Repeated use of MgNH4PO4·6H2O residues for ammonium removal by acid dipping

Zhang, Shujun; Yao, Chonghua; Feng, Xia‐Ting; Yang, Min

doi:10.1016/j.desal.2003.12.009

Cited by 20 publications

(19 citation statements)

References 5 publications

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“…Indeed, despite that the maximum ammonium dissolution occurred at pH 3.5, the corresponding amount of solubilized P limits the n(N):n(P) values. These findings are in agreement with Zhang et al [14], who observed maximum n(N):n(P) molar ratios similar to those detected in this study. The increase of the n(N):n(P) ratio with the process pH from 3.5 to 5.5 is clearly a positive aspect because it allows reduction of the acid amount required during the decomposition phase.…”

Section: Struvite Decompositionsupporting

confidence: 83%

“…Furthermore, this solution could be exploited as a fertilizer source as it is characterized by NH4 + concentrations of up to 18 g(N)/L. In fact, it is mainly composed of ammonium chloride, a compound commonly used as inorganic fertilizer [14]. Obviously, the practical application of residual liquid phase for fertilizers production must be investigated.…”

Section: Struvite Decompositionmentioning

confidence: 99%

“…The temperature of mixture was adjusted by means of a heating plate and then the pH value was set by the addition of acid reactants. The mixture was magnetically mixed at 400 rpm for 2 h. At the end of the treatment, after a settling time of 1 h, the liquid phase was taken to be subjected to the determination of both ammonium and phosphorus content as reported in the literature [14]. Once the optimal decomposition conditions were defined, the settled solids were recovered and used, without purification, for recycling tests.…”

Section: Struvite Decompositionmentioning

confidence: 99%

“…Specifically, for the removal of low biodegradable compounds, advanced oxidation processes represent a suitable option [8][9][10][11][12][13]. However, the development of effective and economic methods for the abatement of the high nitrogen loads of wastewaters still represents a big issue [14,15]. In this regard, the precipitation of ammonium as struvite is a promising approach, due to its high process efficiency and the ease of management [16][17][18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Ammonium Removal from Landfill Leachate by Means of Multiple Recycling of Struvite Residues Obtained through Acid Decomposition

et al. 2016

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Abstract:The treatment of landfill leachate, due to its great polluting load, is a very difficult task. In particular, the abatement of high ammonium concentrations represents one of the main issues. Among the available techniques, struvite precipitation is an effective method for the removal and recovery of NH 4 + load. However, due to the lack of phosphorus and magnesium amounts, the struvite formation results in an expensive process in the leachate treatment. To overcome this issue, in the present work, we developed a simple and suitable method for ammonium removal by the multiple recycling of struvite decomposition residues. In this regard, a procedure for acid dissolution of struvite, produced by using industrial grade reagents, was initially defined. The effect of pH, temperature, and acid type was investigated. The experimental results proved the effectiveness of both hydrochloric and acetic acid, which allow a high and selective release of ammonium at T = 50 • C and pH = 5.5. The multiple reuse of decomposition products, combined with the supplementation of a small quantity of phosphorus and magnesium at molar ratios of n(N):n(Mg):n(P) = 1:0.05:0.05, guarantees stable NH 4 + abatement of about 82%. The proposed process allows a cost saving of around to 74% and can be easily applied in industrial treatment plants.

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Section: Struvite Decompositionsupporting

confidence: 83%

Section: Struvite Decompositionmentioning

confidence: 99%

Section: Struvite Decompositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ammonium Removal from Landfill Leachate by Means of Multiple Recycling of Struvite Residues Obtained through Acid Decomposition

et al. 2016

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“…However, we found that the MAP residues obtained at such a high temperature resulted in a low ammonium removal. Zhang et al (2004) found that MAP powder can release ammonium to form MgHPO 4 at pH 6 5.0 and temperature P40°C, and the resulting decomposition residues could be effectively used for ammonium removal. However, this method allowed about 4% of phosphate and magnesium to be lost each time of MAP decomposition.…”

Section: Determination Of Map Decomposition Conditionsmentioning

confidence: 99%

Repeated use of MAP decomposition residues for the removal of high ammonium concentration from landfill leachate

Yang

Du³

et al. 2007

Chemosphere

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Nitrogen and Phosphorus Removal from Urine by Sequential Struvite Formation and Recycling Process

Latifian

Holst

Liu

2013

CLEAN Soil Air Water

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Recovering nutrients from urine as solid minerals such as struvite can eliminate many hurdles related to the use of liquid urine as fertilizer in the current urine separation systems. The focus of this study has been to increase nitrogen and phosphorus removal efficiencies by developing a struvite formation and recycling process. Struvite crystallization was carried out in urine samples by addition of MgO where 92% of phosphorus as orthophosphate was recovered. In order to optimize the use of calcined struvite in the struvite recycling step, four calcination treatments were tested and calcination at 200°C for 3 h was chosen for further experiments. To remove the remaining ammonia present in urine a struvite recycling step was used subsequently. Through sequential struvite formation and struvite recycling process up to 90% of ammonium nitrogen was successfully removed.

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Repeated use of MgNH4PO4·6H2O residues for ammonium removal by acid dipping

Cited by 20 publications

References 5 publications

Ammonium Removal from Landfill Leachate by Means of Multiple Recycling of Struvite Residues Obtained through Acid Decomposition

Ammonium Removal from Landfill Leachate by Means of Multiple Recycling of Struvite Residues Obtained through Acid Decomposition

Repeated use of MAP decomposition residues for the removal of high ammonium concentration from landfill leachate

Nitrogen and Phosphorus Removal from Urine by Sequential Struvite Formation and Recycling Process

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