Applied Research Of Micro-nano Bubble Aerationt In Sewage Treatment

The main content of this paper is to compare the micro-nano bubble aeration and thetraditional aeration(bottom aeration), dealing with the domestic sewage, carried on thedifferent devices. Then observing and analyzing the results and make comparisonthrough economic analysis. Besides, it also explores the possibility of micro-nanobubble aeration combined with ozone.1. In the small sewage treatment process of A2O,we successively used the micro-nanobubble aeration and the bottom aeration in the aerobic aeration. And the results showedthat the removal rates of SS，CODcr，NH3-N，TP and TN coming from micro-nanobubble technology were7.3%、10.2%、12.4%、11.5%and11.2%higher than those fromthe conventional aeration technology, respectively. Additionally, through the economicanalysis, the energy consumption created by the micro-nano bubble technology waslower than that from bottom aeration technology when dealing with the same amount ofsewage.2. When the air temperature of outside became lower than10℃, the removal rates ofpollutants in domestic sewage would be reduced in both two kinds of devices(bottomaeration adopted in aerobic zone).Especially for the degradation of NH3-N,whichfundamentally could not achieve the standards for pollutants discharge of the sewagetreatment plants. But the removal efficiency of NH3-N could increase obviously if wechanged the aeration way into micro-nano bubble aeration technology so that it couldachieve the standards for pollutants discharge of the sewage treatment plants.3. When exploring the micro-nano bubble aeration combined with ozone to deal withsewage, we found that the degradation efficiency of pollutants was superior to themicro-nano aeration combined with air in a certain time. But the good effect aboveturned badly because the amount of ozone in water gathered more and more so that itkilled the microorganisms in the water.