Heavy metal distribution and speciation during sludge reduction using aquatic worms

► Heavy metal distribution during the reduction of sewage sludge by Limnodrilus hoffmeisteri was investigated. ► Heavy metal accumulations in worms during consumption of sewage sludge were described. ► Heavy metal speciation in sludge during predation by worms was determined. ► Effect of heavy metals on the performance of worms for sludge reduction was discussed.