Process optimization of anammox-driven hydroxyapatite crystallization for simultaneous nitrogen removal and phosphorus recovery

Research output: Contribution to journalArticle


Based on the requirements for advanced treatment and resource recovery of nitrogen and phosphorus pollutants in wastewater, the coupled anammox and hydroxyapatite crystallization (anammox-HAP) process was studied with an aim of achieving high efficiency and low energy consumption during simultaneous nitrogen and phosphorus removal. In the long-term experiments and batch tests, the effects of substrate conditions (nitrogen and phosphorus load, calcium concentration, etc.) on the nitrogen removal and phosphorus recovery efficiencies were investigated. The granular structure and crystal properties were analyzed together with microscopic characterization methods, and the formation mechanism of coupled anammox-HAP granules was verified. Based on these experiments, a theoretical model and technical method for realizing the coupled process were established, and a reference for practical engineering application was provided.


  • Lan Lin
  • Yanlong Zhang
  • Markus Beckman
  • Wenzhi Cao
  • Tong Ouyang
  • Shaopo Wang
  • Yu You Li
External organisations
  • Xiamen University
  • Lund University
  • Tohoku University
  • Tianjin Chengjian University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Other Materials Engineering


  • Anammox, Ca/P ratio, Free HAP, Hydroxyapatite crystallization, Nitrogen removal, Phosphorus recovery
Original languageEnglish
Article number121779
JournalBioresource Technology
Publication statusPublished - 2019 Oct
Publication categoryResearch
Externally publishedYes