Potassium recovery from vinasse by integrated electrodialysis – precipitation process: Effect of the electrolyte solutions

Barros, Lívia Vieira de; Brasil, Yara L.; Silva, Ana F.R.; Andrade, Laura Hamdan de; Amaral, Míriam Cristina Santos

doi:10.1016/j.jece.2020.104238

Cited by 13 publications

(12 citation statements)

References 42 publications

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“…They also concluded that when the Mg/P molar ratio was higher than 2, MP was formed at a pH higher than 9.5. In their experimental study, Gao et al [26] reported that as the MP formation at a Mg:K:P molar ratio of 1:1:1 and pH 8-10 significantly inhibited MPP precipitation. Warmadewanthi and Liu [57] experimentally found that bobierrite had mixed with amorphous magnesium phosphate based on XRD results showing bobierrite characteristic peaks at the maximum intensity at pH 10.…”

Section: Operation Phmentioning

confidence: 99%

“…Several works aimed at the recovery of nutrients in the form of struvite were available in the literature, while few papers focused their attention on the precipitation of K-struvite. Despite this, some researchers investigated K-struvite production from cattle manure [55,56], swine wastewater [59], poultry manure [89,90], agro-industrial waste or residual crops [26,31,91], and industrial wastewater [27] (Table S1).…”

Section: Other Sourcesmentioning

confidence: 99%

“…Another work focused on K-struvite recovery from agro-industrial waste by membrane separation technologies. Barros et al [26] studied the influence of different electrolyte solutions (Na 2 SO 4 , MgSO 4 , K 2 SO 4 , and NH 4 NO 3 ) on electrodialysis (ED) performance for the desalination of vinasse and potassium recovery. The study was performed using a mixed configuration composed of one monovalent selective cationic membrane and non-monoselective heterogeneous anionic and cationic membranes.…”

Section: Agro-industrial Wastementioning

confidence: 99%

“…In a similar way to that of MAP, which has a great spectrum of applications from source-separated urine to slaughterhouse wastewaters [6], the tannery industry [25], etc., there are several wastes, including poultry wastes and semiconductor production wastewaters [26][27][28] for which MPP precipitation processes were tested.…”

Section: Introductionmentioning

confidence: 99%

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Is K-Struvite Precipitation a Plausible Nutrient Recovery Method from Potassium-Containing Wastes?—A Review

et al. 2022

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The definition of technologies capable of removing and recovering nutrients from polluting effluents is a key environmental challenge. Through these technologies, it would be possible to protect aquatic systems and prevent the consumption of natural resources for the production of commercial fertilizers. In this regard, the application of the precipitation processes of struvite-type compounds is an attractive approach. Indeed, these processes are potentially able to remove nutrients from many effluents and produce a precipitate reusable as a slow-release fertilizer. The scientific community has largely focused on the precipitation of magnesium ammonium phosphate (MgNH4PO4·6H2O, MAP), while the recovery of the analogous magnesium potassium phosphate (MgKPO4·6H2O, MPP) has received extensive attention in the last decade. Research on this topic is continuously progressing to improve the precipitation process in different aspects (working conditions, reaction units, interference elimination, etc.). Until now, there has been no paper that comprehensively reviewed the applicability of MPP precipitation for the removal and recovery of nutrients from aqueous waste. To fill this gap, the present paper aimed to provide an exhaustive analysis of the literature reports on MPP processes to help researchers understand the theoretical and applicative aspects, the main problems, and the need for further research. In this regard, the applications in the treatment of various aqueous wastes were considered. The theoretical concepts, the main process parameters, and the effects of inhibiting substances and impurities are presented. Moreover, the development of reactor configurations and their working conditions are evaluated. Finally, the potential use of MPP as a fertilizer and some economic evaluations are reported. On the basis of the conducted analysis, it emerged that the recovery of MPP was mainly affected by the pH, dose, and nature of reagents, as well as the presence of competitive ions. The optimal pH values were reported to be between 9 and 11. Reagent overdoses with respect to the theoretical values improved the process and the use of pure reagents guaranteed superior performance. The stirred-tank reactors and fluidized bed reactors were the most used units with high process yields. The applicability of MPP in agronomic practices appears to be a suitable option.

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Section: Operation Phmentioning

confidence: 99%

Section: Other Sourcesmentioning

confidence: 99%

Section: Agro-industrial Wastementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Is K-Struvite Precipitation a Plausible Nutrient Recovery Method from Potassium-Containing Wastes?—A Review

et al. 2022

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“…Common recovery procedures for valuable metals from complex solutions include solvent extraction, chemical precipitation, electrolytic deposition, and ion exchange. 52,135–137…”

Section: Combined Pyro-hydrometallurgical Processmentioning

confidence: 99%