Anammox-HAP颗粒污泥型膨胀床反应器的氮磷同步去除能力及污泥特性

Nitrogen and phosphorus removal capability of HAP-anammox granular sludge expanded bed reactor and sludge characteristics

为实现集成、高效的氮磷处理,提高厌氧氨氧化工艺的运行稳定性及功能集成性,搭建了一种新型的anammox-HAP颗粒污泥型膨胀床反应器。设置了3个不同温度条件下的反应器,通过控制进入反应器中的钙、磷元素,以及调控反应器pH,探究了膨胀床反应器对氮、磷的同步去除能力,并对污泥特性进行了分析。结果表明:anammox-HAP颗粒污泥型膨胀床反应器在35、25、15℃条件下均可稳定运行,并能分别实现(44.90±0.32)、(17.12±0.97)、(8.79±0.14)g·(L·d)^(-1)的氮去除速率,且总氮去除率稳定维持在85%以上;磷元素以HAP核的形式聚集在anammox颗粒内部,可在随剩余污泥排出的同时进行回收;anammox-HAP反应器中颗粒污泥的沉降性能明显高于一般厌氧或anammox工艺中的颗粒污泥,并与颗粒中的磷含量正相关。本研究阐释了anammox-HAP颗粒污泥型膨胀床反应器的特点,可为废水中氮磷的处理提供参考。

To achieve integrated and efficient nitrogen and phosphorus treatment with improved operational stability and functional integration of the anammox process,a new type of HAP-anammox granular sludge expanded bed reactor was developed.The experiment set up three reactors under different temperature conditions.By controlling the calcium and phosphorous elements in the input of the reactor and adjusting the pH,simultaneous removal of nitrogen and phosphorous in the expanded bed reactor was achieved.The results showed that HAP-anammox granular sludge expanded bed reactor can be operated with stabilized performance at 35℃,25℃,and 15℃,with the nitrogen removal rates of(44.90±0.32),(17.12±0.97),and(8.79±0.14)g·(L·d)^(-1),respectively.The total nitrogen removal rate was constantly maintained above 85%.The phosphorus element accumulates in the anammox granules as the core of HAP,which can be recovered from the excess sludge.The sedimentation performance of the granular sludge in the HAP-anammox reactor was remarkably higher than that of the conventional anammox granular sludge,and it was positively correlated with the phosphorus content in the granules.This study also characterized the HAP-anammox granular sludge expanded bed reactor,which can provide new insights for nitrogen and phosphorus removal in wastewater treatment.