| Author | Vichakorn Jamikorn |
| Call Number | AIT Thesis no.EV-98-36 |
| Subject(s) | Sewage--Purification--Activated sludge process
|
| Note | A thesis submitted in partial fulfilment of the requirements for the degree of Master of
Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | The experiments are conducted to investigate the performance of the UASB
reactor in order to treat the ethylene glycol wastewater containing Chemical Oxygen
Demand (COD) of 1,500 mg/L from paint industry.
Ethylene Glycol is one of the solvent that is used in paint industty. It is dihydric
alcohol HOCH-CHOH as it was intermediate between the monohydric ethyl alcohol on
one hand and the trihydric glycerol on the other.
The reactor startup was accomplished about 90 days, successfully achieved
using seed acclimatided granule sludge from Upflow Anaerobic Sludge Blanket
(UASB) treating tapioca starch wastewater.
The experiments were run into two conditions. One the reactor was run under
the conditions upflow velocity 0.5m./hr. and recirculation ratio 1 :3. At the steady
state the COD removal efficiency was 96.33 %, the gas production was 0.067 m3
/day,
the Volatile Fatty Acid (VFA) was 360 mg VFA as acetic acid /L, the gas production
rate per liter of wastewater was 0.95 LIL/day, the methane gas composition was 62.40
%, and COD fraction for biological growth was 31.20 %. And after that, the reactor run
under the condition upflow velocity 0.15 m./hr. and no recirculation. At the steady
state the COD removal efficiency was 96.89 %, the gas production was 0.036 m3
/day,
the Volatile Fatty Acid (VF A) was 200 mg VF A as acetic acid /L, the gas production
rate per liter of wastewater was 1.27 LIL/day, the methane gas composition was 69.38
%, and COD fraction for biological growth was 7.09 %.
Beyond stait up period, at the steady state, it has found that the COD removal
efficiency of the reactor were nearly the same from different upflow velocity and
recirculation (different flowrate). The gas production at upflow velocity 0.5 m/hr and
Recirculation ratio 1 :3 and at upflow velocity 0.15 m/hr the volatile fatty acid (VFA)
on the upflow velocity 0.5 m./hr. and recirculation ratio 1 :3 were generated more than
the upflow velocity 0.15 m./hr. and no recirculation. But the gas production rate per
liter of wastewater, the methane gas production rate per liter of wastewater, the
methane gas composition were lower, and the recirculation ratio was more effective
than upflow velocity or hydraulic retention time in term of the net COD fraction for
biological growth. |
| Year | 1998 |
| 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) | Annachhatre, Ajit P.; |
| Examination Committee(s) | Eckhardt, Heinze Ing. ;Ozaki, Hiroaki; |
| Scholarship Donor(s) | Dopount Thailand ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1998 |