2 research outputs found
Evaluation of Daphnia Magna as an Indicator of Toxicity and Treatment Efficacy of Municipal Sewage Treatment Plant
Performance evaluation of wastewater treatment plants (WWTPs) with
special reference to toxicity reduction using Daphnia magna straus as
test organism is very important to study the likely adverse effects of
the treated wastewater on the aquatic ecosystem of receiving waters and
to detect common environmentally realistic concentrations of pollutants
at different concentration levels and toxicity discriminatory ability
to distinguish different degree of toxicity and toxic specificity of
the compounds on target organisms. This test can be considered as
useful analytical tool for screening of chemical analysis and early
warning system to monitor the different operational units of wastewater
treatment plants. Interrelationship between COD, SS with respect to
Daphnia toxicity (Gd) suggests that improvement of the toxicological
quality of wastewater could be linked to the removal of both COD and
suspended solids. Both the parameters (COD & SS) can serve as a
regulatory tool in lieu of an explicit toxicological standard. An
important feature of this work was to emphasize the significance of
toxicity tests. It could help to reduce influent toxicity and thereby
avoid impacting microorganisms\u2019 population in activated sludge
systems. This study shows the difference between using physico-chemical
and biological criteria to define the quality or toxicity of
wastewater, making it clear that both methods are indispensable and
complimentary and support the earlier view that Daphnia magna can serve
as a valuable model for bio- monitoring of water pollution and for
evaluation of the toxicity of an effluent and risk assessment in an
aquatic body, as it is highly sensitive to pollutants