Treatment of Fishery Wastewater Using a Floating Treatment Wetland Planted with Umbrella Sedge
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Abstract
This study evaluates the effectiveness of floating treatment wetlands (FTWs) using umbrella sedge (Cyperus spp.) for removing organic and nitrogen from fishery wastewater in Thailand. Aquaculture in Thailand produces significant wastewater with high organic matter and nitrogen, necessitating effective treatment solutions. FTWs are designed to float in fishponds, providing a flexible and space-saving method for wastewater treatment compared to traditional wetlands. The study used four laboratory-scale FTW reactors with varying hydraulic loading rates (5, 10, 15, and 20 cm/d) to assess their impact on pollutant removal. The FTW with the lowest hydraulic loading rate, 5 cm/d (HRT 20 days) achieved the highest removal efficiencies of 45% 63% and 61% for COD TKN and NH3-N, respectively, demonstrating the system's effectiveness. Umbrella sedge grew best in the 5 cm/d reactors, where improved aerobic conditions boosted biodegradation, nitrification, and pollutant decomposition. The study concludes that FTWs are a sustainable and efficient solution for treating aquaculture wastewater, particularly at lower hydraulic loading rates, thus supporting better aquaculture practices.
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References
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