A pilot-scale study of struvite precipitation in a stirred tank reactor: Conditions influencing the process

Cháfer, Amparo; Mangin, Denis; Barat, R.; Seco, A.

doi:10.1016/j.biortech.2007.12.003

Cited by 176 publications

(86 citation statements)

References 7 publications

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“…Chemical precipitation has been well documented as a popular technology for phosphate recovery from wastewater in pilotand a few full-scale evaluations [3,4]. It is fairly controllable and will produce high-quality of phosphate precipitates, typically struvite.…”

Section: Introductionmentioning

confidence: 99%

Phosphate adsorption from sewage sludge filtrate using zinc–aluminum layered double hydroxides

Cheng

Huang

Wang

et al. 2009

Journal of Hazardous Materials

201

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a b s t r a c tA series of layered double hydroxides (LDHs) with different metal cations were synthesized to remove phosphate in waste sludge filtrate from a municipal wastewater treatment plant for phosphorus recovery and to help control eutrophication. The highest phosphate adsorption capacity was obtained by using Zn-Al-2-300, that is LDHs with Zn/Al molar ratio of 2 and calcined at 300 • C for 4 h. Circumneutral and mildly alkaline waters appeared suitable for the possible application of Zn-Al LDHs due to the amphoteric nature of aluminum hydroxide. Phosphate adsorption from the sludge filtrate by the LDHs followed pseudo-second-order kinetics, and the adsorption capacity at equilibrium was determined to be ∼50 mg P/g. Adsorption isotherms showed that phosphate uptake in this study was an endothermic process and had a good fit with a Langmuir-type model. The absorbed phosphate can be effectively desorbed (more than 80%) from LDHs particles by a 5 wt% NaOH solution. The regeneration rate of used LDHs was ∼60% after six cycles of adsorption-desorption-regeneration.

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Section: Introductionmentioning

confidence: 99%

Phosphate adsorption from sewage sludge filtrate using zinc–aluminum layered double hydroxides

Cheng

Huang

Wang

et al. 2009

Journal of Hazardous Materials

201

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“…In particular, nutrient discharges into natural waters have contributed to an increase in eutrophication problems, resulting in serious consequences for aquatic life as well as for the provision of water for industrial and domestic use [74]. In the case of the food industry related to the production of frozen vegetables and prefried potatoes, the main problem lies in the presence of large amounts of phosphate in wastewater, leading to its accumulation in the process water unless elimination of phosphate occurs before to be reused [75].…”

Section: Phosphorus Precipitation From Wastewatersmentioning

confidence: 99%

Biomineralization Mediated by Ureolytic Bacteria Applied to Water Treatment: A Review

2017

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Abstract:The formation of minerals such as calcite and struvite through the hydrolysis of urea catalyzed by ureolytic bacteria is a simple and easy way to control mechanisms, which has been extensively explored with promising applications in various areas such as the improvement of cement and sandy materials. This review presents the detailed mechanism of the biominerals production by ureolytic bacteria and its applications to the wastewater, groundwater and seawater treatment. In addition, an interesting application is the use of these ureolytic bacteria in the removal of heavy metals and rare earths from groundwater, the removal of calcium and recovery of phosphate from wastewater, and its potential use as a tool for partial biodesalination of seawater and saline aquifers. Finally, we discuss the benefits of using biomineralization processes in water treatment as well as the challenges to be solved in order to reach a successful commercialization of this technology.

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“…Calcium is a major interfering ion affecting the deposit composition, decreasing struvite purity [37]. However, calcium increases the recovery and precipitation efficiency due to a phosphorus co-precipitation as struvite and calcium phosphates [38]. The theoretical production of struvite after the addition of magnesium in the urine collected in Tanks 1-6 was around 4.2 kg (2960 L with an average of 180 mg PO 4 3− -P/L).…”

Section: Magnesium Dose and Reaction Time Determination Urine Pre-trmentioning

confidence: 99%

Recovery of N and P from Urine by Struvite Precipitation Followed by Combined Stripping with Digester Sludge Liquid at Full Scale

Morales

Boehler

Buettner³

et al. 2013

Water

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A novel ammonia stripping method, including a CO 2 pre-stripper was used to treat a mix of supernatant liquor from an anaerobic digester and urine in order to recycle nitrogen as ammonium sulfate at full-scale in the WWTP Kloten/Opfikon. Waste streams were not generated, since the ammonia was recovered as a marketable nitrogen fertilizer, turning a waste product into a valuable product. The efficiency of this system was increased by means of the addition of pre-treated urine collected separately at EAWAG building. The separation step was performed by the use of water free urinals and urine diversion flush toilets. An increase of 10% in the liquid flux with the addition of the urine translated into a 40% increase of the ammonia concentration in the inlet of the stripping unit. The achievement of these percentages generated a proportional increase in the fertilizer production. The urine pre-treatment was carried out by adding magnesium to produce a precipitate of struvite. The first experiments with the combined treatment showed the feasibility of the combination of the separation and pre-treatment steps. OPEN ACCESSWater 2013, 5 1263

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A pilot-scale study of struvite precipitation in a stirred tank reactor: Conditions influencing the process

Cited by 176 publications

References 7 publications

Phosphate adsorption from sewage sludge filtrate using zinc–aluminum layered double hydroxides

Phosphate adsorption from sewage sludge filtrate using zinc–aluminum layered double hydroxides

Biomineralization Mediated by Ureolytic Bacteria Applied to Water Treatment: A Review

Recovery of N and P from Urine by Struvite Precipitation Followed by Combined Stripping with Digester Sludge Liquid at Full Scale

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