Title: Post-treatment of anaerobically pre-treated molasses wastewater in an aerobic granular sludge sequencing batch reactor

Authors: Li-Li Zhang, Jian-Meng Chen, Wei-Min Cai

Addresses: School of Biological and Environmental Engineering, Zhejiang University of Technology, No. 6 District, Zhaohui, Hangzhou 310032, China. ' School of Biological and Environmental Engineering, Zhejiang University of Technology, No. 6 District, Zhaohui, Hangzhou 310032, China. ' School of Environmental Science and Engineering, Shanghai Jiaotong University, 800 Dongchuan Avenue, Shanghai 200240, China

Abstract: An aerobic granular sludge system was used for post-treatment of an Up-Flow Anaerobic Sludge Blanket (UASB) reactor treating molasses wastewater. The system was very effective in the treatment of the UASB reactor effluent. Up to 94.9-96.0% COD removals could be observed and it showed no signs of serious stress when subjected to high COD loads of 7.9 g l⁻¹d⁻¹. The total nitrogen removals were in excess of 80.2% with the maximum ammonia-N loads up to 0.6 g l⁻¹d⁻¹. For Suspended Solids (SS), the removal efficiencies ranged between −320.4% and 84.8% in different operating periods. The aerobic granules with excellent settleability promoted high solid retention and low solid washout in the reactor.

Keywords: aerobic granular sludge; post-treatment; UASB reactor effluent; BOD5; COD removal; ammonia-nitrogen removal; suspended solids; aerobic granulation; molasses wastewater; wastewater treatment; up-flow anaerobic sludge blanket; sequencing batch reactors; nitrogen removal.

DOI: 10.1504/IJEWM.2011.037369

International Journal of Environment and Waste Management, 2011 Vol.7 No.1/2, pp.90 - 102

Published online: 24 Jan 2015 *

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