Struvite recovery from municipal-wastewater sludge centrifuge supernatant using seawater NF concentrate as a cheap Mg(II) source

Lahav, Ori; Telzhensky, Marina; Zewuhn, Annette; Gendel, Youri; Gerth, Joachim; Calmano, Wolfgang; Birnhack, Liat

doi:10.1016/j.seppur.2013.02.002

Cited by 165 publications

(50 citation statements)

References 24 publications

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“…The phosphorus is removed in the form of struvite (i.e., ammonium magnesium phosphate hydrate, NH 4 MgPO 4 ·6H 2 O) precipitate [7,26,27], which is a slow-release complex fertilizer. To date, many inexpensive Mg sources have been sought as the key material to improve the economic feasibility of struvite precipitation [28][29][30][31][32]. Here, we identified another good candidate for Mg: the iron ore produced at the Shinyemi mine in Gangwon-do, South Korea.…”

Section: Discussionmentioning

confidence: 99%

Production of High-purity Magnetite Nanoparticles from a Low-grade Iron Ore via Solvent Extraction

Suh¹,

May²,

Kil³

et al. 2015

Korean Chemical Engineering Research

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− We produced magnetite nanoparticles (MNPs) and a Mg-rich solution as a nano-adsorbent and a coagulant for water treatment, respectively, using a low-grade iron ore. The ore was leached with aqueous hydrochloric acid and its impurities were removed by solvent extraction of the leachate using tri-n-butyl phosphate as an extractant. The content of Si and Mg, which inhibit the formation of MNPs, was reduced from 10.3 wt% and 15.5 wt% to 28.1 mg/L and < 1.4 mg/L, respectively. Consequently, the Fe content increased from 68.6 wt% to 99.8 wt%. The high-purity Fe 3+ solution recovered was used to prepare 5-15-nm MNPs by coprecipitation. The wastewater produced contained a large amount of Mg 2+ and can be used to precipitate struvite in sewage treatment. This process helps reduce the cost of both sewage and iron-orewastewater treatments, as well as in the economic production of the nano-adsorbent.

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Section: Discussionmentioning

confidence: 99%

Production of High-purity Magnetite Nanoparticles from a Low-grade Iron Ore via Solvent Extraction

Suh¹,

May²,

Kil³

et al. 2015

Korean Chemical Engineering Research

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“…Previous studies [18,21] showed that operating the NF step at high recovery ratios was beneficial in the sense that it reduced the ratio between the unwanted ions (namely Cl(−I) and Na(I)) and the desired ions (namely Mg(II)) in the brine. The produced NF Mg(II)-rich brine is ultimately used as the Mg(II) ion source at the post-treatment stage in the desalination plant.…”

Section: Description Of a Cheap And Very Simple Process For Enrichingmentioning

confidence: 99%

Establishment of the Underlying Rationale and Description of a Cheap Nanofiltration-Based Method for Supplementing Desalinated Water with Magnesium Ions

Birnhack

Nir

Lahav

2014

Water

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Abstract:The importance of supplying drinking water with a balanced mineral composition, including a minimal concentration of Mg(II) ions, has been recently acknowledged by many publications, as well as in official WHO guidelines. The issue is relevant to naturally occurring soft waters and lately to the rapidly increasing volume of supplied desalinated water. This paper presents an enhancement of a recently developed nanofiltration-based method for the selective separation of soluble Mg(II) species from seawater. The generated rich-Mg(II) brine is demonstrated to be suitable for supplementing soft waters with magnesium ions. The brine, generated using a commercial membrane (DS-5 DL, Osmonics) at various operational conditions is characterized by high Mg(II) concentrations (~8.5 g/L) and low Cl:Mg and Na:Mg molar concentration ratios (1.6 and 0.6, respectively, at 28-bar operation). A food-grade antiscalant is dosed to the feed seawater to prevent scaling; however, since the Mg(II) concentration in the brine is high, for attaining 10 mg Mg/L of desalinated water, the dilution ratio with the desalinated water is ~1:850, resulting in maximal additional concentrations of 0.024 antiscalant, 34.9 Cl(−I), 12.9 Na(I), 0.05 Sr(II) and 0.003 B (all concentrations in mg/L). The overall cost of 1 kg of Mg(II) separated by the presented process amounts to between $0.05 and $0.07, i.e., much cheaper than the estimated costs of alternative processes for Mg(II) addition to desalinated water.

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“…As long as the crystallization conditions are suitable, the struvite crystal would be generated just by adding magnesium (Mg 2+ ) in the raw wastewater which has high concentrations of H n PO 4 n−3 and NH 4 + -N. This technology can remove nitrogen at the same time and its production can be used as fertilizer. So it had been studied in many kinds of wastewater, such as multiple wastewater [13], industrial wastewater [14,15], municipal landfill leachate [16], biogas slurry [17], and effluent of sewage sludge [18], and livestock wastewater is no exception.…”

Section: Introductionmentioning

confidence: 99%

Phosphorus Recovery by Struvite Crystallization from Livestock Wastewater and Reuse as Fertilizer: A Review

Zhang¹,

Jiang²,

Deng³

2017

Physico-Chemical Wastewater Treatment and Resource Recovery

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In China, the intensive livestock farming produces massive livestock wastewater with high concentration of phosphorus. Discharge of these compounds to surface water not only causes water eutrophication but also wastes phosphorus resources for plant growth. Therefore, it's necessary combining the removal of phosphorus from livestock wastewater with its recovery and reuse as fertilizer. As a valuable slow-release mineral fertilizer, struvite crystallization has become a focus in phosphorus recovery. In this chapter, struvite crystallization mechanism, reaction factors, crystallizers, and the applications of struvite as fertilizer are discussed. Two steps of nucleation and crystal growth for struvite crystallization from generation to growth are introduced. The reaction factors, including molar ratio of magnesium and phosphate, solution pH, coexisting substances, and seeding assist, of struvite crystallization are summarized. Several innovate types of crystallizer, which relate to the shape and size of harvest struvite to realize the phosphorus recycling, are demonstrated. Due to the influence of toxic or harmful impurities in struvite on its reuse as fertilizer, the environmental risk evaluation of struvite application is introduced. In conclusion, struvite crystallization is a promising tool for recovering phosphorus from livestock wastewater.

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Struvite recovery from municipal-wastewater sludge centrifuge supernatant using seawater NF concentrate as a cheap Mg(II) source

Cited by 165 publications

References 24 publications

Production of High-purity Magnetite Nanoparticles from a Low-grade Iron Ore via Solvent Extraction

Production of High-purity Magnetite Nanoparticles from a Low-grade Iron Ore via Solvent Extraction

Establishment of the Underlying Rationale and Description of a Cheap Nanofiltration-Based Method for Supplementing Desalinated Water with Magnesium Ions

Phosphorus Recovery by Struvite Crystallization from Livestock Wastewater and Reuse as Fertilizer: A Review

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