有机物生物降解动力学极限浓度的影响因素

Factors Affecting Kinetic Threshold Concentration of Biodegradation

有机物生物降解动力学极限浓度(Sm in)是有机污染物生物降解过程能够达到的最低浓度,在废水生物处理中具有重要意义。研究了生物降解极限浓度的影响因素,分别探讨了基质浓度、微生物培养方式、第二基质以及污泥驯化等对生物降解极限浓度的影响及其规律。结果表明:基质浓度越低,Sm in越小;连续培养的微生物其Sm in比间歇培养的低,连续方式更适合于降解微量化学物质的微生物的培养;第二碳源对极限浓度的影响与污泥驯化与否有关,驯化污泥加入第二碳源后降解速率下降,而未驯化污泥则相反。这为废水生物高度净化提供了理论和实验依据。

Threshold concentration（Smin）, as the lowest pollutant be achieved by biodegradation, is significant in wastewater biological （substrate） concentration that may treatment. Major factors affecting Smin were studied in this paper. Lowering the substrate concentration in the feed resulted in a lower Smin. Continuous culturing produced microorganisms capable of achieving a lower Smin, relative to that from batch culturing. The effect of supplemental carbon on Smin was dependent on the sludge acclimation; it enhanced degradation rate of non-acclimated system but reduced biodegradation rate of well acclimated system.