03015nas a2200421 4500 20260818170321.0 301098s1983 th r 000| 0eng d .b1047187x AIT Thesis no.EV-83-5 Bautista, Mendeluz B. Nutrient release from lake sediments Bangkok : Asian Institute of Technology, 1983 94 leaves : ill. Thesis ; no. EV-83-5 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science Thesis (M.Sc.) - Asian Institute of Technology Diffusional fluxes ranging from 14-30 mg NH4/m2-d and 0.1-0.5 mg P04/m2-d were computed for Laguna Lake sediments. Laboratory and in situ experimental results ~ielded rates of release in the order of 5-8 mg TIN/m2-d and 0.5-0.8 mg DIP/m -d. On the other hand, nutrient budget calculations for TIN during the 1973-1977 period showed slightly lower values, 4-5 mg TIN/m2-d, which are believed to be overestimates since the larger component would be accounted for by internal recycling of N in the water column. DIP budget calculations revealed P uptake by the sediments instead of release over the four-year period at rates of 0.8-1.0 mg DIP/m2-d. Based on these, Laguna Lake sediments would not be major sources of nutrients and, as in the case of phosphorus, could even serve as a nutrient sink. The transport of N across the sediment-water.interface was not as predo- minantly controlled by the concentration gradient between the two phases, as was P flux. This indicates that the mechanism for P release involves mainly equilibrium-controlled chemical_processes, which are less prevalent in N sedi- ments enhanced TIN release while DIP release was inhibited under aerobic condi- tions. Water Purification Filtration Filters and filtration Samorn Muttamara, Chairperson Chongrak Polprasert, Examination Committee Omura, Tatsuo, Examination Committee US-ASEAN Development Cooperation Program, Scholarship Donor Asian Institute of Technology. Thesis ; no. EV-83-5 .b1047187x mnait x 231005 2 951012 m a x 0 mnait mnarc mnait 22 40 20 Barcode : 30050120655401 CREATED : 2014-05-02 RECORD # : i12757548 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120224976 CREATED : 2016-04-05 RECORD # : i12969643 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050121075112 CREATED : 2023-03-17 RECORD # : i13438724 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 82195 82195 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.EV-83-5 30050120655401 2026-08-18 17:03:21 3 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.EV-83-5 30050120224976 2026-08-18 17:03:21 2026-08-18 40 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.EV-83-5 30050121075112 2026-08-18 17:03:21 1 2026-08-18 20