Effect of the Heavy Metals Cu,Ni, Cd and Zn on the Growth and Reproduction of Epigeic Earthworms (E. fetida) during the Vermistabilization of Municipal Sewage Sludge |
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Authors: | Domínguez-Crespo Miguel A Sánchez-Hernández Z Erika Torres-Huerta Aidé M Negrete-Rodríguez Ma de la Luz X Conde-Barajas Eloy Flores-Vela Abelardo |
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Institution: | 1.Instituto Politecnico Nacional, CICATA-Altamira, Km 14.5, Carretera Tampico-Puerto Industrial Altamira, 89600, Altamira, Tamps, Mexico ;2.Departamento de Bioquímica, Instituto Tecnologico de Celaya, Av. Tecnologico y García Cubas s/n, 38010, Celaya, Guanajuato, Mexico ; |
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Abstract: | In order to enhance the removal of heavy metals such as Ni, Cu, Zn and Cd from wastewater, different cow dung/sewage sludge
ratios were tested to assess the effect of these metals on the adaptability of Eisenia fetida earthworms to the treatment process carried out in a typical plant located in Tamaulipas, Mexico. Two experimental water
treatment setups were proposed. The first set of experiments was planned to determine the adequate sewage sludge/cow dung
ratio(s), whereas the second arrangement was designed to evaluate the growth performance and fecundity of the earthworms under
high heavy metal concentrations. To achieve the objectives, the experiments were conducted for 90 days under controlled environmental
conditions. Maximum worm biomass and growth rates were attained in samples containing 25 wt.% of sewage sludge. Weight and
mortality of worms were significantly affected by the high levels of heavy metals, making difficult the metal accumulation
in the worm tissues. |
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