首页> 美国卫生研究院文献>Italian Journal of Food Safety >Heavy metals accumulation from sewage sludge in the Nile tilapia Oreochromis niloticus (Trewavas 1983) during a sludge-earthworm-fish short-term cycling
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Heavy metals accumulation from sewage sludge in the Nile tilapia Oreochromis niloticus (Trewavas 1983) during a sludge-earthworm-fish short-term cycling

机译:污泥-th-鱼短期循环过程中尼罗罗非鱼Oreochromis niloticus(Trewavas1983)的污水污泥中重金属积累

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摘要

Municipal sewage sludge from waste-water treatment is an important nutritional source for sustainable agriculture. Here, we report on the assessment of the accumulation of heavy metals in Nile tilapia Oreochromis niloticus (Trewavas 1983) fed on earthworms Eisenia fetida reared on soil treated with different concentrations of sewage sludge (25% and 100%) during sludge-earthworm-fish short-term cycling. In this short-term cycling the Nile tilapia collected from the White Nile were chosen as final consumers, whereas the earthworms reared on loam soil mixed with different ratios of sludge were used as a feed for the final consumers. Our results indicate that the concentrations of Cd2+, Cr2+, Pb2+ and Zn2+ in the sludge treated soil are proportional to the sludge content in the soil. Importantly, the accumulation of these heavy metals was significantly low in the earthworms and the Nile tilapia in comparison with the treated soil and that these concentrations in the Nile tilapia were below the international limits recommended by the US Environmental Protection Agency (2014). Moreover, the growth and overall flesh quality of the fish were improved as indicated by the growth increase up to 146% when fed on earthworm reared in 100% sludge. Additionally, our physico-chemical properties (i.e. pH, soil moisture, electric conductivity and organic matters) evaluation on the soil indicates an improvement of the soil quality when mixed with sewage sludge. These results suggest a sustainable application of sewage sludge in fish culture owing to its high nutritional values, low cost, and low risk of hazardous heavy metals when using primary consumers with heavy metals bioaccumulation capability such as E. fetida.
机译:废水处理产生的城市污水污泥是可持续农业的重要营养来源。在这里,我们报告了对以E Eisenia fetida为食的尼罗罗非鱼Oreochromis niloticus(Trewavas 1983)中重金属积累的评估,该ise在污泥-th鱼中用不同浓度的污泥(25%和100%)处理过的土壤中饲养短期骑自行车。在这个短期循环中,从白尼罗河中收集的尼罗罗非鱼被选为最终消费者,而ed在与不同比例污泥混合的肥沃土壤上饲养的worm被用作最终消费者的饲料。我们的结果表明Cd 2 + ,Cr 2 + ,Pb 2 + 和Zn 2 + 的浓度污泥处理过的土壤中的污泥含量与土壤中的污泥含量成正比。重要的是,与处理过的土壤相比,the和尼罗罗非鱼中这些重金属的积累非常低,并且尼罗罗非鱼中的这些浓度低于美国环境保护局(2014)推荐的国际限量。此外,以100%污泥饲养的earth为食,其生长增至146%,表明鱼的生长和整体肉质得到改善。此外,我们对土壤的理化特性(即pH值,土壤水分,电导率和有机物)评估表明,与污水污泥混合后,土壤质量得到改善。这些结果表明,污水污泥的营养价值高,成本低,在使用具有重金属生物蓄积能力的主要消费者(如大肠杆菌)时具有较高的营养价值,成本低,危险的重金属风险低,因此可在鱼类养殖中可持续应用。

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