| Author | Pema Choda |
| Call Number | AIT Thesis no. EV-97-13 |
| Subject(s) | Sewage lagoons--Bhutan--Thimphu
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of the Master of Engineering, School of Environment, Resource and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-97-13 |
| Abstract | The research was carried out to evaluate the operational performance of the waste
stabilization ponds in Thimphu and design a waste stabilization ponds system to serve the
population not covered by the present waste treatment plant. Chemical analysis of the pond
influent and effluent were carried out and analysed. Besides other parameters like
meteorological data and field observations were used to assess the pond performance.
The analytical results revealed that the two anaerobic ponds and the facultative pond
were under-loaded due to low flow. On the other hand maturation pond was found to be overloaded. The effluent suspended solids contain almost entirely of algal cells, which increases
from low dl:lring winter to almost three times during spring (April 1997). Ammonia - nitrogen
in the raw wastewater was quite high and removal rate was around 50% only. Faecal coliform
removal was satisfactory, however it was observed that the removal decreased as the effluent
suspended solids increased. In general the ponds were found to be working quite satisfactorily.
The pond design was based on the mean pond temperature of the coldest month.
Anaerobic ponds were designed based on volumetric loading and facultative pond design was
based on surface areal loading. Maximum loading rate applied were 1 OOg BOD5 /m3
.d for the
anaerobic ponds and 1 OOkg BODs/ha.d for facultative ponds. Design of maturation pond was
mainly based on the removal of faecal coliform, however, some BOD removal is achieved also. |
| Year | 1997 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-97-13 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | Annachhatre, Ajit P.; |
| Examination Committee(s) | Nguyen Thi Kim Oanh;Purkar, Nitin Afzul ; |
| Scholarship Donor(s) | DANIDA; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1997 |