Recovery of phosphorus as struvite from sewage sludge ash

Xu, Huacheng; He, Pinjing; Gu, Wei-Mei; Wang, Guangzhao; Shao, Liming

doi:10.1016/s1001-0742(11)60969-8

Cited by 160 publications

(98 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…F value is used to represent the impact of corresponding factor and a higher value shows a statistically significant effect. Herein, pH was the most significant factor affecting the phosphate recovery rate, which corresponded to the previous studies [15,16]. While the influence of n Mg :n P was less than reac- tion time, it is different from the previous study, which presented that phosphate recovery was highly associated with n Mg :n P rather than reaction time [17].…”

Section: Orthogonal Experimentssupporting

confidence: 72%

“…In the present tests, the highest phosphate recovery of 96.7% was achieved under conditions of pH, n Mg :n P and reaction times were 9, 1.4, and 30 min, respectively. In addition, to get the most significant factor in the struvite precipitate tests, an analysis of variance was applied, as shown in Table 3 [15,16]. F value is used to represent the impact of corresponding factor and a higher value shows a statistically significant effect.…”

Section: Orthogonal Experimentsmentioning

confidence: 99%

See 1 more Smart Citation

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

Xu¹,

Luo²,

He³

et al. 2015

Pol. J. Environ. Stud.

View full text Add to dashboard Cite

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

show abstract

Section: Orthogonal Experimentssupporting

confidence: 72%

Section: Orthogonal Experimentsmentioning

confidence: 99%

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

Xu¹,

Luo²,

He³

et al. 2015

Pol. J. Environ. Stud.

View full text Add to dashboard Cite

show abstract

“…To provide adequate mixing energy, stirred batch reactors are most frequently used, particularly in small-scale laboratory investigations as they are simple to operate and install (Table 3) (Kabdasli et al, 2000;Kim et al, 2006;Xu et al, 2012;Folleto et al, 2013). At a larger scale, fluidized bed reactors are commonly used as these provide solution turbulence and a greater reactive surface area (Seckler et al, 1996) thereby reducing crystallization induction time (Bhuiyan, 2008).…”

Section: Chemical Precipitation Methods In Agitated Reactormentioning

confidence: 99%

“…Apart from liquid waste, ash from municipal sewage sludge generated by incineration is P-rich and has potential for struvite recovery (P constitutes 13-25% of the total mass) (Hong et al, 2005;Xu et al, 2012). However, it requires mechanical, thermal (incineration) or chemical (acid/base leach) pre-treatments to allow for P recovery because of its strong retention with other elements like Ca, Mg, Al and Fe (Hong et al, 2005).…”

Section: Municipal Wastementioning

confidence: 99%

Phosphorus recovery as struvite from farm, municipal and industrial waste: Feedstock suitability, methods and pre-treatments

et al. 2016

View full text Add to dashboard Cite

Global population growth requires intensification of agriculture, for which a sustainable supply of phosphorus (P) is essential. Since natural P reserves are diminishing, recovering P from wastes and residues is an increasingly attractive prospect, particularly as technical and economic potential in the area is growing. In addition to providing phosphorus for agricultural use, stripping P from waste residues and effluents lessens their nutrient loading prior to disposal. This paper critically reviews published methods for P recovery from waste streams (municipal, farm and industrial) with emphasis on struvite (MgNH 4 PO 4 6H 2 O) crystallization, including pretreatments to maximize recovery. Based on compositional parameters of a range of wastes, a Feedstock Suitability Index (FSI) was developed as a guide to inform *Manuscript Click here to view linked References researchers and operators of the relative potential for struivite production from each waste.

show abstract

“…The reaction is shown in Equation 1 (Zhang et al, 2004). (1) Struvite precipitation was commonly used in different processes such as raw swine wastewater (Lin et al, 2015), anaerobic digestate effluent (Hidalgo et al, 2016), sewage sludge ash (Xu et al, 2012), urine (Antonini et al, 2011Kemacheevakul et al, 2014;Latifian et al, 2014;Zhigang et al, 2008), washing wastewater (Huang et al, 2010b), and reject water of sludge thickening and dewatering (Ren et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Ammonium Recovery from Biocatalytic Calcification Reactor Effluent by Struvite Precipitation

2017

Global NEST Journal

View full text Add to dashboard Cite

Chemical precipitation is a suitable method for the recovery and removal of ammonium in water and a fertilizer known as MAP (magnesium ammonium phosphate; MgNH4PO4.6H2O; struvite) is obtained. Additionally, the advantage of this method is that environmental conditions do not have any effect compared to biological methods. In this study, the recovery of ammonium (Cmean=348 mg NH4 + /L ± 38.1; n=25) occurred after the hydrolysis of urea in the biocatalytic calcification reactor (BCR) effluent and it precipitated as struvite. The effects of operating parameters, such as different phosphate and magnesium sources, Mg 2+ :NH4 + :PO4 3-molar ratio, pH value, mixing speed-time, and fertilizer effect, were examined. The precipitates were characterized by X-ray diffraction and scanning electron micrograph. The optimum molar ratio of Mg 2+ :NH4 + :PO4 3− was determined as 1.25:1:1. Studies using different pH ranges (7-10) and this molar ratio showed that the ammonium recovery of approximately 96% was reached at a pH value of 9.36. It was seen that the rapid mixing (200 rpm) of 30-s period and the slow mixing (30 rpm) of 2-min period were sufficient for MAP precipitation. Struvite that was obtained after precipitation was used as a fertilizer and it was observed to have a positive effect on plant growth.

show abstract

Recovery of phosphorus as struvite from sewage sludge ash

Cited by 160 publications

References 24 publications

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

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

Phosphorus recovery as struvite from farm, municipal and industrial waste: Feedstock suitability, methods and pre-treatments

Ammonium Recovery from Biocatalytic Calcification Reactor Effluent by Struvite Precipitation

Contact Info

Product

Resources

About