03669nam a2200421 4500 20260818170328.0 th eng .b11687101 AIT Thesis no. EV-97-38 Sermsook Pakkattang Nutrition value and pathogen aspects of Bangkok domestic sludges and potential for agriculture use Bangkok : Asian Institute of Technology, 1997 96 leaves Thesis ; no. EV-97-38 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 The application of Bangkok nightsoil and sewage sludge to agricultural land was investigated considering the nutrition value and pathogen problems. Analysis of two sewage and one nightsoil sludge, a pot study and a field study using sunflowers and grass have been conducted. The investigations showed the suitability of this sludges for reuse in agriculture. A good sludge treatment e.g. anaerobic digestion has a good influence on the sludge characteristics, such as lower numbers in fecal coliforms and no presence of parasites together with high nitrogen content ( ~ 4% N). The application of two sludges to a field study with sunflowers showed linearly relations between nitrogen application and grain yield. The application of 120 kg N/ha with sewage sludge from Huay Kwang showed the highest yield. This results are comparable to the 80 Kg N/ha application with chemical fertilizer. Nitrogen applied by sludge is not immediately available because of the required mineralization in the soil whereas available phosphorus and exchangeable potassium in the soil were raised, which proved to have certain benefitial effects on crop yield. In terms of pathogens the sludge amended soils have to be left more than three months after sludge application to reduce the fecal coliforms until less than 2 MPN per 2 gram wet weight (the lowest detectable number). The field study with grass showed a linearly relation between nitrogen application and fresh biomass yield. The liquid sludge application seemed to be most suitable. Considering aesthetic aspects the grass fields have to be left 110 days to receive a fecal coliforms free soil. Sewage sludge as fertilizer Eckhardt, Ing. Heinz, Chairperson Ishibashi, Yoshinobu, Examination committee Tinsley, Richard L., Examination committee Preeda Pakpian, Examination Committee Royal Thai Government, Scholarship donor Asian Institute of Technology. Thesis ; no. EV-97-38 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B13992 .b11687101 mnait y 240403 0 971211 m a y 0 mnait mnait mnarc 20 40 Barcode : 30050120656342 CREATED : 1996-07-14 RECORD # : i12037175 LPATRON : 1020694 LCHKIN : 2015-10-27 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 7 TOT RENEW : 2 Barcode : 30050120656334 CREATED : 1996-07-14 RECORD # : i12037187 LPATRON : 1018758 LCHKIN : 2005-01-07 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 26 TOT RENEW : 7 Barcode : 30050160078225 CREATED : 2016-05-23 RECORD # : i12986872 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 82236 82236 0 0 0 0 MAIN MAIN mnait 2026-08-18 10.00 0 AIT Thesis no. EV-97-38 30050120656342 2026-08-18 17:03:28 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 10.00 0 AIT Thesis no. EV-97-38 30050120656334 2026-08-18 17:03:28 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. EV-97-38 30050160078225 2026-08-18 17:03:28 2026-08-18 40