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005			20260817171007.0
008			th eng
035			_a.b11687137
099		9	_aAIT Thesis no. EV-97-41
100	0		_aSoraya Pholkerd
245	1	0	_aBacteriophage removal in constructed wetlands
260			_aBangkok : _bAsian Institute of Technology, _c1997
300			_a70 leaves
490	1		_aThesis ; _vno. EV-97-41
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development
502			_aThesis (M.Sc.) - Asian Institute of Technology, 1997
520			_aThe performance of constructed wetlands in the removal of pathogenic indicators, especially the viral indicators (bacteriophages) and the bacterial indicators (fecal coliforms and fecal streptococci) was evaluated. Four laboratory-scale and one pilot-scale free-water surface (FWS) constructed wetland units were used to evaluate the kinetic coefficients of bacteriophages, fecal coliforms and fecal streptococci die-offs into the wetland beds. The emergent plants, cattails (Typha), were planted in the constructed wetland units. The experimental results indicated that the organic loading rate (OLR) of 50 kgCOD/(ha.day) and the HR.Ts of 0.5-5 days resulted in the bacteriophage removal of 57-94%, while fecal coliform and fecal streptococci removal ranged from 60 to 97%. Under these conditions, the BOD5 removal was 47-74%, while the COD and SS removal efficiencies were 33-60% and 71- 96%, respectively. TKN and Total-P removal were 25-65% and 16-34%, respectively. The removal efficiencies of bacteriophage, fecal coliform and fecal streptococci during the post-harvesting periods were found to be better than tho~e during the pre-harvesting periods because of more sunlight exposure to the wetland beds during the post-harvesting periods. With respect to the kinetic studies, the k20 of the bacteriophage were 0.13 day" 1 for the pre harvesting and post-harvesting periods. However, for the fecal coliform and fecal streptococci, the k20 was found to be 0.16 and 0.18 da/ during the pre-harvesting and post-harvesting periods, respectively.
650		0	_aConstructed wetlands
700	0		_aChongrak Polprasert, _eChairperson
700	1		_aIshibashi, Yoshinobu, _eExamination committee
700	0		_aSamorn Muttamara, _eExamination Committee
710	2		_aDanish International Development Assistance (DANIDA), _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. EV-97-41
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B13995
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