Treatment of rich ammonia nitrogen wastewater with polyvinyl alcohol immobilized nitrifier biofortified constructed wetlands

Wei Wang, Yi Ding, Yuhui Wang, Xinshan Song, Richard F. Ambrose, Jeffrey L. Ullman, Brandon K. Winfrey, Junfeng Wang, Juan Gong

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24 Citations (Scopus)

Abstract

Polyvinyl alcohol (PVA) immobilized nitrifier was adopted to enhance the treatment of wastewater containing rich ammonia nitrogen (NH4-N) in constructed wetlands (CWs). NH4-N removal in immobilized nitrifier biofortified constructed wetlands (INB-CWs) was positively correlated with the dosage of PVA pellets. INB-CWs planted with Canna indica L. exhibited removal efficiencies of 46% NH4-N, 43% total nitrogen and 65% COD, which are significant higher than control. INB-CWs outperformed the unplanted and non-immobilized constructed wetland or nitrifier suspension system. The ideal reaction conditions for treating synthetic wastewater containing 200 mg L-1 NH4-N were obtained as follows: pH, 8.5; dissolved oxygen, 4.0 mg L-1; temperature, 30 °C and PVA pellets dosage, 60 g L-1. In addition, degradation of PVA pellets accelerated nitrification. Results indicated that the PVA immobilized nitrifier had great potential applications for treating wastewater containing rich ammonia nitrogen in CWs.

Original languageEnglish
Pages (from-to)7-11
Number of pages5
JournalEcological Engineering
Volume94
DOIs
Publication statusPublished - 1 Sep 2016
Externally publishedYes

Keywords

  • Biofortification
  • Constructed wetlands
  • Immobilized pellets
  • Nitrification
  • Rich ammonia nitrogen

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