[ Objective] The research aimed to study pre-treatment effect of the domestic sewage by water-dropping aeration zeolite bed technology. [ Method] By water-dropping aeration manner, we conducted sewage reoxygenation. Z...[ Objective] The research aimed to study pre-treatment effect of the domestic sewage by water-dropping aeration zeolite bed technology. [ Method] By water-dropping aeration manner, we conducted sewage reoxygenation. Zeolite was used to replace traditional contact oxidization fill- er. We inspected oxygenation effect of the water-dropping aeration manner and removal efficiency of the pollutant in sewage after biological contact oxidation. [ Result] Under the experimental condition with water-dropping heights of 0.30, 0.45 and 0.60 m, average added values of the dissolved oxygen for raw water were respectively 2.4, 3.6 and 4.2 rag/l_ after water-dropping aeration. Under the situation with average HRT of 2 h, when COD, TN and TP of the influent were respectively 309.0 -464.0, 33.3 -95.0 and 4.0 -7.5 mg/L, their corresponding average removal rates were 47.25%, 46.39% and 40.75%. [ Conclusion] The research conducted useful attempt for high-efficiency and low-cost treatment of the domestic sewaqe in rural area.展开更多
This study addresses the limitations of current aerial water-dropping models,which primarily focus on single-aircraft operations,with limited research on multi-aircraft firefighting strategies that could significantly...This study addresses the limitations of current aerial water-dropping models,which primarily focus on single-aircraft operations,with limited research on multi-aircraft firefighting strategies that could significantly enhance firefighting efficiency.Additionally,current model calibration techniques often rely on the real testing of firefighting,leading to a high cost of implementation.To overcome these challenges,an effective fire extinguishing model based on turbulent jet principles is developed to improve the efficiency of multi-aircraft firefighting,and an analytical solution is derived to the parameter optimization.To reduce the cost of the model calibration,a cost-effective calibration method is proposed without the requirement of setting a real fire in the grassland based on image processing techniques,which enables the determination of model parameters at reduced operational expenses.Furthermore,simulations and practical experiments validate the effectiveness of both the model and the calibration method,demonstrating substantial benefits in improving aerial firefighting strategies.展开更多
基金Supported by Science and Technology Key Special Item of the National Water Body Pollution Control and Treatment, China(2010BAC68B02)
文摘[ Objective] The research aimed to study pre-treatment effect of the domestic sewage by water-dropping aeration zeolite bed technology. [ Method] By water-dropping aeration manner, we conducted sewage reoxygenation. Zeolite was used to replace traditional contact oxidization fill- er. We inspected oxygenation effect of the water-dropping aeration manner and removal efficiency of the pollutant in sewage after biological contact oxidation. [ Result] Under the experimental condition with water-dropping heights of 0.30, 0.45 and 0.60 m, average added values of the dissolved oxygen for raw water were respectively 2.4, 3.6 and 4.2 rag/l_ after water-dropping aeration. Under the situation with average HRT of 2 h, when COD, TN and TP of the influent were respectively 309.0 -464.0, 33.3 -95.0 and 4.0 -7.5 mg/L, their corresponding average removal rates were 47.25%, 46.39% and 40.75%. [ Conclusion] The research conducted useful attempt for high-efficiency and low-cost treatment of the domestic sewaqe in rural area.
基金supported by the“Intelligent Multi-source Autonomous Navigation”Basic Science Center Programthe General Programs of National Natural Science Foundation of China(Grant Nos.62388101,52372434,52472439)Aeronautical Science Foundation of China(Grant No.2019ZA053008)。
文摘This study addresses the limitations of current aerial water-dropping models,which primarily focus on single-aircraft operations,with limited research on multi-aircraft firefighting strategies that could significantly enhance firefighting efficiency.Additionally,current model calibration techniques often rely on the real testing of firefighting,leading to a high cost of implementation.To overcome these challenges,an effective fire extinguishing model based on turbulent jet principles is developed to improve the efficiency of multi-aircraft firefighting,and an analytical solution is derived to the parameter optimization.To reduce the cost of the model calibration,a cost-effective calibration method is proposed without the requirement of setting a real fire in the grassland based on image processing techniques,which enables the determination of model parameters at reduced operational expenses.Furthermore,simulations and practical experiments validate the effectiveness of both the model and the calibration method,demonstrating substantial benefits in improving aerial firefighting strategies.
