微纳米曝气对植物浮床净化水质效果影响及数学模型分析

采用微纳米曝气和鼓风曝气对比的方式,研究了微纳米曝气再力花植物浮床水质净化效果及规律。曝气均设计相同曝气量(0.2 L/min)和曝气时间(4 h),试验共计24 d。结果表明,微纳米曝气浮床比无曝气浮床(对照组浮床)对水体CODMn、TN、NH4+-N和TP去除率分别提高19.95%、13.35%、21.72%、18.20%,而鼓风曝气组则分别为8.23%、5.64%、10.61%、10.53%。但微纳米曝气形成的富氧环境不利于NO3--N的去除,去除率低于鼓风曝气组和对照组浮床。回归分析表明,水质净化效果符合三次函数曲线方程,并分析发现试验初期植物浮床水质净化效果随时间的增加而增加,12 d后去除效果增加不明显。

THE EFFECTS OF ECOLOGICAL FLOATING BED ON WATER PURIFICATION WITH THE MICRO-NANOBUBBLE AERATION TECHNOLOGY AND ANALYSIS OF MATHEMATICAL MODEL

By parallel comparative test to air blow aeration,the effects and regulations of micro-nanobubble aeration technology on the system of Thalia dealbata floating bed were studied in the experiment.Both of the micro-nanobubble aeration-floating bed system and the air blow aeration-floating bed system were designed with aeration rate of 0.2 L/min and aeration time of 4 h every day,the experiment in 24 days.The results showed : compared with the group without aeration(the general group),the removal rates of CODMn,TN,NH4+-N and TP by micro-nanobubble aeration-floating bed system were increased 19.95%,13.35%,21.72%,18.20%,while the removal rates were increased 8.23%,5.64%,10.61%,10.53% for air blow aeration-floating bed system.However,the high concentration of DO formed by micro-nanometer aeration had negative effect on the removal of NO3——N,and the removal rate of NO3——N was lower than air blow aeration group and the control group.Regress analysis showed that the water purification followed cubic function.According to the analysis,the removal rate of water purification changed with the increase of time in the initial stage,while the treatment effect would not change significantly with the increase of time after 12 days.