用快速生物活性测定仪测定活性污泥生物活性的研究

基于快速生物活性测定仪,对污水处理厂好氧生物处理单元的重要运行指标--污泥活性的长期变化、酸碱性、温度、毒性等外部环境条件对污泥活性的影响进行了测定与研究.结果表明,长期运行的活性参数变化幅度在20%以内;pH值偏离正常值时,生物活性有不同程度的下降,但对酸性环境的耐受能力远大于对碱性环境的耐受能力;温度升高,污泥的活性增强,温度超过42.5℃后,污泥活性遭到强烈抑制,但内源呼吸速率受温度的影响不明显;毒性物质对生物活性有很强的抑制作用,而且抑制可能是有选择性的.最后还测量了一个实际污水处理厂的污泥活性,标准偏差在20%以内.这表明,污泥活性测定结果较稳定,所测量的活性参数能够表征污泥的活性状态.

Study on the Biological Activity of Activated Sludge Using a Rapid Biological Activity Tester

Based on a Rapid Biological Activity Tester (RBAT), a study was taken on the sludge activity which is one of the most important parameters in the operation of aerated biological treating unit in WWTP to measure the effect of the external environmental conditions on the sludge activity, such as acidity and alkalinity, temperature, toxicity, etc. It is observed that the variety of the activity parameters is limited in 20% for a long time. While pH is deviated from the normal value, the biological activity drops to some degree, and furthermore, the ability of the microorganism to endure the acerbic environment is much higher than that to endure the alkaline environment. Temperature increase can result in the enhancement of the biological activity, and if the temperature is higher than 42.5 degrees C, the biological activity is greatly inhibite, but the endogenous respiring rate is less influenced by high temperature. Toxicity can greatly inhibit the biological activity of the activated sludge, and the inhibition is probably selective. Finally, the biological activity of the activated sludge from a real wastewater treatment plant was tested, and the standard deviation of the result is less than 20%. The results indicate that the RBAT is a promising method to measure biological activity, and the characteristics of activated sludge can be well expressed.