04836nas a2200481 i 4500 20260817163817.0 170699s1987 th u m rtt 0| a1eng d .b10100866 AIT Diss. no. EV-87-2 Shin, Hyun-kook Attached-growth waste stabilization pond treatment Bangkok : Asian Institute of Technology, 1987 171 p. : ill. Dissertation ; no. EV-87-2 A dissertation submitted in the partial fulfillment of the requirements for the degree of Doctor of Engineering, School of Environment, Resources and Development Thesis (Ph.D.) - Asian Institute of Technology, 1987 Research was conducted to improve waste stabilization pond (WSP) performance through the installation of artificial media, made of po l yv i.ny l.Ldene chloride, in the laboratory-scale and pilot-scale experimental pond units. The WSP incorporating attached-growth media are called attached-growth waste stabilization ponds (AGWSP) . The experimental results obtained from this study showed that improved performance of WSP could be achieved through the installation of attached-growth media in the pond water. The media enhanced the growth of attached biomass, especially heterotrophic bacterial concentrations in the system, and consequently leading to better organic and nutrient removal. The attached-growth media also attached or adsorbed some of the dispersed growth microorganisms and other suspended solid particles, thus less suspended solid concentrations present in the AG\vSP effluents. However, a distinct advantage with respect to fecal coliform removal could not be observed, probably because of the clumping of fecal coliform cells to the attached-growth media and some shading effects of the media itself. Dissolved oxygen and pH values in the AGWSP water were slightly decreased with increasing the media fraction in the pond. Based on the kinetic studies, the maximum specific growth rate of the heterotrophic bacteria was found to increase with increasing the media fraction in the pond water, while the half-velocity constants were not significantly affected. Data from laboratory-scale AGWSP experiments showed better NHl-N removal in the AGWSP units than those in the control units without attached-growth media. The main mechanism of NHl-N removal in the AGWSP units was found to be through biological uptake of NHl-N by the attached and dispersed biomass, while volatilization and nitrification had little effects on NHJ-N removal. Regression equations of various NHl-N removal rates in AGWSP were developed and validated with data from the pilot-scale AGWSP experiments and some field-scale WSP. Pond performances were evaluated with a simulation model based on mass balance equations. The simulated results were more or less comparable to the experimental data of AGWSP units, validating the beneficial effects of AGWSP in wastewater treatment. Since the attached-growth media are easy to maintain and do not require as much skillful operation as that of the aquatic weed ponds, their installation in WSP to improve the pond performance with respect to organic and nutrient removal should be considered when necessary. Sewage lagoons Chongrak Polprasert, Chairperson Orth, H., Examination Committee Vigneswaran S., Examination Committee Wee, K.L., Examination Committee Hanaki, K. Examination Committee Middlebrook, E. J., Examination Committee Government of Japan, Scholarship Donor Asian Institute of Technology. Dissertation ; no. EV-87-2 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B18950 .b10100866 mnait m 240411 2 951012 m a m 0 mnait mnait mnarc mnarc 22 40 20 Barcode : 30050120726301 CREATED : 2012-08-16 RECORD # : i12687285 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160036504 CREATED : 2016-01-02 RECORD # : i12875983 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050121074438 CREATED : 2023-03-29 RECORD # : i1344086x LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050121052236 CREATED : 2023-08-11 RECORD # : i13471132 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 9843 9843 0 0 0 0 MAIN MAIN mnait 2026-08-17 0 AIT Diss. no. EV-87-2 30050120726301 2026-08-17 16:38:17 3 2026-08-17 22 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Diss. no. EV-87-2 30050160036504 2026-08-17 16:38:17 1 2026-08-17 40 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Diss. no. EV-87-2 30050121074438 2026-08-17 16:38:17 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Diss. no. EV-87-2 30050121052236 2026-08-17 16:38:17 2 2026-08-17 40