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Improving sludge settleability by introducing an innovative, two-stage settling sequencing batch reactor

Al-Attabi, AWN and Harris, C and Alkhaddar, R and Hashim, KS and 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: Built Environment
Civil Engineering
Publisher: Elsevier
Date Deposited: 07 Dec 2017 11:42
Last Modified: 07 Dec 2017 11:42
DOI or Identification number: 10.1016/j.jwpe.2017.11.004
URI: http://researchonline.ljmu.ac.uk/id/eprint/7679

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