Effects of Feed Water Conditions on Performance of Electrodeionization Process for Removal of Ni2+ from Dilute Solution

2012 ◽  
Vol 502 ◽  
pp. 174-178
Author(s):  
Hui Xia Lu ◽  
Shao Feng Bu ◽  
Jian You Wang
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Water Reuse ◽  
Heavy Metal Ions ◽  
Pure Water ◽  
Synthetic Wastewater ◽  
Feed Water ◽  
Separation Performance ◽  
Water Conditions ◽  
And Diffusion

Electrodeionization (EDI) is being applied more and more to treat wastewater containing heavy metal ions, especially for electroplating rinsing wastewater. The effects of feed water conditions including concentration, pH and temperature on the performance of EDI process for removal of Ni2+ from dilute synthetic wastewater were investigated systematically in this paper. It was found that the dilute resistivity of the EDI module descended from 1.5-2.8MΩ•cm to 0.36-0.45MΩ•cm while the influent Ni2+ concentration increased from 45 mg•L-1to 63mg•L-1. Existence of some H+ in feed water would push the stack current up. An increase in temperature of feed water would facilitate the ion exchange and diffusion and thus promote mass transfer. It was indicated that feed water conditions had a significant effect on separation performance of EDI process for treating dilute solutions containing heavy metal ions. Pure water production could be accomplished and water reuse could be realized via EDI technology by appropriately restricting feed water conditions.

Synchronous Concentrating and Purifying Dilute Nickel Wastewater by Electrodeionization Technology

2011 ◽  
Vol 233-235 ◽  
pp. 351-354 ◽  
Author(s):  
Hui Xia Lu ◽  
Jian You Wang ◽  
Shao Feng Bu
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Applied Voltage ◽  
Stream Flow ◽  
Heavy Metal Ions ◽  
Pure Water ◽  
Operating Parameters ◽  
Feed Water ◽  
Water Production ◽  
Flow Rates

Applicable configuration alteration of the electrodeionization （EDI）process commonly for pure water production was carried out to treat dilute nickel wastewater in this paper. The effects of major operating parameters such as applied voltage, dilute and concentrate stream flow rates on the performance of EDI process were investigated systematically. The results showed that, with the feed water containing 50mg·L-1 Ni2+ and pH of 5.7, the dilute resistivity of the EDI could reach higher than 1.0MΩ·cm which gave a Ni2+ rejection more than 99.8% while the Ni2+ was concentrated as high as 1564mg·L-1 in the concentrate stream by optimizing the operating parameters. It was indicated that pure water production and concentrating of heavy metal ions could be simultaneously accomplished via EDI technology just in one process, valuable heavy metal and water resource could be recovered as well.

scholarly journals Effect of LDHs and Other Clays on Polymer Composite in Adsorptive Removal of Contaminants: A Review

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 957 ◽  
Author(s):  
Maleshoane Mohapi ◽  
Jeremia Shale Sefadi ◽  
Mokgaotsa Jonas Mochane ◽  
Sifiso Innocent Magagula ◽  
Kgomotso Lebelo
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Water Purification ◽  
Heavy Metal Ions ◽  
Layered Silicate ◽  
Preparation Methods ◽  
Anionic Clays ◽  
2D Nanomaterials ◽  
Double Hydroxides ◽  
And Diffusion

Recently, the development of a unique class of layered silicate nanomaterials has attracted considerable interest for treatment of wastewater. Clean water is an essential commodity for healthier life, agriculture and a safe environment at large. Layered double hydroxides (LDHs) and other clay hybrids are emerging as potential nanostructured adsorbents for water purification. These LDH hybrids are referred to as hydrotalcite-based materials or anionic clays and promising multifunctional two-dimensional (2D) nanomaterials. They are used in many applications including photocatalysis, energy storage, nanocomposites, adsorption, diffusion and water purification. The adsorption and diffusion capacities of various toxic contaminants heavy metal ions and dyes on different unmodified and modified LDH-samples are discussed comparatively with other types of nanoclays acting as adsorbents. This review focuses on the preparation methods, comparison of adsorption and diffusion capacities of LDH-hybrids and other nanoclay materials for the treatment of various contaminants such as heavy metal ions and dyes.

scholarly journals Indian saffron – Turmeric (Curcuma longa) embedded supermacroporous cryogel discs for heavy metal removal

2019 ◽  
Vol 9 (5) ◽  
pp. 4356-4361 ◽  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Metal Removal ◽  
Curcuma Longa ◽  
Heavy Metal Removal ◽  
Polymeric Materials ◽  
Synthetic Wastewater ◽  
Binding Property ◽  
Hydroxyethyl Methacrylate

Cryogels are used in a variety of environmental and biotechnological processes. Cryogels are polymeric materials with large pores and open flow channels. Turmeric is a very popular spice, especially in India, which has been shown to contain curcumin alkaloids to treat a variety of many diseases. Playing a protective and therapeutic role against the diseases results from being able to bind to various targets. In this study, Indian saffron (Turmeric) embedded poly(2-hydroxyethyl methacrylate) cryogel discs (Tur-PHEMA/CDs) have been prepared to remove heavy metal ions from waste-water, which is a major environmental problem by utilizing the heavy metal binding property of turmeric. Tur-PHEMA/CDs were used to remove Cu(II), Pb(II), Cd(II) ions. Poly(2-hydroxyethyl methacrylate) cryogel discs (PHEMA/CDs) were also used as control polymer. The prepared cryogels are characterized by multiple experimental tests. The Tur-PHEMA/CDs and PHEMA/CDs with respectively swelling ratio of 83.6% and 71.2% were used in heavy metal ions adsorption studies. pH values of the solution were changed in the range of 3.0-6.0 to determine optimum pH. Maximum adsorption capacities of the Tur-PHEMA/CDs from aqueous solution were 18.36 mg/g for Cu(II), 8.99 mg/g for Pb(II) and 5.76 mg/g for Cd(II). The affinity order of heavy metal ions on mass basis was Cu(II) > Pb(II) > Cd(II) from synthetic wastewater. EDTA solution (0.5 M) was used for desorbing of heavy metal ions.

A Technique Method of Recycling Waste Liquid in the Sulfate Copper Plating Technological Experiment in the Laboratory

2013 ◽  
Vol 706-708 ◽  
pp. 500-503
Author(s):  
Shi Lei
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Low Cost ◽  
Pure Water ◽  
Chemical Deposition ◽  
Semipermeable Membrane ◽  
Copper Plating ◽  
Comprehensive Utilization ◽  
Technological Experiment

It introduces a kind of technique method that recycling waste liquid in the sulfate copper plating technological experiment in the laboratory, involving the fields in electroplating and comprehensive utilization of waste liquid. This process includes the following steps: first filter the waste liquid to remove impurities in it, and then using electrolytical method to recycle copper in the waste liquid. Add NaOH, NaHSO3 into the solution, through chemical deposition remove heavy metal ions in the waste liquid, and carry on the harmlessization handle to sediments, finally deal with the waste liquid through a semipermeable membrane to get pure water. This process provides a kind of simple, easy to operate, low cost method for the treatment with waste liquid of electroplating produced in the laboratory, which is toxic and pollute the environment.

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