净化槽水质改善与植物生理日变化关系的研究

Study on the relationship between water quality improvement and Nymphaea tetragona physiological diurnal variation in purification tanks

试验设定曝气和非曝气的两组工况植物净化槽,在一天中不同时间点测定净化槽的出水水质及植物根组织过氧化物酶(POD)、过氧化氢酶(CAT)活性与叶片可溶性蛋白(SP)、叶绿素(Chla)含量.分析了污染物去除与植物(睡莲)生理特性日变化的相关性及曝气对水质净化及植物生理的影响机制.结果表明:两组工况净化槽内植物生理特性与水质理化指标均在一定程度上受到光强变化的影响,植物根组织POD,CAT活性及叶片Chla,SP含量与净化槽DO浓度,CODCr,NH4+-N和TP去除率间呈正相关;曝气对植物根组织POD,CAT活性及叶片SP,Chla含量影响显著;曝气净化槽的出水DO浓度,CODCr,NH4+-N和TP去除率分别高出非曝气净化槽2.54mg/L,21.0%,16.6%和14.1%.

With the non-aeration（Ⅰ） and aeration（Ⅱ） conditions of two aquatic plant purifying-tanks,the changes of plant physiological traits including the activities of POD,CAT,and the contents of SP,Chla,and the main physical water quality in a day at different times,were observed.Correlation between diurnal variation of plant physiological traits and removal efficiencies of CODCr,NH4^＋-N,TP were analyzed,and the effect of aeration to plant physiological traits and the purifying effect were studied.The results showed that the plant physiology and the water quality index were affected by the light intensity changes to some extent.The physiological traits of Nymphaea tetragona had positive correlations with the removal efficiencies of CODCr,NH4^＋-N,TP.Aeration affected the activities of POD,CAT and the contents of SP,Chla significantly;the water quality of two conditions of purification tanks were affected by the variation of light intensity.The content of DO and the removal efficiencies of CODCr,NH4^＋-N,TP in the conditionⅡexceeded the conditionⅠby 2.54 mg/L,21.0%,16.6% and 14.1%,respectively.