The impact of Aerationtime on the Nutrient Removal in Polluted Water by Canna Indica Ecological Floating Bed
In order to study the effect of aeration time on nutrient removal by plant ecological floating bed in water,Canna indica ecological floating bed was regarded as the object.Four groups were designed in the experiments,which were control,aeration time 4,8,and 12 h/d.According to the pre-experiment,the aeration rate of 2.4m3/(m2·d) was chosen.The heights of Canna indica were measured on Day 0,3,5,7,18 and 28 and DO,ρ(TN),ρ(TP),ρ(CODCr),ρ(NH3-N)and ρ(NO3-N) in water were tested as well.After the experiment,the total numbers of rhizosphere bacteria was accounted.The results showed that: ①the aeration time of groups 4h/d and 8h/d had significant difference from the control group; ②in aeration time 4h/d group the plant grew best in height,with109cm on Day 28; ③the DO reached peak with the best nutrient removal effect in the group aeration time 4h/d.On day 28,the concentration of DO reached 11.29mg/L and the removal rates of TN,TP,CODcr,NH3-N and NO3-N reached 75.10%,69.32%,65.75%,73.29% and 78.79% respectively; ④On day 28,the total amount of rhizosphere bacteria in aeration time 4h/d group accounted to 1.01 × 106(cells/mL) which was significantly more than that of other three groups,compare with 4.12× 105,9.07× 105,7.77× 105 (cells/mL) in control group,the aeration time 8,and 12 h/d group.In conclusion,when the aeration rate was designed as 2.4m3/(m2·d),the aeration time of 4 h/d was helpful for cleaning the polluted water.
Canna indica ecological floating bed polluted water aeration time
XUE Yanjun FENG Sheng XU Qiujin ZHANG Wenhui HU Yanbin ZHAO Yang
Chinese Research Academy of Environmental Sciences, Beijing 100012, China;School of Environmental & School of Environmental & Safety Engineering, Changzhou University, Changzhou, Jiangsu 213000, China Chinese Research Academy of Environmental Sciences, Beijing 100012, China
国际会议
2015 International Symposium on Environmental Science and Technology (2015 ISEST)(2015环境科学与技术国际会议)
重庆
英文
78-83
2015-11-18（万方平台首次上网日期，不代表论文的发表时间）