Simultaneous recovery of ammonium and total phosphorus from toilet tail water by modified palygorskite–bentonite clay

Sun, Shengguang; Gui-xia, JI; Lv, Yicheng; Liu, Hongbo; Hu, Tao; Chen, Zhongbing; Xu, Suyun

doi:10.1002/wer.1495

Cited by 8 publications

(3 citation statements)

References 54 publications

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“…For example, the commercial sorbent bifunctional nanocomposite HFO@TPR removed nitrate nitrogen and phosphorus from a binary solution with the capacity of 29 mgN/g and 12 mgP/g [32]. The modified palygorskite-bentonite clay removed phosphates and ammonium from water with the capacity of 1.74 mgP/g and 12.87 mgN/g [52]. The potassium clinoptilolite impregnated hydrated metal oxides had a higher sorption capacity; that is 6.8 mg/g of phosphate and 29.0 mg/g of ammonium [51].…”

Section: Breakthrough Capacitymentioning

confidence: 99%

Adsorption of Ammonium Ions and Phosphates on Natural and Modified Clinoptilolite: Isotherm and Breakthrough Curve Measurements

Stepova,

Fediv,

Mažeikienė

et al. 2023

Water

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The research focuses on ammonia and phosphate removal from wastewater by using a novel metal and microwave-treated clinoptilolite. For increasing adsorption capacity, the samples were calcinated or microwave irradiated in the solutions of Fe(III), Cu (II), or Ca(II) chlorides. BET-specific surface area measurement revealed that the calcination led to a decrease from 18.254 to 11.658 m2/g. The adsorption results were fitted to theoretical models. The PO43− adsorption in all samples as well as NH4+ adsorption in natural and Fe- and Ca-modified samples is best described using the Langmuir–Freundlich model, but in calcinated and Cu-modified clinoptilolite the NH4+ sorption is better characterized by the Freundlich model. The PO43− adsorption in natural and all modified samples is best described using the Langmuir–Freundlich model. Fe-modified and calcinated clinoptilolite showed the highest NH4+ adsorption capacity of 4.375 and 2.879 mg/g. Ca-modified samples demonstrated the lowest adsorption capacity of 0.875 mg NH4+/g. The metal-modified samples exhibit a significantly higher phosphate sorption capacity (from 800.62 for Cu-sample to 813.14 mg/g for the Fe-modified sample) than natural (280.86 mg/g) or calcinated samples (713.568 mg/g). Experimental studies in dynamic conditions revealed high NH4+ and sufficient PO43− ions captured on modified clinoptilolite. This study provides a feasible approach for the synchronous removal of the main eutrophication agents for implementation in additional (tertiary) wastewater treatment facilities.

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Section: Breakthrough Capacitymentioning

confidence: 99%

Adsorption of Ammonium Ions and Phosphates on Natural and Modified Clinoptilolite: Isotherm and Breakthrough Curve Measurements

Stepova,

Fediv,

Mažeikienė

et al. 2023

Water

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“…Physicochemical characteristics of simulated urine were K + 551.2 mg/L, total phosphorus 140.8 mg/L, Na + 1448.7 mg/L, Ca 2+ 32.4 mg/L, respectively. Prior to use, NH 4 + was removed with modi ed composite clay (Sun et al 2020). Chemicals were purchased from Sinopharm Chemical Reagent Co., Ltd. and were all analytically pure.…”

Section: Simulated Urinementioning

confidence: 99%

Electrochemical Crystallization for Recovery of Phosphorus and Potassium from Urine as K-Struvite, with A Sacrificial Magnesium Anode

Shan

Liu

Zhang

et al. 2021

Preprint

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Declining earth resources, rising ore cost and pollution call for better recycling of wastewater in the context of the circular economy. In particular, urine is a potential huge source of phosphorus (P) and potassium (K) agricultural nutrients, yet the efficiency of actual methods for P and K recovery are limited. Here we designed a electrochemical crystallization system using sacrificial magnesium anodes to recover P and K in the form of K-struvite (MgKPO4·6H2O) from simulated urine at low (P/K=0.25) and high (P/K=0.6) phosphate levels, respectively. Results show optimal recoveries of 88.5% for P and 35.4% for K in the form of rod-shaped K-struvite at 3.5 mA/cm2, yet higher current density reduced recovery due to side reactions and pH increase. Adding phosphate to urine increased K recovery to 35.4% versus 15.0% without phosphate. Adding prefabricated struvite crystals at 1.6 g/L into urine enhanced the recovery of K by 14.7% and of P by 23.7% compared to the control group. Overall, our findings show that electrochemical crystallization is promising for the recovery of K-struvite fertilizers.

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Section: Simulated Urinementioning

confidence: 99%

Electrochemical crystallization for recovery of phosphorus and potassium from urine as K-struvite with a sacrificial magnesium anode

Shan

Liu

Long³

et al. 2021

Environ Chem Lett

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Declining earth resources, rising ore cost and pollution call for better recycling of wastewater in the context of the circular economy. In particular, urine is a potential huge source of phosphorus (P) and potassium (K) agricultural nutrients, yet the e ciency of actual methods for P and K recovery are limited.Here we designed a electrochemical crystallization system using sacri cial magnesium anodes to recover P and K in the form of K-struvite (MgKPO 4 •6H 2 O) from simulated urine at low (P/K=0.25) and high (P/K=0.6) phosphate levels, respectively. Results show optimal recoveries of 88.5% for P and 35.4% for K in the form of rod-shaped K-struvite at 3.5 mA/cm 2 , yet higher current density reduced recovery due to side reactions and pH increase. Adding phosphate to urine increased K recovery to 35.4% versus 15.0% without phosphate. Adding prefabricated struvite crystals at 1.6 g/L into urine enhanced the recovery of K by 14.7% and of P by 23.7% compared to the control group. Overall, our ndings show that electrochemical crystallization is promising for the recovery of K-struvite fertilizers.

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Simultaneous recovery of ammonium and total phosphorus from toilet tail water by modified palygorskite–bentonite clay

Abstract: and TP removal of toilet tail water.• The process mechanism of simultaneous nitrogen and phosphorus recovery was clarified with characterization and kinetic model fitting. • The used clay loaded with nutrients could be applied as a slow-release compound fertilizer for soil improvement.

Cited by 8 publications

References 54 publications

Adsorption of Ammonium Ions and Phosphates on Natural and Modified Clinoptilolite: Isotherm and Breakthrough Curve Measurements

Adsorption of Ammonium Ions and Phosphates on Natural and Modified Clinoptilolite: Isotherm and Breakthrough Curve Measurements

Electrochemical Crystallization for Recovery of Phosphorus and Potassium from Urine as K-Struvite, with A Sacrificial Magnesium Anode

Electrochemical crystallization for recovery of phosphorus and potassium from urine as K-struvite with a sacrificial magnesium anode

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