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Laboratory assessment of the ecotoxic effects of sewage sludge from the Maluti-Drakensberg region on a terrestrial oligochaete species

  • Portia Mamosebetsi Mosolloane
  • Emile Bredenhand
  • Patricks Voua OtomoEmail author
Article

Abstract

We used the Enchytraeid Reproduction Test to evaluate the potential ecotoxic effects of sewage sludge samples on terrestrial oligochaetes in an Afromontane area. The sludge samples were collected from two wastewater treatment plants near the towns of Phuthaditjhaba and Harrismith in the Afromontane region of the eastern Free State in South Africa. Laboratory experiments revealed that although the sludge samples were not detrimental to the survival of Enchytraeus albidus (p > 0.05); they were able to significantly hinder its reproduction (p < 0.01). Through metal analyses, the sludge samples were found to belong to the relatively “best quality” pollutant class a sludge which is deemed suitable for land disposal and use as soil amendment for agricultural purposes. Herein, we point to the fact that the current South African sewage sludge disposal guidelines may not insure the protection of beneficial soil dwelling invertebrates such as oligochaetes. Our contribution also highlights the paucity of studies with an emphasis on environmental pollution in mountain areas across Africa and should signal a need for broader environmental considerations such as environmental pollution to be taken into account in the existing mountain invertebrate conservation methodologies.

Keywords

Metal toxicity Ecotoxicity Wastewater sludge Enchytraeidae Oligochaeta 

Notes

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants performed by any of the authors. All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.

Supplementary material

10646_2018_2002_MOESM1_ESM.pdf (75 kb)
Supplementary Information
10646_2018_2002_MOESM2_ESM.pdf (75 kb)
Supplementary Information

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Zoology and EntomologyUniversity of the Free StatePhuthaditjhabaSouth Africa
  2. 2.Afromontane Research UnitUniversity of the Free StatePhuthaditjhabaSouth Africa

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