scholarly journals Removal of Antimony(V) from Drinking Water Using nZVI/AC: Optimization of Batch and Fix Bed Conditions

Toxics ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 266
Author(s):  
Huijie Zhu ◽  
Qiang Huang ◽  
Shuai Fu ◽  
Xiuji Zhang ◽  
Zhe Yang ◽  
...  
Keyword(s):  
Drinking Water ◽  
Removal Rate ◽  
Fixed Bed ◽  
Batch Adsorption ◽  
Negative Effects ◽  
Fixed Bed Column ◽  
Immobilization Technology ◽  
No Release ◽  
Coexisting Ions ◽  
The Ideal

Antimony (Sb) traces in water pose a serious threat to human health due to their negative effects. In this work, nanoscale zero-valent iron (Fe0) supported on activated carbon (nZVI) was employed for eliminating Sb(V) from the drinking water. To better understand the overall process, the effects of several experimental variables, including pH, dissolved oxygen (DO), coexisting ions, and adsorption kinetics on the removal of Sb(V) from the SW were investigated by employing fixed-bed column runs or batch-adsorption methods. A pH of 4.5 and 72 h of equilibrium time were found to be the ideal conditions for drinking water. The presence of phosphate (PO43-), silicate (SiO42-), chromate (CrO42-) and arsenate (AsO43-) significantly decreased the rate of Sb(V) removal, while humic acid and other anions exhibited a negligible effect. The capacity for Sb(V) uptake decreased from 6.665 to 2.433 mg when the flow rate was increased from 5 to 10 mL·min−1. The dynamic adsorption penetration curves of Sb(V) were 116.4% and 144.1% with the weak magnetic field (WMF) in fixed-bed column runs. Considering the removal rate of Sb(V), reusability, operability, no release of Sb(V) after being incorporated into the iron (hydr)oxides structure, it can be concluded that WMF coupled with ZVI would be an effective Sb(V) immobilization technology for drinking water.

scholarly journals Removal of Dyes from Wastewater of Artisanal Dyeing Plants by Adsorption in a Fixed Bed Column of Deactivated Lichens

2021 ◽  
pp. 1-11
Author(s):  
Kouassi Kouadio Dobi-Brice ◽  
Yacouba Zoungranan ◽  
Dje Daniel Yannick ◽  
Ekou Lynda ◽  
Ekou Tchirioua
Keyword(s):  
Ivory Coast ◽  
Fixed Bed ◽  
Batch Adsorption ◽  
Real Problem ◽  
Adsorption Method ◽  
Fixed Bed Column ◽  
Good Efficiency ◽  
Continuous Adsorption ◽  
Column Adsorption ◽  
Study Laboratory

Aims: Pollution by wastewaters from various urban activities such as artisanal dyeing plants is a real problem for developing countries. The treatment of wastewater by the adsorption method is carried out by means of less expensive and available adsorbent media. Two techniques of the adsorption method are possible: adsorption in continuous mode (column adsorption) and adsorption in discontinuous mode (batch adsorption). The choice of the continuous adsorption technique is justified by its ability to process large volumes of solutions. In this study, dyes contained in wastewater from artisanal dyeing plants were removed by continuous adsorption in a fixed-bed column of deactivated lichen biomass (Parmotrema dilatatum). Study Design: Random design Place and Duration of Study: Laboratory of Thermodynamics and Environmental Physico-Chemistry (University Nangui Abrogoua, Ivory Coast) between May 2020 and October 2020. Methodology: Four (4) categories of wastewater were collected in artisanal cotton and leather dyeing plants through two municipalities of the city of Abidjan, economic capital of Ivory Coast. Two (2) wastewaters colored in blue from dyeing of cotton boubous and jeans and two (2) wastewaters colored in red from dyeing of leather jackets and bags. These wastewaters were treated through the fixed bed column of deactivated lichens. The column feed rate was set at 0, 07 L.min-1 and the adsorbent bed mass at 100 g. Results: The study showed that, regardless of the nature of the dyed object and regardless of the target dye, the amount of dye adsorbed was better with waters of higher initial concentration. Thus the best amount of adsorbed dye is 44.444 mg.g-1 and the best removal rate is 97.9%. These values are obtained with the red wastewater of bags (RWB) treatment which was the most concentrated wastewater. Conclusion: Good efficiency of deactivated lichen bed as adsorbent for the in situ removal of dyes from wastewater by continuous adsorption.

scholarly journals Improvement of aqueous solution coexisting with arsenite and arsenate using iron mixed porous clay pellets in batch and fixed-bed column studies

2019 ◽  
Vol 19 (7) ◽  
pp. 1929-1937 ◽  
Author(s):  
Nguyen Chi Thanh ◽  
Boonchai Wichitsathian ◽  
Chatpet Yossapol ◽  
Watcharapol Wonglertarak ◽  
Borano Te
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Removal Rate ◽  
Fixed Bed ◽  
Polluted Water ◽  
Column Studies ◽  
Fixed Bed Column ◽  
Phosphate Ions ◽  
Pseudo Second Order ◽  
Clay Pellets

Abstract Arsenic-polluted water is a global concern and puts millions of people at risk of developing cancer. The improvement of aqueous solution coexisting with arsenite and arsenate using iron mixed porous clay pellets was investigated in batch and fixed-bed column systems. Batch studies showed that the removal rate occurred in two main phases with an equilibrium time of 52 h. The pseudo-second-order model well described the experimental data. Isotherm data were well fitted by the Langmuir–Freundlich model. The removal efficiency was significantly reduced in alkaline solution and the presence of phosphate ions. The column study revealed that the breakthrough time and saturation time increased with lower feeding flow rate, higher bed height, and lower initial adsorbate concentration. The Thomas model provided good performance for predicting the column experimental data.

scholarly journals Batch and fixed-bed column studies for selective removal of cesium ions by compressible Prussian blue/polyurethane sponge

RSC Advances ◽  
2018 ◽  
Vol 8 (64) ◽  
pp. 36459-36467 ◽  
Author(s):  
Shuquan Chang ◽  
Heliang Fu ◽  
Xian Wu ◽  
Chengcheng Liu ◽  
Zheng Li ◽  
...  
Keyword(s):  
Prussian Blue ◽  
Fixed Bed ◽  
Selective Removal ◽  
Batch Adsorption ◽  
Column Studies ◽  
Fixed Bed Column ◽  
Cesium Ions ◽  
Polyurethane Sponge

Compressible Prussian blue/polyurethane sponges for selective removal of cesium ions were prepared and detailedly studied via fixed-bed column/batch adsorption experiments.

scholarly journals Novel and highly efficient functionalized bentonite for elimination of Cu2+ and Cd2+ from aqueous wastes

2021 ◽  
Vol 27 (6) ◽  
pp. 210355-0
Author(s):  
Ralte Malsawmdawngzela ◽  
Lalhmunsiama ◽  
Diwakar Tiwari
Keyword(s):  
Background Electrolyte ◽  
Fixed Bed ◽  
Fixed Bed Column ◽  
High Sorption Capacity ◽  
Highly Efficient ◽  
Wide Range ◽  
High Sorption ◽  
The Common ◽  
Coexisting Ions ◽  
Apparent Equilibrium

The aim of this study was to synthesize novel and highly efficient functionalized material (BNMPTS) for selective elimination of Cu<sup>2+</sup> and Cd<sup>2+</sup> from aqueous waste. The detailed insights of solid/solution interactions were investigated by X-Ray photoelectron spectroscopic analyses. The grafting of silane caused for significant decrease in specific surface area of bentonite from 41.14 to 4.65 m<sup>2</sup>/g. The functionalized material possessed significantly high sorption capacity (12.59 mg/g for Cu<sup>2+</sup> and 13.19 mg/g for Cd<sup>2+</sup>) and selectivity for these cations. The material showed very high elimination efficiency at a wide range of pH ~2.0 to 7.0 for Cu<sup>2+</sup>, ~3.0 to 10.0 for Cd<sup>2+</sup> and concentration (1.0 to 25.0 mg/L) for Cu<sup>2+</sup> and Cd<sup>2+</sup>. A rapid uptake of these two cations achieved an apparent equilibrium within 60 minutes of contact. The increased level of background electrolyte concentrations (0.0001 to 0.1 mol/L) did not affect the elimination efficiency of these two cations by BNMPTS. Moreover, the common coexisting ions did not inhibit the removal of these toxic ions. Furthermore, high breakthrough volumes i.e., 1.4 and 3.69 L for Cu<sup>2+</sup>, 2.6 and 6.64 L for Cd<sup>2+</sup> was obtained using 0.25 and 0.50 g of BNMPTS respectively in a fixed-bed column operations.

scholarly journals Batch and fixed-bed column studies for the biosorption of Cu(II) and Pb(II) by raw and treated date palm leaves and orange peel

2017 ◽  
Vol 19 (3) ◽  
pp. 464-478 ◽  
Keyword(s):  
Particle Size ◽  
Flow Rate ◽  
Date Palm ◽  
Metal Removal ◽  
Fixed Bed ◽  
Orange Peel ◽  
Batch Adsorption ◽  
Fixed Bed Column ◽  
Bed Height ◽  
Adsorbent Dose

Herein, we describe the batch and fixed-bed column adsorption of Cu2+ and Pb2+ by raw and treated date palm leaves (DP) and orange peel (OP) waste biomass. Contact time, pH, adsorbent dose, and particle size were optimized in batch adsorption experiments, while breakthrough curves obtained in fixed-bed adsorption experiments were used to determine the effects of bed height, initial metal concentration, particle size, and flow rate. The use of treated DP and/or OP in batch adsorption mode increased the removal efficiency of metal ions by 20–30% compared to that observed for raw adsorbents. The equilibration time was estimated as 0.5 h, with rapid metal removal observed during the first 15 min at an optimum pH value of ~5. Increasing the adsorbent dose from 0.5 to 6–7 g enhanced the metal removal efficiency by ~60%, whereas a particle size increase from 50 to 300 µm decreased this value by about 30% for both Cu2+ and Pb2+ and both raw and treated DP/OP. Both breakthrough and exhaust times increased with increasing bed height of the fixed-bed column, and the effect observed for treated DP exceeded that observed for raw DP by a factor of two. Conversely, both breakthrough and exhaust times decreased with increasing initial metal concentration, particle size, and flow rate. Increasing the particle size from 100–150 to 300 µm changed the exhaust time by 8 h when treated DP was used for Pb2+ adsorption. The obtained linear regression coefficients (R2 = 0.9–0.99) suggest that both Thomas and Yoon–Nelson models are well-suited for predicting the adsorption performance of the present system.

Nitrogen and phosphorus removal from secondary effluent using drinking water treatment residuals fixed-bed column with intermittent operation

2014 ◽  
Vol 14 (5) ◽  
pp. 812-819
Author(s):  
Leilei Bai ◽  
Changhui Wang ◽  
Yuansheng Pei
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Fixed Bed ◽  
Drinking Water Treatment ◽  
Great Promise ◽  
Secondary Effluent ◽  
Water Treatment Residuals ◽  
Fixed Bed Column ◽  
Drinking Water Treatment Residuals ◽  
N Removal

This work aims to explore a novel intermittently operated fixed-bed column with drinking water treatment residuals (WTR) as main medium to remove nitrogen (N) and phosphorus (P) from secondary effluent under different hydraulic loading rates (HLRs). The results showed that the WTR was beneficial for N removal and the average removal efficiency reached 59%. The denitrification was the primary pathway for N removal and the denitrification rate (2.19 g N/m3 d) was higher than the theoretical value based on the organic matter removal rate (7.35 g CODcr/m3 d). The P removal was excellent and the efficiency still remained 98% after 260-day operation. The lifetime of the WTR fixed-bed column regarding P saturation was estimated to be 7.9 years under the highest HLR of 0.45 m3/m3 d. Moreover, the efficiency and stability of the nutrients removal further increased with the reduction of HLR. Based on regulations, the system holds great promise as a technology for water environment restoration and WTR recycling.

scholarly journals Removal of Molybdenum(VI) from Raw Water Using Nano Zero-Valent Iron Supported on Activated Carbon

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3162
Author(s):  
Huijie Zhu ◽  
Qiang Huang ◽  
Shuai Fu ◽  
Xiuji Zhang ◽  
Mingyan Shi ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Fixed Bed ◽  
Zero Valent Iron ◽  
Batch Adsorption ◽  
Raw Water ◽  
Adsorption Method ◽  
Fixed Bed Column ◽  
Nano Zero Valent Iron ◽  
The Impact ◽  
Harmful Effects

Traces of Molybdenum (Mo) in drinking water pose potent dangers owing to its harmful effects on the health of humans. This study used nanoscale zero-valent iron (Fe0) supported by activated carbon (NZVI/AC) for removing Mo(VI) from raw water. In an attempt to gain an understanding of the various factors that affect the process, we designed the study to look into the impact of various experimental parameters including pH, adsorption kinetics, and coexisting ions on the Mo(VI) removal using fixed-bed column runs and a batch-adsorption method and for Mo(VI) removal using NZVI/AC. The optimum conditions were found to be pH 4.5 and an equilibrium time of 9 h and 72 h for simulation water (SW) and raw water (RW), respectively. The removal of Mo(VI) was remarkably inhibited by the presence of silicate (SiO42−) and phosphate (PO43−), while the impact of humic acid and some other anions was insignificant. Metal cations such as Fe3+, Al3+, Zn2+, and Ni2+ enhanced the adsorption of Mo(VI). The influent contaminant concentration Mo(VI) in raw water was found to be 0.1603 mg/L, the empty-bed contact time (EBCT) was 3 and 6 min, whereas the breakthrough empty-bed volumes were 800 and 1100 and at the value of 70 μg/L provided by WHO provisional guidelines, respectively.

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