有机物生物降解动力学极限浓度的影响因素

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。

Factors Affecting Kinetic Threshold Concentration of Biodegradation

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