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 endemic fauna of New Zealand evolved in the absence of mammalian predators and their introduction has been responsible for many extinctions and declines.Introduced species including possums(Trichosurus vulpecula K...The endemic fauna of New Zealand evolved in the absence of mammalian predators and their introduction has been responsible for many extinctions and declines.Introduced species including possums(Trichosurus vulpecula Kerr),ship rats(Rattus rattus L.)and stoats(Mustela erminea L.)are targeted to protect native birds.Control methodologies currently rely largely on labor-intensive trapping or the use of increasingly unpopular poisons,or poisons that are linked with low welfare standards.Hence,the development of safer humane predator toxins and delivery systems is highly desirable.Para-aminopropiophenone(PAPP)is being developed as a toxin for feral cats(Felis catus L.)and stoats.Carnivores appear to be much more susceptible to PAPP than birds,so it potentially has high target specificity,at least in New Zealand.Pen trials with 20 feral cats and 15 stoats have been undertaken using meat baits containing a proprietary formulation of PAPP.A PAPP dose of 20-34 mg kg^(-1)was lethal for feral cats and 37-95 mg kg^(-1)was lethal for stoats.Our assessments suggest that PAPP,for the control of feral cats and stoats,is a humane and effective toxin.PAPP causes methaemoglobinaemia,resulting in central nervous system anoxia,lethargy and death.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 endemic fauna of New Zealand evolved in the absence of mammalian predators and their introduction has been responsible for many extinctions and declines.Introduced species including possums(Trichosurus vulpecula Kerr),ship rats(Rattus rattus L.)and stoats(Mustela erminea L.)are targeted to protect native birds.Control methodologies currently rely largely on labor-intensive trapping or the use of increasingly unpopular poisons,or poisons that are linked with low welfare standards.Hence,the development of safer humane predator toxins and delivery systems is highly desirable.Para-aminopropiophenone(PAPP)is being developed as a toxin for feral cats(Felis catus L.)and stoats.Carnivores appear to be much more susceptible to PAPP than birds,so it potentially has high target specificity,at least in New Zealand.Pen trials with 20 feral cats and 15 stoats have been undertaken using meat baits containing a proprietary formulation of PAPP.A PAPP dose of 20-34 mg kg^(-1)was lethal for feral cats and 37-95 mg kg^(-1)was lethal for stoats.Our assessments suggest that PAPP,for the control of feral cats and stoats,is a humane and effective toxin.PAPP causes methaemoglobinaemia,resulting in central nervous system anoxia,lethargy and death.
