液相化学处理MBBR填料对城市污水厂尾水深度脱氮的影响

摘要

To improve the nitrate removal ability of the polythene ( PE) carriers in the moving bed biofilm reactors ( MBBR) , the liquid-phase chemical method was used to modify the PE carriers and the ability of advanced nitrogen removal denitrification of the modified PE ( MPE) carriers also studied extensively. The results showed that the static contact angle of the MPE surface was 75. 5° which decreased by 26. 6% compared with that of PE. The MPE surface structure roughness was higher than that of PE through the scanning electron microscopy ( SEM ) observation, and the oxygen element content of MPE was increased and the surface structure was changed compared with PE using the energy dispersive spectra and IR spectra analysis. The denitrification ability of MPE MBBR was improved obviously compared with PE MBBR. When the influent NO3--N and TN of MPE MBBR were (8. 5 ± 1. 5) mg∕L and (14. 3 ± 2. 1) mg∕L, the NO3--N and TN removal were (75. 2 ± 7. 0)% and (56. 5 ± 10. 7)%, respectively, which were increased 20. 8% and 58. 1% compared with the PE MBBR accordingly.%为进一步提高移动床生物膜反应器( MBBR)中普通聚乙烯( PE)填料对城市污水处理厂尾水中NO3--N的去除能力,采用液相化学处理法对PE进行改性,并对其反硝化深度脱氮效能进行研究。结果表明：改性聚乙烯( MPE)填料的静态接触角为75．5°,与PE相比降低了26．6%；扫描电镜显示,MPE与PE相比表面结构粗糙度增强；能谱及红外光谱分析表明,MPE表面氧元素含量及结构都发生了变化；MPE填料的MBBR反硝化能力与PE相比得到了明显提高,当进水NO3--N和TN浓度分别为(8．5±1．5)和(14．3±2．1) mg∕L时,MPE填料的MBBR对NO3--N和TN的平均去除率分别为(75．2±7．0)%和(56．5±10．7)%,与PE相比分别提高了20．8%和58．1%。