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fluidized bed reactor crystallization

Magnesium phosphate crystallization in a fluidized-bed …

Apr 07, 2014· Fluidized-bed crystallization reduces sludge creation and provides an opportunity for phosphate recovery or reuse as fertilizer [11]. The FBR can remove phosphate by crystallization using metal ions such as calcium and magnesium from dilute effluents.

CFD simulation of an industrial MTO fluidized bed by coupling a

Three scales of MTO fluidized bed reactor-regenerator systems, i.e. pilot-scale, demonstration-scale and commercial-scale with the reactor diameter of …

Investigation of fluorapatite crystallization in a fluidized bed

Aug 20, 2018· This work further investigates fluoride removal from groundwater by induced crystallization in batch experiments and in a fluidized bed reactor (FBR). Phosphate rock (PR), which is an abundant ore and represents the basic raw material for the phosphatic fertilizer industry, was used as seed crystal in the induced crystallization process. RESULTS

Phosphorus Recovery in a Fluidized Bed Crystallization Reactor

A process for recovering phosphorus from wastewater in form of magnesium ammonium phosphate (MAP) crystals using a fluidized bed reactor was investigated. The phosphorus recovery ratio was found

INTRODUCTION TO FLUIDIZED BEDS

a shallow fluidized bed of (Hmf/Dt) < 2 with Group B and D particles, Canada et al. (1978) and Dunham et al. (1993) found that Uc increased with static bed height. This could be related to the undeveloped bubble flow in shallow beds before transition to turbulent fluidization can occur (Bi et al. 2000). Particle Size and Density

Phosphorus recovery in a fluidized bed crystallization reactor

A continuous treatment of filtrate from digested sludge was performed based on these optimum operation conditions and using a newly proposed fluidized bed system. The fluidized bed system has a seeder, which allowed control of the particle size distribution inside the crystallization tower. A recovery ratio higher than 90% was achieved for a

Iron crystallization in a fluidized-bed Fenton process

The mechanisms of iron precipitation and crystallization in a fluidized-bed reactor were investigated. Within the typical Fenton''s reagent dosage and pH range, ferric ions as a product from ferrous ion oxidation would be supersaturated and would subsequently precipitate out in the form of ferric hydroxide after the initiation of the Fenton reaction.

Pretreatment for water reuse using fluidized bed crystallization

Y1 - 2020/6. N2 - This research investigated the use of fluidized bed crystallization for removing scale forming species and natural organic matter (NOM) from treated municipal wastewater prior to water reclamation. The effect of pH on Ca2+, Mg2+, silica and NOM removal in a fluidized bed crystallization reactor (FBCR) was determined.

Design and Fabriion of a Low Cost Fluidized Bed Reactor

2005). The major parts of the fluidized bed reactors are: the fluidization vessel, the solids discharge, dust separator for the exit gas, the air supply and heat supply. A fluidized bed is a vessel containing a bed of solid particles, e.g. sand or alytically active particles, and a method of introducing gas from below.

Recovery of Cadmium by Crystallization of Cadmium

Van Dijk J.C., Braakensiek H. (1984). Phosphate removal by crystallization in a fluidized bed. Water Science and Technology, 17, 133–142. Google Scholar Schöller M. Van Dijk J.C., Wilms D.A. (1987). Recovery of heavy metals by crystallization in the pellet reactor. In: Environmental Technology K. De Waal and W. Van den Brink (Eds).

Fluidized bed

View in Semantic Map View in A-Z Index. A fluidized bed is a state of a two-phase mixture of particulate solid material and fluid, which is widely used in many modern technologies for efficient implementation of various physical and chemical processes. Fluidized beds have been used in technological processes such as: cracking and reforming of

Lead removal from synthetic wastewater by crystallization in a

Dec 15, 2008· A fluidized‐bed reactor (FBR) was employed in the study to remove lead from the synthetic wastewater by crystallization of metal carbonate precipitates on surfaces of the sand grains. For the influent concentration up to 40 mg/L, lead removal efficiency reached 99 % and the effluent concentration was less than 1 mg/L when the system was

Journal: Industrial & engineering chemistry process design and

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Pretreatment for water reuse using fluidized bed crystallization

Y1 - 2020/6. N2 - This research investigated the use of fluidized bed crystallization for removing scale forming species and natural organic matter (NOM) from treated municipal wastewater prior to water reclamation. The effect of pH on Ca2+, Mg2+, silica and NOM removal in a fluidized bed crystallization reactor (FBCR) was determined.

Fluidized Bed Reactors - Visual Encyclopedia of Chemical …

Mar 15, 2021· An acrylic airlift fluidized bed reactor (FBR) for struvite crystallization was designed ( Fig. 1 ). It consisted of a crystal growth area (area 1) and a collection area (area 2). These two parts were connected by plastic pipes and a small water pump. Particles crystallized and grew up in area 1, precipitates accumulated in area 2.

Fluoride Recovery in a Fluidized Bed: Crystallization of Calcium

Nov 19, 2005· The removal of fluoride in a fluidized bed reactor by crystallization on the surface of sand grains has been studied as an alternative to chemical precipitation, which generates huge amounts of a water rich sludge that is not possible to recover due to the high water content and the low quality of the sludge. Water recycling is required in order to …

Optimization of the fluidized bed for crystallization process: …

References. Ezzeddine, N. Meftah, A. Hannachi, Removal of fluoride from an industrial wastewater by a hybrid process coining precipitation and reverse osmosis, Desal.

Optimizing induced struvite crystallization in a fluidized bed …

Reactor configuration was also crucial for nutrient recovery by struvite. Due to the difficulties of struvite fines for their retainment in reactors, which led to lower recov-ery efficiency and poorer effluent quality, induced struvite crystallization in the fluidized bed reactor (FBR) has drawn a great deal of attention [22].

Fluidized bed reactor - Wikipedia

A fluidized bed reactor (FBR) is a type of reactor device that can be used to carry out a variety of multiphase chemical reactions. In this type of reactor, a fluid (gas or liquid) is passed through a solid granular material (usually a alyst) at high enough speeds to suspend the solid and cause it to behave as though it were a fluid.This process, known as fluidization, imparts many

Optimization and Cost Comparison of Reactor Types in a …

isothermal, adiabatic, and fluidized bed reactors. Overall, fluidized bed reactors are found to be the most cost effective in the styrene process based on the equivalent annual operating costs; however, a comparison based on the net present value of the entire styrene process containing each reactor would yield a more accurate comparison.

Design and Fabriion of a Low Cost Fluidized Bed Reactor

2005). The major parts of the fluidized bed reactors are: the fluidization vessel, the solids discharge, dust separator for the exit gas, the air supply and heat supply. A fluidized bed is a vessel containing a bed of solid particles, e.g. sand or alytically active particles, and a method of introducing gas from below.

Heavy metal removal from aqueous solution in sequential fluidized-bed …

In this study, the sequential fluidized bed reactors (FBRs), were used to remove heavy metals including, Cu, Pb, and Ni, from synthetic wastewater. Heavy metals were removed through crystallization of metal carbonate and hydroxide precipitates on the surface of sand grains. The results showed that t …

Recovery of Cadmium by Crystallization of Cadmium

Van Dijk J.C., Braakensiek H. (1984). Phosphate removal by crystallization in a fluidized bed. Water Science and Technology, 17, 133–142. Google Scholar Schöller M. Van Dijk J.C., Wilms D.A. (1987). Recovery of heavy metals by crystallization in the pellet reactor. In: Environmental Technology K. De Waal and W. Van den Brink (Eds).

Study of struvite crystallization in a semi-batch jet loop fluidized

Aug 18, 2015· A semi-batch jet loop fluidized bed reactor (JLFBR) was used as a crystallization reactor to remove nitrogen and phosphorus from synthetic wastewater through struvite crystallization. The reactor performance obtained in the JLFBR was compared with that in a same-size jet loop reactor (JLR). The time required to increase the initial pH of the …

Phosphorus recovery in a fluidized bed crystallization reactor

A continuous treatment of filtrate from digested sludge was performed based on these optimum operation conditions and using a newly proposed fluidized bed system. The fluidized bed system has a seeder, which allowed control of the particle size distribution inside the crystallization tower. A recovery ratio higher than 90% was achieved for a

Water softening by induced crystallization in fluidized bed

Fluidized bed and induced crystallization technology were coined to design a new type of induced crystallization fluidized bed reactor. The added particulate matter served as crystal nucleus to induce crystallization so that the insoluble material, which was in a saturated state, could precipitate on its surface.

Optimizing induced struvite crystallization in a fluidized bed …

Reactor configuration was also crucial for nutrient recovery by struvite. Due to the difficulties of struvite fines for their retainment in reactors, which led to lower recov-ery efficiency and poorer effluent quality, induced struvite crystallization in the fluidized bed reactor (FBR) has drawn a great deal of attention [22].

CFD simulation of an industrial MTO fluidized bed by coupling a

Three scales of MTO fluidized bed reactor-regenerator systems, i.e. pilot-scale, demonstration-scale and commercial-scale with the reactor diameter of …

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