Phosphorus removal by adsorbent based on poly-aluminum chloride sludge

Wu, Huifang; Wang, Junping; Duan, Erhong; Hu, Wenhua; Dong, Yibo; Zhang, Guoqing

doi:10.1016/j.wse.2020.09.006

“…Because in the composition of M-ARM, the calcium content was low, in Figure 10(b), two new peaks appeared, which were the main association of ν (Fe-O-P) and ν (Al-O-P). So, the mechanism of phosphorus adsorption by M-ARM materials was the complexation and deposition of H 2 PO 4 - on sites containing metal oxides such as iron and aluminium [46].…”

Section: Resultsmentioning

confidence: 99%

Application of Mesopore-Activated Red Mud for Phosphorus Adsorption

Trung

¹

,

Ning

²

,

Dan

³

2022

Adsorption Science & Technology

1

0

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In this paper, the mesopore-activated red mud (M-ARM) was prepared by treating red mud (RM) with acid under an ultrasonic batch and through heat treatment at 750 C. The surface area and adsorption average pore width of M-ARM were calculated and obtained values of 13.408 m2 g-1 and 25.160 nm, respectively. Therefore, the maximum adsorption capacity of M-ARM for phosphorus was 200.85 ± 1.66 mg g − 1 at 318 K and pH = 5 . At a low initial concentration (75 mg L-1), the phosphorus removal capacity by M-ARM material was up to 97.09 ± 0.15 % at 313 K. With the temperature scales varying from 298 to 313 K, the values of Gibbs free energy change ( Δ G ° ) were negative and also vary from -37.47 to -36.68. The phosphorus adsorption process in an aqueous solution is spontaneous, and this adsorption process was exothermic with enthalpy change ∆ H o = − 14.36 . From the results of investigations and calculations of thermodynamic values, kinetics, and adsorption capacity of materials, we can confirm that the materials in this study had a low-cost and potential material for applications to treat phosphorus-contaminated water. In addition, the adsorption kinetics of this material for phosphorus were also studied and discussed.

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“…Factors such as adsorbent dose, temperature, and contact time need to be evaluated for a proper design of the setup as an operating system. Many of the literature reports emphasize the relationship between the abovementioned parameters and the removal efficiency [16,[37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][56][57][58][59][60][61].…”

Section: Discussionmentioning

confidence: 99%

Adsorption of Natural Organic Matter and Phosphorus from Surface Water Using Heated Aluminum Oxide (Predeposited) Dynamic Membrane Adsorber

Malczewska

¹

2021

Applied Sciences

3

0

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The paper reports the removal of phosphorus and natural organic matter (NOM) from surface water by dynamic membrane (DM) adsorber. DM filter builds up as a layer of particles deposited via permeation through the membrane’s surface. This study reports the application of Heated Aluminium Oxide Particles (HAOPs) as a dynamic membrane adsorber. Filtration experiments were conducted with surface water and batch tests were carried out with synthetic water. The efficiency of phosphorus removal along with the efficiency of organics (represented as UV-254) removal was evaluated. Additionally, the impact of HAOPs surface loading on the changes of transmembrane pressure (TMP), the kinetics, isotherm modeling of the adsorption and the effect of the pH, the effect of ionic strength, the effect of coexisting organic matter on phosphorus removal efficiency were studied. In the case of phosphorus removal in batch adsorption experiments, its sorption kinetic and isotherm data were analyzed using pseudo-first- and pseudo-second-order models and Langmuir and Freundlich models, respectively. The results indicated that Langmuir adsorption isotherm fits the experimental data best (0.9894). The kinetics of phosphorus adsorption on HAOPs was best described by the pseudo-second-order model and the best removal was achieved at the pH 6–7 (96.65% on average). An increase in ionic strength did not impact the efficiency of phosphorus removal significantly. The outcome of this study highlights HAOPs efficiency in NOM removal up to 92% in filtration experiments. In the case of phosphorous, removal efficiency varied. For the highest HAOPs dose, the degree of phosphorus removal ranged up to 93 ± 5%. The same removal efficiency was observed for the lowest dose while for 17 g/m2 of HAOPs the fluctuations were larger and varied from 64.7% to 92%. The results demonstrate that HAOPs could potentially be applied in the removal of phosphorus from surface water, especially when there is a high concentration of phosphorus in the water. However, this process requires further research and optimization of its parameters.

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“…At present, there are several methods for removing phosphate, such as chemical precipitation, biological treatment, adsorption, and membrane separation [ 15 , 16 , 17 , 18 ]. Among them, adsorption has attracted extensive attention due to its simple operation, less residue generation, strong adaptability, and the ability to remove phosphate at low concentrations [ 19 , 20 , 21 ]. Zhang et al [ 22 ] prepared a novel type of Fe–Mg–Zr layered bimetallic hydroxide (LDH) via a simple in situ crosslinking method and applied it to wastewater containing phosphate.…”

Section: Introductionmentioning

confidence: 99%

Using Iron Tailings for Phosphate Removal in Cemented Phosphogypsum (PG) Backfill

Shi

¹

,

Xiao-lin

²

,

Qing

³

et al. 2022

Materials

3

0

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Compared with the post-treatment of pollutants, such as the removal of phosphate from wastewater, it is more important to develop effective emission control strategies to reduce phosphate pollution. Phosphogypsum (PG) is a typical solid waste byproduct of phosphate production and contains high amounts of residual phosphate. In order to control the phosphate emissions during the recycling of PG aggregates for cemented backfill, another solid waste product—iron tailings (ITs)—was added during the preparation of backfill slurry. The results showed that the ITs effectively accelerated the phosphate removal in cemented PG backfill, enabling the quick reduction in the phosphate concentration to the discharge standard (<0.5 mg/L) within 15 min. This means that the emissions of phosphate to bleeding water were effectively controlled. The adsorption experiment showed that phosphate was adsorbed by the ITs, and the adsorption data fitted well with the Langmuir adsorption model (R2 = 0.98) and pseudo-second-order kinetic model (R2 = 0.99), indicating that the phosphate adsorption of ITs was a monolayer chemical adsorption. Furthermore, an unconfined compressive strength (UCS) test was performed on the backfill with the addition of ITs. Compared to the control group (without ITs), the UCS of backfill with 20% ITs increased from 1.08 MPa to 1.33 MPa, indicating that the addition of solid waste could be beneficial to the strength development of the backfill by mitigating the interference of phosphate with the hydration process. The backfill cured for 28 d was selected for the toxic leaching test, and the phosphate concentration in the leachates was always below 0.02 mg/L, indicating that ITs can effectively immobilize phosphate in backfill for a long time.

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Phosphorus removal by adsorbent based on poly-aluminum chloride sludge

Cited by 11 publications

References 18 publications

Application of Mesopore-Activated Red Mud for Phosphorus Adsorption

Application of Mesopore-Activated Red Mud for Phosphorus Adsorption

Adsorption of Natural Organic Matter and Phosphorus from Surface Water Using Heated Aluminum Oxide (Predeposited) Dynamic Membrane Adsorber

Using Iron Tailings for Phosphate Removal in Cemented Phosphogypsum (PG) Backfill

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