Mangroves are unique intertidal halophyte formations growing in sheltered tropical and subtropical coastal areas.Due to the increasing population and economic development,mangroves have faced degrada-tion and loss,whi...Mangroves are unique intertidal halophyte formations growing in sheltered tropical and subtropical coastal areas.Due to the increasing population and economic development,mangroves have faced degrada-tion and loss,which has been mainly caused by land conversion into aquaculture ponds in Asia.In the past several decades,the rapid growth of aquaculture has induced water pollution.Using mangroves for effluent treatment from coastal aquaculture ponds could be a suitable approach for wastewater treatment and healthy aquaculture development.An Integrated Mangrove-Aquaculture System(IMAS)was established to test whether the idea of a mangrove in situ treatment for aquaculture wastewater is feasible.The monocultures of three mangroves,Sonneratia caseolaris,Kandelia obo-vata,and Aegiceras corniculatum were established with area proportions of 45%,30%,or 15%,respectively.One control pond without mangroves was also set up.The results indicated that the mangroves had different toler-abilities to long-term inundation.The aquaculture ponds had different fishery yields,considering the mangrove species and area proportions.The water quality of most of the experimental ponds was better than the control pond,except for the planted Sonneratia.It is concluded that mangroves can reduce the concentration of dissolved inorganic nitrogen and phosphate,buffer the pH value and increase the concertration of dissolved oxygen in aqua-culture water bodies effectively.It is suggested to use 15%of the Aegiceras corniculatum area to conduct in situ purification of aquaculture wastewater and to enhance aquaculture production.展开更多
[Objective] This study aimed to make the effluent of constructed wetlands in a pond recirculating aquaculture system satisfy aquaculture requirements. [Method] A 150 m long, 0.5 m wide and 0.6 m deep ecological ditch ...[Objective] This study aimed to make the effluent of constructed wetlands in a pond recirculating aquaculture system satisfy aquaculture requirements. [Method] A 150 m long, 0.5 m wide and 0.6 m deep ecological ditch was constructed on the basis of the periphyton reactor theory, to investigate the reoxygenation and deep purification effect of the ecological ditch on the effluent of constructed wetlands. [Result] Experimental results showed that the level of dissolved oxygen （DO） in the effluent of constructed wetlands increased to a range of 4.41-7.91 mg/L and pH val- ue increased significantly by flowing though the ecological ditch （P〈0.05）. DO level in the water of ecological ditch increased linearly with the increasing length of the ecological ditch within the range of 150 m （P〈0.05）. The ecological ditch showed further removal effect on NH4＋-N, IMn and PO4^3 -P in the effluent of the constructed wetlands, with the removal rate of 19.46%, 13.38% and 31.09%, respectively. The total coliform group was also eliminated with the removal rate ranging between 12.5% and 78.13%. [Conclusion] The ecological ditch based on periphyton reactor could improve DO level and further reduce N and P contents in the effluent of the constructed wetlands, which could be used as a matching water-reuse system of constructed wetlands. Key words Water quality; Purification; Dissolved oxygen; Periphyton; Pond aquaculture展开更多
基金This research was supported by the“863 Project”of the Ministry of Science and Technology,China(No.2007AA091703 and 2003AA627030)。
文摘Mangroves are unique intertidal halophyte formations growing in sheltered tropical and subtropical coastal areas.Due to the increasing population and economic development,mangroves have faced degrada-tion and loss,which has been mainly caused by land conversion into aquaculture ponds in Asia.In the past several decades,the rapid growth of aquaculture has induced water pollution.Using mangroves for effluent treatment from coastal aquaculture ponds could be a suitable approach for wastewater treatment and healthy aquaculture development.An Integrated Mangrove-Aquaculture System(IMAS)was established to test whether the idea of a mangrove in situ treatment for aquaculture wastewater is feasible.The monocultures of three mangroves,Sonneratia caseolaris,Kandelia obo-vata,and Aegiceras corniculatum were established with area proportions of 45%,30%,or 15%,respectively.One control pond without mangroves was also set up.The results indicated that the mangroves had different toler-abilities to long-term inundation.The aquaculture ponds had different fishery yields,considering the mangrove species and area proportions.The water quality of most of the experimental ponds was better than the control pond,except for the planted Sonneratia.It is concluded that mangroves can reduce the concentration of dissolved inorganic nitrogen and phosphate,buffer the pH value and increase the concertration of dissolved oxygen in aqua-culture water bodies effectively.It is suggested to use 15%of the Aegiceras corniculatum area to conduct in situ purification of aquaculture wastewater and to enhance aquaculture production.
基金Supported by Earmarked Fund for Modern Agro-industry Technology Research System (CARS-46)National Key Technology Research and Development Program of the Ministry of Science and Technology of China(Grant No.2012BAD25B05)Special Fund for Agro-scientific Research in the Public Interest(201203083)~~
文摘[Objective] This study aimed to make the effluent of constructed wetlands in a pond recirculating aquaculture system satisfy aquaculture requirements. [Method] A 150 m long, 0.5 m wide and 0.6 m deep ecological ditch was constructed on the basis of the periphyton reactor theory, to investigate the reoxygenation and deep purification effect of the ecological ditch on the effluent of constructed wetlands. [Result] Experimental results showed that the level of dissolved oxygen （DO） in the effluent of constructed wetlands increased to a range of 4.41-7.91 mg/L and pH val- ue increased significantly by flowing though the ecological ditch （P〈0.05）. DO level in the water of ecological ditch increased linearly with the increasing length of the ecological ditch within the range of 150 m （P〈0.05）. The ecological ditch showed further removal effect on NH4＋-N, IMn and PO4^3 -P in the effluent of the constructed wetlands, with the removal rate of 19.46%, 13.38% and 31.09%, respectively. The total coliform group was also eliminated with the removal rate ranging between 12.5% and 78.13%. [Conclusion] The ecological ditch based on periphyton reactor could improve DO level and further reduce N and P contents in the effluent of the constructed wetlands, which could be used as a matching water-reuse system of constructed wetlands. Key words Water quality; Purification; Dissolved oxygen; Periphyton; Pond aquaculture
