Alteration of in vitro and acute in vivo toxicity of textile dyeing wastewater after chemical and biological remediation

The study was conducted in 2013/14 with the objective of determining the effects of Bahir Dar textile factory effluents on the head of Blue Nile River water quality. Dissolve oxygen was higher at the upstream site of the river, whereas BOD5, TDS, and total alkalinity values were higher at wastewater outlet of the factory site. The mean values of dissolved oxygen, BOD5, and total alkalinity were above maximum permissible limits set by WHO for drinking water at head of Blue Nile River. The mean value of BOD5 was above permissible limit of IFC for textile effluents to be discharged to surface water. A total of 836 aquatic macroinvertebrate individuals belonging to 21 families were collected. The Shannon-Wiener Diversity Index, the Hilsenhoff family-level biotic index, family richness, and percent dipterans were calculated. Hilsenhoff family-level biotic index and percent dipterans metrics differed significantly among sampling sites (P < 0.05). Hilsenhoff family-level biotic index was higher at the most downstream site but percent dipterans were higher at site of discharge of effluent to the head of Blue Nile River. Therefore, there is indication that effluent demands frequent control and proper treatment before being discharged to the environment.

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“…The major concern with color is its aesthetic character at the point of discharge with respect to the visibility of the receiving waters [4–6]. …”

Section: Introductionmentioning

confidence: 99%

Effects of Bahir Dar Textile Factory Effluents on the Water Quality of the Head Waters of Blue Nile River, Ethiopia

Mehari

Gebremedhin

Ayele

2015

International Journal of Analytical Chemistry

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“…The complex chemical structure of synthetic dyes renders them resistant to chemical, physical, and biological treatment [2,7]. Hence, discharge of these compounds into water bodies is undesirable not only for aesthetic reasons but also because many dyes and their by-products are toxic to both aquatic and human life [2,[8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Textile dyes induce toxicity on zebrafish early life stages

Oliveira

Lapuente²,

Teixidó

et al. 2015

Enviro Toxic and Chemistry

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Textile manufacturing is one of the most polluting industrial sectors because of the release of potentially toxic compounds, such as synthetic dyes, into the environment. Depending on the class of the dyes, their loss in wastewaters can range from 2% to 50% of the original dye concentration. Consequently, uncontrolled use of such dyes can negatively affect human health and the ecological balance. The present study assessed the toxicity of the textile dyes Direct Black 38 (DB38), Reactive Blue 15 (RB15), Reactive Orange 16 (RO16), and Vat Green 3 (VG3) using zebrafish (Danio rerio) embryos for 144 h postfertilization (hpf). At the tested conditions, none of the dyes caused significant mortality. The highest RO16 dose significantly delayed or inhibited the ability of zebrafish embryos to hatch from the chorion after 96 hpf. From 120 hpf to 144 hpf, all the dyes impaired the gas bladder inflation of zebrafish larvae, DB38 also induced curved tail, and VG3 led to yolk sac edema in zebrafish larvae. Based on these data, DB38, RB15, RO16, and VG3 can induce malformations during embryonic and larval development of zebrafish. Therefore, it is essential to remove these compounds from wastewater or reduce their concentrations to safe levels before discharging textile industry effluents into the aquatic environment.

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“…AC preparation by chemical activation leads low surface area, whereas physical method may lead to high surface area (Ros et al 2006). Synthetic organic dyes have been extensively used in textile, paper, printing, food, cosmetics and leather industries (Mittal et al 2008;Hameed and Lee 2009;Ben Mansour et al 2012;Gupta et al 2012). Dyes are an important class of organic pollutants in the ecosystem.…”

Section: Introductionmentioning

confidence: 99%

Preparation of activated carbons from bio-waste: effect of surface functional groups on methylene blue adsorption

Reddy

Krushnamurty

Mahammadunnisa

et al. 2014

Int. J. Environ. Sci. Technol.

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Low-cost activated carbons were prepared by physical activation of bio-waste rice husk. Various physicochemical characterization techniques confirmed the high surface area and oxygen functional groups on the surface. It has been confirmed that activation under humidified carbon dioxide followed by ozonation resulted the highest number of surface functional groups on activated carbon. Nitrogen adsorption-desorption isotherms confirmed the highest surface area (417 m 2 /g), whereas elemental analysis ensured the increasing oxygen content after activation. Temperature-programmed decomposition quantified these surface oxygen functional groups, and it was concluded that ozonation increased both acidic and basic groups. The developed activated carbons were tested during the removal of a model dye methylene blue from aqueous medium in the concentration range 10-30 mg/L. Typical results indicated that adsorption studies are consistent with the Langmuir isotherm model with maximum monolayer adsorption capacity of 28.5 mg/g, and the dimensionless separation factor (R L ) values between 0.006 and 0.030 confirmed a favorable adsorption. Methylene blue adsorption followed pseudo-second order kinetics indicating MB was adsorbed onto the surface via chemical interaction.

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Alteration of in vitro and acute in vivo toxicity of textile dyeing wastewater after chemical and biological remediation

Cited by 84 publications

References 47 publications

Effects of Bahir Dar Textile Factory Effluents on the Water Quality of the Head Waters of Blue Nile River, Ethiopia

Effects of Bahir Dar Textile Factory Effluents on the Water Quality of the Head Waters of Blue Nile River, Ethiopia

Textile dyes induce toxicity on zebrafish early life stages

Preparation of activated carbons from bio-waste: effect of surface functional groups on methylene blue adsorption

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