| Author | Prakart Buttamart |
| Call Number | AIT Thesis no. EV-97-36 |
| Subject(s) | Sewage--Purification--Biological treatment
|
| 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 |
| Series Statement | Thesis ; no. EV-97-36 |
| Abstract | This study on biological treatability of petrol wastewater was carried out at a petrol
station in Bangkhun, Thailand. The experiments was conducted on laboratory scale by using a
Sequencing Batch Reactor (SBR) at the ambient laboratory of the Environmental Engineering
Division, Asian Institute of Technology (AIT).
Six experiments were done and divided into two groups namely A (RunA 1, RunA2,
RunA3) and B (RunBl, RunB2, RunB3). These groups were differed by an inaerated and
aerated time-ratio and batch-cycle duration as follows:
Group A: Wastewater batch-cycle of 12 hours (2 cycles/day) with various an
inaerated and aerated time-ratio of 1: 1, 2: 1 and 4: 1 for RunA 1,
RunA2, and RunA3 respectively.
Group B: Wastewater batch-cycle of 8 hours (3 cycles/day) with various an
inaerated and aerated time-ratio of 1: 1, 2: 1 and 4: 1 for RunB 1,
RunB2, and RunB3 respectively.
The highest removal efficiencies of COD and SS were found to be 77% and 70%
respectively in RunA 1. Although the removal efficiencies can be improved but it is not
necessary when the petrol station wastewater is treated by a pretreatment leading to meet the
effluent standard prior to discharge to public sewers. The less efficient but more energy saving
of COD and SS removal were achieved with the values of 62% and 52% respectively in
RunB 1. On the other hand, it was found that the optimum parameters of the SBR for COD and
SS removal were achieved with an inaerated and aerated time-ratio of 1: 1 (a 5 and 3.5 hours
inaerated and aerated reaction period for RunAl and RunB 1 respectively).
In view of grease and oil removal, the efficiencies were achieved between 58% to 63%
for experiment of group A and 50% to 58% for experiment of group B .. These values varied
insignificantly as different parameters were used for the SBR and their choice that can be
considered irrelevant.
The average effluent for overall experiments of pH showed an increased value of 7.4 to
8.6 when compared to influent of 7.0 to 7.6. These values are acceptable and can be discharged
to the municipal sewers directly.
The effluent qualities varied as per choice of parameter. All qualities were satisfactory and
meeting the Thai effluent standards and the final choice of parameters would need to be a
balance between energy savings and the quality of effluent. |
| Year | 1997 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-97-36 |
| 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) | Samorn Muttamara |
| Examination Committee(s) | Annachhatre, Ajit P.;
Ishibashi, Yoshinobu |
| Scholarship Donor(s) | AIT Partial Scholarship Program;
National Petrochemical Public Company Limited |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1997 |