03136nas a2200253 i 450000500170000000800410001703500150005810000200007324501190009326000520021230000140026449000260027850001520030450200570045652019700051365000300248365000250251370000400253870000460257870000590262471000760268381000580275985600650281720260818143617.0090300s1999    th uu m rtt   0|  a1eng d  a.b1177986x0 aNguyen Duc Toan13aAn integrative BOD model for municipal wastewater control to maintain water quality in the west lake of Hanoi city  aBangkok :bAsian Institute of Technology,c1999  a99 leaves1 aThesis ;vno. UE-98-3  aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Science. School of Environment, Resources and Development  aThesis (M.Sc.) - Asian Institute of Technology, 1999  aWest 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. 0aBiochemical oxygen demand 0aSewagexPurification0 aNguyen Luong Bach,eChairperson    1 aZimmermann, Willi,eExamination Committee1 aMorishita, Hideharu,eExamination committee           2 aSwiss Agency for Development and Cooperation (SDC),eScholarship donor 2 aAsian Institute of Technology.tThesis ;vno. UE-98-3  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B12331