Efficient removal of nitrogen and phosphorus in aqueous solutions using modified water treatment residuals–sodium alginate beads

Fu, Guiping; Zhao, Yuanyuan; Zhou, Shuang; Chen, Chongyu; Zhong, Yu; Xu, Yanbin

doi:10.1007/s11356-021-12586-6

Cited by 22 publications

(19 citation statements)

References 48 publications

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“…It is obvious that higher dosage leads to lower adsorption capacity; hence, in consideration of the removal rate and adsorption capacity, the dosage of 1 g/L is chosen in following experiments. [35]. At initial concentration of 20, 50, and 100 mg/L, the equilibrium MO concentration decreased to 11.0, 23.0, and 41.5 mg/L.…”

Section: Resultsmentioning

confidence: 89%

“…Time-dependent adsorption experiments were carried out with different initial dye concentrations (20, 50, and 100 mg/L). As shown in Figures 4(a) and 4(d), the remaining concentrations of MO and CR are recorded at different time intervals in 36 h. Obviously, the adsorption reactions show rapid adsorption rates at initial stage and stabilized afterwards [35]. At initial concentration of 20, 50, and 100 mg/L, the equilibrium MO concentration decreased to 11.0, 23.0, and 41.5 mg/L.…”

Section: Resultsmentioning

confidence: 99%

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Anionic Dye Removal by Polypyrrole-Modified Red Mud and Its Application to a Lab-Scale Column: Adsorption Performance and Phytotoxicity Assessment

Zhang

Yin

Qiao

et al. 2021

Adsorption Science & Technology

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In this study, polypyrrole-modified red mud (PRM) was prepared for the efficient removal of anionic dyes (methyl orange and Congo red) from aqueous solutions. The phytotoxicity (bean sprouts) of the dye solution before and after dye removal was investigated. Adsorption kinetics confirmed that the adsorption of methyl orange (MO) and Congo red (CR) on PRM was controlled by chemical reactions between the functional groups of polypyrrole and dyes. From Langmuir isotherm fitting, we found the theoretical adsorption capacities of MO and CR on PRM were 194.1 and 314.9 mg/g, respectively. The adsorption progress of MO and CR on PRM was found to be spontaneous and endothermic. The column studies demonstrated that, under dynamic flow, the PRM can efficiently remove MO and CR from aqueous solution, with adsorption capacities of 31.08 and 55.04 mg/g, respectively. In the toxicity test, the phytotoxicity of the column effluents (after dye removal) was significantly lowered compared to the initial dye influents. After the removal of MO and CR, the average root length of bean sprouts was increased from 3.30 cm to 5.18 cm and from 3.01 cm to 7.00 cm, respectively. These findings highlighted the efficient removal of dyes by PRM from aqueous solution, demonstrating the possible application of PRM for the removal of dye from dye-contaminated wastewaters.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Anionic Dye Removal by Polypyrrole-Modified Red Mud and Its Application to a Lab-Scale Column: Adsorption Performance and Phytotoxicity Assessment

Zhang

Yin

Qiao

et al. 2021

Adsorption Science & Technology

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show abstract

“…These modifications result in favorable characteristics such as enhanced specific surface area and easy regeneration capacity. These modified WTRs have been used for the removal of a variety of pollutants such as fluoride [ 34 ], nitrogen and phosphorus [ 35 ], turbidity [ 19 ], molybdenum (VI) [ 20 ], chromium [ 36 ] and dyes [ 26 , 31 , 37 ], among others.…”

Section: Introductionmentioning

confidence: 99%

Application of modified water treatment residuals in water and wastewater treatment: A review

Sharma

Ahammed

2023

Heliyon

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“…For example, the chemical precipitation method can easily cause secondary pollution [19], while the biological treatment technique requires a long reaction period with stringent conditions [20]. In comparison, adsorption is a relatively convenient and reliable technique, but it normally has a long treatment cycle and low efficiency, and if one wants to use an efficient adsorbent for the adsorption, the cost is usually high [21].…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Removal of Nitrate and Phosphate to Control Eutrophication by the Dielectrophoresis-Assisted Adsorption Method

Jin

Liang

et al. 2022

IJERPH

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The removal of excessive amounts of nitrate and phosphate from water sources, especially agricultural wastewater, has been of high significance to control eutrophication in aquatic systems. Here, a new method is reported for the removal of nitrate and phosphate simultaneously from wastewater based on the combination of the solution-phased adsorption (ADS) and dielectrophoresis (DEP) techniques. The plant ash was first selected as the adsorbent by screening tests, followed by a systematic investigation of using the adsorbent to remove nitrate and phosphate from wastewater under various experimental conditions, including the testing of adsorbent dosage, pretreatment time, water flow rate, and electrode voltage. The analysis of the adsorbent particles was also performed by scanning electron microscope (SEM) analysis, the energy dispersive X-ray spectroscopy (EDX) test, and the measurement of Zeta potentials. Compared with the ADS method alone, the introduction of DEP into the purification process has greatly increased the removal rate by 66.06% for nitrate and 43.04% for phosphate, respectively. In the meantime, it is observed that the processing time has been greatly reduced by 92% with the assistance of DEP.

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Efficient removal of nitrogen and phosphorus in aqueous solutions using modified water treatment residuals–sodium alginate beads

Cited by 22 publications

References 48 publications

Anionic Dye Removal by Polypyrrole-Modified Red Mud and Its Application to a Lab-Scale Column: Adsorption Performance and Phytotoxicity Assessment

Anionic Dye Removal by Polypyrrole-Modified Red Mud and Its Application to a Lab-Scale Column: Adsorption Performance and Phytotoxicity Assessment

Application of modified water treatment residuals in water and wastewater treatment: A review

Highly Efficient Removal of Nitrate and Phosphate to Control Eutrophication by the Dielectrophoresis-Assisted Adsorption Method

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