Abstract:
:To better understand the effect of influent nitrogen concentration on granule size and microbial community in a granule-based enhanced biological phosphorus removal system, three influent nitrogen concentrations were tested while carbon concentration was an unlimited factor. The results show that although ammonium and phosphate were well removed in the tested nitrogen concentration range (20-50 mg L(-1)), granule size, the amount of phosphate accumulating organisms (PAOs) and microbial activity were affected significantly. A possible mechanism for the effect of influent nitrogen concentration on granule size is proposed based on the experimental results. The increase in proteins/polysaccharides ratio caused by high influent nitrogen concentration plays a crucial role in granule breakage. The small granule size then weakens simultaneous nitrification-denitrification, which further causes higher nitrate concentration in the effluent and lower amount of PAOs in sludge. Consequently, phosphate concentration in the anaerobic phase decreases, which plays the secondary role in granule breakage.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Zou J,Li Y,Zhang L,Wang R,Sun Jdoi
10.1016/j.biortech.2014.11.093subject
Has Abstractpub_date
2015-02-01 00:00:00pages
209-16eissn
0960-8524issn
1873-2976pii
S0960-8524(14)01707-6journal_volume
177pub_type
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