污泥消化液的磷浓度对anammox-HAP系统磷回收的影响

厌氧氨氧化-羟基磷酸钙(anammox-hydroxyapatite, anammox-HAP)技术可实现污泥厌氧消化液高效自养脱氮同步磷回收。污泥厌氧消化液中磷的浓度与污泥性质、厌氧消化过程相关，变化范围很大。为探索anammox-HAP系统中的磷回收效率，通过基于anammox-HAP长期运行的膨胀颗粒污泥床反应器，考察了不同进水磷浓度、pH和钙磷质量比（Ca/P）对磷回收效率及污泥特性的影响。结果表明：进水磷浓度在40~250 mg·L⁻¹时，膨胀颗粒污泥床反应器脱氮性能稳定，总氮去除率可达88.5%；磷回收效率与进水磷浓度、反应器内pH及进水Ca/P密切相关，磷回收效率最高为89.7%；高磷浓度下形成的颗粒污泥，有望实现高效的磷资源利用。本研究可为利用anammox-HAP系统实现磷回收提供参考。

Effect of phosphorus concentration in sludge digestion liquid on phosphorus recovery by anammox-HAP

Anammox-hydroxyapatite (anammox-HAP) process was developed to effectively remove nitrogen and recover phosphorus at the same time from municipal sludge digestion liquid. However, phosphorus concentration in sludge digestion liquid varies greatly with the characteristics of sludge and the digestion process. In this study, the effects of different influent phosphorus concentration, pH value and calcium phosphorus ratio on phosphorus recovery efficiency and granular sludge characteristics were investigated through long-term operation of a continuous flow expanded granular sludge bed (EGSB) reactor. Results showed that the nitrogen removal performance of the continuous flow EGSB reactor was stable when the influent phosphorus concentration is in the range of 40~250 mg·L−1, and the average total nitrogen removal rate of the reactor reached 88.5%. The recovery efficiency of phosphorus was closely correlated with the influent concentration of phosphorus, the pH value in the reactor and the ratio of calcium to phosphorus. The maximum recovery efficiency of phosphorus was up to 89.7%. Granular sludge formed under high phosphorus concentration is expected to realize efficient recovery of phosphorus. This study can provide reference for phosphorus recovery using the anammox-HAP system.