Long term operation of continuous-flow system with enhanced biological phosphorus removal granules at different COD loading

Dong Li; Yufeng Lv; Huiping Zeng; Jie Zhang

doi:10.1016/j.biortech.2016.06.022

Long term operation of continuous-flow system with enhanced biological phosphorus removal granules at different COD loading

Bioresour Technol. 2016 Sep:216:761-7. doi: 10.1016/j.biortech.2016.06.022. Epub 2016 Jun 7.

Authors

Dong Li¹, Yufeng Lv², Huiping Zeng², Jie Zhang³

Affiliations

¹ Key Laboratory of Water Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100123, China. Electronic address: lidong2006@bjut.edu.cn.
² Key Laboratory of Water Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100123, China.
³ Key Laboratory of Water Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100123, China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.

PMID: 27295254
DOI: 10.1016/j.biortech.2016.06.022

Abstract

In this study, a continuous-flow system with enhanced biological phosphorus removal (EBPR) granules was operated at different COD concentrations (200, 300 and 400mgL(-)(1)) to investigate the effect of COD loading on this system. The results showed that when the COD concentration in influent was increased to 400mgL(-)(1), the anaerobic COD removal efficiency and total phosphorus removal efficiency reduced obviously and the settling ability of granules deteriorated due to the proliferation of filamentous bacteria. Moreover, high COD loading inhibited the EPS secretion and destroyed the stability of granules. Results of high-through pyrosequencing indicated that filamentous bacteria had a competitive advantage over polyphosphate-accumulating organisms (PAOs) at high COD loading. The performance of system, settling ability of granules and proportion of PAOs gradually recovered to the initial level after the COD concentration was reduced to 200mgL(-)(1) on day 81.

Keywords: COD loading; Continuous-flow system; EBPR granules; High-throughput pyrosequencing; Recoverability.

MeSH terms

Bacteria / genetics
Biodegradation, Environmental
Biological Oxygen Demand Analysis*
High-Throughput Nucleotide Sequencing
Nitrogen / analysis
Phosphorus / isolation & purification*
Polysaccharides / analysis
Proteins / analysis
Rheology / methods*
Sewage / chemistry*
Temperature

Substances

Polysaccharides
Proteins
Sewage
Phosphorus
Nitrogen