College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China.
J Environ Sci (China). 2014 May 1;26(5):1090-8. doi: 10.1016/S1001-0742(13)60500-8.
Numerous studies on eutrophication remediation have mainly focused on purifying water first, then restoring submerged macrophytes. A restoration-promoting integrated floating bed (RPIFB) was designed to combine the processes of water purification and macrophyte restoration simultaneously. Two outdoor experiments were conducted to evaluate the ecological functions of the RPIFB. Trial 1 was conducted to compare the eutrophication purification among floating bed, gradual-submerging bed (GSB) and RPIFB technologies. The results illustrated that RPIFB has the best purification capacity. Removal efficiencies of RPIFB for TN, TP, NH(+)4-N, NO(-)3-N, CODCr, Chlorophyll-a and turbidity were 74.45%, 98.31%, 74.71%, 88.81%, 71.42%, 90.17% and 85%, respectively. In trial 2, influences of depth of GSB and photic area in RPIFB on biota were investigated. When the depth of GSB decreased and the photic area of RPIFB grew, the height of Potamogeton crispus Linn. increased, but the biomass of Canna indica Linn. was reduced. The mortalities of Misgurnus anguillicaudatus and Bellamya aeruginosa in each group were all less than 7%. All results indicated that when the RPIFB was embedded into the eutrophic water, the regime shift from phytoplankton-dominated to macrophyte-dominated state could be promoted. Thus, the RPIFB is a promising remediation technology for eutrophication and submerged macrophyte restoration.
众多富营养化修复研究主要集中在首先净化水质，然后恢复沉水植物。本研究设计了一种促进沉水植物恢复的集成浮床（RPIFB），以同时结合水质净化和沉水植物恢复过程。进行了两项室外实验来评估 RPIFB 的生态功能。实验 1 比较了浮床、渐进淹没床（GSB）和 RPIFB 技术的富营养化净化效果。结果表明，RPIFB 具有最佳的净化能力。RPIFB 对 TN、TP、NH(+)4-N、NO(-)3-N、CODCr、叶绿素-a 和浊度的去除效率分别为 74.45%、98.31%、74.71%、88.81%、71.42%、90.17%和 85%。实验 2 研究了 GSB 深度和 RPIFB 光区对生物的影响。当 GSB 深度降低和 RPIFB 光区增长时，菹草的高度增加，但美人蕉的生物量减少。各组泥鳅和铜锈环棱螺的死亡率均小于 7%。所有结果表明，当 RPIFB 嵌入富营养化水中时，可以促进从浮游植物占主导到沉水植物占主导的状态转变。因此，RPIFB 是一种有前途的富营养化和沉水植物修复技术。
