Modelling is a tool used to simulate the performance of any type of WWTP(wastewater treatment plant)which empowers the user to optimize the response of works by changing influent loads and operational conditions with ...Modelling is a tool used to simulate the performance of any type of WWTP(wastewater treatment plant)which empowers the user to optimize the response of works by changing influent loads and operational conditions with minimum effort and low cost.STOAT(sewage treatment operational analysis over time)software is used to simulate the performance of wastewater treatment plants dynamically.In this paper,a model was built by STOAT software for the Hannoville WWTP allowing to analyze and study the enquiries in a shorter period of time associated with laboratory analysis.Additionally,the model can be used to estimate the response of the system to a diversity of problems.The hydraulic shock load was tested for the entire WWTP consequently allowing the application of strategies that guarantee a better performance by presenting the analysis for the entire plant.Through the aid of STOAT software,a model was built for the whole plant with daily sewage volume entering the treatment plant in a year.The study showed whether the plant can accept a higher flow than that it regularly receives or not.This proved to be successful and the plant has the possibility to accept double the hydraulic shock load,meanwhile,the variations of resulting data were acceptable when compared to the Egyptian environmental requirements.展开更多
The life of Nitrile Butadiene Rubber(NBR) O-ring seal having shore hardness of A70 and A90 under shock loading conditions was investigated by a specially designed pneumo-hydraulic shock test rig. Shock tests have been...The life of Nitrile Butadiene Rubber(NBR) O-ring seal having shore hardness of A70 and A90 under shock loading conditions was investigated by a specially designed pneumo-hydraulic shock test rig. Shock tests have been carried out on bare seals, seal with conventional polytetrafluoroethylene(PTFE) back-up rings and seal with newly developed carbon composite back-up rings to study its behaviour under different operating conditions until failure. Experiments were conducted by varying annular gap ranging from 0.3 to 0.5 mm, oil temperature from 30 ℃ to 70 ℃ and rate of pressure rise from 600 to 2400 MPa/s. Significant enhancement in seal life was observed with carbon composite back-up ring at reduced annular clearances compared to seal life with conventional PTFE back-up ring and without back-up rings.展开更多
文摘Modelling is a tool used to simulate the performance of any type of WWTP(wastewater treatment plant)which empowers the user to optimize the response of works by changing influent loads and operational conditions with minimum effort and low cost.STOAT(sewage treatment operational analysis over time)software is used to simulate the performance of wastewater treatment plants dynamically.In this paper,a model was built by STOAT software for the Hannoville WWTP allowing to analyze and study the enquiries in a shorter period of time associated with laboratory analysis.Additionally,the model can be used to estimate the response of the system to a diversity of problems.The hydraulic shock load was tested for the entire WWTP consequently allowing the application of strategies that guarantee a better performance by presenting the analysis for the entire plant.Through the aid of STOAT software,a model was built for the whole plant with daily sewage volume entering the treatment plant in a year.The study showed whether the plant can accept a higher flow than that it regularly receives or not.This proved to be successful and the plant has the possibility to accept double the hydraulic shock load,meanwhile,the variations of resulting data were acceptable when compared to the Egyptian environmental requirements.
文摘The life of Nitrile Butadiene Rubber(NBR) O-ring seal having shore hardness of A70 and A90 under shock loading conditions was investigated by a specially designed pneumo-hydraulic shock test rig. Shock tests have been carried out on bare seals, seal with conventional polytetrafluoroethylene(PTFE) back-up rings and seal with newly developed carbon composite back-up rings to study its behaviour under different operating conditions until failure. Experiments were conducted by varying annular gap ranging from 0.3 to 0.5 mm, oil temperature from 30 ℃ to 70 ℃ and rate of pressure rise from 600 to 2400 MPa/s. Significant enhancement in seal life was observed with carbon composite back-up ring at reduced annular clearances compared to seal life with conventional PTFE back-up ring and without back-up rings.
