Full text
| |
| Author(s): |
Gustavo Henrique Ribeiro da Silva
Total Authors: 1
|
| Document type: | Master's Dissertation |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Civil |
| Defense date: | 2001-12-21 |
| Examining board members: |
Edson Aparecido Abdul Nour;
José Roberto Guimarães;
Silvia Claudia Semensato Povinelli
|
| Advisor: | Edson Aparecido Abdul Nour |
| Abstract | |
The present research aimed to study an alternative route for union of aerobic and anaerobic processes, through the use of a baffled reactor, treating sanitary wastewater. The reactor is composed of four sequential chambers, being the first tree anaerobic chambers and the last one aerobic, composing a total volume of approximately 2.5 m3. The sludge generated in the reactor is separated in a laminar sedimentation tank and recycled into the forth chamber. The reactor - placed in a wastewater treating plan of Limeira city, S. P., 8razil -operated in a period of 444 days. This period was divided in five phases, with hydraulic detention times (HOT) varying from 7 to 16 hours. The reactor was fed with sanitary wastewater which had already suffered a preliminary treatment. The five phases of operation corresponded to 10, 16, 12,8 e 7 hours of HOT, respectively. The pH values in all chambers and in the sedimentation tank, varied between 5,7 e 8,3, with a mean value of 6,8; the correction of pH values was not necessary during all periods. The best value of 8005 removal was attained in the Phase 4 (HOT=8 hours), 56,9 to 95,7%. However, the statistic comparison of the means .of two samples showed that there was no significant difference between the phases, except in Phase 2, with P=0,05. The reactor performance, in relation to COOtotal removal and TSS, was similar to that obtained for the 8005, with values of 31,4 to 95,6 and 21,0 to 97,3%, respectively. The same occurred in the statistic test. In chamber 4, the oxygen dissolved values were satisfactory in most of the periods, reaching the maximum of 4,7 and of 0,0 mg 02.L-1. The laminar sedimentation tank was important for removal of solids produced in the sedimentation tank. After the 10ih operation day, the recycled sludge presented a sedimentation capability classified between good and very good. Thus, It is possible to affirm that the baffled reactor configuration of the present work promotes an useful effluent treatment, employed to the production of an aerobic sludge with easy management (AU) | |