| Author | Adisak Thongkaimook |
| Call Number | AIT Thesis no.EV-80-15 |
| Subject(s) | Biogas--Economic aspects
|
| 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 | The purposes of this study were to collect available information on the biogas production technologies commonly used in the tropics, to give a
comparison on the advantages and disadvantages of each system, and to make an economic analysis inorder to determine optimum size of the unit, The Chinese design biogas unit with fixed-dome type and the Indian design with a metal gasholder were chosen in this study because original designs
of biogas units in many Asian countries are developed from these two systems.
The advantages of the Chinese design biogas unit are low construction cost and no rusting problem on the metal gasholder as in the Indian design.
The removal efficiency of the Chinese design biogas unit is quite high because the outlet chamber is located as half as high of the digester so the parasite eggs in the effluent are reduced. The major advantages of the Indian design is the installation of partition wall in the digester which can increase gas production and efficiency of removal. Results from the economic analysis show ·that the Chinese design bio
gas unit is more economical than the Indian design due to its low capital and maintenance costs. It is found that the Chinese design biogas unit capacity should be bigger than 3.6 m3 to be economically feasible where
as the Indian design biogas unit this figure is 7.2 m3 where using 12% interest rate. And for rate of interest is equal to 15%, the optimum sizes of the unit are 5.1 m3 and 8.4 m3 for Chinese design and Indian
design biogas unit respectively.
The net present values of all Chinese design biogas units are positive but for the Indian design, one of the three types under study has positive net present value. The benefit cost ratio of the Chinese design
biogas unit ranges between 1.16 to 1.54 and for the Indian design, it ranges between 0.87 to 2.15. The generating costs of biogas produced from the Chinese and Indian design biogas units vary from 2.13 to 4.07 Baht/m3
which are cheaper than the fuel gas about 2 or 3 times. |
| Year | 1980 |
| 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 | Environmental Engineering and Management (EV) |
| Chairperson(s) | Samorn Muttamara ; Lohani, Bindu N.
|
| Examination Committee(s) | Nguyen, Cong Thanh
|
| Scholarship Donor(s) | New Zealand Government |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1980 |