| Author | Wu, Sung |
| Call Number | AIT Thesis no.EV-93-17 |
| Subject(s) | Sewage disposal in rivers, lakes, etc.--Chao Phraya River
|
| Note | A Thesis study submitted in partial fulfillment of the
requirements for the degree of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | This study investigates which functional wastewater treatment
system is feasible for a small village on the Chao Phraya
river bank. Analytical results also showed that the quality of
the river water is very poor especially at the raw water
abstraction point for the Bangkok Metropolitan Water Works
Authority. It can be categorized as Class 5 with which· BOD
values are greater than 4 mg/L, and which can only be used for
navigation.
Although the amount of domestic wastewater cannot be assessed
due to the direct and improper discharge into the river, it
was found that the quality of the river is highly polluted.
Thus, an efficient disposal of the domestic wastewater should
be considered to be used by the villagers to minimize the
pollutants discharged into the river.
In this study, the performance of a combined septic tank
proved to be quite excellent. The BOD removal efficiency can
reach 88 % to 93% under the optimum condition, i.e. Media
density 55% and HRT in 6 hrs. The BOD value of effluent was
always under 15 mg/L no matter what the BOD value of influent
was within the range between 42.6 and 124.1 mg/L. Meanwhile,
the removal efficiency of NH3-N can get the percentage range
from 73 % to 85%. The value of NH3 -N of effluent 2 was low
within the range of 1.07 mg/L to 14.2 mg/L. ·Thus, it can be
seen one of the good character of the combined septic tank.
Since the performance of the combined septic tank is quite
excellent, and also had other advantages such as the power
consumption is very low, saving land requirement, and low
operation and maintenance cost. Therefore, we propose that to
renovate the combined septic tank system as an on-site system
to disposal the domestic wastewater generated from the
households alongside the Chao Phraya river bank.
Although the construction cost of the combine septic tank is
quite high, from the site survey, the villagers had the
ability to afford a fraction of construction cost. We
suggested that the government provide the portion subsidy and
low interest loan measures to assist the villagers to renovate
the combine septic tank. |
| Year | 1993 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| 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; |
| Examination Committee(s) | Visvanathan, C.;Bhattarai, Kiran K.; |
| Scholarship Donor(s) | RET-SER Engineering Agency;V.A.C.R.S. of Republic of China; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1993 |