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Al-Attabi, AWN, Harris, C, Alkhaddar, R, Hashim, KS, Ortoneda-Pedrola, M and Phipps, D (2017) Improving sludge settleability by introducing an innovative, two-stage settling sequencing batch reactor. Journal of Water Process Engineering, 20. pp. 207-216. ISSN 2214-7144
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Abstract
Sludge settleability is considered one of the main drawbacks of sequencing batch reactors. The aim of this study therefore is to improve sludge settleability by introducing a novel, two-stage settling sequencing batch reactor (TSSBR) separated by an anoxic stage. The performance of the TSSBR was compared with that of a normal operating sequencing batch reactor (NOSBR), operating with the same cycle time. The results show a significant improvement in sludge settleability and nitrogen compound removal rates for the TSSBR over the NOSBR. The average removal efficiencies of NH3-N, NO3-N and NO2-N have been improved from 76.6%, 86.4% and 87.3% respectively for the NOSBR to 89.2%, 95.2% and 96% respectively for the TSSBR. In addition, the average SVI30 for the NOSBR has been reduced from 42.04 ml/g to 31.17 ml/g for the TSSBR. After three months of operation, there was an overgrowth of filamentous bacteria inside the NOSBR reactor, while the morphological characteristics of the sludge inside the TSSBR reactor indicated a better and homogenous growth of filamentous bacteria.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Filamentous bacteria; Nitrogen removal; Sequencing batch reactor; Sludge settleability; Wastewater treatment |
| Subjects: | T Technology > TD Environmental technology. Sanitary engineering |
| Divisions: | Civil Engineering & Built Environment Civil Engineering (merged with Built Env 10 Aug 20) |
| Publisher: | Elsevier |
| Date Deposited: | 07 Dec 2017 11:42 |
| Last Modified: | 04 Sep 2021 10:55 |
| DOI or ID number: | 10.1016/j.jwpe.2017.11.004 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/7679 |
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