| Author | Nguyen Duc Toan |
| Call Number | AIT Thesis no.UE-98-3 |
| Subject(s) | Biochemical oxygen demand
Sewage --Purification
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science. School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | West Lake is located within Hanoi City, the capital of Vietnam. However, water quality in
the lake has been polluted. More precisely, pollution is P- Mezosaprobe type. The major
cause for this has been identified as the direct discharge of wastewater into the Lake.
The construction of a BOD model is needed to serve as a tool for water environmental
management. The model should incorporate both exogenous and endogenous factors to
reflect the effects of climate, waste load, and biological processes in the lake's water body
over time, especially for a long-term perspective.
A relevant BOD model has been developed based on mass balance equation of BOD,
phytoplankton and phosphorus, and calibrated based on available data. The model's
emphasis is placed on relationships between water quality in the Lake and BOD content in
wastewater to assess the water quality change in terms of seasons and time scales. The
model's simulation indicates that water quality of the Lake, with the city's master plan, will
be rapidly degraded in the years to come and will reach a level much lower than the water
quality standard.
Extensive experiments with the model reveal different effects on water quality of different
levels of BOD input reduction. If an acceptable long-term water quality is to be achieved, a
substantial wastewater pre-treatment at sources (to reduce up to 40% BOD input) is required
along with a central treatment plant afterward. The technical and administrative aspects of
wastewater control framework as required have been discussed for implementing, by taking
into account economic efficiency and suitability criteria as well as socio-economic
conditions.
Thus, the study aims to identify the close relationship between the water quality management
and waste water control by subsuming the cause and effect factors that have been widely
recognized, so that water quality can be maintained by controlling discharged wastewater. |
| Year | 1998 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Urban Environmental and Management (UE) |
| Chairperson(s) | Nguyen Luong Bach; |
| Examination Committee(s) | Zimmermann, Willi ;Morishita, Hideharu; |
| Scholarship Donor(s) | Swiss Agency for Development and Cooperation (SDC) ; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1999 |
