TY  - BOOK
AU  - Soraya Pholkerd
AU  - Chongrak Polprasert,
AU  - Ishibashi,Yoshinobu
AU  - Samorn Muttamara,
ED  - Danish International Development Assistance (DANIDA),
TI  - Bacteriophage removal in constructed wetlands
T2  - Thesis
PY  - 1997///
CY  - Bangkok
PB  - Asian Institute of Technology
KW  - Constructed wetlands
N1  - A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development; Thesis (M.Sc.) - Asian Institute of Technology, 1997
N2  - The 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.
UR  - http://203.159.5.9/ait-thesis/detail.php?q=B13995
ER  -