AI SearchThe application of constant recycle solids concentration in the activated sludge process (Record no. 6527)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 04151nam a2200409 4500 |
| 005 - DATE AND TIME OF LATEST TRANSACTION | |
| control field | 20260817162845.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 140198 th eng |
| 035 ## - SYSTEM CONTROL NUMBER | |
| System control number | .b10676831 |
| 099 #9 - LOCAL FREE-TEXT CALL NUMBER (OCLC) | |
| Classification number | AIT Thesis no. 819 |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Bonotan-Dura, F. M. |
| 245 14 - TITLE STATEMENT | |
| Title | The application of constant recycle solids concentration in the activated sludge process |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. | |
| Place of publication, distribution, etc. | Bangkok : |
| Name of publisher, distributor, etc. | Asian Institute of Technology, |
| Date of publication, distribution, etc. | 1975 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 71 p. |
| 490 1# - SERIES STATEMENT | |
| Series statement | Thesis ; |
| Volume/sequential designation | no. 819 |
| 500 ## - GENERAL NOTE | |
| General note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand. |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | Thesis (M.Eng.) - Asian Institute of Technology, 1975 |
| 520 ## - SUMMARY, ETC. | |
| Summary, etc. | The applicability of the new model (GAUDY 'S MODEL) for completely mixed activated sludge treatment holding the recycle solids concentration as a system constant was investigated using an actual industrial organic wastewater. Short-term experiments were conducted at various dilution rates (1/8, 1/6, 1/4, 1/2, 1/1.5 hr-1 ) for two recycle solids concentration values (5,000 and 7,000 mg/l). The influent substrate concentration was maintained at 1,000 mg/l COD and the hydraulic recycle ratio, a, at 0.3.The reactor biological solids and effluent COD were observed to remain quite steady lending an experimental basis t o the assumption of steady state in the model. High COD removals (for example, 80% compared with 20% for once-through system at a dilution rate of 1/2 hr-1 ) highlighted this mode of operation, The maximum specific growth rate (um) of the heterogeneous microbial population was found to be nearly the same as that for the once-through system. To evaluate the predictability of the new model, the "Monad" parameter m, the saturation constant (K8 ), and the yield coefficient (Y) are used. For ECKENFELDER's Model, values of the substrate removal rate constant (K), mass yield rate coefficient (a), endogenous respiration rate coefficient (b) and the biodegradable fraction of the volatile suspended solids (x) need to be known; for McKINNEY's Model, the metabolism constant (KM), synthesis factor (Ks) and endogenous factor (Ke) have to be evaluated. The term x in ECKENFELDER's formula is still being refuted; the term K is empirical. Evaluation of McKINNEY 's constant is still being investigated. Of the three models, only GAUDY's model is closely tied to the accepted principles of microbial growth. At the range of dilution rates of engineering significance (D < 0.5 hr-1 ), GAUDY's model has been shown to provide higher predictability than ECKENFELDER's or McKINNEY's model. At higher dilution rates (D > 0.5 hr-1 ) wherein the biological solids are being washed out; GAUDY 's model loses its predictive value. Furthermore, at this range, the assumption of negligible substrate concentration in the recycle no longer holds true. The optimum dilution rate for a constant recycle solids concentration between 5,000 to 7,000 mg/l has been found to be 1/4 hr-1 (a reactor detention time of only 3.1 hours). |
| 650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | Water |
| General subdivision | Purification |
| 650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | Sewage |
| General subdivision | Purification |
| -- | Activated sludge process |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Yang, Yi Ping, |
| Relator term | Chairperson |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Pescod, M.B., |
| Relator term | Examination Committee |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Nguyen Cong Thanh, |
| Relator term | Examination Committee |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Htun, Maung Nay, |
| Relator term | Examination Committee |
| 710 2# - ADDED ENTRY--CORPORATE NAME | |
| Corporate name or jurisdiction name as entry element | Government of the United Kingdom, |
| 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 | Thesis ; |
| Volume/sequential designation | no. 819 |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Materials specified | Full-Text |
| Uniform Resource Identifier | <a href="http://203.159.5.9/ait-thesis/detail.php?q=B24063">http://203.159.5.9/ait-thesis/detail.php?q=B24063</a> |
| 907 ## - LOCAL DATA ELEMENT G, LDG (RLIN) | |
| a | .b10676831 |
| b | mnait |
| c | x |
| 902 ## - LOCAL DATA ELEMENT B, LDB (RLIN) | |
| a | 260511 |
| 998 ## - LOCAL CONTROL INFORMATION (RLIN) | |
| Operator's initials, OID (RLIN) | 2 |
| Cataloger's initials, CIN (RLIN) | 951012 |
| First date, FD (RLIN) | m |
| -- | a |
| -- | x |
| -- | 4 |
| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
| l | mnait |
| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
| l | mnarc |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | 20-AIT Publication |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | 40-Archives |
| 909 ## - LOCAL ITEMS USED | |
| Barcode | Barcode : 30050003036463 |
| CREATED | CREATED : 1995-10-16 |
| RECORD Id | RECORD # : i10870817 |
| LPATRON | LPATRON : 0 |
| LCHKIN | LCHKIN : - |
| RENEWALS | # RENEWALS : 0 |
| -- | # OVERDUE : 0 |
| -- | IUSE3 : 0 |
| -- | TOT CHKOUT : 0 |
| -- | TOT RENEW : 0 |
| 909 ## - LOCAL ITEMS USED | |
| Barcode | Barcode : 30050160092051 |
| CREATED | CREATED : 2016-04-22 |
| RECORD Id | RECORD # : i12951547 |
| LPATRON | LPATRON : 0 |
| LCHKIN | LCHKIN : - |
| RENEWALS | # RENEWALS : 0 |
| -- | # OVERDUE : 0 |
| -- | IUSE3 : 0 |
| -- | TOT CHKOUT : 0 |
| -- | TOT RENEW : 0 |
| 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 | 17/08/2026 | AIT Thesis no. 819 | 30050003036463 | 17/08/2026 | 1 | 17/08/2026 | 20-AIT Publication | ||||
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | Archives | 17/08/2026 | AIT Thesis no. 819 | 30050160092051 | 17/08/2026 | 17/08/2026 | 40-Archives |