Understanding the impact of influent nitrogen concentration on granule size and microbial community in a granule-based enhanced biological phosphorus removal system.

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 Technol

journal_title

Bioresource technology

authors

Zou J,Li Y,Zhang L,Wang R,Sun J

doi

10.1016/j.biortech.2014.11.093

subject

Has Abstract

pub_date

2015-02-01 00:00:00

pages

209-16

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(14)01707-6

journal_volume

177

pub_type

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