Accumulation of heavy metals by earthworms from vermicomposting sewage sludges
Please cite as: CHEMIK 2014, 68, 10, 868–873
The aim of this study was to analyzed the ability to accumulate heavy metals in the earthworms of sewage sludge treating and to determine the factors influencing the effect. The contents of heavy metals in raw sewage sludge, vermicomposts, earthworms and coprolite were analyzed. It was found that content of heavy metals in vermicompost during the process was increased. Probably this is due to the weight reduction of treated sludges, although the additive of plant material. Earthworms accumulated a higher content of heavy metals as compared with the ground (vermicompost). On the metals accumulation effect in earthworms bodies influenced the content of metals, organic matter and pH of sewage sludge.
Keywords: sewage sludge, vermicompost, earthworms, heavy metals
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