呼吸图谱表征活性污泥微生物的休眠与流失

Indication of Dormancy and Loss of Activated Sludge Microorganisms Using Respirogram

通过试验模拟污水厂低温条件,研究了温度降低过程中出水水质和活性污泥呼吸图谱的变化规律。结果表明,有机物去除和脱氮效果明显恶化的临界温度分别为8℃和10℃;系统经过短暂低温冲击后恢复至原温度运行,微生物活性和污水处理能力可快速恢复。当标准条件下OUR未发生明显变化而现场条件下OUR减小时,表明微生物进入休眠状态,且现场条件与标准条件下的OUR差值越大,进入休眠状态的微生物数量越多,此时升高温度可快速激活微生物的活性。当标准条件下OUR明显减小时,表明微生物出现流失。该研究提供了一种利用呼吸图谱判别微生物休眠与流失的简便方法,为污水厂在越冬期的水质安全保障提供了理论基础。

The changes of effluent quality and activated sludge respirogram were studied during the process of temperature reduction by simulating the low temperature condition of the sewage plant. The results showed that the critical temperature for the removal efficiency of organic matter and nitrogen were 8℃ and 10 ℃, respectively. The system was restored to the original temperature operation after a brief low temperature impact, and microbial activity and sewage treatment capacity could also be quickly restored. When the field condition OUR decreased and the standard condition OUR did not change obviously, it in- dicated that the microorganism was in a dormant state, and the greater the OUR difference between the field condition and the standard condition, the more the microorganisms entered the dormant state. At this time, the increasing temperature could activate the activity of microorganism rapidly. When the standard condition OUR significantly reduced, indicating the loss of microorganisms. This study provides a simple method for discriminating dormancy and loss of microorganisms by respirogram, which provides a theoretical basis for the safety of water quality of the wastewater treatment plant in winter.