Sorption of Arsenic from Desalination Concentrate onto Drinking Water Treatment Solids: Operating Conditions and Kinetics
Abstract
:1. Introduction
2. Materials and Methods
2.1. RO Concentrate and Analysis
2.2. DWTS and Characterization
2.3. Sorption Experiments
3. Results and Discussion
3.1. Effect of DWTS Dosage
3.2. Kinetics of Arsenic Sorption onto DWTS
3.3. Effect of Initial Arsenic Concentration
3.4. Effect of NOM
3.5. Effect of pH
4. Conclusions
- The percent removal of arsenic increased significantly with an increasing DWTS dosage from ~40% removal at a 1 g/L sorbent dosage to greater than 95% removal at a sorbent dosage of 20 g/L. However, the sorption capacity decreased with an increasing DWTS dosage. For example, for a high arsenic concentration of 20 mg/L, the amount of arsenic sorbed decreased from 6.8 mg/g in RO concentrate and 8.2 mg/g in deionized water at 1 g/L sorbent dosage to 0.92 mg/g at sorbent dosage of 20 g/L for both water matrices. For a lower arsenic concentration of 0.7 mg/L, the amount of arsenic sorbed decreased from 0.32 mg/g in deionized water and 0.24 mg/g in RO concentrate at 1 g/L sorbent dosage to 0.03 mg/g at a sorbent dosage of 20 g/L for both deionized water and RO concentrate.
- At a high DWTS dosage of 20 g/L, no pH-dependent behavior was observed within the pH range of 2–10 because of the abundant sorption sites in DWTS. For a low DWTS dosage of 1–2 g/L, the sorption of arsenic increased substantially as the pH decreased, except at pH 10, in RO concentrate. Precipitation of calcium arsenate at a higher pH (>10) increased arsenic sorption onto DWTS in the presence of a high concentration of calcium in RO concentrate.
- The arsenic sorption kinetics was best described by the pseudo-second-order kinetic model. The intra-particle diffusion kinetics model depicted by plotting qt (mg/g) versus t0.5 (h0.5) showed three distinct sorption steps including boundary diffusion, intra-particle diffusion, and the equilibrium of arsenic to the DWTS.
- Experimental data fitted well to the Freundlich equation, demonstrating a multilayer adsorption process between arsenic in water and DWTS due to surface precipitation of calcium arsenate and the formation of ternary complexes between arsenic and NOM bounded by polyvalent cations (e.g., Fe, Al) in DWTS. The maximum sorption capacities calculated from the Langmuir isotherm in RO concentrate and deionized water were 169 mg/g and 172 mg/g, respectively.
- The presence of NOM in an aqueous phase or a solid phase had significant effects on arsenic sorption onto DWTS. NOM in the aqueous phase hindered the sorption of arsenic to DWTS. The high organic matter content in DWTS enhanced the arsenic sorption from the aqueous phase to the solid phase.
- This study demonstrated that DWTS is effective in removing arsenic from desalination concentrate. The experimental data indicated that the DWTS used in this study has a promising potential for arsenic removal as a low-cost alternative sorbent.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Water Type | DWTS Dosage | Arsenic Conc. | Arsenic Loading | Kad | qe (Experiment) | qe (model) * | R2 |
---|---|---|---|---|---|---|---|
g/L | mg/L | mg/g | (h−1) | (mg/g) | (mg/g) | ||
RO concentrate | 2 | 0.65 | 0.30 | 27.8 | 0.170 | 0.174 | 0.995 |
Deionized water | 2 | 0.60 | 0.32 | 2.17 | 0.260 | 0.281 | 0.996 |
Water Type | DWTS Dosage | Arsenic conc. | Arsenic Loading | Freundlich | Langmuir | Langmuir qmax |
---|---|---|---|---|---|---|
g/L | mg/L | mg/g | R2 | R2 | mg/g | |
RO concentrate | 20 | 1–100 | 0.05–5 | 0.96 | 0.98 | 5.07 |
Deionized water | 20 | 1–100 | 0.05–5 | 0.98 | 0.99 | 4.44 |
RO concentrate | 2 | 0.1–3 | 0.05–1.3 | 0.99 | 0.69 | / |
Deionized water | 2 | 0.075–3 | 0.04–1.5 | 0.95 | 0.60 | / |
Adsorbents | Adsorption Capacity (mg/g) | Water Type | As Conc. (µM) | pH | Temp. (°C) | Langmuir R2 | Ref. |
---|---|---|---|---|---|---|---|
DWTS | 172 | RO concentrate | 17.7~4004 | 7.0 | 23 | 0.99 | This study |
Fe-based DWTS | 42.9 | Groundwater (fresh) | 0.58~ | 8.1 | 22 | 0.98 | [50] |
Al-based DWTS | 47.4 | Synthetic water | 125~6250 | 6.0 | 20 | 0.95 | [47] |
Red mud | 0.51 | Synthetic water (0.1 M NaCl) | 33.3~400 | 3.2 | 25 | 0.99 | [51] |
Goethite | 12.4 | Synthetic water | 133~13,348 | 5.5 | 25 | - | [52] |
Chitosan bead | 39.1 | Synthetic water | 66.7~800 | 7.0 | 25 | 0.91 | [53] |
Mesoporous alumina | 121 | Synthetic water | 100~20,000 | 5.0 | 25 | 0.98 | [44] |
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Xu, X.; Lin, L.; Papelis, C.; Xu, P. Sorption of Arsenic from Desalination Concentrate onto Drinking Water Treatment Solids: Operating Conditions and Kinetics. Water 2018, 10, 96. https://doi.org/10.3390/w10020096
Xu X, Lin L, Papelis C, Xu P. Sorption of Arsenic from Desalination Concentrate onto Drinking Water Treatment Solids: Operating Conditions and Kinetics. Water. 2018; 10(2):96. https://doi.org/10.3390/w10020096
Chicago/Turabian StyleXu, Xuesong, Lu Lin, Charalambos Papelis, and Pei Xu. 2018. "Sorption of Arsenic from Desalination Concentrate onto Drinking Water Treatment Solids: Operating Conditions and Kinetics" Water 10, no. 2: 96. https://doi.org/10.3390/w10020096
APA StyleXu, X., Lin, L., Papelis, C., & Xu, P. (2018). Sorption of Arsenic from Desalination Concentrate onto Drinking Water Treatment Solids: Operating Conditions and Kinetics. Water, 10(2), 96. https://doi.org/10.3390/w10020096