Contaminants Leaching from Fresh Poultry Waste: A Lysimeter Study on Sandy Soils under Tropical Conditions

P. Adeoye, H. Man, M. Soom, A. M. Thamer, Akinbile Christopher Oluwakunmi
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引用次数: 3

Abstract

A lysimeter study was conducted on sandy soil of Minna, North central Nigeria to assess the migration of nitrates, phosphates, bacteriological parameters and heavy metals contents of poultry manure through Minna soil. This is with a view to examining the environmental effect of indiscriminate land application of excessive poultry manure on shallow groundwater quality. A lysimeter and rainfall simulator assembly was installed on an undisturbed 0.9m diameter, 3m depth soil core after which 50kg of characterized poultry manure was applied at the top. Rainfall of 125mm was simulated and water samples were collected at different depths of the soil core through the lysimeter and were taken to laboratory for analysis. Results showed that nitrate and phosphate in poultry manure were able to leach to a depth of 2.5m of the soil core four months after poultry manure application while turbidity and electrical conductivity reached their maximum value at depth 2.5m after three months. Faecal coliform, total coliform and faecal streptococci were detected at depth 2.5m also two months after the application. Statistical analysis using New Duncan Multiple Range test showed significant variation (p<0.05) of all the parameters tested with depth of sample collection and months after application of poultry manure. Spearman’s correlation coefficient established both positive and negative correlation between the parameters studied in this research. Heavy metals tested, Arsenic, copper, zinc, chromium and manganese were not able to leach beyond 0.5m depth of the soil core throughout the experimental period.
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新鲜家禽粪便中污染物的淋滤:热带条件下沙质土壤的渗滤仪研究
在尼日利亚中北部Minna的沙质土壤上进行了一项溶湿仪研究,以评估家禽粪便中硝酸盐、磷酸盐、细菌参数和重金属含量通过Minna土壤的迁移。这是为了研究不加选择地在土地上施用过量禽粪对浅层地下水质量的环境影响。在直径0.9m、深度3m的土芯上安装渗湿仪和降雨模拟器组件,然后在顶部施用50kg特征禽粪。模拟125mm的降雨,通过渗滤仪在土芯不同深度采集水样,并带至实验室分析。结果表明,施用禽粪4个月后,粪中硝酸盐和磷酸盐能够浸出至土芯2.5m深度,浊度和电导率3个月后在2.5m深度处达到最大值。施药2个月后,在2.5m深度检测粪便大肠菌群、总大肠菌群和粪便链球菌。采用New Duncan多元极差检验进行统计分析,各参数随采集深度和施用禽粪月数的变化均显著(p<0.05)。Spearman相关系数在本研究的参数之间建立了正相关和负相关关系。被测重金属砷、铜、锌、铬和锰在整个实验期间都不能浸出超过0.5m的土芯深度。
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