The operational strategy of intermittent cycle extended aeration system in treating sewage
✍ Scribed by Jing-Song Chang; Ann-Cheng Chen; Mu-Ya Hung; Minliang Shih
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1999
- Tongue
- English
- Weight
- 98 KB
- Volume
- 74
- Category
- Article
- ISSN
- 0268-2575
No coin nor oath required. For personal study only.
✦ Synopsis
An Intermittent Cycle Extended Aeration System (ICEAS) offers advantages for treating sewage; such as easy operation, process ¯exibility, and low capital cost. A laboratory-scale study was made with synthetic-domestic wastewater (COD = 300 mg dm À3 ; BOD = 210 mg dm À3 ) to investigate appropriate conditions for reduced operating cost. The results from this study indicated that the maximum hydraulic loading and organic loading were 3.5 m 3 m À3 d À1 and 0.735 kg BOD m À3 d À1 respectively. The BOD and COD of ef¯uent were 15.5 mg dm À3 and 29.6 mg dm À3 for the cycle time and aeration time of 3.4 h and 2.65 h. It was not necessary to supply external arti®cial substrates in the reactor to deal with low wastewater ¯ow that caused the starvation of sludge. Speci®c oxygen uptake rate (SOUR) was used as the index of microbial activity. The study indicated that the microbial activity could be restored (SOUR = 20.5 mg g À1 MLVSS h À1 ) after 5±6 days of cultivation when the sludge was deprived of substrate for 17 days.