Nutrients Recovery by Struvite Formation from Wastewater in a Fluidized Bed Reactor

2005 ◽  
Vol 486-487 ◽  
pp. 387-390 ◽  
Author(s):  
Chan Won Lee ◽  
H.B Kwon ◽  
Young Jin Kim ◽  
Hong Pyo Jeon
Keyword(s):  
Fluidized Bed ◽  
Nutrient Removal ◽  
Fluidized Bed Reactor ◽  
Swine Wastewater ◽  
Synthetic Wastewater ◽  
Molar Ratio ◽  
Optimum Conditions ◽  
Operational Parameters ◽  
Ft Ir ◽  
Removal And Recovery

Nutrient removal and recovery from wastewater is being challenged to avoid eutrophication problems, and the discharge standards have also been tightened by water regulations. Therefore, this study was undertaken to recover the nutrients from both synthetic wastewater and swine wastewater in a fluidized bed reactor (FBR). The operational parameters were changed to find out the optimum conditions for struvite formation. The most suitable pH was identified around pH 9. When the molar ratio of magnesium as Mg: P was 2:1 in the FBR, the removal efficiency of NH4-N and PO4-P was 79 and 90 %, respectively. The seed material was effective to form struvite in the condition of 30 g dosage. Struvite crystallization in reaction was completed in 20 minutes. The growth of struvite crystals was confirmed by the analysis of XRD, FT-IR and TG-DTA. In addition, the struvite was successfully recovered when the optimum conditions were applied to the swine wastewater.

scholarly journals Design and Optimization of Fluidized Bed Reactor Operating Conditions for Struvite Recovery Process from Swine Wastewater

Processes ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 422 ◽  
Author(s):  
Soomin Shim ◽  
Seunggun Won ◽  
Arif Reza ◽  
Seungsoo Kim ◽  
Naveed Ahmed ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Recovery Process ◽  
Operating Conditions ◽  
Swine Wastewater ◽  
Molar Ratio ◽  
Circulation Rate ◽  
N Recovery ◽  
Operational Parameters ◽  
Struvite Crystallization ◽  
Reactor Operating

Struvite crystallization using fluidized bed reactors (FBRs) is one of the most commonly used methods for nutrient recovery from different waste streams. However, struvite recovery from swine wastewater containing much higher solids using FBR has not been studied extensively. In this study, we therefore designed and optimized the key operating conditions parameters, i.e., pH (9.0, 9.5, and 10.0), circulation rate (CR) (1.5, 3.0, and 4.5 L/Lreactor·h), and hydraulic retention time (HRT) (1, 3, and 5 h) of FBR to ensure efficient nutrient removal and struvite crystallization from swine wastewater using response surface methodology (RSM) with central composite design (CCD) as experimental design. A magnesium/phosphorus (Mg/P) molar ratio of 1.3 was maintained with MgCl2 according to ortho-phosphate (O-P) concentration of influent and an air diffuser was set to supply air with 0.03 L air/Lreactor·min. The O-P recovery efficiency of over 91% was achieved through the entire runs. Among the operational parameters, pH did not show any significant effect on NH4-N recovery, particle size, and struvite production rate (SPR). The optimal CR over 2.94 L/Lreactor·h was found to be appropriate for efficient removal of nutrients and struvite crystallization. While optimizing the HRT, priority of the process operation such as the production of larger struvite particles or increased struvite productivity should be considered. Therefore, the optimal operational parameters of pH 9.0, CR > 2.94 L/Lreactor·h, and HRT of 1 or 5 h were chosen to obtain better responses through RSM analyses. The findings of this study would be useful in designing and operating either pilot- or full-scale FBR for struvite crystallization from swine wastewater.

Chemical and Biological Processes for Nutrients Removal and Recovery

2020 ◽  
pp. 102-138
Author(s):  
Dafne Crutchik Pedemonte ◽  
Nicola Frison ◽  
Carlota Tayà ◽  
Sergio Ponsa ◽  
Francesco Fatone
Keyword(s):  
Nutrient Removal ◽  
Nitrogen Concentration ◽  
Chemical Precipitation ◽  
Phosphorus Recovery ◽  
Nutrients Removal ◽  
Operational Parameters ◽  
Nitrogen And Phosphorus ◽  
Phosphorus Accumulation ◽  
Biological Phosphorus ◽  
Removal And Recovery

This chapter gives an overview on the main technologies for nutrient removal from industrial wastewater by focusing on principles and operational parameters of real applications. A plethora of technologies can achieve the nutrients removal from wastewater depending mainly on their concentration and forms; however, biological nitrification and denitrification and chemical precipitation are the most common processes used today to remove nitrogen and phosphorus, respectively. Stripping, adsorption and membrane based processes for nutrients recovery can be economically viable only when nitrogen concentration is higher than 1.5-2 gN/L. On the other hand, phosphorus recovery should always be pursued and struvite crystalization is the most common option that should be evaluated together with biological phosphorus accumulation in sludge or plants for the following post-processing and valorization.

Removal and recovery of lead in a fluidized-bed reactor by crystallization process

2015 ◽  
Vol 155 ◽  
pp. 6-12 ◽  
Author(s):  
Mark Daniel G. de Luna ◽  
Luzvisminda M. Bellotindos ◽  
Riño N. Asiao ◽  
Ming-Chun Lu
Keyword(s):  
Fluidized Bed ◽  
Crystallization Process ◽  
Fluidized Bed Reactor ◽  
Removal And Recovery

The Efficiency of Phosphorus Removal of Synthetic Wastewater through Struvite Crystallization in an Aerated Fluidized Bed Reactor

2018 ◽  
Vol 789 ◽  
pp. 59-63
Author(s):  
Susmardi Masti Casoni ◽  
Chandra Wahyu Purnomo ◽  
Muslikhin Hidayat
Keyword(s):  
Fluidized Bed ◽  
Flow Rate ◽  
Phosphorus Removal ◽  
Crystallization Process ◽  
Fluidized Bed Reactor ◽  
Aeration Rate ◽  
Synthetic Wastewater ◽  
Influent Flow ◽  
Mgcl2 Solution ◽  
P Removal

The high organic material contained in wastewater released into the environment asresults of various sources of human activities, such as phosphorus, can cause eutrophication. Thestruvite crystallization in an aerated fluidized bed reactor is one of the methods which able toimprove the efficiency of phosphorus removal. In this study, a mixture of synthetic wastewaters andthe MgCl2 solution was treated in a fluidized bed reactor equipped with aeration to produce thestruvite which can be utilized as a slow release fertilizer. Subsequently, the effect of aeration atdifference influent flow rate was investigated to correlate with the changing of phosphorusconcentration in the reactor effluent. The experiments were conducted for 240 minutes with thevariation of aeration are 0.5 L/min to 1.5 L/min; variation of influent flow rate of syntheticwastewater is 150 ml/min to 350 ml/min, with a constant influent flow rate of MgCl2 solution is 50ml/min. These solutions were maintained at the condition of pH 9. The results showed that theoptimal efficiency of phosphor removal which accounted for 82.5% occurred when the aeration rateof 1.5 L/min in the influent flow rate of 150 ml/min. From these findings, it is revealed that theefficiency of P removal in wastewater is obtained by a crystallization process which utilizing anaerated fluidized bed reactor and by increasing the aeration rate and the reactants contact time.

scholarly journals Recovering Zinc from electroplating wastewater by crystallization in a pellet reactor

2022 ◽  
Vol 964 (1) ◽  
pp. 012029
Author(s):  
Nhung Thi-Tuyet Hoang ◽  
Anh Thi-Kim Tran
Keyword(s):  
Fluidized Bed ◽  
Removal Efficiency ◽  
Energy Dispersive Spectrometer ◽  
Fluidized Bed Reactor ◽  
Molar Ratio ◽  
Morphological Observation ◽  
Zinc Hydroxide ◽  
Zinc Recovery ◽  
Electroplating Wastewater ◽  
Zinc Removal

Abstract A pellet reactor (PR) was used to investigate the ability for zinc recovery from electroplating wastewater. The pellet reactor is a fluidized bed reactor, in which the nucleated precipitation of heavy metals occurred on the surface of seeding material. The zinc removal efficiency was 75% at molar ratio [CO3 2-]/[Zn2+] of 2.5, the flowrate of 16 L/h, sand’s diameter of 0.25 – 0.5 mm, and sand’s mass of 50 g. The elemental analysis of zinc carbonate and zinc hydroxide crystallization was analyzed by X-ray energy dispersive spectrometer (EDS) and the surface was characterised by Scanning electron microscope (SEM) to get the morphological observation of the pellets after 38-day operation. This study demonstrated that the fluidized bed reactor can be considered a feasible method for zinc removal efficiency from electroplating wastewater to achieve sustainable development.

Chemical and Biological Processes for Nutrients Removal and Recovery

2017 ◽  
pp. 76-111
Author(s):  
Dafne Crutchik Pedemonte ◽  
Nicola Frison ◽  
Carlota Tayà ◽  
Sergio Ponsa ◽  
Francesco Fatone
Keyword(s):  
Nutrient Removal ◽  
Nitrogen Concentration ◽  
Chemical Precipitation ◽  
Phosphorus Recovery ◽  
Nutrients Removal ◽  
Operational Parameters ◽  
Nitrogen And Phosphorus ◽  
Phosphorus Accumulation ◽  
Biological Phosphorus ◽  
Removal And Recovery

This chapter gives an overview on the main technologies for nutrient removal from industrial wastewater by focusing on principles and operational parameters of real applications. A plethora of technologies can achieve the nutrients removal from wastewater depending mainly on their concentration and forms; however, biological nitrification and denitrification and chemical precipitation are the most common processes used today to remove nitrogen and phosphorus, respectively. Stripping, adsorption and membrane based processes for nutrients recovery can be economically viable only when nitrogen concentration is higher than 1.5-2 gN/L. On the other hand, phosphorus recovery should always be pursued and struvite crystalization is the most common option that should be evaluated together with biological phosphorus accumulation in sludge or plants for the following post-processing and valorization.

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