Acute ecotoxicity and genotoxicity assessment of two wastewater treatment units

Celente, Gleison de Souza; Colares, Gustavo Stolzenberg; Araújo, Priscila da Silva; Machado, Ênio Leandro; Lobo, Eduardo A.

doi:10.1007/s11356-019-07308-y

Cited by 21 publications

(7 citation statements)

References 40 publications

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“…One of the few studies that uses microalgae and CW's in combination is that by Celente et al (2019), where microalgae were exposed to natural light conditions, with a significant reduction in parameters such as conductivity (49%), total dissolved solids (48%), turbidity (98%), apparent color (82%), ammoniacal nitrogen (99%), total nitrogen (70%), soluble phosphorus (44%), total organic carbon (69%), inorganic carbon (86%), total carbon (83%) and chemical oxygen demand (72%). In addition, this system completely eliminated acute toxicity and genotoxicity, showing that the proposed system combining the two techniques is suitable for the treatment of effluents (Celente et al, 2020).…”

Section: Introductionmentioning

confidence: 85%

“…After 24 and 48 hours of exposure, we quantified the mobile and immobile individuals in each sample, and the concentration capable of causing immobility in 50% of the exposed individuals, EC50 (48h), calculated by the Trimmed Spearman-Karber software (Hamilton et al, 1977). Results were classified according to the scale of relative toxicity proposed by Lobo et al (2006), and recently certified by Celente et al (2020).…”

Section: Acute Ecotoxicitymentioning

confidence: 99%

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Nutrient removal efficiency using microalgae in different photoperiod cycles, combined with constructed wetland in a wastewater treatment plant

Ferreira¹,

Machado²,

Lobo³

2021

Rev. ambiente água

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This research evaluates the removal of nutrients by microalgae in different photoperiod cycles, combined with constructed wetland in the wastewater treatment plant of the University of Santa Cruz do Sul, RS, Brazil. The treatment used took place between July and December 2018 and consisted of the following steps: preliminary treatment, secondary treatment with an anaerobic reactor, microalgae tank (MT), sand filter and constructed wetland, using the macrophyte Chrysopogon zizanioides. In the microalgae tank, three light cycles were considered: 12h/12h, 24h and 18h/06h, whose lighting was powered by a white LED lamp of 9 Watts and 6000 Kelvin, regulated by a light controller. The results indicated that there were no significant differences (p>0.05) between the values of soluble phosphorus, ammoniacal nitrogen, COD and BOD for MT comparing the three photoperiod cycles (12h/12h, 24h and 18h/06h). However, the system setup removed 100% of total coliforms, E. coli and TSS in the three light cycles. Regarding the removal of nutrients and organic matter, the light cycle with the best performance was the 24-hour cycle, considering a removal of 67.6% for soluble phosphorus, 94.0% for ammoniacal nitrogen, 63.7% for COD and 42, 7% for BOD, at the end of the treatment process. These results demonstrate that the use of microalgae in combination with constructed wetland has greater efficiency in the removal of nutrients, mainly phosphorus and nitrogen, in addition to reducing physical-chemical parameters and eliminating effluent toxicity. Keywords: light cycles, microalgae tank, wastewater treatment plant.

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Section: Introductionmentioning

confidence: 85%

Section: Acute Ecotoxicitymentioning

confidence: 99%

Nutrient removal efficiency using microalgae in different photoperiod cycles, combined with constructed wetland in a wastewater treatment plant

Ferreira¹,

Machado²,

Lobo³

2021

Rev. ambiente água

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“…A partir dos cálculos obtidos para os ensaios de sensibilidade, foi possível elaborar a Carta Controle que mostra as faixas de sensibilidade apresentada pelos organismos-teste. E a partir dos resultados das determinações da CE(I)50 48h (Concentração Efetiva Inicial Mediana -concentração da amostra no início do ensaio que causa efeito agudo a 50% dos organismos em 48h) foi utilizada uma escala de toxicidade relativa para o enquadramento das amostras em distintas categorias de toxicidade (tabela 1), proposta por Lobo et al (2006), e recentemente chancelada por Celente et al (2020). Tabela 1.…”

Section: Análise De Dadosunclassified

Avaliação Da Eficiência De Um Sistema De Tratamento Multifuncional De Baixo Custo Para Tratamento De Águas Residuais Hospitalares, Através De Ensaios Ecotoxicológicos, Santa Cruz Do Sul, Rs, Brasil

Oliveira

Ribeiro

Düpont

et al. 2021

RJP

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Atividades humanas, como a descarga de qualquer tipo de efluente em sistemas lóticos e lênticos, geralmente sem nenhum tipo de tratamento, estão atualmente se tornando uma das principais preocupações ambientais. Por exemplo, efluentes de lavanderia hospitalar são caracterizados como tendo alto impacto ambiental entre os setores das unidades de saúde. Dessa forma, sistemas integrados de tratamento de efluentes têm sido propostos para melhorar sua eficiência. Neste contexto, esta pesquisa teve como objetivo avaliar a eficiência de um sistema de tratamento multifuncional de baixo custo, integrando o uso de uma célula de combustível microbiana (CCM) com Wetland Construído de Fluxo Vertical (WCFV) para tratamento de águas residuárias da lavanderia do Hospital Santa Cruz, Município de Santa Cruz do Sul, RS, Brasil, utilizando ensaios ecotoxicológicos. Os resultados indicaram que P1, ponto de coleta correspondente ao efluente bruto, apresentou uma toxicidade aguda média de CE(I)50 48h% = 29,3 ± 15,5% (Coeficiente de Variação, CV = 52,8%), sendo classificado como altamente tóxico. Já P2, ponto de coleta correspondente ao efluente tratado, apresentou uma toxicidade aguda média de CE(I)50 48h% = 100,0 ± 0,0 %, sendo classificado como não tóxico. Concluímos, desta forma, que o sistema de tratamento multifuncional de baixo custo para remediação de efluentes de lavanderia hospitalar, fui altamente eficiente, uma vez que houve a completa detoxificação do mesmo, representando uma alternativa promissora para a remoção de toxicidade de efluentes hospitalares.

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“…Heavy metal pollution poses a serious threat for human and environmental health, if not effectively removed from wastewater [ 5 ]. Coherently, a recent study highlighted that UASB treatment, followed by an aerobic bioreactor, is not adequately efficient for acute toxicity abatement in municipal wastewater treatment, with final toxicity values ranging from non-toxic to moderately toxic [ 133 ]. The applied wastewater treatment processes should consider not only metal removal efficiency, but also the potential to promote the most preferable phase distributions [ 132 ].…”

Section: Uasb Reactor and Wastewater Toxicitymentioning

confidence: 99%

Up-Flow Anaerobic Sludge Blanket (UASB) Technology for Energy Recovery: A Review on State-of-the-Art and Recent Technological Advances

2020

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Up-flow anaerobic sludge blanket (UASB) reactor belongs to high-rate systems, able to perform anaerobic reaction at reduced hydraulic retention time, if compared to traditional digesters. In this review, the most recent advances in UASB reactor applications are critically summarized and discussed, with outline on the most critical aspects for further possible future developments. Beside traditional anaerobic treatment of soluble and biodegradable substrates, research is actually focusing on the treatment of refractory and slowly degradable matrices, thanks to an improved understanding of microbial community composition and reactor hydrodynamics, together with utilization of powerful modeling tools. Innovative approaches include the use of UASB reactor for nitrogen removal, as well as for hydrogen and volatile fatty acid production. Co-digestion of complementary substrates available in the same territory is being extensively studied to increase biogas yield and provide smooth continuous operations in a circular economy perspective. Particular importance is being given to decentralized treatment, able to provide electricity and heat to local users with possible integration with other renewable energies. Proper pre-treatment application increases biogas yield, while a successive post-treatment is needed to meet required effluent standards, also from a toxicological perspective. An increased full-scale application of UASB technology is desirable to achieve circular economy and sustainability scopes, with efficient biogas exploitation, fulfilling renewable energy targets and green-house gases emission reduction, in particular in tropical countries, where limited reactor heating is required.

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Acute ecotoxicity and genotoxicity assessment of two wastewater treatment units

Cited by 21 publications

References 40 publications

Nutrient removal efficiency using microalgae in different photoperiod cycles, combined with constructed wetland in a wastewater treatment plant

Nutrient removal efficiency using microalgae in different photoperiod cycles, combined with constructed wetland in a wastewater treatment plant

Avaliação Da Eficiência De Um Sistema De Tratamento Multifuncional De Baixo Custo Para Tratamento De Águas Residuais Hospitalares, Através De Ensaios Ecotoxicológicos, Santa Cruz Do Sul, Rs, Brasil

Up-Flow Anaerobic Sludge Blanket (UASB) Technology for Energy Recovery: A Review on State-of-the-Art and Recent Technological Advances

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