A restoration-promoting integrated floating bed and its experimental performance in eutrophication remediation

• Published in: Journal of environmental sciences (China) 2014-05, Vol.26 (5), p.1090-1098
• Main Authors: Guo, Yiming, Liu, Yunguo, Zeng, Guangming, Hu, Xinjiang, Li, Xin, Huang, Dawei, Liu, Yunqin, Yin, Yicheng
• Format: Article
• Language: English
• Subjects: Bellamya aeruginosa; Biodegradation, Environmental; Biological Oxygen Demand Analysis; Biomass; Bioreactors; Canna indica; Eutrophication; floating bed; Light; Nitroglycerin - chemistry; Nitroglycerin - metabolism; Outdoor; Phosphorus - chemistry; Phosphorus - metabolism; Photics; Plants - metabolism; Potamogeton crispus; Purification; regime shift; Remediation; Restoration; Submerged; submerged macrophyte; Time Factors; Turbidity; Water Pollutants, Chemical - chemistry; Water Pollutants, Chemical - metabolism; Water Purification - methods; 实验性能; 富营养化治理; 整治; 植物恢复; 水体富营养化; 水生植物; 沉水植物; 浮床
• ISSN: 1001-0742; 1878-7320
• 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 RP1FB. 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,NH4＋-N, NO3-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.