Comparison of adsorption capacity of nWTRs and other adsorbents for Cr(VI) removal. The maximum adsorption capacity (qmax) of nWTRs for chromium is compared with different adsorbents (Table (Table3). 3). It can be seen that the nanostructured WTRs outperformed all the listed adsorbents in Cr(VI) removal from …

For instance, the flotation process is performed with water containing 25–35% wt solid ratio and is consumed 1.9–3 m 3 water per ton of ore processed (Gunson et al., 2012; Li et al., 2019). However, the tailing slurry containing roughly 40–60% solids is discharged as a result of the process (Bleiwas, 2012). The primary environmental ...

The nWTRs efficiency of Cr (VI) removal from wastewater using batch and column techniques were 98.12 and 96.86% respectively. Electrostatic interactions, outer …

The current investigation presents the role of gooseberry (Phyllanthus acidus) seeds as an effective biosorbent for remediating chromium (VI)), a toxic heavy metal pollutant commonly found in effluents from tanneries and relevant industries. Biosorption was affected by pH, temperature and initial metal concentration. Furthermore, there is a need …

The contamination of wastewater with hexavalent chromium (Cr (VI) poses significant health and environmental risks. To alleviate this challenge, our research explores the potential of flow electrodes capacitive deionization (FCDI) technique, an energy-efficient and environmentally friendly approach, for Cr (VI) removal and detoxification.

The residual collector in the flotation tailing may have environmental consequences since it may causes groundwater contamination as a result of improper design of the tailing dam. Furthermore, the process water recycled from the tailing dams may have detrimental effects on the flotation selectivity because of the many dissolved …

complete recovery of metals [12]. Hereafter, froth flotation, as explored in aforemen-tioned studies, can be the more suitable approach to recover Cu from the tailings. One source of the largest quantities of mineral resources is tailing pond of the Erdenet mine, operating for 44 years. The tailing pond covers a total area of 18.6km2 as of

Donnan dialysis is one of the membrane processes. It is based on the cross-exchange of ions having the same electric charge through an ion-exchange membrane. The removal of boron by Donnan ...

Chromium(VI) removal from the synthetic solution was performed by using biochar as an adsorbent. H 3 PO 4 -activated biochar (PBC) performs better than other biochar. The adsorption kinetics, isotherm, and thermodynamic parameters were studied in batch-wise experiments by varying the contact time, initial Cr(VI) concentration, and …

The optimization of adsorption of chromium on activated carbon was carried out to ensure a high adsorption efficiency at low adsorbent dose and high initial concentration of Cr(VI). While the goal of adsorption of chromium optimization was to improve adsorption conditions in batch process, i.e., to minimize the adsorbent dose and …

Optimization of Extracellular Polymeric Substances production using Azotobacter beijreinckii and Bacillus subtilis and its application in chromium (VI) removal ... (VI) removal was recorded for EPS derived from A. beijreinckii and B. subtilis respectively. The presence of functional groups on EPS and their interaction with Cr(VI) was confirmed ...

The uptake of chromium (VI) per weight of adsorbent increased with increasing initial chromium (VI) concentration up to 240-480 mg/L, and decreased sharply with increasing adsorbent concentration ...

Flotation tailings are by-products of coal preparation plants, which do not only occupy cultivated land but also cause pollution. The high ash content and low calorific value of tailings limit their applications. Deashing is the precondition for the reutilization of flotation tailings. However, it is more difficult to remove ash content from flotation …

The mixture of custard apple seeds and Aspergillus niger was used as biosorbents for the removal of chromium(VI) and nickel(II) from the contaminated water. The batch biosorption process was carried out and it was influenced by the different operating parameters such as initial metal ion concentration, pH, temperature, and …

Abstract. Removal of Cr (VI) from aqueous solutions using biochar from sugar beet tailing (SBT) was investigated as a function of pH, contact time, and biochar mass via batch experiments. The surface characteristics of SBT biochar before and after Cr (VI) sorption was investigated with scanning electron microscopy equipped with energy ...

Chromium (Cr) is a typical non-biodegradable heavy metal 1.In nature, chromium mainly exists in the form of Cr(III) and Cr(VI) 2.It is widely used in various industrial processes, such as ...

49.2.1 Preparation of Chromium Solution and Analytical Methods. All the chemicals used are analytical grade. A stock solution of Cr (VI) is prepared by dissolving 2.8287 g of 99.9 % potassium dichromate (K 2 Cr 2 O 7) in 1,000 mL of solution.This solution is diluted as required to obtain the standard solutions containing 20–60 mg/L of Cr (VI).

The effects of microalga‐concentration, pH, and contact time were studied with 250 mg Cr(VI)‐DS L ‐1. The biosorption of Cr(VI)‐DS was higher at acidic pH (94.17 % at pH 4) than at alkaline conditions (68.53 % at pH 10). The interaction of pH and microalga‐concentration exerted significant (p<0.05) influence on the biosorption.

The aim of this paper is the assessment of Donnan dialysis coupled to adsorption process for the removal of chromium from aqueous solutions. This study was conducted in order to benefit...

Optimization of Chromium (Vi) Removal by Donnan Dialysis. American Journal of Analytical Chemistry. Vol.4 No.6 (2013), Article ID:33433,8 pages DOI:10.4236/ajac.2013.46039. Optimization of Chromium (Vi) …

The optimization of adsorption of chromium on activated carbon was carried out to ensure a high adsorption efficiency at low adsorbent dose and high initial concentration of Cr(VI). While the goal of adsorption of chromium optimization was to improve adsorption conditions in batch process, i.e., to minimize the adsorbent dose and …

The open-circuit flotation concentrate has a Sn grade and recovery of 12.01% and 40.59%, respectively, indicating the excellent flotation separation of cassiterite from its associated gangue minerals.

The removal property of different modified hydrochars for Cr(VI) was almost unchanged after adding SO 4 2-and Cl-, attesting that the interfering anions hardly inhibited the capture effect of Cr(VI). Furthermore, the presence of CO 3 2 - and PO 4 3 - increased the pH value, resulting in the pH of the solution being more significant than the ...

In this paper, the vanadium extraction tailings (VT) by sodium roasting—water leaching were used to prepare the active catalyst by activate treatment to explore denitrification. The influence of activating parameters and denitrification conditions on NOX removal of the catalyst were analyzed with selective catalytic reduction (NH3 …

The removal of chromium (VI) from aqueous solutions by Donnan dialysis has been investigated in this paper. In this process, two anion-exchange membranes (AEMs) were …

The second-order regression model was developed to predict the removal efficiency using Design Expert software. The optimal conditions to remove Cr from aqueous solution at constant temperature of 30°C and stirring speed of 250 rpm were found to be contact time 62.5 min, pH 1.96, initial Cr (VI) concentration 145.4 mg/L, and resin dose …

Flotation tailings from copper production are deposits of copper and other valuable metals, such as Mo, V and U. New hydrometallurgical technologies are more economical and open up new possibilities for metal recovery. This work presents results of the study on the extraction of copper by mixed extractant consisting p-toluidine dissolved …

The abatement of SO 2 and the utilization of copper tailings are identified as two attention-attracting environmental issues in the copper smelter. In this study, to improve the flue gas desulfurization performance and the utilization of copper tailings, SO 2 removal from smelting flue gas by using copper tailings combined with MnSO 4 ·H 2 O …

Large-scale application of filled coal mining technology has long been limited by conditions such as the cost of filling. Compared to traditional filling materials, coal flotation tailing filling materials (CFTFM) offers advantages such as low cost and excellent performance. The Box–Behnken response surface method was used to investigate the …

PDF | The removal of chromium (VI) from aqueous solutions by Donnan dialysis has been investigated in this paper. In this process, two anion-exchange... | Find, …

optimization of the Donnan dialysis in the removal of chromium (VI) from a reconstituted solution. The amount of chromium removed was determined as a function of the …

The present study deals with the application and the optimization of the Donnan dialysis in the removal of chromium (VI) from a reconstituted …

the aquatic environmen t in chromium III (T rivalent) and chromium VI (Hexavalent) f orms. e Cr(III) is an important nutrient in humans 5, whereas hexavalent is 100 times mo re toxic than ...

This work aims to compare a biosorption method (BM) and a coagulation–dissolved air flotation method (C/DAFM) as inexpensive and effective means of eliminating hexavalent chromium (Cr[VI]) from industrial wastewater.Synthetic wastewater containing 1000 mg L −1 chromium was used for the experiments. The effect of different parameters (initial …

Phosphorus ore flotation tailings (POFTs) are an industrial solid waste generated in the process of phosphate mining, which contains a large number of Mg, Ca, and P resources. The sources, storage, hazards, and resource environment properties of POFTs were summarized, and the present situation of POFTs treatment and disposal …

1. Introduction. Heavy metal ions pose a grave threat to both living organisms and the environment due to their persistence and toxic properties. These ions, including lead, mercury, chromium, cadmium and arsenic, find their way into ecosystems through various industrial processes, mining activities and improper disposal of waste [1], [2].Once …

Therefore, the objectives of the present research were to: (1) transform the byproducts of drinking water industry (WTRs) to valuable nanostructured WTRs (nWTRs) for enhanced …

A potential industrial waste–waste synchronous treatment scheme of utilizing copper slag flotation tailings to remediate Cr(VI)-containing wastewater. Author ... the reduction of Fe 2 SiO 4 to Fe 0 is the main reason why ACST has strong Cr(VI) remediation ability. 3.3. Optimization of reaction conditions. The effects of four major factors ...

Discover how Donnan dialysis effectively removes chromium (VI) from aqueous solutions. Explore the impact of anion-exchange membranes, counter-ion concentration, and …