Removal of ammonia from tannery effluents in a reed bed constructed wetland.
A horizontal subsurface flow reed bed, Pragmites australis, constructed wetland system was operated continuously for one year at 5 different hydraulic retention times between 5 days-11 days with real tannery industry effluent to investigate mainly NH4-N and COD removal performance of the system. The bed was also operated at different initial NH4-N concentrations between 10-30 mg/L by adding NH4Cl into the tannery effluent. The results indicated that ammonia-nitrogen removal is significantly affected by hydraulic retention time while COD is not. The optimum HRT was determined as 8 days with over 95% NH4-N and around 30% COD removal efficiency. The system shows higher removal performance at high initial NH4-N concentrations. Almost complete (99%) NH4-N removal and over 40% COD removal was obtained at (NH4-N)0 = 20 mg/L and HRT = 7 days. PO4-P and total chromium removal were not significantly affected by operating conditions
Kucuk
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OS
Dokuz Eylül University, Department of Environmental Engineering, Buca Tinaztepe Campus, Izmir, Turkey. oztank25@hotmail.com
Sengul
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F
Kapdan
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IK
D000641:Ammonia / Q000302:isolation & purification*; D000818:Animals; D001673:Biodegradation, Environmental; D019149:Bioreactors; D002417:Cattle; D017753:Ecosystem; D007220:Industrial Waste; D012867:Skin; D014872:Water Movements; D018508:Water Purification / Q000379:methods*
D007220:Industrial Waste; D000641:Ammonia