Dynamic modeling of hydrogen sulfide production in sewers | |
| Author | Pichet Chaiwiwatworakul |
| Call Number | AIT Thesis no.WM-02-14 |
| Subject(s) | Hydrogen sulphide Models and modelmaking |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | Hydrogen sulfide causes the health risk problems and corrosion in sewer network. In severe cases, the problems are as serious as death or failure of the pipe system. Therefore, it is necessary to understand deep down to the stem in details and indicate where and when those problems could take place. The hydrogen sulfide formation in sewer is complicated mechanism and it is involved in many sub-processes. The easy tools for forecasting hydrogen sulfide production in sewers are empirical models. However, they cannot describe the phenomenon deep in details. In addition, since they are designed for running only under anaerobic condition, they cannot be applied to the gravity sewer which is considered as transient aerobic-anaerobic condition system. So, the hydrogen sulfide model in this study is based on the model concept that has been further developed from conventional anaerobic processes model. The advantage of such new model concept is the capability to simulate aerobic as well as anaerobic processes including the transition between these two states. Moreover, by integration of the sub-processes equations relating to hydrogen sulfide production which have been already investigated in the certain level, as the result, the new model will be able to illustrate hydrogen sulfide in water phase with more flexibility and details. Hydrogen sulfide models are applicable only for steady state system. It does not support the changes in sewer dynamically. Because of this, in the study, hydrodynamic model and advection-dispersion model will be combined together. The advantage of hydrodynamic model is the ability to simulate for fluctuated system, while advection-dispersion model provides the transportation of pollutants along sewers. After the new hydrogen sulfide module has been developed, the sensitivity analysis on each related parameter is done to determine important parameters and processes. Then the model is compared to the empirical models in terms of input data requirement, accuracy and processing time by using the same data from Sweden, Germany and Australia. However, the limitation of data requirement, which is much more needed in the new model and cannot be provided by the existing database, handicaps the new model to present obviously different result compared to those from empirical models. Although the result is still not outstanding, the study is one of attempts to find out more flexible and reliable tools to be used in urban wastewater management, mainly in the hydrogen sulfide issues. |
| Year | 2003 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Engineering and Management (WM) |
| Chairperson(s) | Sutat Weesakul ;Mark, Ole |
| Examination Committee(s) | Gupta, Ashim Das ;Tawatchai Tingsanchali ;Annachhatre, Ajit |
| Scholarship Donor(s) | Royal Thai Government |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2003 |