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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Chon, Dong-Hyun Rome, McNamara Kim, Hee-Sik Park, Chul |
| Description | Country affiliation: United States Author Affiliation: Chon DH ( Department of Civil and Environmental Engineering, University of Massachusetts, Amherst, MA 01003, USA. dhchon@yahoo.com) |
| Abstract | To investigate the mechanism of sludge reduction in activated sludge (AS) with an anaerobic side-stream reactor (ASSR), four AS systems with different digestion schemes were operated in the laboratory. The four systems are: a) AS+ASSR; b) AS+aerobic digester; c) AS+anaerobic digester; and d) AS with no solids wastage. The average sludge yield of AS+ASSR from two phases was 0.14 mgVSS/mgCOD, which is 22-54% less than that from the three other systems. The accounting of biomass in AS+ASSR system revealed that 50% of sludge is degraded in ASSR while the other half is degraded in the aeration basin. Furthermore, both whole sludge and centrate from ASSR led to a significant oxygen uptake in AS, indicating the importance of aerobic biodegradation in AS+ASSR system. The extracellular polymeric substances (EPS) data showed that base-extractable EPS was much smaller for AS with ASSR than with no wastage. In contrast, cation exchange resin-EPS was similar for both systems. These results indicate that degradation of base-extractable EPS accounts for the lower sludge yield in AS+ASSR, and based on the literature this organic pool is believed to be aluminium and/or iron-bound EPS. The microbial profile data suggests that recirculation in AS+ASSR selects some unique microorganisms. Further research is warranted to study their role in sludge reduction. |
| File Format | HTM / HTML |
| ISSN | 02731223 |
| Issue Number | 1 |
| Journal | Water Science & Technology |
| Volume Number | 63 |
| e-ISSN | 19969732 |
| Language | English |
| Publisher | IWA Publishing |
| Publisher Date | 2011-01-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Subscribed |
| Subject Keyword | Discipline Hydrology Sewage Anaerobiosis Electrophoresis, Polyacrylamide Gel Oxygen Chemistry Polymerase Chain Reaction Water Microbiology Journal Article |
| Content Type | Text |
| Resource Type | Article |
| Subject | Environmental Engineering Water Science and Technology |
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