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Bioresour Technol. 2015 Mar;179:187-192. doi: 10.1016/j.biortech.2014.12.024. Epub 2014 Dec 16.

Effect of algae growth on aerobic granulation and nutrients removal from synthetic wastewater by using sequencing batch reactors.

Author information

1
Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
2
Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan. Electronic address: lei.zhongfang.gu@u.tsukuba.ac.jp.
3
Graduate School of Environmental and Life Sciences, Okayama University, 3-1-1 Tushima-naka, Kita-ku, Okayama 700-8530, Japan.
4
Shanghai Biotechnology Corporation, 121 Libing Road, Shanghai 201203, China.

Abstract

The effect of algae growth on aerobic granulation and nutrients removal was studied in two identical sequencing batch reactors (SBRs). Sunlight exposure promoted the growth of algae in the SBR (Rs), forming an algal-bacterial symbiosis in aerobic granules. Compared to the control SBR (Rc), Rs had a slower granulation process with granules of loose structure and smaller particle size. Moreover, the specific oxygen uptake rate was significantly decreased for the granules from Rs with secretion of 25.7% and 22.5% less proteins and polysaccharides respectively in the extracellular polymeric substances. Although little impact was observed on chemical oxygen demand (COD) removal, algal-bacterial symbiosis deteriorated N and P removals, about 40.7-45.4% of total N and 44% of total P in Rs in contrast to 52.9-58.3% of TN and 90% of TP in Rc, respectively. In addition, the growth of algae altered the microbial community in Rs, especially unfavorable for Nitrospiraceae and Nitrosomonadaceae.

KEYWORDS:

Aerobic granules; Algae; Nitrification; Phosphorus removal; Sunlight

PMID:
25544496
DOI:
10.1016/j.biortech.2014.12.024
[Indexed for MEDLINE]

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