A new process for simultaneous nitrogen removal and phosphorus recovery using an anammox expanded bed reactor

Bioresource Technology
Haiyuan MaYu-You Li

Abstract

Phosphorus recovery from wastewater is an important approach for sustainable phosphorus use. In this work, a process combining anammox and hydroxyapatite (HAP) precipitation in an expanded bed reactor for simultaneous nitrogen removal and phosphorus recovery was developed by applying specific Ca/P ratio and pH control. A high phosphorus removal rate (0.14 ± 0.01 kg-P/m3/d) was obtained while a stable nitrogen removal efficiency (87.4 ± 2.9%) maintained with an effluent recirculation system applied. Average 13.4% phosphorus (30.7% in P2O5) accumulation in the dry sludge and a Ca/P ratio very close to HAP was observed by quantitative elemental analysis. In this work, different analysis revealed the two layers structure with anammox biofilm attached to inorganic core of the granules. Different spectral analysis determined the major phase of the inorganic content as hydroxyapatite. With proper Ca/P ratio and pH control, anammox expanded bed reactor was transformed into an efficient process to simultaneously remove nitrogen and recover phosphorus.

Citations

Apr 27, 2019·Environmental Science and Pollution Research International·Qing WangYinguang Chen
Nov 24, 2020·The Science of the Total Environment·Vedran VučićSusanne Günther
Mar 16, 2021·Engineering in Life Sciences·Vedran Vučić, Susann Müller
May 4, 2020·The Science of the Total Environment·Xinying ZhangQiaoying Wang

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