Tubifex tubifex
has been shown to survive in organic polluted environments, however, not much has
been done on its inorganic pollution tolerance. Samples of
T. tubifex and their respective sewage sludge were taken from
Soche wastewater treatment plant in Blantyre City, Malawi during July 2007 to November 2008. The total number of
sludge samples taken was fifty one which was made into seventeen composite samples. A total of seventeen
T. tubifex
samples were also collected. The samples were analyzed for copper, lead, manganese, zinc and cadmium using standard
methods from American Public Health Association and Association of Official Analytical Chemists. The concentrations
of metals in sewage sludge and
T. tubifex were on dry weight basis and the metals determined were acid extractable. In
general, heavy metals concentration was lower in
T. tubifex than in sewage sludge. The range of heavy metals concentrations
were (in sludge and (
T. tubifex)): zinc 275.3 - 361.5 mg/kg (45.0 - 82.2 mg/kg), manganese 293.7 - 230.1 mg/kg (1.21 -
3.69 mg/kg), copper 86.5 - 120.1 mg/kg (1.6 - 4.7 mg/kg), lead 11.2 - 22.4 mg/kg (Below detection limit – 0.95 ) and
cadmium 1.12 - 2.31 mg/kg (1.08 - 2.18 mg/kg). The results showed significant differences between the concentrations
of manganese, copper, lead and zinc in sewage sludge and
T. tubifex (p < 0.05). However there was no significant
difference between the concentrations of cadmium in sewage sludge and
T. tubifex (p > 0.05).
T. tubifex did not show the
ability to accumulate heavy metals (attributed to its high defecation and metabolic rate) except for cadmium hence
cannot be used as a bioindicator for heavy metal pollution in sludge.
