TY - JOUR
T1 - 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
AU - Domínguez-Crespo, Miguel A.
AU - Sánchez-Hernández, Z. Erika
AU - Torres-Huerta, Aidé M.
AU - Negrete-Rodríguez, Ma De La Luz X.
AU - Conde-Barajas, Eloy
AU - Flores-Vela, Abelardo
N1 - Funding Information:
Acknowledgements This study has been financially supported by CONACYT (project numbers 61354 and 90635) and the Instituto Politécnico Nacional (project numbers SIP-2010-0087, 2010-0062) and SNI-CONACYT. The authors would like to thank Elvira Castellanos for her technical support.
PY - 2012/2
Y1 - 2012/2
N2 - 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.
AB - 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.
KW - BAF
KW - E. fetida
KW - Heavy metals
KW - Metal accumulation
KW - Sewage sludge
UR - http://www.scopus.com/inward/record.url?scp=84856520742&partnerID=8YFLogxK
U2 - 10.1007/s11270-011-0913-7
DO - 10.1007/s11270-011-0913-7
M3 - Artículo
SN - 0049-6979
VL - 223
SP - 915
EP - 931
JO - Water, Air, and Soil Pollution
JF - Water, Air, and Soil Pollution
IS - 2
ER -