Influence of Cu2+ and Zn2+ as additives on crystallization kinetics and morphology of struvite

Muryanto, S.; Bayuseno, A.P.

doi:10.1016/j.powtec.2013.12.027

Cited by 66 publications

(47 citation statements)

References 25 publications

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“…In this case, crystals citric acid were dilute and added into MgCl 2 solution. The precipitation process was monitored by reducing the pH solution [11]. The mass of dried precipitate was weighed using Sartorius weigh-scale.…”

Section: A Preparation Of Crystal-forming Solutionmentioning

confidence: 99%

“…This process is efficient in the sense that they can reduce P concentration in liquid waste to approximately 1 mg / L [5], but causes nutrient accumulation (P, N) in the sludge and contributes to the reaction of magnesium and ammonium ions resulting in struvite deposits as a crystalline crust affecting the efficiency of the treatment process, including dilution of sruvite crystals in waste water [9] , preventive measures with iron salt [10] or addition of chemical inhibitors [4,6]. To reduce the struvite deposits as crystalline crusts generally use inorganic additives [11,12], [13] or organic additives [14], [15].…”

Section: Introductionmentioning

confidence: 99%

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Modeling and Optimization of Struvite Crystal Scaling Using Experimental Design Methodology For Maleic Acid

Perwitasari¹,

Bayuseno²,

Jamari³

et al. 2018

Proceedings of the International Conference on Science and Technology (ICST 2018)

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This paper presents results of an investigation of scaling of magnesium ammonium phosphate hexahydrate (struvite) on a process batch crystallizer. In this study, variables, namely temperature (30-40 o C), stirring speed (200-400 rpm), maleic acid concentration (1-20 ppm) were optimized using RSM (response surface methodology) to provide the optimum yield of the mass scales. The RSM prediction provided that the maleic acid concentration was the most significant factor for scale yield, while the temperature and the stirring speed were insignificant factors determining the optimal condition of the mass scale yields. The optimum mass scale response of 10.43 mg was obtained at a temperature of 30 o C, stirring speed of 300 rpm and maleic acid concentration of 20 ppm, respectively. This gave the best combination of process parameters for struvite crystallization in an aqueous solution.

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Section: A Preparation Of Crystal-forming Solutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling and Optimization of Struvite Crystal Scaling Using Experimental Design Methodology For Maleic Acid

Perwitasari¹,

Bayuseno²,

Jamari³

et al. 2018

Proceedings of the International Conference on Science and Technology (ICST 2018)

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“…Suzuki et al [42] showed that negatively charged SS adsorbed NH 4 + and Mg 2+ easily in the alkaline environment, which retarded the struvite crystalline rate. And Muryanto et al [43] studied on the influence of copper ions (Cu…”

Section: The Wastewater Ph Valuementioning

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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“…Precipitation of struvite is subject to a number of physico-chemical parameters: pH (Nelson et al, 2003;Fang et al, 2016), component-ion molar ratios (Nelson et al, 2003;Wang et al, 2005), intensity of mixing (Fang et al, 2016), and presence of foreign ions (Muryanto & Bayuseno, 2014;Saidou et al, 2015).…”

Section: Influence Of a Number Of Process Parameters On Struvite Precmentioning

confidence: 99%

On precipitation of struvite (MgNH4PO4.6H2O)

Muryanto

2017

JoSSE

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Excessive input of N and P into water bodies causes eutrophication which leads to deterioration of aquatic evironments and has adverse effects naturally and economically. It is therefore urgent to remove N and P from wastewater prior to disposal into inland and coastal waters. Among the various removal methods, controlled struvite precipitation is preferred. Struvite (MgNH4PO4.6H2O) precipitates uncontrollably under the specific conditions producing a scale deposit causing persistent problems in industries and wastewater treatment plants. The scale deposit clogs the piping system and impair plant equipment. On the other hand, thanks to its composition and properties, struvite is a potential fertilizer. In medical field, struvite is a common component of kidney stones. A number of process parameters govern the struvite precipitation. This paper briefly presents these parameters: pH, molar ratios, temperature, mixing, and presence of foreign ions. pH level is considered as the most important variable affecting the precipitation of struvite and the pH level: 9.5 to 10.5 is seen as the optimum. For an effective precipitation the molar ratios of the struvite components, i.e. Mg:N:P should be at least unity. With regard to struvite solubility, the effect of temperature, in the range of 21oC to 49oC, is conflicting, which is probably due to different experimental conditions. Whilst agitation is not regarded as a decisive parameter, the influence of foreign ions, notably divalent metal ions, on struvite morphology and change of crystal phases is significant.

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Influence of Cu2+ and Zn2+ as additives on crystallization kinetics and morphology of struvite

Cited by 66 publications

References 25 publications

Modeling and Optimization of Struvite Crystal Scaling Using Experimental Design Methodology For Maleic Acid

Modeling and Optimization of Struvite Crystal Scaling Using Experimental Design Methodology For Maleic Acid

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

On precipitation of struvite (MgNH4PO4.6H2O)

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