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Performance of autotrophic nitrogen removal from digested piggery wastewater

Authors :
Yunhui Lei
Yiqi Jiang
Yunhong Zhang
Dan Zheng
Lan Wang
Hongnan Yang
Liangwei Deng
Shuang Wang
Source :
Bioresource Technology. 241:465-472
Publication Year :
2017
Publisher :
Elsevier BV, 2017.

Abstract

The performance of an autotrophic nitrogen removal process to treat digested piggery wastewater (DPW) was investigated by gradually shortening the HRT and enhancing the DPW concentration during 390 days of operation. The results showed that the total nitrogen removal rate and efficiency reached 3.9 kg-N m −3 day −1 and 73%, which were significantly higher than the levels reported previously. A high relative abundance of Nitrosomonas (4.2%) and functional microbes (12.15%) resulted in a high aerobic ammonium oxidizing activity (1.25 ± 0.1 g-N g VSS −1 d −1 ), and a good settling ability (SVI, 78.42 mL g −1 SS) resulted in a high sludge concentration (VSS, 11.01 g L −1 ), which laid a solid foundation for the excellent performance. High-throughput pyrosequencing indicated that, compared with synthetic wastewater, the DPW decreased the relative abundances of every functional group of nitrogen removal microbes, and increased relative abundances of anaerobes (15.7%), sulfur-oxidizing bacteria (9.4%) and methanogens (40.8%).

Details

ISSN :
09608524
Volume :
241
Database :
OpenAIRE
Journal :
Bioresource Technology
Accession number :
edsair.doi.dedup.....ae93397fb456c35054fc0c97be6500bc