Phycoremediation of Chromium (VI) by Nitella and impact of calcium encrustation

Gomes, Pattiyage I. A.; Asaeda, Takashi

doi:10.1016/j.jhazmat.2008.12.055

Cited by 41 publications

(11 citation statements)

References 21 publications

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“…The temperature was set at 23¡ 2 xC, and light was provided by fluorescence bulbs with a 12 h light/12 h dark photoperiod and light intensity ranging from 240 to 270 mmol m x2 s x1 . The pH of the medium was in the range of 7.3 ¡ 0.1 (Gomes and Asaeda, 2009). The experimental setup consisted of four microcosms.…”

Section: Methodsmentioning

confidence: 99%

“…The sediment added micronutrients to the growth media and supported plant anchorage. Water column nutrients were maintained at concentrations of 0.3 mg L x1 nitrate and 0.1 mg L x1 phosphate and 10.0 mg L x1 dissolved inorganic carbon (DIC) by using NaNO 3 , K 2 HPO 4 and NaHCO 3 (Wako Chemicals, Tokyo, Japan), respectively, for adjustments (Gomes and Asaeda, 2009). DIC, nitrate and phosphate concentrations in water were measured weekly and adjusted accordingly.…”

Section: Generation Of Turbulence and Its Quantificationmentioning

confidence: 99%

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The effect of flow turbulence on growth, nutrient uptake and stable carbon and nitrogen isotope signatures inChara fibrosa

Ellawala

Asaeda

Kawamura

2012

Ann. Limnol. - Int. J. Lim.

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-Exposure to water movement has been observed to alter various processes in the plants including growth, hormone concentration and nutrient uptake. In the current study, Chara fibrosa was exposed to three different turbulence conditions and compared with a control. Turbulence was generated in the laboratory by using a vertically oscillating grid setup. Exposure to turbulence caused a reduction in shoot length and nutrient uptake in C. fibrosa. Variation of stable isotope composition was measured as a surrogate variable that is able to integrate variations of many physiological processes. It was initially hypothesized that the reduction of diffusion boundary layer around the plant will increase isotopic discrimination against 13 C and 15 N, when exposed to increasing turbulence. Although the results generally agree with the hypothesis, a trend of increment was observed in d 13 C in the plants exposed to turbulent velocities from 0.46 to 1.93 cm s x1 , against the hypothesis. Mechanical stress induced reduction of carbon uptake and lipid peroxidation due to the development of oxidative stress may be the reasons behind the above-mentioned trend. The study exhibits that the net effect of physical and physiochemical changes of the plants was displayed in d 13 C signatures and it is important to consider physical conditions of the local environment, in using stable isotope signatures for ecosystem studies.

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Section: Methodsmentioning

confidence: 99%

Section: Generation Of Turbulence and Its Quantificationmentioning

confidence: 99%

The effect of flow turbulence on growth, nutrient uptake and stable carbon and nitrogen isotope signatures inChara fibrosa

Ellawala

Asaeda

Kawamura

2012

Ann. Limnol. - Int. J. Lim.

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“…The adverse effects of Cr on plant height and shoot growth have been reported in different plant species. In a laboratory experiment, Gomes and Asaeda [6] observed that Cr(VI) addition at 200 and 400 μg L −1 concentrations inhibited the growth of Nitella pseudoflabellata. Shanker et al [9] noted 11%, 22%, and 41% reductions in plant height over the control when Cr was added at 2, 10, and 25 mg L −1 to nutrient solutions in sand cultures with oats, respectively.…”

Section: Effects Of Metals On Plant Growthmentioning

confidence: 98%

“…Apart from their role in trophic systems, heavy metal uptake and accumulation have been established in numerous freshwater green algae [3]. Recent studies have focused on the use of some macro-algae as a biosorbent material for removing metals from solutions, demonstrating their potential application in technological processes; in particular, for industrial and mining waste treatments [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Effects of Cd, Cr, and Zn on growth and metal accumulation in an aquatic macrophyte,Nitella graciliformis

Bibi¹,

Asaeda²,

Azim³

2010

Chemistry and Ecology

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The effect of heavy metals (Cd, Cr, and Zn) on the growth of the freshwater macrophytic Nitella graciliformis J. was observed under laboratory conditions and their accumulations in the plant were measured. The experimental plant was exposed to three different concentrations of Cd (25, 50, 150 μg L −1 ), Cr (150, 500, 1000 μg L −1 ), and Zn (150, 500, 1000 μg L −1 ) for 35 days. The heavy metal concentrations in the plant increased with the increasing Cd, Cr, and Zn concentrations in the mediums. The highest concentration of Zn that accumulated in the plant tissues was 2540 μg g −1 Zn at 1000 μg L −1 medium compared to 547 μg g −1 Cr at 1000 μg L −1 and 290 μg g −1 Cd at 150 μg L −1 mediums. As a result, negative growth occurred and the internode elongation was reduced when exposed to these metals at any concentration. We concluded that under experimental conditions, intracellular green alga Nitella graciliformis has a potential for accumulating Cd, Cr, and Zn.

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“…Nitella sp. can also be effectively used to remediate Cr(VI) contaminated water either passively or actively in wetland systems, depending upon the concentration of Cr(VI) (Gomes and Asaeda 2009). Various cyanobacterial species ( Nostoc muscorum , Spirulina platensis and Aphanothece flocculosa ) have shown the biosorption ability towards metal ions (Cu 2+ , Cd 2+ , Cr 3+ , Cr 6+ , Co 2 + , Ni 2+ and Fe 3+ ) (Zinicovscaia and Cepoi 2016).…”

Section: Application Of Photoautotrophic Microorganisms—case Studiesmentioning

confidence: 99%

Photoautotrophic microorganisms and bioremediation of industrial effluents: current status and future prospects

et al. 2017

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Growth of the industrial sector, a result of population explosion has become the root cause of environmental deterioration and has raised the concerns for efficient wastewater management and reuse. Photoautotrophic cultivation of microorganisms is a boon and considered as a potential biological treatment for remediation of wastewater as it sequesters CO2 during growth. Photoautotrophs viz. cyanobacteria, micro-algae and macro-algae can photosynthetically assimilate the excessive pollutants present in the wastewater. The present review emphasizes on the achievability of microorganisms to bestow wastewater as the nutrient source for biomass production, which can further be reused for feed, food and fertilizers. To support this, various case studies have been cited that prove phycoremediation as a cost-effective and sustainable process over conventional wastewater treatment processes that requires high chemical load and more energy inputs.

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Phycoremediation of Chromium (VI) by Nitella and impact of calcium encrustation

Cited by 41 publications

References 21 publications

The effect of flow turbulence on growth, nutrient uptake and stable carbon and nitrogen isotope signatures inChara fibrosa

The effect of flow turbulence on growth, nutrient uptake and stable carbon and nitrogen isotope signatures inChara fibrosa

Effects of Cd, Cr, and Zn on growth and metal accumulation in an aquatic macrophyte,Nitella graciliformis

Photoautotrophic microorganisms and bioremediation of industrial effluents: current status and future prospects

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