| Author | Durrani, Sardar Muhammad Amjad |
| Call Number | AIT Thesis no. 344 |
| Subject(s) | Biochemical oxygen demand
|
| Note | A thesis submitted in partial fulfillment of the requirements
for the degree of Master of Engineering in the Asian Institute
of Technology, Bangkok, Thailand |
| Publisher | Asian Institute of Technology |
| Abstract | The use of the standard bottle long term biochemical oxygen demand analysis of oxygen uptake in a polluted water is beset by several inherent
difficulties. The formulation of a mathematical model of the oxygen u uptake with time has in the past presented researchers with a complex and time consuming task. The aim of this study was to make use of a simple and direct method
of biochemical oxygen demand (BOD) determination and observe its feasibility for future use also to use the digital computer for BOD data analysis. Water body temperatures of tropical Southeast Asia are not
uncommonly in the vicinity of 30°C. The standard test temperature for BOD analysis in Europe has been chosen at 20°C. A comparison was made between oxygen demand at these two temperatures. The jug dilution technique, using glass bottles of five and ten litres capacities were employed, sixteen samples consisting of eight klong (canal) waters, four
river waters and four primary standards were incubated at 20°C and 30°C. A comparison between the standard bottle technique and the jug dilution
technique was made using mixture of glutamic acid and glucose. Aeration was applied to the samples whenever it was found necessary. All data
were analyzed by the Fujimoto and the log regression techniques. It was observed that the oxygen uptake as measured by the jug dilution technique was generally greater than that of the standard bottle method. The jug dilution technique with slight modification is recommended for future long term BOD studies as a result of this research. The digital computer was successfully applied to the two techniques of BOD analysis. It was found that the Fujimoto technique was comparatively
better than the log regression method. This was due to its wide range of applicability and lesser time required for computations. Nitrification was observed to be successfully inhibited by a concentration of one mg/1
of Allyl Thiourea (ATU) through extension of the commencement of nitrification from six to twenty days. The nitrification stage was not found to conform well with the monomolecular mathematical model as analyzed by the log regression technique. Significant lag periods were observed in the oxygen uptake of river and klong water samples. It was found that
the presence of a lag period does effect the resulting mathematical model. |
| Year | 1969 |
| Type | Thesis |
| School | Student Research Before 1980 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | McGarry, M.G. |
| Examination Committee(s) | Pescod, M.B. ;Ward, Roscoe F. |
| Scholarship Donor(s) | Asian Institute of Technology |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1969 |
