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Data on effluent toxicity and physicochemical parameters of municipal wastewater treatment plant using Daphnia Magna.

ABSTRACT: Toxicity of Municipal Wastewater Treatment Plant Effluent (MWWTPE) was evaluated using bioassay with Daphnia Magna (D. Magna). Acute toxicity tests were performed on effluent samples of Urmia municipal wastewater treatment plant (Biolac system) according to the USEPA methods and 24, 48, 72, and 96?hr lethal concentration 50% (LC₅₀) were calculated by application of Probit analysis. Also interrelationship between main effluent physicochemical parameters of wastewater (BOD₅, COD, and TSS) and 24hr-LC₅₀, were studied. Results showed that the effluent was safe to be discharged to the surface water in regard to physicochemical parameters and acute toxicity unit (TUa), according to the standards of Iranian Department of Environment (DOE). Relationship between effluent COD and 24hr-LC₅₀ show that, increase in effluent COD resulted in increase in wastewater toxicity and there was not relationship between BOD₅, TSS and toxicity of effluent.

SUBMITTER: Gholami-Borujeni F

PROVIDER: S-EPMC6141377 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature

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Data on effluent toxicity and physicochemical parameters of municipal wastewater treatment plant using Daphnia Magna.

Gholami-Borujeni Fathollah F Nejatzadeh-Barandozi Fatemeh F Aghdasi Hamed H

Data in brief 20180628

Toxicity of Municipal Wastewater Treatment Plant Effluent (MWWTPE) was evaluated using bioassay with Daphnia Magna (D. Magna). Acute toxicity tests were performed on effluent samples of Urmia municipal wastewater treatment plant (Biolac system) according to the USEPA methods and 24, 48, 72, and 96 hr lethal concentration 50% (LC50) were calculated by application of Probit analysis. Also interrelationship between main effluent physicochemical parameters of wastewater (BOD ...[more]

PMID: 30229056

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Project description:During their aquatic life cycle, nanoparticles are subject to environmentally driven surface modifications (e.g. agglomeration or coating) associated with aging. Although the ecotoxicological potential of nanoparticles might be affected by these processes, only limited information about the potential impact of aging is available. In this context, the present study investigated acute (96 h) and chronic (21 d) implications of systematically aged titanium dioxide nanoparticles (nTiO2; ~90 nm) on the standard test species Daphnia magna by following the respective test guidelines. The nTiO2 were aged for 0, 1, 3 and 6 d in media with varying ionic strengths (Milli-Q water: approx. 0.00 mmol/L and ASTM: 9.25 mmol/L) in the presence or absence of natural organic matter (NOM). Irrespective of the other parameters, aging in Milli-Q did not change the acute toxicity relative to an unaged control. In contrast, 6 d aged nTiO2 in ASTM without NOM caused a fourfold decreased acute toxicity. Relative to the 0 d aged particles, nTiO2 aged for 1 and 3 d in ASTM with NOM, which is the most environmentally-relevant setup used here, significantly increased acute toxicity (by approximately 30%), while a toxicity reduction (60%) was observed for 6 d aged nTiO2. Comparable patterns were observed during the chronic experiments. A likely explanation for this phenomenon is that the aging of nTiO2 increases the particle size at the start of the experiment or the time of the water exchange from <100 nm to approximately 500 nm, which is the optimal size range to be taken up by filter feeding D. magna. If subjected to further agglomeration, larger nTiO2 particles, however, cannot be retained by the daphnids' filter apparatus ultimately reducing their ecotoxicological potential. This non-linear pattern of increasing and decreasing nTiO2 related toxicity over the aging duration, highlights the knowledge gap regarding the underlying mechanisms and processes. This understanding seems, however, fundamental to predict the risks of nanoparticles in the field.

Dataset Information

Data on effluent toxicity and physicochemical parameters of municipal wastewater treatment plant using Daphnia Magna.

Publications

Data on effluent toxicity and physicochemical parameters of municipal wastewater treatment plant using Daphnia Magna.

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