4.8 Article

Effects of salinity on the denitrification efficiency and community structure of a combined partial nitritation-anaerobic ammonium oxidation process

Journal

BIORESOURCE TECHNOLOGY
Volume 249, Issue -, Pages 550-556

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.10.037

Keywords

Combined partial nitration (PN)-anaerobic ammonium oxidation (Anammox) process; Salinity; Inhibition and recoverability; 16S rRNA gene high-throughput sequencing; Microbial community

Funding

  1. National Key Research and Development Programme of China [2016YFC 0401103]
  2. National Natural Science Foundation of China [51408387, 51478284]
  3. Second Phase Program for Advantageous Characteristic Subject of Jiangsu Province
  4. Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment
  5. Suzhou Key Lab of Separation and Purification Materials Technologies [SZS201512]

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The effects of salinity changes on nitrogen transformation efficiency and recoverability were studied by using a partial nitration (PN)-anaerobic ammonium oxidation (Anammox) integrated reactor. The changes of microbial community structure and population abundance during the increase and decrease of salinity were also analyzed by 16S rRNA gene high-throughput sequencing. The results showed that when the salinity was increased to 1.35%, the combined PN-Anammox process achieved the maximum stimulated and total nitrogen removal rate (TNRR) arrived at 1.1 kg/(m(3).d). When the salinity was higher than 1.35%, the activities of AOB and Anammox bacteria began to be inhibited. When the salinity reached 2.4%, the TNRR decreased to 60%. TNRR was fast restored, when salinity was reduced to 0.11%. The genes of AOB and Anammox bacteria indicated that the TNRR of the reactor was restored after salinity inhibition, but the functional microbial community structure and abundance had relatively large, irreversible changes.

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