沸石粉基聚氨酯海绵在序批式生物膜反应器中去除氨氮废水性能探究

Performance of Zeolite Powder-Based Polyurethane Sponges for the Removal of Ammonia Nitrogen from Wastewater in a Sequencing Batch Biofilm Reactor

为了提高氨氮( )的去除率,本文研究了一种钠型有机改性沸石粉末填充聚氨酯海绵的新型生物膜载体(MBC)。结果表明,改性生物载体(MBC)的微生物固定量约为未改性聚氨酯海绵(BC)的两倍。填充MBC的序批式生物膜反应器(Z-SBBR)对化学需氧量(COD)的平均去除率比采用BC (S-SBBR)的高8.89%。Z-SBBR对氨氮( )和总氮(TN)的平均去除率比S-SBBR分别提高了5.18%和5.58%,出水TN和 的平均浓度分别为19.98 mg/L和13.67 mg/L。Z-SBBR中总磷(TP)的平均出水浓度也比S-SBBR低2.52 mg/L。通过微生物群落结构分析得知,MBC和BC中变形菌(Proteobacteria)、拟杆菌(Bacteroidetes)和放线菌(Actinomycetes)是主要优势菌群,而MBC中Proteobacteria数量较多。MBC不仅显示了更丰富的微生物多样性,也显示了更多的反硝化细菌。结果显示,改性后的生物膜载体对氨氮废水的去除性能有所提高。

A novel organic sodium-modified zeolite-filled polyurethane sponge biofilm carrier was developed in this study to improve ammonia nitrogen ( ) remov-al efficiency. The results showed that a modified biological carrier (MBC) had approximately twice the amount of microbial fixation compared with an unmodified polyurethane sponge (BC). The av-erage removal rate for chemical oxygen demand in a sequencing batch biofilm reactor (SBBR) using the MBC (the Z-SBBR) was 8.89% higher than in the SBBR using the BC (the S-SBBR). The average removal rates for and total nitrogen (TN) of the Z-SBBR were also 5.18% and 5.58% higher than those of using the BC in a sequencing batch biofilm reactor (the S-SBBR), while the av-erage concentrations of effluent TN and were 19.98 mg/L and 13.67 mg/L, respectively. The average effluent concentration of total phosphorus in the Z-SBBR was also 2.52 mg/L-lower than in the S-SBBR. By conducting a microbial community structure analysis, Proteobacteria, Bac-teroidetes and Actinomycetes were found to be the dominant bacteria in the MBC and BC, while the number of Proteobacteria was greater in the MBC. The MBC evidenced not only greater microbial diversity but also more denitrifying bacteria. Accordingly, the modified biofilm carrier had im-proved removal performance for ammonia wastewater.