单级好氧除磷工艺与厌氧/好氧除磷工艺的对比研究

Comparison Study on Phosphorus Removal Between Single-stage Oxic Process and Anaerobic/Aerobic Process

以A/O工艺和单级好氧除磷工艺为研究对象,利用生活污水中存在最广泛的乙酸钠作为单一碳源,对比研究了2组SBR(A/O工艺,SBR1;单级好氧除磷工艺,SBR2)的除磷效果.连续进行3个月的研究表明,2组SBR在稳定除磷阶段的除磷率和单位污泥的除磷水平分别为91.72%和3.23 mg.g-1(SBR1)与71.70%和2.91 mg.g-1(SBR2).进一步研究还发现:在SBR1中PHA合成的同时伴随着糖原质的消耗,而在SBR2中PHA合成的同时伴随糖原质的积累,这意味着单级好氧除磷工艺中PHA的合成无需糖原质的参与;在静置阶段,2组SBR都表现出了很明显的释磷现象,但SBR2具有更高的释磷水平(释磷量分别为2.6 mg.L-1和13.28 mg.L-1).SBR1和SBR2体现出不同的除磷能力的原因很有可能是2组SBR的微生物在代谢过程中储能物质在消耗和存贮的循环过程中存在差异.

To compare the efficiency of phosphorus removal between anaerobic/aerobic process（SBR1） and single-stage oxic process（SBR2）,two SBRs were conducted using acetate as the sole carbon source which is the most extensive substrate in municipal wastewater.The results obtained from three months experiment showed that the phosphorus removal efficiency and the TP removed on a unit MLSS were 91.72%,3.23 mg·g-1（SBR1）and 71.70%,2.91 mg·g-1（SBR2） respectively during steady operation.The further study found that a significant increase of PHA associated with an decrease of glycogen in SBR1 while a significant synthesis of PHA increased with the accumulation of glycogen in SBR2,indicating glycogen was not essential for the synthesis of PHA in single-stage oxic process.Furthermore,obvious phosphorus release was observed in both SBRs during idle period,but the content of phosphorus released in SBR2（13.28 mg·L-1） was significantly higher than that in SBR1（2.6 mg·L-1）.The possible reason for SBR1 and SBR2 exhibited different phosphorus removal efficiencies was that microorganisms in both SBRs had different cyclic storage and consumption process of energy storages during metabolic process.