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| 008 | 230399s1993 th uzm rtt 00| a1eng d | ||
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| 099 | 9 | _aAIT Thesis no.EV-93-31 | |
| 100 | 0 | _aTran Thi Hong Nhien | |
| 245 | 1 | 0 | _aApplication of the BIOSTYR process in domestic wastewater treatment |
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_aBangkok : _bAsian Institute of Technology, _c1993 |
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_a107 leaves + _e1 online resource |
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_aThesis ; _vno. EV-93-31 |
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| 500 | _aA thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering | ||
| 502 | _aThesis (M.Eng.) - Asian Institute of Technology, 1993 | ||
| 520 | _aA biological aerated filter combines bacterial degradation of pollutant by fixed biomass with physical filtration in a single reactor. An organic removal process has been operated on an experimental basis at a pilot plant over five months at the AIT - Environmental Engineering Division Laboratory. The wastewater feed was modified AIT domestic wastewater. The process consists of a granular media bed, particularly of polystyrene (thus, named biostyr process) with a specific gravity of approximately 0.06. The cylindial reactor was 4 m high and 0.2 m diameter. Headloss measurement was studied as a function of wastewater temperature, velocity and time. Experiments were conducted at 30°C, 38°C, 45°C and 55°C with velocities of 2 m/h, 4 m/h, 6 m/h and 8 m/h respectively. At 38°C, filtration time range was 5.5-10 hours and over 84% of the soluble COD was removed at all velocities investigated. At 30°C, 75.8- 89.4% COD removal was noticed, 89.4% COD removal with the exception of 6 m/h velocity and 8.5 hour filtration time. At 45 °C, 77.1-87.9% of soluble COD was removed, in which 87.9% COD removal could be obtained at 2 m/h velocity with a filtration time of 40 hours. A decreasing gradient of biomass from bottom to top of the reactor was observed. 2- 5.8% of purified water was consumed for backwashing operation. The optimal suspended solids removal occurred at 30°C with 6 m/h velocity. At lower temperature, maximum suspended solid removal could be obtained. The results indicated that effluent SS could be less than 30 mg/L, that is secondary treatment effluent standard in Thailand. | ||
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_aSewage _xPurification _xBiological treatment |
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| 700 | 1 |
_aVisvanathan, C., _eChairperson |
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_aChongrak Polprasert, _eExamination Committee |
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_aFujii, Shigeo, _eExamination committee |
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_aSwedish International Development Agency (SIDA), _eScholarship donor |
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_aAsian Institute of Technology. _tThesis ; _vno. EV-93-31 |
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_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B16681 |
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