Highly efficient and low-energy nitrogen removal of sludge reduction liquid by coupling denitrification- partial nitrification-Anammox in an innovative auto-recycling integration device with different partitions

Xiang Li; Xin-Wei Tan; Yan Yuan; Yong Huang; Bo-Lin Li; Run Jin

doi:10.1016/j.biortech.2020.122880

Highly efficient and low-energy nitrogen removal of sludge reduction liquid by coupling denitrification- partial nitrification-Anammox in an innovative auto-recycling integration device with different partitions

Bioresour Technol. 2020 Apr:302:122880. doi: 10.1016/j.biortech.2020.122880. Epub 2020 Jan 23.

Authors

Xiang Li¹, Xin-Wei Tan², Yan Yuan², Yong Huang², Bo-Lin Li³, Run Jin²

Affiliations

¹ School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China; National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology, Suzhou 215009, China. Electronic address: lixiang@mail.usts.edu.cn.
² School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China; National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology, Suzhou 215009, China.
³ School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, Hubei 430070, China.

PMID: 32007855
DOI: 10.1016/j.biortech.2020.122880

Abstract

The denitrification (DN), partial nitrification (PN) and Anammox processes were coupled in an auto-recycling integration device to remove nitrogen from the supernatant of sludge reduction pretreatment. The nitrogen removal performance of the device and the effect of organic matter concentration on the nitrogen transformation were discussed. The results showed that DN, PN and Anammox are well coupled and total nitrogen (TN) removal rate reached 0.85 kg/(m³·d). The pre-DN process can achieve the removal of NO₃^--N produced by the back-end PN-Anammox process without the need of reflux pump drive. When the influent NH₄⁺-N concentration was approximately 400 mg/L, the effluent TN concentration was less than 20 mg/L. The fluctuation of organic matter led to changes of nitrogen transformation in the system, and the best ratio of influent CODbio/TN was 0.7-0.9. Nitrosomonas and Candidatus Brocadia played important roles in the nitrogen removal process as the main functional microorganisms of PN and Anammox, respectively.

Keywords: Auto-recycling device; DN-PN-Anammox process; Low-energy; Nitrogen removal; Sludge reduction liquid.

MeSH terms

Bioreactors
Denitrification*
Nitrification*
Nitrogen
Oxidation-Reduction
Sewage

Substances

Sewage
Nitrogen