Nitrogen Removal Efficiency of Floating Constructed Wetland System in Treating Catfish Farming Wastewater

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Wiphada Wongruankaew
โสมนัส สมประเสริฐ


The objective of this study was to compare two type of plants to treat nitrogen in floating constructed wetland system. Laboratory scale models with the capacity of 106 liters planted with Cyperus spp. and  Neomarica spp. three tanks each. The 33x33x5 cm. Styrofoam with nine 6.5 cm holes was used as plant supporter. The 14 mg TKN/L of catfish farming wastewater was batched feeding to the models with 7 days of hydraulic retention time. The study revealed that the model planted with Cyperus spp. had the highest nitrogen removal efficiencies comparing with the models with Neomarica spp. and the control systems. The model planted with Cyperus spp. had a TKN removal efficiency of 77% and left only 3 mg/L in an average of TKN in the effluent. In addition, ammonia removal efficiency was also high, 87%, with 0.7 mg/L of ammonia in the effluent. The Cyperus spp. grow well in the catfish farming wastewater with had high both organic and nitrogen loading. Cyperus spp. grew up 42 cm. of above ground part and increased 56 cm. of root part. Plant density increased from 2 shoots/m2 to 25 shoots/m2 with 1 kg/(m2-d) of biomass increasing. On the other hand, Neomarica spp. grew up 39 cm. of above ground part and 9.56 cm. of root part with only 1 kg/(m2-d) of biomass increasing.


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