Simultaneous copper, cobalt and phenol removal from aqueous solutions by alternating biosorption and biodegradation

2011 ◽  
Vol 63 (10) ◽  
pp. 2388-2394 ◽  
Author(s):  
K. Tsekova ◽  
S. Ganeva ◽  
A. Hristov ◽  
D. Todorova ◽  
V. Beschkov
Keyword(s):  
Aqueous Solutions ◽  
Poly Vinyl Alcohol ◽  
Phenol Removal ◽  
Batch Experiments ◽  
Phenol Biodegradation ◽  
Candida Sp ◽  
Cobalt Removal ◽  
Removal Of Heavy Metals ◽  
Removal Efficiencies ◽  
Positively Charged

A strategy for removal of heavy metals and phenol from wastewaters is proposed. It involves consecutive cation biosorption by fungi, phenol biodegradation by the yeast association Candida sp. 2326 + Candida sp. 2327 and regeneration. Copper and cobalt removal from aqueous solutions containing 80–120 mg/L phenol by biosorption, using Rhizopus archizus cells immobilized onto poly(vinyl alcohol), was investigated by conducting a series of batch experiments. The removal efficiencies were 81% for Cu and 5% for Co. The residual concentrations of Cu (1.9 mg/L) and of Co (9.5 mg/L) did not change the biodegradation dynamics of phenol. A quantitative biodegradation of 120 mg/L phenol proceeded within 22 h. After biodegradation of phenol, the removal efficiencies achieved by biosorption after regeneration were 90% for Cu and 44% for Co. It was found that copper and cobalt form positively charged complexes with phenol. This complex formation hinders the retention of Cu and Co by the biosorbent and reduces the uptake of their cations.

scholarly journals Effect of Dissolved Silicon on the Removal of Heavy Metals from Aqueous Solution by Aquatic Macrophyte Eleocharis acicularis

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 940 ◽  
Author(s):  
Ha T.H. Nguyen ◽  
Masayuki Sakakibara ◽  
Minh N. Nguyen ◽  
Nhuan T. Mai ◽  
Vinh T. Nguyen
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions ◽  
Metal Toxicity ◽  
Laboratory Experiments ◽  
Aquatic Macrophyte ◽  
Scale Up ◽  
Simultaneous Removal ◽  
Removal Of Heavy Metals ◽  
Removal Efficiencies ◽  
Dissolved Silicon

Silicon (Si) has been recently reconsidered as a beneficial element due to its direct roles in stimulating the growth of many plant species and alleviating metal toxicity. This study aimed at validating the potential of an aquatic macrophyte Eleocharis acicularis for simultaneous removal of heavy metals from aqueous solutions under different dissolved Si. The laboratory experiments designed for determining the removal efficiencies of heavy metals were conducted in the absence or presence of Si on a time scale up to 21 days. Eleocharis acicularis was transplanted into the solutions containing 0.5 mg L−1 of indium (In), gallium (Ga), silver (Ag), thallium (Tl), copper (Cu), zinc (Zn), cadmium (Cd), and lead (Pb) with various Si concentrations from 0 to 4.0 mg L−1. The results revealed that the increase of dissolved Si concentrations enhanced removal efficiencies of E. acicularis for Ga, Cu, Zn, Cd, and Pb, while this increase did not show a clear effect for In, Tl, and Ag. Our study presented a notable example of combining E. acicularis with dissolved Si for more efficient removals of Cu, Zn, Cd, Pb, and Ga from aqueous solutions. The findings are applicable to develop phytoremediation or phytomining strategy for contaminated environment.

scholarly journals Efficient removal of heavy metals from melting effluent using multifunctional hydrogel adsorbents

2018 ◽  
Vol 78 (4) ◽  
pp. 982-990 ◽  
Author(s):  
Jianhong Ma ◽  
Yuanmeng Zhang ◽  
Yanhong Tang ◽  
Yuanfeng Wei ◽  
Yutang Liu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Mechanical Strength ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
High Water ◽  
Poly Vinyl Alcohol ◽  
Removal Of Heavy Metals ◽  
Cross Linkage ◽  
Removal Efficiencies

Abstract It is hard to balance high water permeability and good mechanical strength of hydrogel adsorbents. In this study, an enhanced double network hydrogel adsorbent of poly (vinyl alcohol)/poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PVA/PAMPS) was prepared via simple free-radical polymerization. Hydrophilic PAMPS guaranteed high swellability of the adsorbent, which made the sufficient diffusion of metal ions towards adsorbent inside. Meanwhile, the cross-linkage between PVA and PAMPS chains ensured good mechanical strength of the adsorbent. Significantly, the introduction of multifunctional groups (-NHR, -SO3H and -OH) endowed the adsorbent with both chelation and ion exchange function for enhancing heavy metal adsorption. The maximum adsorption capacities of Pb2+ and Cd2+ reached 340 and 155.1 mg/g, respectively. The adsorbent could efficiently remove heavy metals in melting effluent, especially Pb2+ and Cd2+. The removal efficiencies reached 88.1% for Pb2+, 91.4% for Cd2+, 70.4% for Zn2+, 77.4% for Cu2+, 42.5% for Mn2+, 45.1% for Ni2+ and 95.4% for Fe3+ using 2 g/L adsorbent in 2 h. Moreover, the adsorbent showed a good reusability, and the removal efficiencies maintained 94% for Pb2+ and 93% for Cd2+ in the fifth cycle (m/V = 1 g dry gel/L). This work developed a highly practical hydrogel adsorbent for heavy metal removal from wastewater.

Immobilization of halophilic yeast for effective removal of phenol in hypersaline conditions

2017 ◽  
Vol 77 (3) ◽  
pp. 706-713 ◽  
Author(s):  
Yu Jiang ◽  
Kai Yang ◽  
Tao Deng ◽  
Bin Ji ◽  
Yu Shang ◽  
...  
Keyword(s):  
Immobilized Cells ◽  
Phenol Degradation ◽  
Phenol Removal ◽  
Phenol Biodegradation ◽  
Nano Sio2 ◽  
Candida Sp ◽  
Halotolerant Yeast ◽  
Effective Removal ◽  
Degradation Rates ◽  
Effects Of Ph

Abstract A halotolerant yeast strain of Candida sp. was purified for phenol biodegradation and was immobilized in alginate and nano-SiO2. The concentration of nanoscale SiO2 was optimized and phenol degradation performance with different initial phenol concentrations was evaluated. Three common kinetic models were used to correlate the experimental data. The effects of pH and salinity on phenol biodegradation were also investigated. It was found that 1.0% (w/v) was the optimal nano-SiO2 concentration and the immobilized cells had a better phenol removal performance compared to free cells. More than 99% of 600 mg l−1 phenol was removed by the immobilized strains within 48 h. The immobilized cells also showed highest phenol degradation rates when pH and salinity were 6.5 and 0%, respectively. The high removal efficiency of phenol in reusability tests indicated the promising application of the immobilized Candida strain in phenol degradation under hypersaline conditions over a long period.

scholarly journals REMOVAL OF HEAVY METALS (CU, NI, ZN, PB, CD) FROM COMPOST BY MOLASSES HYDROLYSATE

2014 ◽  
Vol 22 (4) ◽  
pp. 301-310 ◽  
Author(s):  
Emine Elmaslar ÖZBAŞ ◽  
Nilgün BALKAYA
Keyword(s):  
Heavy Metals ◽  
Sugar Industry ◽  
Low Ph ◽  
Batch Experiments ◽  
Liquid Ratio ◽  
Experimental Conditions ◽  
Removal Of Heavy Metals ◽  
Removal Efficiencies ◽  
Solid Liquid ◽  
Total P

This study aimed to remove heavy metals (Cu, Ni, Zn, Pb, Cd) from composts using molasses hydrolysate, produced from molasses by-product of the sugar industry. Batch experiments were conducted to examine the effects of differing experimental conditions on the removal of heavy metals, according to contact time and solid–liquid ratio. Batch experiments achieved removal efficiencies of 66% for Cu(II), 52% for Ni(II), 57% for Zn(II), 51% for Pb (II), and 77% for Cd(II) at 60 minutes and 1:12.5 solid–liquid ratio. Column experiments achieved removal efficiencies of 91% for Cu, 86% for Ni, 99% for Zn, 61% for Pb, and 99% for Cd at 0.55 mL/minute flow rate and a solid–liquid ratio of 1:12.5 g/mL. Producing large quantities of highly acidic and heavy metal contaminated solution, compost with low pH, and decreasing some parameters’ concentrations of compost such as C, TKN, total P are the disadvantages of suggested technology.

scholarly journals Simultaneous removal of heavy metals from aqueous solutions by Equisetum diffusum D. Don

2019 ◽  
Vol 41 (2) ◽  
pp. 130-137
Author(s):  
Nguyen Thi Hoang Ha ◽  
Vu Thi Thom
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions ◽  
Laboratory Experiment ◽  
Removal Efficiency ◽  
Bioconcentration Factor ◽  
Plant Roots ◽  
Simultaneous Removal ◽  
Removal Of Heavy Metals ◽  
Removal Efficiencies ◽  
Multiple Heavy Metals

Equisetum diffusum D. Don was transplanted into solutions added with different concentrations of Mn, Zn, Cd, Pb, and As for 30 days in the laboratory experiment to assess the removal of these metals and their accumulation in the plant. The highest removal efficiency of Mn, Zn, Cd, Pb, and As from solutions by E. diffusum was 99.6, 97.9, 77.5, 85.3, and 61.9%, respectively. The highest daily removal efficiencies of heavy metals were obtained after 1 day of new solution addition. The highest concentrations of Mn, Zn, Cd, Pb, and As in the plant roots were 7230, 1490, 174, 1170, and 274 mg/kg-DW, respectively; those in the shoots were 1960, 566, 33.9, 308, and 108 mg/kg-DW. The bioconcentration factor (BCF) values for Mn, Zn, Cd, Pb, and As were 496, 406, 702, 463, and 191, respectively. The results of this study indicate that E. diffusum has the ability to remove simultaneously these metals from water, making it a potential species for phytoremediation of water contaminated with multiple heavy metals.  

Flow-induced crystalline precursors in entangled Poly(vinyl alcohol) aqueous solutions

Polymer ◽  
2021 ◽  
pp. 123960
Author(s):  
Chang Liu ◽  
Xinhong Yu ◽  
Yinghan Li ◽  
Xinyue Zhao ◽  
Quan Chen ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol
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