address the issue of abrasive jet wear on sealing structures, a rotating pipeline approach is employed. This innovative device allows for adjustments in the jet incidence angle and rotation radius. A simulation model is developed to predict removal rates by MATLAB/Simulink. And an experimental system is established to validate the functionality of the removal actuator, demonstrating a maximum removal rate of 34.2mm²/s at jet pressure of 5 MPa. This research contributes to enhancing the efficiency of removing surface coatings from structural components and provides valuable theoretical guidance for the planning of coating removal paths for actuators.

Abstract: The exceptional properties of chitosan and its effective technique of adsorbing contaminants even to near-zero concentrations are the primary reasons for special attention. The adsorption studies analyzed various elements, including pH, concentration, contact time, and adsorbent dose. The study used these factors as input data, with the output data concentrating on MB removal efficiency. For prediction and optimization, MB adsorption used response surface methodology/central composite design (RSM-CCD), artificial neural network (ANN), and adaptive neuron-fuzzy inference system (ANFIS) models. For developing the ANN and ANFIS models, 70% of the data was allocated for training, and 15% was dedicated to validation and testing. Based on the RSM-CCD findings, the optimization outcome for the process parameters was obtained at pH 7, contact time 55 minutes, 6.0 grams of adsorbent, and MB concentration of 125 mg/L. However, an ideally trained neural network is described using training, testing, and validation phases, and the R² values at these phases were found to be 0.99987, 1, and 1, respectively. The statistical findings showed that the ANFIS approach outperforms the RSM and ANN model approaches.

Abstract: Wet packed scrubber system is one of the considering air pollution control technology. Its high removal efficiency has been recognized by many studies. However, different type of biomass sources and different type of wet scrubber may produce different desirable result. Considering on the emission of biomass burning type in Cambodia, this study aims to investigate the performance removal efficiency of particulate matter from biomass burning using wet packed scrubber system. The laboratory scale of wet packed scrubber system was designed to meet the current requirement of Cambodia’s biomass emission. One kilogram of each type of biomasses (wood, rice straw, mango seed and mango skin) were burning for 15 minutes in an open burning combustion chamber, designed of 1m×1m steel sample tray, by which the exhaust smoke was treated in the wet packed scrubber system. To study the optimization removal efficiency of the system, three scenarios are proposed. T0 is the condition of biomass burning without treatment. T1 is the condition that exhaust smoke is treated with spray water in the system. T2 is the condition that exhaust smoke is treated with spray water combined with the activated carbon as a packing material in the system. The result show that the removal efficiency is great in T3 scenario in mango seed sample. For other samples, the result was not conclusive as the removal efficiency in each sample was not consistency. The high removal efficiency of particulate matter in mango seed was 70.12% for PM₁₀, 69.79% for PM_2.5, and 71.53% for PM₁. To enhance the quality of research, some aspects require further improvement to achieve the optimal outcome. Since biomass burning remains the main source of boiler energy, there is a need to develop more-cost effective and simpler emission control technologies that can diminish air contaminant before release.

Abstract: Electrocoagulation process was employed for the treatment of river water flows in Iraq. In this study, a batch Electrocoagulation process was used to treat river water taken from Al - Qadisiyah water treatment plant. electrolysis time, voltage and inter-electrode spacing were the most important parameters to study . A statistical model was developed using the RSM model. The optimum condition after studying the parameter effect the process was 1 cm separating, 30 volts . The RSM model shows the ideal condition of removal for both the TSS and turbidity at 1 cm, 20 volts and 55 min.

Abstract: For the purpose of improving the electric discharge machinability of PCD, the authors have proposed a method using an electrode made of a specific transition metal which is easy to react with diamond. As a result, Ti, Nb, Ta, Mo, and W among various reactive metals brought very high efficiency, higher than 3 times of existing electrode materials (Cu, CuW) in the EDM of PCD. It was thought that the higher removal efficiency was due to the material properties such as mixing enthalpy between transition metal atom and carbon atom and a crystal structure of body centered cubic (bcc) lattice.

Abstract: In this study, high salinity wastewater was treated by an intermittently aerated membrane bioreactor (IAMBR) and the salinity loadings were set at 35g/L. The activated sludge was inoculated from the municipal wastewater treatment plant. The influent salinity level gradually increased from 0 to 35 g/L with every 5 g/L. With the salt concentration increased to 35 g/L, the performance of IAMBR was significantly affected by higher salinity. The removal efficiencies of the total organic carbon (TOC), ammonia nitrogen (NH₄⁺-N) and total nitrogen (TN) were about 83%, 70% and 51%, respectively. It is indicated that the domestication of activated sludge from municipal wastewater treatment cannot obtain a better performance at high salinity.

Abstract: This paper provides numerical study of the effects of mixed convection on particles removal from a cavity using multi-relaxation time thermal lattice Boltzmann method (LBM) for compute the flow and isotherm characteristics in the bottom heated cavity located on a floor of horizontal channel. A point force scheme was applied for particles-fluid interactionand double-distribution function (DFF) was coupled with MRT thermal LBM to study the effects of various grashof number (Gr) and Aspect Ratio (AR) on the efficiency of particles removal. The results show that change in Grashof number and Aspect ratio causes a dramatic different in the flow pattern and particles removal efficiency.

Abstract: This research analyzed the effective performance of a laboratory scale vertical surface flow constructed wetland (VSFCW) system, for the treatment of wastewater from fertilizer plant. Two reactors with a volume of 80 L each were used for the experiments. One of the reactors contains 2 units of floating plants known as water hyacinth (Eichhornia Crassipes) while the other was used as a control. The treatment was carried out in 2 phases: the wetland was first fed with treated domestic wastewater for acclimatization and stability and thereafter, fed continuously with analyzed wastewater samples from the fertilizer plant at the flow rate of 8 L/day, surface loading rate of 0.025 kg/m²/day for COD, 0.013 kg/m²/day for Ammonia, 0.021 kg/m²/day for Nitrate, 0.01 kg/m²/day for Nitrite, and 0.01 kg/m²/day for Phosphorus and a hydraulic detention time of 10 days. The treatment was monitored for 27 days and the performances evaluated. Results of the system indicated that the average removal efficiency was 47 % for COD, 89.01 % for ammonia, 83 % for nitrate, 80 % for nitrite, and 81 % for phosphorus. The quality of the discharged effluent from the VSFCW showed that the system may be a viable technology for the wastewater treatment.

Abstract: The feasibility of using constructed wetland to treat saline shipyard wastewater was evaluated in this study. Constructed wetland, acting as an ecological engineering alternative, is capable of reducing NH₄⁺-N、TN、TP and COD from saline shipyard wastewater. The planted unit showed better capability of COD, TN and TP removal than unplanted unit obviously. Treatment performance of planted unit was found to be 77.7-89.1% for COD, 69.2~80.2% for TN and 54.5~85.9% for TP in the stable operation stage. However, the treatment performance of unplanted unit was found to be 55.3-72.4% for COD, 66.0~79.2% for TN and 55.4~85.3% for TP in the stable operation stage.

Abstract: MBBR processes improve reliability, simplify operation and require less space than traditional wastewater treatment systems. The performance of biological membrane carriers is very important to MBBR operating efficiency. Modified HDPE material is more hydrophilic and electropositive. The experiment indicates that: The grafting percent is 3.67% at 40 min exposing time in Acetone-AA-BP system. The outflow COD_Cr and NH₃-N removal efficiency is 87.57~93.12% and 68.82~76.33% respectively in modified HDPE system. The outflow COD_Cr and NH₃-N concentration is content to II series in Discharge standard of water pollutants (DB 11/307-2005).