LüJi-teng,WUShu-yun,LIULu-wen,et al.Performance of Filter Packed with Composite Media Consisting of Iron Shavings Coupled with Loofah for Nitrogen and Phosphorus Removal[J].China Water & Wastewater,2023,39(19):89-94.
耦合铁刨花和丝瓜络的复合填料滤池脱氮除磷效能
- Title:
- Performance of Filter Packed with Composite Media Consisting of Iron Shavings Coupled with Loofah for Nitrogen and Phosphorus Removal
- 摘要:
- 采用废弃的铁刨花、丝瓜络和聚氨酯作为滤池的复合填料进行脱氮除磷，研究其在深度处理工艺中的机理和功效。在进水无碳源、总氮为16~22 mg/L、总磷为1~1.6 mg/L，以及水力停留时间为1~2 h的条件下，滤池对总氮和总磷的平均去除率分别为32.1%和50.2%，平均反硝化速率为89 mg/（L·d）。通过对铁刨花产生的沉积物进行X射线衍射（XRD）和X射线荧光光谱（XRF）分析，以及丝瓜络浸出实验结果表明，铁刨花层进行微电解反应除磷，同时消耗溶解氧，有利于丝瓜络层进行反硝化作用；丝瓜络层提供反硝化所需的缓释碳源进行脱氮；聚氨酯层消耗多余的碳源。这种多介质复合填料的耦合协同脱氮除磷技术，为污水深度处理提供了一种新思路。
- Abstract:
- This study investigated the mechanism and performance of an advanced treatment process—filter packed with waste iron shavings, loofah and polyurethane for nitrogen and phosphorus removal. When there was no organic carbon source in influent, TN concentration was 16-22 mg/L, TP concentration was 1-1.6 mg/L, and the hydraulic retention time (HRT) was 1-2 h, the filter demonstrated average removal rates of 32.1% and 50.2% for TN and TP, and average denitrification rate of 89 mg/(L·d). The results of X-ray diffraction (XRD) and X-ray fluorescence (XRF) analysis of the deposits produced by iron shavings and the loofah leaching experiment showed that the simultaneous removal of phosphorus and consumption of dissolved oxygen by micro-electrolysis in the iron shavings layer were conducive to the denitrification of the loofah layer. The loofah layer provided slow-release carbon sources required for denitrification, and the excess carbon sources were consumed by the polyurethane layer. The coupling and synergistic nitrogen and phosphorus removal technology packed with multiple composite media provided a new idea for the advanced treatment of wastewater.
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