Evaluation Of The Performance Of Constructed Wetland System For The Treatment Of Brewery Wastewater

Environmentally friendly way of handling industrial effluents is the most importantrnconcept for industries direct and/or indirect contribution of a country’s sustainablerndevelopment. In order to achieve such goals biological processes considered to play thernmajor role. The study to evaluate the treatment performance of horizontal subsurface flowrnconstructed wetland (SSFCW) systems planted with selected emergent wetland plants forrnthe removal of pollutants from brewery wastewater was initiated. For this purpose therntreatment plant was fed with raw brewery wastewater collected from St. George BeerrnIndustry of Ethiopia. The constructed wetland for wastewater treatment was operated forrnsix months (August, 18/2010 to February, 20/2011).The four SSFCWs cells packed withrngravel media and with HRT of 7 days. One bed was left unplanted and used as a controlrnwhile each of the remaining beds was planted with Cana. indica, Phragmite. karka andrnColocasia. gigantea to each unit. Each set of SSFCW cells had influent parameters suchrnas hydraulic loading rates of 26 L/d with high-strength 4798 mg COD/L and 1714 mgrnBOD5/L from brewery wastewater. After six month operation, the laboratory analysisrngave a witness that the average removal efficiencies for the planted and unplantedrnwetlands were as follows: COD (78.9 % and 76.8 %), BOD5 (74.4% and 70.5%), TNrn(77.4% and 59.8 %), NH4-N (62.8% and 58%), NO3-N (55.2% and 42.5%), TP (68 % andrn56.1%), PO4 (81.4% and 58.4%), sulfate (36.1% and 30.1%), sulfide (97.3% and 93.4%),rnTSS (61.7% and 50%) ,TDS (54.1% and 45.5%) and EC (27.4% and 30%), respectively.rnWhile the amount of DO was increased for planted and unplanted (65.6% and 38.6%)rnrespectively.rnTherefore, the influent concentration with the average composition of COD (4798 mg/L),rnBOD5 (1714 mg/L), TN (106 mg/L) and TP (83.3 mg/L) has a great effect on pollutantrnremoval efficiency in horizontal subsurface flow constructed wetland systems.rnKeywords: Constructed wetlands, Horizontal subsurface flow, Wetland plants, TreatmentrnTechnology, Brewery wastewater

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