scholarly journals Rice Husk Biochars Modified with Magnetized Iron Oxides and Nano Zero Valent Iron for Decolorization of Dyeing Wastewater

Processes ◽  
2019 ◽  
Vol 7 (10) ◽  
pp. 660 ◽  
Author(s):  
Bao-Son Trinh ◽  
Phung T. K. Le ◽  
David Werner ◽  
Nguyen H. Phuong ◽  
Tran Le Luu
Keyword(s):  
Removal Efficiency ◽  
Rice Husk ◽  
Low Cost ◽  
Reactive Dyes ◽  
Zero Valent Iron ◽  
Color Removal ◽  
Dyeing Wastewater ◽  
Decolorization Efficiency ◽  
Nano Zero Valent Iron ◽  
Rich Material

This study investigated if biochar, a low-cost carbon-rich material, can be modified with reactive materials for decolorization of dyeing wastewater. Two types of rice husk biochars were produced by using different processes of gasification and pyrolysis in limited air condition. The biochars were first magnetized and then modified with nano-scale zero-valent iron (nZVI) to achieve the final products of magnetic-nZVI biochars. Batch experiments were conducted to investigate the efficiency of the modified biochars for reducing color of the reactive dyes yellow (RY145), red (RR195), and blue (RB19) from dyeing solutions. Results showed that color removal efficiency of the modified biochars was significantly enhanced, achieving the values of 100% for RY145 and RR195 and ≥65% for RB19, while the effectiveness of the original biochar was significantly lower. In addition, with increasing dose of the modified biochars, the color removal efficiency increased accordingly. In contrast, when the dose of nZVI was increased beyond a certain value then its color removal efficiency decreased accordingly. It is reported that the magnetic-nZVI rice husk biochars effectively removed the reactive dyes. The impregnation of nZVI particles on the biochar surface spatially separates the nZVI particles, prevents its aggregation and therefore enhances the decolorization efficiency.

scholarly journals Color removal efficiency of rice husk biochar modified with magnetized iron oxides and nano zero valent iron for decolorization of dyeing wastewater

2020 ◽  
Vol 3 (2) ◽  
pp. 105-114
Author(s):  
Bao-Son Trinh ◽  
Pham Thi Kieu Chinh ◽  
Ha Đoan Tram
Keyword(s):  
Iron Oxides ◽  
Removal Efficiency ◽  
Rice Husk ◽  
Reactive Dyes ◽  
Zero Valent Iron ◽  
Color Removal ◽  
Dyeing Wastewater ◽  
Nano Zero Valent Iron ◽  
Initial Color ◽  
Rice Husk Biochar

Rice husk biochar, a rich-carbon material, can be modified with other reactive elements to improve its original properties for organic-contaminant removal efficiency. In this study, rice husk was heated to 600 oC without air in a closed-furnace for producing the rice husk biochar (BC600). BC600 was then magnetized for making an intermediate magnetized rice husk biochar (BC600-mag). Finally, nano zero valent iron (nZVI) was synthesized on BC600-mag for producing magnetized biochar impregnated nZVI (BC600-mag-nZVI). Batch experiments were conducted to investigate color removal efficiency of BC600-mag-nZVI for the reactive dyes yellow (RY145), red (RR195) and blue (RB19) from dyeing solutions with the initial color concentrations of approximately 400 Pt-Co. Results showed that, for RY145 and RR195, the optimum color removal efficiency (ɳopt) achieved the values of 95 and 93% at doses of 0.50 and 1.50 kg BC600-mag-nZVI/m3 dyeing solution, according to the treated color decreased to 21 and 30 Pt-Co, respectively, which are lower than the allowable discharged standard of column A (≤ 50 Pt-Co) of QCVN 40:2011/BTNMT, while for RB19, the ɳopt achieved the values of 63 % at dose of 8.00 kg BC600-mag-nZVI/m3 dyeing solution, according to the treated color decreased to 147 Pt-Co which is lower than the allowable discharged standard of column B (≤ 150 Pt-Co) of QCVN 40:2011/BTNMT. In addition, with increasing dose of the modified biochars, the color removal efficiency increased accordingly, achieving almost 100% for RY145 and RR195 and over 70% for RB19. It is concluded that the magnetic-nZVI rice husk biochars effectively removed the reactive dyes. In the other hand, the impregnation of nZVI particles on the biochar backbone spatially separates the particles, prevents their aggregation and therefore enhances their reactivity This study therefore proposes a new application of rice husk biochar modified with magnetized iron oxides and zero valent iron decolorization of dyeing wastewater.

Color Removal from Dyeing Wastewater by the Polymer of Epichlorohydrin-Ethylenediamine

2013 ◽  
Vol 750-752 ◽  
pp. 1448-1451 ◽  
Author(s):  
Cui Zhen Sun ◽  
Xiao Rui Zhang ◽  
Zhi Bin Zhang ◽  
Yan Hao Zhang
Keyword(s):  
Removal Efficiency ◽  
Ferric Chloride ◽  
Reactive Dyes ◽  
Color Removal ◽  
Dyeing Wastewater ◽  
Neutralization Ability ◽  
Flocculation Process ◽  
Performance And Mechanism

A new polymer of epichlorohydrin-ethylenediamine was obtained by suspension polycondensation of ethylenediamine with epichlorohydrin. The color removal performance and mechanism of the polymer in the treatment of synthetic reactive dyes wastewater was investigated, and in comparison with polymeric aluminum ferric chloride (PAFC) and polydimethyldiallylammonium chloride (PDMDAAC). The results showed that epichlorohydrin-ethylenediamine achieved higher color removal efficiency, and its adsorption-bridging and electric neutralization ability playedimportant roles in the flocculation process.

Degradation of Azo Dyes by the Reduction and Oxidation with Nano Sized Zero Valented Iron

2007 ◽  
Vol 544-545 ◽  
pp. 705-708 ◽  
Author(s):  
B.H. Moon ◽  
Y.B. Park ◽  
Sung Su Kim ◽  
Gyu Tae Seo ◽  
T.S. Lee ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Azo Dyes ◽  
Efficient Method ◽  
Azo Dye ◽  
Zero Valent Iron ◽  
Optimum Dosage ◽  
Toc Removal ◽  
Decolorization Efficiency ◽  
Reduction And Oxidation

The objective of this study is to investigate the efficient method to maximize both color and TOC removal of the azo dye solution by reduction and oxidation with a laboratory synthesized nano-sized zero valent iron (nZVI). The decolorization efficiency increased with the decrease of pH and increase of zero valent iron dosage. The optimum dosage of nano-sized zero-valent iron was 20mg/L at pH 3. The surface normalized constant of nZVI was higher than those reported for the discoloring of azo dye with other ZVIs. The sequential dose of nZVI/H2O2 remove color and TOC more effectively than the simultaneous dose. Pre-reduction by nZVI could convert azo dye to products whose oxidation is more degradable and therefore enhances the removal efficiency.

scholarly journals The effect of different types of AOPs supported by hydrogen peroxide on the decolorization of methylene blue and viscose fibers dyeing wastewater

2021 ◽  
Author(s):  
Zeynep Bilici ◽  
Mohammed Saleh ◽  
Erdal Yabalak ◽  
Alireza Khataee ◽  
Nadir Dizge
Keyword(s):  
Hydrogen Peroxide ◽  
Removal Efficiency ◽  
Textile Industry ◽  
Subcritical Water ◽  
Color Removal ◽  
H2o2 Concentration ◽  
Dyeing Wastewater ◽  
Viscose Fibers ◽  
Different Types ◽  
Removal Efficiencies

Abstract Wastewater from the textile industry containing a high concentration of organic and inorganic chemicals have strong color and residual chemical oxygen demand (COD). Therefore, advanced oxidation processes (AOPs) are very good candidates to treat textile industry wastewater. In this study, we investigated the effect of different types of AOPs supported with hydrogen peroxide (H2O2) on the treatment of viscose fibers dyeing wastewater. Fenton, photo-Fenton, and Fenton supported subcritical water oxidation (FSWO) processes were chosen as AOPs to compare the treatment efficiency of viscose fibers dyeing wastewater. The effects of solution pH, Fe2+ concentration, and H2O2 concentration on the treatment of viscose fibers dyeing wastewater were tested. The maximum color and COD removal efficiency was obtained corresponding to pH 2.5 for all oxidation methods when MB dye solution was used. However, the maximum efficiencies were obtained at pH 3.0 for real textile wastewater decolorization. The MB dye removal efficiency was increased to 97.22, 100, and 100% for Fenton, photo-Fenton, and FSWO processes, respectively, when the addition of H2O2 concentration was adjusted to 125 mg/L. However, the maximum color removal efficiencies of viscose fibers dyeing wastewater were obtained 56.94, 61.26, 64.11% for Fenton, photo-Fenton, FSWO processes, respectively. As a result, the FSWO showed maximum color removal efficiencies.

Influence Factors on Removal of Cadmium by Montmorillonite Supported Nano Zero-Valent Iron

2013 ◽  
Vol 807-809 ◽  
pp. 539-542 ◽  
Author(s):  
Zhi Hua Pang ◽  
Yong Liu ◽  
Jun Luo ◽  
Yu Tao Lei
Keyword(s):  
Removal Efficiency ◽  
Ph Value ◽  
Influence Factors ◽  
Zero Valent Iron ◽  
Initial Concentration ◽  
Nano Zero Valent Iron ◽  
Iron Material

The montmorillonite supported nanozero-valent iron material (MT-NZVI) was synthesized to remove cadmium (Cd). The results showed that the removal efficiency of MT-NZVI on cadmium was much higher than that of montmorillonite (MT), and the removal efficiency of MT-NZVI on cadmium reduced with the increase of the initial concentration and the pH value, but increased with the increase of the dosage.

Decolorization of Reactive Brilliant Red X-3B Simulated Dye Water by Novel Coagulants

2013 ◽  
Vol 743-744 ◽  
pp. 665-668
Author(s):  
Ji Zhou Li ◽  
Xu Yin Yuan ◽  
Ming Tian ◽  
Hao Ran Ji ◽  
Wan Jiang
Keyword(s):  
Removal Efficiency ◽  
Dye Removal ◽  
Color Removal ◽  
Solution Temperature ◽  
Maximum Efficiency ◽  
Coagulant Dosage ◽  
Decolorization Efficiency ◽  
Initial Ph ◽  
Simulated Wastewater ◽  
Ph Range

Five novel coagulants, DC-491, Fennofix K97, BWD-01, MD-03 and MD-04 were chosen to treat reactive brilliant red X-3B simulated wastewater by jar tests. The results showed that the decolorization efficiencies were all higher than 75% at initial pH 8.2 and temperature 20 after 20 minutes of reaction. Then, two typical coagulants, BWD-01 and MD-04 which had better performance were chosen to study the effect of dye removal of X-3B at different operating parameters, including coagulant dosage, pH, sedimentaion time and reaction temperature of simulated wastewater. Decolorization efficiency of MD-04 for X-3B solution was higher than 80% in pH range from 3 to 9, while for BWD-01, efficiency increased from 37.3% to 82.3% in this pH range. For both BWD-01 and MD-04, the color removal efficiency increased as the solution temperature increased and the maximum efficiency was over 94% at 40. Small changes in the color removal efficiency were observed after 1 hour sedimentation for both coagulants.

scholarly journals Klebsiella and Enterobacter Isolated from Mangrove Wetland Soils in Thailand and Their Application in Biological Decolorization of Textile Reactive Dyes

2020 ◽  
Vol 17 (20) ◽  
pp. 7531
Author(s):  
Aiya Chantarasiri
Keyword(s):  
Soil Bacteria ◽  
Reactive Dyes ◽  
Wetland Soils ◽  
Dyeing Wastewater ◽  
Experimental Conditions ◽  
Reactive Blue 19 ◽  
Mangrove Wetlands ◽  
Alternative Approach ◽  
Decolorization Efficiency ◽  
Reactive Red 195

Wastewater released from textile and dye-based industries is one of the major concerns for human and aquatic beings. Biological decolorization using ligninolytic bacteria has been considered as an effective and alternative approach for the treatment of dyeing wastewater. This study aimed to assess the isolation, characterization and application of soil bacteria isolated from mangrove wetlands in Thailand. Four active bacteria were genetically identified and designated as Klebsiella pneumoniae strain RY10302, Enterobacter sp. strain RY10402, Enterobacter sp. strain RY11902 and Enterobacter sp. strain RY11903. They were observed for ligninolytic activity and decolorization of nine reactive dyes under experimental conditions. All bacteria exhibited strong decolorization efficiency within 72 h of incubation at 0.01% (w/v) of reactive dyes. The decolorization percentage varied from 20% (C.I. Reactive Red 195 decolorized by K. pneumoniae strain RY10302) to 92% (C.I. Reactive Blue 194 decolorized by Enterobacter sp. strain RY11902) in the case of bacterial monoculture, whereas the decolorization percentage for a mixed culture of four bacteria varied from 58% (C.I. Reactive Blue 19) to 94% (C.I. Reactive Black 1). These findings confer the possibility of using these bacteria for the biological decolorization of dyeing wastewater.

Water Treatment by the Bipolar Pulsed Dielectric Barrier Discharge (DBD) in Water-Air Mixture

2004 ◽  
Vol 7 (2) ◽  
Author(s):  
Zhang Ruo-Bing ◽  
Wu Yan ◽  
Li Jie ◽  
Li Guo-Feng ◽  
Li Teng-Fei ◽  
...  
Keyword(s):  
Water Treatment ◽  
Removal Efficiency ◽  
Gas Flow ◽  
Barrier Discharge ◽  
Indigo Carmine ◽  
Color Removal ◽  
Gas Flow Rate ◽  
Dielectric Barrier ◽  
Decolorization Efficiency ◽  
Solution Conductivity

AbstractResults obtained using a bipolar pulsed DBD reactor for Indigo Carmine (IC) water treatment are reported in this investigation. Effects of such parameters as gas flow rate, solution conductivity, pulse repetitive rate and ect., on color removal efficiency of IC solution were studied. The results showed that color removal efficiency was greatly enhanced by bubbling air into the reactor. Decolorization efficiency of the reactor increased with the increase of the pulse repetitive rate, decreased with the increase of the initial solution conductivity and gap distance. In addition, concentrations of ozone in the effluent gases and hydroxyl peroxide in the aqueous phase were determined and their functions on the decolorization were analyzed.

scholarly journals Remediation of Lead and Nickel Contaminated Soil Using Nanoscale Zero-Valent Iron (nZVI) Particles Synthesized Using Green Leaves: First Results

Processes ◽  
2020 ◽  
Vol 8 (11) ◽  
pp. 1453
Author(s):  
Nimita Francy ◽  
Subramanian Shanthakumar ◽  
Fulvia Chiampo ◽  
Yendaluru Raja Sekhar
Keyword(s):  
Electron Microscope ◽  
Removal Efficiency ◽  
Contaminated Soil ◽  
Low Cost ◽  
Zero Valent Iron ◽  
Lead Removal ◽  
Green Leaves ◽  
Neem Leaves ◽  
Nanoscale Zero Valent Iron ◽  
First Results

Nanoscale zero-valent iron (nZVI) particles have proved to be effective in the remediation of chlorinated compounds and heavy metals from contaminated soil. The present study aimed to analyze the performance of nanoparticles synthesized from low-cost biomass (green leaves) as chemical precursors, namely Azadirachta indica (neem) and Mentha longifolia (mint) leaves. These leaves were chosen because huge amounts of them are present in the region of Vellore. These nanoparticles were used to remove lead and nickel from contaminated soil. Characterization of nZVI particles was conducted using the Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), and Brunauer–Emmett–Teller isotherm (BET) techniques. Remediation was performed on two different soil samples, polluted with lead or nickel at an initial metal concentration around 250 mg/kg of soil. The results revealed that after 30 days, the lead removal efficiency with 0.1 g of nZVI particles/kg of soil was 26.9% by particles synthesized using neem leaves and 62.3% by particles synthesized using mint leaves. Similarly, nickel removal efficiency with 0.1 g of particles/kg of soil was 33.2% and 50.6%, respectively, by particles using neem and mint leaves. When the nanoparticle concentration was doubled, Pb and Ni removal improved, with similar trends obtained at a lower dosage (0.1 g of particles/kg of soil). These first results evidenced that: (1) the nZVI particles synthesized using green leaves had the potential to remove Pb and Ni from contaminated soil; (2) the neem-derived particles gave better Ni removal efficiency than Pb one; (3) the mint-derived particles showed better Pb removal efficiency than Ni one; (4) the highest removal efficiency for both metals was achieved with the mint-derived particles; (5) double higher dosage did not greatly improve the results.

Sign in / Sign up

Export Citation Format

Share Document