AI SearchEffects of heterotrophic activity on nitrification (Record no. 35165)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 04920cas|a2200469 i 4500 |
| 005 - DATE AND TIME OF LATEST TRANSACTION | |
| control field | 20260818095246.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 181197s1987 th u m rtt 0| a eng d |
| 035 ## - SYSTEM CONTROL NUMBER | |
| System control number | .b10230506 |
| 099 #9 - LOCAL FREE-TEXT CALL NUMBER (OCLC) | |
| Classification number | AIT Diss. no. EV-87-1 |
| 100 0# - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Chalermraj Wantawin |
| 245 10 - TITLE STATEMENT | |
| Title | Effects of heterotrophic activity on nitrification |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. | |
| Place of publication, distribution, etc. | Bangkok : |
| Name of publisher, distributor, etc. | Asian Institute of Technology, |
| Date of publication, distribution, etc. | 1987 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 202 p. |
| 490 1# - SERIES STATEMENT | |
| Series statement | Dissertation ; |
| Volume/sequential designation | no. EV-87-1 |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | Thesis (Ph.D.) - Asian Institute of Technology, 1987 |
| 520 ## - SUMMARY, ETC. | |
| Summary, etc. | The investigation on the mutual relationships between heterotrophic and nitrifying activity in the same stage of continuous process was done in order to determine the relationships aside from the certain effects of sludge age and dissolved oxygen which usually were referred to be the reasons for no nitrification in reactors receiving high organic loading. More emphasis was placed on to clarify whether the heterotrophic growth exerts the adverse effects on nitrification. Chemostats were employed with various values of investigated hydraulic retention time which is equal to sludge age in once through reactor. Ammonia was fed without organic carbon in one series of experiment as the control and ammonia was fed with different concentration of organic carbon in other series to introduce the different degree of the growth of terotrophsin the system. Experimental data collected at steady state in this study reveals that utilization of ammonia for heterotrophic cell synthesis exhibited the preferential process over nitrification and the extent of achievable high ammonia removal by nitrifying organism was dependent on the growth of heterotrophs . Inhibition on the growth of ammonia oxidizers by the presence of heterotrophs was found, more ammonia leakage being observed under higher COD concentration in the influent. The larger value of saturation constant for ammonia oxidation in Monod equation, K 1 was obtained from the data of system fed with higher s' influent COD concentration, which means the low affinity of ammonia with ammonia oxidizers under the high activity of heterotrophs. More inhibition on nitrification has been observed when heterotrophs grew excessively during the transient state than that under steady state condition. Accumulation of ammonia was found in this period and was adequately explained by the simulation of the model in which the increase of Ks 1 value with the temporary increase of the heterotrophs was taken s, into account. Reduced dissolved oxygen level controlled at 0.5 mg/l did not affect ammonia oxidation but nitrite oxidation in the control and nitrite was accumulated up to 60 mg/l at hydraulic retention time of 6.5 days . The degree of inhibitory effect of ammonia oxidation in the presence of heterotrophs increased under this reduced dissolved oxygen concentration. Providing longer mean cell residence time and maintaining higher dissolved oxygen are necessary for nitrifying system to achieve the reliable stability of nitrification in the combined treatment process, and the required mean cell residence time to maintain certain level of effluent ammonia depends on organic carbon concentration in the substrate . |
| 500 ## - GENERAL NOTE | |
| General note | A dissertation submitted in the partial fulfillment of the requirements for the degree of Doctor of Engineering, School of Environment, Resources and Development |
| 650 #0 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | Nitrification |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Hanaki, K., |
| Relator term | Chairperson |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Vigneswaran, Saravanamuthu, |
| Relator term | Co-Chairperson |
| 700 0# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Suphat Vongvisessomjai, |
| Relator term | Examination Committee |
| 700 0# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Chongrak Polprasert, |
| Relator term | Examination Committee |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Henze, M., |
| Relator term | Examination Committee |
| 710 2# - ADDED ENTRY--CORPORATE NAME | |
| Corporate name or jurisdiction name as entry element | Japan, |
| Relator term | Scholarship Donor |
| 810 2# - SERIES ADDED ENTRY--CORPORATE NAME | |
| Corporate name or jurisdiction name as entry element | Asian Institute of Technology. |
| Title of a work | Dissertation ; |
| Volume/sequential designation | no. EV-87-1 |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Materials specified | Full-Text |
| Uniform Resource Identifier | <a href="http://203.159.5.9/ait-thesis/detail.php?q=B18949">http://203.159.5.9/ait-thesis/detail.php?q=B18949</a> |
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| 998 ## - LOCAL CONTROL INFORMATION (RLIN) | |
| Operator's initials, OID (RLIN) | 2 |
| Cataloger's initials, CIN (RLIN) | 951012 |
| First date, FD (RLIN) | m |
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| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
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| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
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| Koha item type | 22-AIT Thesis (Replacement) |
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| Withdrawn status | Lost status | Damaged status | Not for loan | Home library | Current library | Shelving location | Date acquired | Total checkouts | Full call number | Barcode | Date last seen | Copy number | Price effective from | Koha item type |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | AIT Publications | 18/08/2026 | AIT Diss. no. EV-87-1 | 30050120726335 | 18/08/2026 | 3 | 18/08/2026 | 22-AIT Thesis (Replacement) | ||||
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | Archives | 18/08/2026 | AIT Diss. no. EV-87-1 | 30050160036512 | 18/08/2026 | 1 | 18/08/2026 | 40-Archives | ||||
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | AIT Publications | 18/08/2026 | AIT Diss. no. EV-87-1 | 30050121099948 | 18/08/2026 | 1 | 18/08/2026 | 20-AIT Publication | ||||
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | Archives | 18/08/2026 | AIT Diss. no. EV-87-1 | 30050121052228 | 18/08/2026 | 2 | 18/08/2026 | 40-Archives |