The effect of co-subtrate on the biodegradation of aniline | |
| Author | Apaporn Luang-a-ram |
| Call Number | AIT Thesis no. EV-97-04 |
| Subject(s) | Sewage--Purification--Activated sludge process Aniline |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-97-04 |
| Abstract | Effect of glucose as co-substrate in wastewater containing aniline on nitrification was investigated in Continuous and Batch aerobic processes. Synthetic wastewater with aniline and glucose as co-substrate were used feed. Aniline degradation by heterotrophs and nitrifiers was investigated for aniline concentration of 150 and 300 mg/L and glucose concentration upto 400 mg/L in feed. Activated Sludge Process (ASP) operated at 13 hours of HRT and 12 days of SRT satisfactorily degraded aniline to nearly l 00 % and heterotrophic activity was virtually independent of influent glucose concentration. However, nitrifier activity was found to be inhibited due to glucose addition as co-substrate in the feed. Beyond 300 mg/L of glucose in the feed, the nitrifying activity was reduced substantially. Nitrobacter seemed to be sensitive than Nitrosomonas. Complete conversion of N02-N to NOrN was not observed at the end indicating that the Nitrobacter activity was affected due to the glucose concentrations higher than 300 mg/L. However, Nitrosomonas activity for conversion NH4-N to NOrN was virtually unaffected due to addition of glucose upto 400 mg/L. Batch tests indicated that the aniline conversion by heterotrophs progressed satisfactorily even upto glucose concentration of 300 mg/L. Conversion of ~-N to NOrN by Nitrosomonas also progressed satisfactorily and activity of Nitrosomonas only marginally reduced. However, Nitrobacter was more sensitive to glucose addition as co-substrate for concentration of 50 mg/Land beyond, conversion of N02-N to N03-N by Nitrobacter dropped to less than 40%. For treatment of wastewater containing toxic compounds such as aniline, with aniline concentration upto 300 mg/L, COD/TN ratio should be maintained lower than 17 in the continuous system. Carbonaceous removal was unaffected at COD/TN ratio upto 26 but COD/TN ratio beyond 17 showed inhibitory effect for nitrification process. For Batch, the COD/TN ratio of 14 was necessary for satisfactory nitrification to occur. |
| Year | 1997 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-97-04 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering (EV) |
| Chairperson(s) | Annachhatre, Ajit P. ; |
| Examination Committee(s) | Samorn Muttamara ;Ishibashi Y.; |
| Scholarship Donor(s) | The Royal Netherlands Government ; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1997 |