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Effect of phosphorus on operation and characteristics of MBR

机译：磷对MBR运行和特性的影响

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摘要

The impact of phosphate-phosphorus loading on the biological characteristics and operational performance of a pilot-scale, aerobic membrane bioreactor (MBR) system was investigated. The system was operated to steady state under conditions of limited and excess phosphorus. The microbial population in the MBR was not effected substantially under either phosphorus condition and was highly effective in the oxidation and nitrification of a municipal strength, high protein, synthetic wastewater. Overall metabolic activity and some specific enzymes, particularly phosphotases, decreased significantly in the presence of excess phosphorus. Although more phosphorus was utilized by the microbial population when the feed phosphorus concentration was increased, degradation of the soluble organic compounds did not change significantly. After the increase of phosphorus in the bioreactor, the organic content of the effluent increased and stabilized at higher levels. Phosphorus spiking experiments showed that phosphorus adsorbed to the particulate phase of the sludge and caused an immediate increase in the concentration of organic compounds in the effluent. Excess phosphorus released organic matter of a size smaller than 0.1 mu m into the soluble phase of the bioreactor, resulting in the deterioration of the permeate. It was concluded that phosphorus is an important factor in the operation of an MBR, and excess amounts or shock loads reduce the effectiveness of the system.
机译：研究了磷-磷负载量对中试规模好氧膜生物反应器（MBR）系统的生物学特性和操作性能的影响。该系统在磷含量有限和过量的条件下运行至稳态。在两种磷条件下，MBR中的微生物种群均未受到实质影响，在市政强度高蛋白合成废水的氧化和硝化中非常有效。在过量磷的存在下，总体代谢活性和某些特定的酶（尤其是磷酸酶）显着降低。尽管当进料磷浓度增加时微生物种群利用了更多的磷，但是可溶性有机化合物的降解没有明显变化。生物反应器中的磷增加后，废水中的有机物含量增加并稳定在较高水平。掺磷实验表明，磷吸附到污泥的颗粒相中，并导致污水中有机化合物的浓度立即增加。过量的磷将小于0.1微米的有机物释放到生物反应器的可溶相中，导致渗透物变质。结论是磷是MBR操作的重要因素，过量或冲击负荷会降低系统的有效性。

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