Combining strains of lactic acid bacteria may reduce their toxin and heavy metal removal efficiency from aqueous solution

This work aims to evaluate the effectiveness of fly ash based geopolymer powder as an adsorbent for heavy metals in aqueous solution. The structure of synthesized geopolymer was found to be highly amorphous due to the dissolution of fly ash phase. Moreover, the fly ash geopolymer powder has higher surface area compares to original fly ash with specific surface area of 85.01 m²/g and 0.83 m2/g, respectively. For this reason, the geopolymer powder has much higher removal efficiency compared to the original fly ash powder. The removal efficiency was affected by contact time, geopolymer amount, heavy metal initial concentration, pH, and temperature. The four heavy metals were chosen (Pb2+, Cu2+, Ni2+, Cd2+) for adsorption test. The highest heavy metal removal capacity was obtained at pH 5. The geopolymer powder adsorbed metal cations in the order of Pb2+>Cu2+>Cd2+>Ni2+. In addition, Langmuir model is more suitable for fly ash geopolymer powder adsorption of heavy metal ions in aqueous solution than Freundlich model. The results showed that the fly ash geopolymer powder has high efficiency for removal metal which could be employed excellent alternative for wastewater treatment.

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Electrokinetic Remediation of Heavy Metal Contaminated Soil Using Permeable Reactive Composite Electrodes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.518-523.361 ◽

2012 ◽

Vol 518-523 ◽

pp. 361-368 ◽

Cited By ~ 3

Author(s):

Rong Bing Fu ◽

Xin Xing Liu ◽

Fang Liu ◽

Jin Ma ◽

Yu Mei Ma ◽

...

Keyword(s):

Heavy Metal ◽

Metal Ions ◽

Removal Efficiency ◽

Heavy Metal Ions ◽

Metal Removal ◽

Heavy Metal Removal ◽

Ph Control ◽

Electrokinetic Remediation ◽

Composite Electrodes ◽

Remediation Process

A new permeable reactive composite electrode (PRCE) attached with a permeable reactive layer (PRL) of Fe0 and zeolite has been developed for soil pH control and the improved removal efficiency of heavy metal ions (Cd, Ni, Pb, Cu) from soil in electrokinetic remediation process. The effects of different composite electrodes on pH control and heavy metal removal efficiency were studied, and changes in the forms of heavy metals moved onto the electrodes were analyzed. The results showed that with acidic/alkaline zeolite added and renewed in time, the composite electrodes could effectively neutralize and capture H+ and OH- produced from electrolysis of the anolyte and catholyte, avoiding or delaying the formation of acidic/alkaline front in tested soil, preventing premature precipitation of heavy metal ions and over-acidification of soil, and thus significantly improved the heavy metal removal efficiency. Fe0 in composite electrodes could deoxidize and stabilize the heavy metal ions. After that capture and immobilization of the pollutants were achieved. The results also showed that, using "Fe0 + zeolite" PRCE in the cathode with timely renewal, after 15-day remediation with a DC voltage of 1.5 V/cm, the total removal rates of Cd, Pb, Cu and Ni were 49.4%, 47.1%, 36.7% and 39.2%, respectively.

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AI ON A CHIP FOR IDENTIFYING MICROALGAL CELLS WITH HIGH HEAVY METAL REMOVAL EFFICIENCY

2021 21st International Conference on Solid-State Sensors, Actuators and Microsystems (Transducers) ◽

10.1109/transducers50396.2021.9495554 ◽

2021 ◽

Author(s):

Muzhen Xu ◽

Jeffrey Harmon ◽

Tomohisa Hasunuma ◽

Akihiro Isozaki ◽

Keisuke Goda

Keyword(s):

Heavy Metal ◽

Removal Efficiency ◽

Metal Removal ◽

Heavy Metal Removal

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Growth and metal removal efficiency of the green algae Schroederia setigera and Selenastrum bibraianum exposed to nickel, zinc and cadmium

Vietnam Journal of Science and Technology ◽

10.15625/2525-2518/58/5a/15183 ◽

2020 ◽

Vol 58 (5A) ◽

pp. 22

Author(s):

Dao Thanh Son ◽

Van Tai Nguyen ◽

Thuy Nhu Quynh Vo ◽

Vinh Quang Tran ◽

Thi My Chi Vo ◽

...

Keyword(s):

Heavy Metal ◽

Green Algae ◽

Removal Efficiency ◽

Heavy Metal Contamination ◽

Metal Removal ◽

Heavy Metal Removal ◽

Pilot Scale ◽

Nickel Zinc ◽

Ecological Protection

Heavy metal contamination is among the globally environmental and ecological concerns. In this study we assessed the development of the two green algae Schroederia setigera and Selenastrum bibraianum under exposures to 5 – 200 µg/L of Ni, Zn, and Cd in the laboratory conditions. Heavy metal removal efficiency of S. setigera was also tested in 537 µg Ni/L, 734 µg Zn/L, and 858 µg Cd/L. We found that the exposures with these heavy metals caused inhibitory on the growth of S. bibraianum. The S. bibraianum cell size in the 200 µg Zn/L treatment was around two times smaller than the control. However, Zn and Cd at the concentration of 200 µg/L did not inhibit the growth of S. setigera over 18 days of exposure. The S. setigera also grew well during 8 days exposed to Ni at the same concentration. Besides, the alga S. setigera could remove 66% of Zn, 18% of Cd and 12% of Ni out of the test medium after 16 days of incubation. The Vietnam Technical Regulation related to metals should be considered for ecological protection. We recommend to test the metal removal by the alga S. setigera at pilot scale prior to apply it in situ

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Synthesis, Characterization, and Applications of Silk/Bentonite Clay Composite for Heavy Metal Removal From Aqueous Solution

Frontiers in Chemistry ◽

10.3389/fchem.2019.00654 ◽

2019 ◽

Vol 7 ◽

Cited By ~ 7

Author(s):

Nasira Wahab ◽

Muhammad Saeed ◽

Muhammad Ibrahim ◽

Akhtar Munir ◽

Muhammad Saleem ◽

...

Keyword(s):

Aqueous Solution ◽

Heavy Metal ◽

Metal Removal ◽

Heavy Metal Removal ◽

Bentonite Clay

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Heavy-metal removal from aqueous solution by fungus Mucor rouxii

Water Research ◽

10.1016/s0043-1354(03)00409-3 ◽

2003 ◽

Vol 37 (18) ◽

pp. 4486-4496 ◽

Cited By ~ 363

Author(s):

Guangyu Yan ◽

Thiruvenkatachari Viraraghavan

Keyword(s):

Aqueous Solution ◽

Heavy Metal ◽

Metal Removal ◽

Heavy Metal Removal ◽

Mucor Rouxii

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Removal of Some Heavy Metals by Electrocoagulation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.468-471.2882 ◽

2012 ◽

Vol 468-471 ◽

pp. 2882-2890 ◽

Cited By ~ 3

Author(s):

R. H. Al Anbari ◽

S. M. Alfatlawi ◽

J. H. Albaidhani

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Removal Efficiency ◽

Metal Removal ◽

Heavy Metal Removal ◽

Efficient Treatment ◽

Electrolytic Cells ◽

Removal Capacity ◽

Metals Removal ◽

Working Parameters

Heavy metal removal by electrocoagulation using iron electrodes material was investigated in this paper. Several working parameters, such as pH, current density and heavy metal ions concentration were studied in an attempt to achieve a higher removal capacity. A simple and efficient treatment process for removal of heavy metals is essentially necessary. The performance of continuous flow electrocoagulation system, with reactor consists of a ladder series of twelve electrolytic cells, each cell containing stainless steel cathode and iron anode. The treatment of synthetic solutions containing Zn 2+,Cu 2+,Ni 2+,Cr 3+,Cd 2+ and Co 2+ ,has been investigated. Results showed that iron is very effective as sacrificial electrode material for heavy metals removal efficiency and cost points. Also it was concluded that the chromium has lower efficient removal as compared to zinc, copper and nickel. At the same time cadmium and cobalt have minimum removal efficiency.

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