title: [Treatment effect of biological filtration and vegetable floating-bed combined system on greenhouse turtle breeding wastewater].
abstract: Unorganized discharge of greenhouse turtle breeding wastewater has brought several negative influences on the ecological environment in the rural area of Yangtze River Delta. Biological filtration and vegetable floating-bed combined system is a potential ecological method for greenhouse turtle breeding wastewater treatment. In order to explore the feasibility of this system and evaluate the contribution of vegetable uptake of nitrogen (N) and phosphorus (P) in treating greenhouse turtle breeding wastewater, three types of vegetables, including Ipomoea aquatica, lettuce and celery were selected in this study. Results showed the combined system had a high capacity in simultaneous removal of organic matter, N and P. The removal efficiencies of COD, NH4(+)-N, TN and TP from the wastewater reached up to 93.2%-95.6%, 97.2%-99.6%, 73.9%-93.1% and 74.9%-90.0%, respectively. System with I. aquatica had the highest efficiencies in N and P removal, followed by lettuce and celery. However, plant uptake was not the primary pathway for TN arid TP removal in the combined system. The vegetable uptake of N and P accounted for only 9.1%-25.0% of TN and TP removal from the wastewater while the effect of microorganisms would be dominant for N and P removal. In addition, the highest amounts of N and P uptake in I. aquatica were closely related with the biomass of plant. Results from the study indicated that the biological filtration and vegetable floating-bed combined system was an effective approach to treating greenhouse turtle breeding wastewater in China.
authors.forename: Chong-Jun
authors.initials: CJ
authors.lastname: Chen
authors.forename: Rui
authors.initials: R
authors.lastname: Zhang
authors.forename: Kun
authors.initials: K
authors.lastname: Xiang
authors.forename: Wei-Xiang
authors.initials: WX
authors.lastname: Wu
mesh_terms: D000818:Animals; D000077102:Apium; D001673:Biodegradation, Environmental; D002681:China; D027741:Ipomoea; D018545:Lactuca; D009584:Nitrogen; D010758:Phosphorus; D014426:Turtles; D014675:Vegetables; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater
chemical_list: D009584:Nitrogen; D010758:Phosphorus; D062065:Wastewater