Phosphate adsorption on metal oxides and metal hydroxides: A comparative review

2016 ◽  
Vol 24 (3) ◽  
pp. 319-332 ◽  
Author(s):  
Mengxue Li ◽  
Jianyong Liu ◽  
Yunfeng Xu ◽  
Guangren Qian
Keyword(s):  
Metal Oxides ◽  
Phosphorus Removal ◽  
Low Cost ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
Alkaline Solutions ◽  
Synthesis Methods ◽  
Mechanism Study ◽  
Metal Hydroxides ◽  
Comparative Review

Phosphorus removal from wastewater is important for eutrophication control of water bodies. Metal oxides and metal hydroxides have always been developed and investigated for phosphorus removal, because of their abundance, low cost, environmental friendliness, and chemically stability. This paper presents a comparative review of the literature on the preparation methods, adsorption behaviors, adsorption mechanisms, and the regeneration of metal (hydr)oxides (e.g., Fe, Zn, Al, etc.) with regard to phosphate removal. The contrasting results showed that metal hydroxides could offer an effective and economic alternative to metal oxides, because of their cost–benefit synthesis methods, higher adsorption capacities, and shorter adsorption equilibrium times. However, the specific surface area of metal oxides is larger than that of metal hydroxides because of the calcination process. Metal oxides with a higher pH at the zero point of charge have wider optimal adsorption pH ranges than metal hydroxides because of their surface precipitation in alkaline solutions. The regeneration of metal oxides using acids, bases, and salts and that of metal hydroxides using acids and bases has been critically examined. Further research on uniform metal (hydr)oxides with small particle size, high stabilities, low cost, and that are easily regenerated with promising desorbents are proposed. In addition, quantitative mechanism study and application in continuous-mode column trials are also suggested.

scholarly journals Adsorptive Removal of Phosphate from Aqueous Solutions Using Low-Cost Volcanic Rocks: Kinetics and Equilibrium Approaches

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1312
Author(s):  
Dereje Tadesse Mekonnen ◽  
Esayas Alemayehu ◽  
Bernd Lennartz
Keyword(s):  
Aqueous Solutions ◽  
Low Income ◽  
Low Cost ◽  
Volcanic Rocks ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
Adsorptive Capacity ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Adsorptive Removal

The contamination of surface and groundwater with phosphate originating from industrial and household wastewater remains a serious environmental issue in low-income countries. Herein, phosphate removal from aqueous solutions was studied using low-cost volcanic rocks such as pumice (VPum) and scoria (VSco), obtained from the Ethiopian Great Rift Valley. Batch adsorption experiments were conducted using phosphate solutions with concentrations of 0.5 to 25 mg·L−1 to examine the adsorption kinetic as well as equilibrium conditions. The experimental adsorption data were tested by employing various equilibrium adsorption models, and the Freundlich and Dubinin-Radushkevich (D-R) isotherms best depicted the observations. The maximum phosphate adsorption capacities of VPum and VSco were calculated and found to be 294 mg·kg−1 and 169 mg·kg−1, respectively. A pseudo-second-order kinetic model best described the experimental data with a coefficient of correlation of R2 > 0.99 for both VPum and VSco; however, VPum showed a slightly better selectivity for phosphate removal than VSco. The presence of competitive anions markedly reduced the removal efficiency of phosphate from the aqueous solution. The adsorptive removal of phosphate was affected by competitive anions in the order: HCO3− >F− > SO4−2 > NO3− > Cl− for VPum and HCO3− > F− > Cl− > SO4−2 > NO3− for VSco. The results indicate that the readily available volcanic rocks have a good adsorptive capacity for phosphate and shall be considered in future studies as test materials for phosphate removal from water in technical-scale experiments.

Preparation and Application of Polymer-Metal Oxide Nanocomposites in Wastewater Treatment

2020 ◽  
pp. 83-102
Author(s):  
Victor Odhiambo Shikuku ◽  
Wilfrida N. Nyairo
Keyword(s):  
Wastewater Treatment ◽  
Water Treatment ◽  
Metal Oxides ◽  
Low Cost ◽  
Drinking Water Treatment ◽  
Synthesis Methods ◽  
Operational Conditions ◽  
Polymer Metal ◽  
Treatment Technologies ◽  
Sustainable Wastewater Treatment

The search for efficient and sustainable wastewater treatment technologies is a subject of continuing research. This is due to the emergence of new classes of water contaminants that are recalcitrant to the conventional wastewater treatment technologies and the stringent allowable limits for contaminant levels set by environmental management authorities. The chapter discusses the developments in synthesis methods and application of polymer-metal oxides as emerging facile materials for wastewater treatment. The varying uses of polymer-metal oxides for different processes in water treatment under varying operational conditions and their performance for different pollutants are critically analyzed. Their strengths and inherent limitations are also highlighted. The chapter demonstrates that polymer-metal oxides are facile low-cost and efficient materials and can be integrated in wastewater and drinking water treatment systems.

scholarly journals Adsorptive Removal of Phosphate From Wastewater Using Ethiopian Rift Pumice: Batch Experiment

2020 ◽  
Vol 13 ◽  
pp. 117862212096965
Author(s):  
Yohannis Fetene ◽  
Taffere Addis
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Low Cost ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
Phosphate Solution ◽  
Order Kinetic ◽  
Tertiary Treatment ◽  
Treatment Unit ◽  
Column Adsorption

Phosphorous from municipal and industrial wastewater is the main cause of eutrophication of rivers and lakes, because effluent quality from conventional secondary wastewater treatment plants does not meet the discharge standard that demands further treatment. Therefore, we investigated pumice as a potential low-cost adsorbent for the tertiary treatment of phosphate from municipal wastewater. The phosphate adsorption process reached equilibrium after 60 minutes contact time and achieved a removal efficiency of 94.4% ± 0.7% for an adsorbent dose of 10 g/L in 3 mg/L phosphate solution. The highest phosphate removal was recorded at pH 7. The experimental data best fitted with the Redlich-Peterson isotherm and the pseudo-second-order kinetic models. The coexisting anions decreased phosphate adsorption in the order of mixture >SO42– > HCO3− > NO3− > Cl− > CO3−. Pumice removed 95% ± 0.2% of phosphate from effluents of the secondary treatment unit of a municipal wastewater treatment plant. Furthermore, effective regeneration of saturated pumice was possible with a 0.2 M NaOH solution. Therefore, pumice could be a technically workable low-cost reusable adsorbent for phosphate removal from wastewater as a tertiary treatment to curb eutrophication of surface waters. However, further column adsorption study is recommended for a continuous flow system to optimize process design variables and scale up for field applications.

Kinetic studies of phosphate adsorption onto construction solid waste (CSW)

2014 ◽  
Vol 49 (4) ◽  
pp. 307-318 ◽  
Author(s):  
C. Liu ◽  
Y. Yang ◽  
N. Wan
Keyword(s):  
Solid Waste ◽  
Low Cost ◽  
Kinetic Studies ◽  
Second Order ◽  
Phosphate Removal ◽  
Alkaline Condition ◽  
Phosphate Adsorption ◽  
Particle Diffusion ◽  
Order Kinetic ◽  
Intra Particle Diffusion

Adsorption of phosphate onto construction solid waste (CSW) was investigated in a batch system. CSW as an inescapable by-product of the construction and demolition process, was used as a composite adsorbent for the removal of phosphate in this study. The adsorption kinetics was investigated under various parameters such as contact time, pH, CSW dosage, initial phosphate concentration and particle size. Greater percentage of phosphate was removed with decrease in the initial concentration and increase in the amount of CSW used. Adsorption of phosphate was pH dependent, and maximum phosphate immobilisation capacity was obtained in alkaline condition. Lagergren first-order, second-order, intra-particle diffusion and external diffusion model were used to test the experimental data. Kinetic analysis showed that the adsorption was best fitted with the pseudo-second-order kinetic model. Adsorption mechanism studies revealed that both external mass transfer and intra-particle diffusion had rate limiting effects on the removal process. These results demonstrated that the CSW could be used as a low-cost adsorbent media for phosphate removal, and the data were relevant for optimal design of wastewater treatment plants.

Adsorptive removal of phosphate from aqueous solutions using lead–zinc tailings

2013 ◽  
Vol 67 (5) ◽  
pp. 983-988 ◽  
Author(s):  
Shuncai Wang ◽  
Rongzhuo Yuan ◽  
Xueyong Yu ◽  
Chaojie Mao
Keyword(s):  
Laboratory Experiments ◽  
Low Cost ◽  
Ph Effect ◽  
Cost Effective ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
Isotherm Models ◽  
Effective Removal ◽  
Elovich Equation ◽  
Lead Zinc

This study explored the feasibility of utilizing lead–zinc tailings for phosphate removal in laboratory experiments. The adsorption isotherm, kinetics and pH effect were examined in batch experiments. The Freundlich and Langmuir isotherm models were used for data fitting. The adsorption kinetics can be best described by the simple Elovich equation. The phosphate adsorption tends to decrease with the increase of pH, from 0.37 mg P/g at pH 2.05 to 0.12 mg P/g at pH 7.01, and tends to increase from 0.12 mg P/g at pH 7.01 to 0.64 mg P/g at pH 12.52. The actual phosphate removal on the tailings could be a consequence of adsorption and precipitation reactions with Fe, Al and Ca. Due to their low cost, this type of tailings has the potential to be utilized for cost-effective removal of phosphate from wastewater.

Effects of Aeration on Nitrogen and Phosphate Removal with A2O Process

2012 ◽  
Vol 622-623 ◽  
pp. 1738-1741 ◽  
Author(s):  
Yong Feng Li ◽  
Jian Yu Yang ◽  
Guo Cai Zhang
Keyword(s):  
Phosphorus Removal ◽  
High Efficiency ◽  
Low Cost ◽  
Significant Decline ◽  
Phosphate Removal ◽  
Synthetic Wastewater ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
System A ◽  
Nitrogen And Phosphate Removal

A2O process is shortened form Anaerobic-Anoxic-Aerobic process, which can achieve carbon, nitrogen and phosphate removal, is widely used for its low cost and high efficiency. The Experiment using a 52.15 L anaerobic-anoxic- aerobic (A2O) reactor with simulate synthetic wastewater, by adjusting the aeration of Aerobic units, observing the performance of nitrogen and phosphorus removal under different dissolved oxygen(DO). The result of the whole operation show that the system can not keep a high TN removal efficiency under high aeration, and the low aeration made the system a significant decline in nitrogen and phosphorus removal.

Removal of phosphate by seafood processing wasted sludge

2002 ◽  
Vol 46 (9) ◽  
pp. 297-302 ◽  
Author(s):  
S.M. Lee ◽  
B.J. Choi ◽  
K.H. Kim
Keyword(s):  
Low Cost ◽  
Relative Concentration ◽  
Correlation Coefficients ◽  
Experimental System ◽  
Good Alternative ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
Operational Variables ◽  
Seafood Processing ◽  
Adsorbent Dose

There is a need for developing low cost, easily and abundantly available, yet efficient, adsorbents for the removal of phosphates during the tertiary treatment of wastewater. The wasted sludge from a cuttlefish processing factory prepared on a laboratory scale has been used to evaluate its performance for phosphate adsorption. The material has been shown to be a good alternative adsorbent. As much as 90% phosphate removal by the prepared sludge is possible in about 20 h under the test conditions. Phosphate removal is seen to increase with decreasing adsorbent particle size, increasing the relative concentration of phosphate to sludge and increasing adsorbent dose. Models for predicting phosphate removal incorporate operational variables such as the ratio of phosphate to wasted material and adsorbent dose. These models also manifest high values of the correlation coefficients. Calcium phosphate precipitation in the present experimental system is not a significant phosphate removal mechanism.

Phosphate adsorption on novel hydrogel beads with interpenetrating network (IPN) structure in aqueous solutions: kinetics, isotherms and regeneration

RSC Advances ◽  
2016 ◽  
Vol 6 (28) ◽  
pp. 23233-23241 ◽  
Author(s):  
Jun Wan ◽  
Tao Tao ◽  
Yong Zhang ◽  
Xiangmin Liang ◽  
Aijiao Zhou ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Phosphorus Removal ◽  
Low Cost ◽  
Phosphate Adsorption ◽  
Interpenetrating Network ◽  
P Adsorption ◽  
Hydrogel Beads

Adsorption has attracted much attention for its effectiveness, low cost and the possibility of regeneration among many phosphorus removal methods.

Preparation and Application of Polymer-Metal Oxide Nanocomposites in Wastewater Treatment

2021 ◽  
pp. 393-407
Author(s):  
Victor Odhiambo Shikuku ◽  
Wilfrida N. Nyairo
Keyword(s):  
Wastewater Treatment ◽  
Water Treatment ◽  
Metal Oxides ◽  
Low Cost ◽  
Drinking Water Treatment ◽  
Synthesis Methods ◽  
Operational Conditions ◽  
Polymer Metal ◽  
Treatment Technologies ◽  
Sustainable Wastewater Treatment

The search for efficient and sustainable wastewater treatment technologies is a subject of continuing research. This is due to the emergence of new classes of water contaminants that are recalcitrant to the conventional wastewater treatment technologies and the stringent allowable limits for contaminant levels set by environmental management authorities. The chapter discusses the developments in synthesis methods and application of polymer-metal oxides as emerging facile materials for wastewater treatment. The varying uses of polymer-metal oxides for different processes in water treatment under varying operational conditions and their performance for different pollutants are critically analyzed. Their strengths and inherent limitations are also highlighted. The chapter demonstrates that polymer-metal oxides are facile low-cost and efficient materials and can be integrated in wastewater and drinking water treatment systems.

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