Removal of Cu(II) in fixed bed and batch reactors using natural zeolite and exfoliated vermiculite as adsorbents

Catalytic wet peroxide oxidation (CWPO) is emerging as an advanced oxidation process (AOP) of significant promise, which is mainly due to its efficiency for the decomposition of recalcitrant organic compounds in industrial and urban wastewaters and relatively low operating costs. In current study, we have systemised and critically discussed the feasibility of CWPO for industrial and urban wastewater treatment. More specifically, types of catalysts the effect of pH, temperature, and hydrogen peroxide concentrations on the efficiency of CWPO were taken into consideration. The operating and maintenance costs of CWPO applied to wastewater treatment and toxicity assessment were also discussed. Knowledge gaps were identified and summarised. The main conclusions of this work are: (i) catalyst leaching and deactivation is one of the main problematic issues; (ii) majority of studies were performed in semi-batch and batch reactors, while continuous fixed bed reactors were not extensively studied for treatment of real wastewaters; (iii) toxicity of wastewaters treated by CWPO is of key importance for possible application, however it was not studied thoroughly; and, (iv) CWPO can be regarded as economically viable for wastewater treatment, especially when conducted at ambient temperature and natural pH of wastewater.

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Adsorption of Methylene Blue from Solution by Natural Zeolite in Fixed-Bed Column: Effect of Bed Depth

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.518-523.3115 ◽

2012 ◽

Vol 518-523 ◽

pp. 3115-3119

Author(s):

Yan Qiang Li ◽

Xiao Feng Ren ◽

Shao Hua Chen ◽

Xiu Rong Zhao ◽

Run Ping Han

Keyword(s):

Methylene Blue ◽

Natural Zeolite ◽

Fixed Bed ◽

Breakthrough Curves ◽

Form Solution ◽

Column Height ◽

Nonlinear Regression Analysis ◽

Adsorption Ability ◽

Fixed Bed Column ◽

Linear And Nonlinear

The effect of bed depth on adsorption ability of natural zeolite to removal methylene blue (MB) from aqueous solution in the fixed-bed column was studied. The results showed that the increase in column height favored the MB removal form solution. The equilibrium uptake of MB onto unit mass zeolite increased with the bed depth growth. The experimental data were fitted to Yan model using linear and nonlinear regression analysis, respectively. The experimental points and the predicted curves using the Yan model were compared and the error analysis was performed. The results indicated that Yan model were good to predict the breakthrough curves and both two methods can be used to obtain the parameters of Yan model and to predict the breakthrough curves.

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Uptake of Pb and Zn from a binary solution onto different fixed bed depths of natural zeolite – the BDST model approach

Clay Minerals ◽

10.1180/claymin.2015.050.1.09 ◽

2015 ◽

Vol 50 (1) ◽

pp. 91-101 ◽

Cited By ~ 4

Author(s):

I. Nuić ◽

M. Trgo ◽

J. Perić ◽

N. Vukojević Medvidović

Keyword(s):

Natural Zeolite ◽

Binary Systems ◽

Binary Solution ◽

Fixed Bed ◽

Breakthrough Curves ◽

Design Parameters ◽

Bdst Model ◽

Column System ◽

Lead And Zinc ◽

Model Approach

AbstractThe removal of lead and zinc from a binary solution by fixed bed depths (40, 80 and 120 mm) of a natural zeolite was examined at a flow rate of 1 mL/min. The results obtained were fitted to the Bed Depth Service Time (BDST) model and the parameters of the model (q and k) were used to design a column system for flow rates of 2 and 3 mL/min at a bed depth of 80 mm. The experimental results were in excellent agreement with those predicted and experimental breakthrough curves for the binary systems were obtained. This approach facilitates the design of effective binary column processes without additional experimentation. Two major design parameters, the Empty Bed Contact Time (EBCT) and the zeolite usage rate, were calculated. The highest EBCT value of 13.56 min represents the optimal conditions for the binary (Pb+Zn) solution.

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An innovative dual-column system for heavy metallic ion sorption by natural zeolite

10.32920/14637429.v1 ◽

2021 ◽

Author(s):

Amanda L. Ciosek ◽

Grace K. Luk

Keyword(s):

Natural Zeolite ◽

Mine Drainage ◽

Technology Development ◽

Fixed Bed ◽

Contact Period ◽

Metallic Ions ◽

Treatment Technology ◽

Sorption System ◽

Column System ◽

In Series

This study investigates the design and performance of a novel sorption system containing natural zeolite. The apparatus consists of packed, fixed-bed, dual-columns with custom automated controls and sampling chambers, connected in series and stock fed by a metering pump at a controlled adjustable distribution. The purpose of the system is to remove heavy metallic ions predominately found in acid mine drainage, including lead (Pb2+), copper (Cu2+), iron (Fe3+), nickel (Ni2+) and zinc (Zn2+), combined in equal equivalence to form an acidified total 10 meq/L aqueous solution. Reported trends on the zeolite’s preference to these heavy metallic ions is established in the system breakthrough curve, as Pb2+ >> Fe3+ > Cu2+ > Zn2+ >> Ni2+. Within a 3-h contact period, Pb2+ is completely removed from both columns. Insufficient Ni2+ removal is achieved by either column with the promptest breakthrough attained, as zeolite demonstrates the least affinity towards it; however, a 48.97% removal is observed in the cumulative collection at the completion of the analysis period. The empty bed contact times for the first and second columns are 20 and 30 min, respectively; indicating a higher bed capacity at breakthrough and a lower usage rate of the zeolite mineral in the second column. This sorption system experimentally demonstrates the potential for industrial wastewater treatment technology development. Keywords: zeolite; sorption; packed fixed-bed columns; heavy metallic ions; automated sampling design

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