背景:埃塞俄比亚的大多数现有工业都将未经处理的废水排放到附近的水体中,溪流和开阔的土地。由Gondar麦芽厂(GMF)产生的废水被自由处置,并加入用于处理废水的天然湿地。该研究的目的是分析和表征来自GMF的废水,并评估湿地用于处理目的的有效性。
方法:不同的物理化学质量指标(颜色,浊度pH值,温度,总溶解固体,总悬浮固体,总固体,电导率,碱度,硬度,硝酸盐,磷酸盐,硫酸盐,游离氯化物,重金属-(Cd,Cr,Fe,Mn,和Pb)和生物需氧量根据标准程序进行测量。使用社会科学统计软件包(SPSS-25)分析数据。使用方差分析(ANOVA)来确定所研究参数在不同采样站中是否存在显着差异。P值小于0.05被认为显示显著差异。
结果:这项研究的结果表明,除碱度M外,大多数质量指标在水通过湿地后的值都有所提高,亚硫酸盐,Mn,温度和pH。从方差分析结果来看,据指出,除了铬,两个站之间存在显著的平均差异,锰和铅.结果表明,湿地对污染物的去除作用很大,当去除效率为96.188%PO4HR时,湿地效果最好。75.63%硝酸盐,>99%Cl2,氨和亚硝酸盐99.99%,92.77%硫酸盐,总硬度84.36%,87.43%颜色,对其他人来说,它在30%到60%之间。
结论:该研究得出结论,GMF湿地几乎是有效的,并且在处理排放设施的废水方面具有潜力(尤其是对于养分,碱度P,硬度,颜色和氯化物)。建议保护湿地并将其用作废水处理设施。
BACKGROUND: The majority of existing industries in Ethiopia discharge untreated effluents into nearby water bodies, streams and open land. The wastewater generated by Gondar malt factory (GMF) was disposed freely and join a natural wetland implemented for the treatment of the wastewater. The objective of the study was to analyze and characterize wastewater from GMF and to evaluate the effectiveness of the wetland for the treatment purpose.
METHODS: Different Physicochemical quality indicators (color, turbidity pH, temperature, Total Dissolved solids, Total Suspended solids, total solid, conductivity, alkalinity, hardness, nitrate, phosphate, sulfate, free chlorides, heavy metals-(Cd, Cr, Fe, Mn, and Pb)and Biological Oxygen Demand were measured according to the standard procedures. Data was analyzed using Statistical Package for Social Sciences (SPSS-25). Analysis of Variance (ANOVA) was used to find whether significant differences existed in the different sampling stations for the parameters studied. P value less than 0.05 was considered to show significant difference.
RESULTS: The results of this study revealed that most of the quality indicators were improved in value after the water passed through the wetland except for alkalinity M, sulfite, Mn, temperature and pH. From ANOVA result, it was noted that there was a significant mean difference between the stations except for chromium, manganese and lead. The result showed that the wetland plays a great role in the removal of pollutants where the best performance was obtained at removal efficiency of 96.188% PO4HR,75.63% Nitrate,>99% Cl2, ammonia and nitrite 99.99%, 92.77% sulfate,84.36% Total hardness,87.43% color, and for others it is ranged between 30 and 60%.
CONCLUSIONS: the study concluded that GMF wetland was almost effective and had potential in treatment of the wastewater from the discharging facilities (especially for nutrients, alkalinity P, hardness, color and chloride). It is recommended that wetlands should be conserved and used as wastewater treatment facility.