Ammonia-nitrogen and phosphates sorption from simulated reclaimed waters by modified clinoptilolite

Huo, Hanxin; Lin, Hai; Dong, Yingbo; Cheng, Huang; Wang, Han; Cao, Lixia

doi:10.1016/j.jhazmat.2012.06.001

Cited by 134 publications

(59 citation statements)

References 14 publications

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“…MgO-D exhibited an excellent performance on nutrients removal in a wide pH range of (T 25°C, pH 7, adsorbent dosage 0.3 g L -1 ) Z-Al (hydrated aluminum oxide modified zeolite ) 7.0 30 [1] Modified Clinoptilolite (NaCl, FeCl3, thermal) 0.87 3.33 [46] Ferrihydrite-modified diatomite 37.3 [21] MKC (Mg-Al hydrotalcite loaded) 11.85 - [47] Ca-bentonite -46.90 [48] Integrated modified zeolite -17.24 [49] MgO-D 160.94 77.05 Present study…”

Section: Discussionmentioning

confidence: 99%

Struvite crystallization combined adsorption of phosphate and ammonium from aqueous solutions by mesoporous MgO⿿loaded diatomite

Xia

Wang

Song

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

119

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Section: Discussionmentioning

confidence: 99%

Struvite crystallization combined adsorption of phosphate and ammonium from aqueous solutions by mesoporous MgO⿿loaded diatomite

Xia

Wang

Song

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

119

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“…Borgnino et al (2009) showed that the P adsorption capacity was increased by modifying the clay with Fe(III). Also, Huo et al (2012) indicated that the zeolite modified by NaCl and FeCl 3 had high P removal efficiency. Two different models, Langmuir and Freundlich, were used to predict sorption of P onto modified adsorbents, but the Langmuir model was not well described sorption P onto modified adsorbents (data not shown).…”

Section: Sorption and Desorption Isothermsmentioning

confidence: 97%

“…Ma and Zhu (2006) studied sorption of P on bentonite and showed that sorption of P increased slightly with an increase of temperature. Huo et al (2012) and Yan and Xu (2010) used modified materials for P adsorption. They indicated that P sorption by modified clinoptilolite and pillared bentonites was spontaneous and endothermic.…”

Section: Effect Of Ph and Ionic Strengthmentioning

confidence: 99%

Use of modified clays for removal of phosphorus from aqueous solutions

Moharami

Jalali

2015

Environ Monit Assess

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Phosphorus (P) removal from aqueous solutions was investigated using modified bentonite, calcite, kaolinite, and zeolite with FeCl3, CaCl2, and NaCl. The maximum sorption capacity of P was obtained by modified adsorbents with Fe(3+) ions (Fe-adsorbents). The results showed that P sorption capacity by Fe-adsorbents (bentonite (1.31 mg g(-1)), calcite (1.97 mg g(-1)), kaolinite (1.31 mg g(-1)), and zeolite (1.58 mg g(-1))) was improved by ∼467, 107, 409, and 427 %, respectively, compared to unmodified adsorbents (bentonite (0.28 mg g(-1)), calcite (1.82 mg g(-1)), kaolinite (0.32 mg g(-1)), and zeolite (0.37 mg g(-1))). Sorption isotherms were well described by the Freundlich model. Desorption experiments showed that the desorption capacity was in order of unmodified adsorbents > modified adsorbents with Na(+) ions (Na-adsorbents) > modified adsorbents with Ca(2+) ions (Ca adsorbents) > Fe-adsorbents. Effect of pH and ion strength was also investigated. At different pH, changes in the ionic strength had little effect on the adsorption. Results showed that double-layer model (DLM) could model P adsorption onto modified adsorbents over a wide range of pH and varying ionic strength. According to the scanning electron microscopy (SEM) images and saturation indices (SIs), high P removal by adsorbents was partly due to the P precipitation.

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“…3 shows that the characteristics of ammonianitrogen adsorption of this zeolite was fast adsorption and slow balance, as time passed [24]. In the first stage of adsorption reaction, the ammonia adsorption rate increased.…”

Section: Ammonia Sorption By Zeolitementioning

confidence: 89%

Nitrogen and Phosphate Recovery from Source-Separated Urine by Dosing with Magnesite and Zeolite

Xu¹,

Luo²,

He³

et al. 2015

Pol. J. Environ. Stud.

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There is increasing interest in source separation and treatment of urine so as to recover nitrogen and phosphate more efficiently than treating combined wastewater. Although previous studies primarily focused on struvite precipitation for the recovery of phosphorus, the composition of urine changes during storage. The present study compared the precipitation conditions for fresh urine and hydrolyzed urine. The optimal conditions for struvite crystallization were obtained from orthogonal experiment and single-factor optimization. The pH of fresh urine should be adjusted to around 9.5-10.0 to make the reaction thorough, while this was unnecessary for hydrolyzed urine. To reduce cost, magnesite was selected as an alternative for pure MgO, which presented similar efficiency for phosphate recovery. About 92.4% of phosphorus and 87.2% of ammonia-nitrogen were recovered from urine when adding 2.5 g/L of magnesite and 375 g/L of zeolite to get struvite crystals and nitrogen-rich zeolite as a slow-release fertilizer. Graphical Abstract

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Ammonia-nitrogen and phosphates sorption from simulated reclaimed waters by modified clinoptilolite

Cited by 134 publications

References 14 publications

Struvite crystallization combined adsorption of phosphate and ammonium from aqueous solutions by mesoporous MgO⿿loaded diatomite

Struvite crystallization combined adsorption of phosphate and ammonium from aqueous solutions by mesoporous MgO⿿loaded diatomite

Use of modified clays for removal of phosphorus from aqueous solutions

Nitrogen and Phosphate Recovery from Source-Separated Urine by Dosing with Magnesite and Zeolite

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