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.

scholarly journals Morphology and Elemental Composition of Product Obtained from Struvite Fluidized Bed Reactor

2018 ◽  
Vol 28 (2) ◽  
pp. 139-149
Author(s):  
Franciszek Bydałek ◽  
Anna Kula ◽  
Jacek Mąkinia
Keyword(s):  
Fluidized Bed ◽  
Energy Dispersive Spectrometer ◽  
Treatment Plant ◽  
Fluidized Bed Reactor ◽  
Pilot Scale ◽  
X Ray Diffraction ◽  
Distant Future ◽  
Struvite Precipitation ◽  
Ph Level ◽  
Highly Porous

Abstract Phosphorus scarcity is no longer a distant future, therefore the idea of phosphoru recovery is currently widely adopted and developed. Technologies based on the struvite precipitation are consider to address the future P challenges in the optimum way. This paper presents the results of the pilot scale implementation of fluidized bed reactor for struvite precipitation at the wastewater treatment plant. The test was carried out to assess the applicability of the technology in terms of robustness and final product quality, operating at low pH level (7,5-7,8). Obtained struvite pellets were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) with an energy dispersive spectrometer (EDS). The presence of foreign ions and particulate impurities in the feed source, affected the uniform growth of the crystal structure, resulting in highly porous structure of the pellets. Despite the varying physiochemical conditions, typical for wastewater, obtained pellets were determined with 95% struvite purity.

Anaerobic treatment of low concentration waste water in an inverse fluidized bed reactor

2000 ◽  
Vol 41 (4-5) ◽  
pp. 245-251 ◽  
Author(s):  
P. Castilla ◽  
M. Meraz ◽  
O. Monroy ◽  
A. Noyola
Keyword(s):  
Fluidized Bed ◽  
Removal Efficiency ◽  
Suspended Solids ◽  
Municipal Wastewater ◽  
Specific Activity ◽  
Biomass Concentration ◽  
Fluidized Bed Reactor ◽  
Anaerobic Treatment ◽  
Low Concentration ◽  
Inverse Fluidized Bed

Low concentration synthetic and municipal wastewaters were treated at HRT as short as 3 and 0.6 h respectively in an anaerobic inverse fluidized bed. Both bioreactors showed gas hold up due to the liquid downflow pattern of the prototype. The bioreactor operated at 3 h had a removal efficiency of 83%, specific activity of 4.5 kg CODremoved/kg IVS (d and the gas hold up varied from 23 to 55%. The reactor treating municipal wastewater had a removal efficiency of 44% when operating at 0.6 h, the specific activity was 4.2 kg CODremoved/kg IVS (d and no biogas was detected apparently because an important fraction was dissolved in the liquid phase. The biomass concentration was 13.8 and 1.1 kg IVS/m3 for synthetic and municipal wastewater and the SEM microphotographs showed a bacterial diversity for the first run and only cocci cells for the second run. The system does not remove suspended solids, so a polishing postreatment to improve water quality has to be implemented.

Anaerobic treatment of sulfate-containing municipal wastewater with a fluidized bed reactor at 20 °C

2016 ◽  
Vol 73 (10) ◽  
pp. 2446-2452 ◽  
Author(s):  
B. Düppenbecker ◽  
P. Cornel
Keyword(s):  
Fluidized Bed ◽  
Removal Efficiency ◽  
Municipal Wastewater ◽  
Oxygen Demand ◽  
Fluidized Bed Reactor ◽  
Anaerobic Treatment ◽  
Cod Removal ◽  
Sulfate Reducing ◽  
Mass Flows ◽  
Reducing Bacteria

This study focuses on the anaerobic treatment of sulfate-containing municipal wastewater at 20 °C with a fluidized bed reactor. Mean influent chemical oxygen demand (COD) and sulfate concentrations were 481 and 96 mg/l. The response of the COD removal efficiency to increasing organic loading rates (OLR) was investigated. Average total COD removal was 61% at OLR between 2.7 and 13.7 kg COD/(m³·d) and did not distinctly depend on the OLR. To assess the removal efficiency in more detail the COD in- and output mass flows were balanced. The results showed that only 11–12% of the input COD was recovered as gaseous methane. About 12–13% of the input COD remained in the effluent as dissolved methane. Furthermore, a distinct amount of 12–19% of the input COD remained in the reactor as settled sludge and was not further biologically degraded. Due to the reduction by sulfate-reducing bacteria, 13–14% of the input COD was degraded. Further adverse impacts of the influent sulfate on the anaerobic treatment process are discussed as well.

Experimental Studies on H2-Rich Gas Production by Co-Gasification of Coal and Biomass in an Intermittent Fluidized Bed Reactor

2013 ◽  
Vol 724-725 ◽  
pp. 1127-1131 ◽  
Author(s):  
Li Qun Wang ◽  
Zhao Sheng Chen
Keyword(s):  
Fluidized Bed ◽  
Experimental Studies ◽  
Fluidized Bed Reactor ◽  
Gas Production ◽  
Molar Ratio ◽  
Carbon Conversion ◽  
Mass Ratio ◽  
Heating Value ◽  
Product Gas ◽  
Gasification Temperature

This paper illustrates the experimental results of co-gasification of biomass and coal in an intermittent fluidized bed reactor, aiming to investigate the effects of gasification temperature (T) and steam to biomass mass ratio (SBMR) on the composition, yield, low heating value (LHV) and carbon conversion efficiency of the product gas. The results show that H2-rich gas with a high LHV is generated, in the range of 12.22-18.67 MJ/Nm3, and the H2 content in the product gas is in the range of 28.7-51.4%. Increases in temperature lead to an increase in CO and H2 content. The H2/CO molar ratio in the product gas is close to 1 at temperature above 925 °C. With steam addition, the H2 content increases gradually, while the content of CO increases first and then decrease correspondingly. The molar ratio of H2/CO is close to 1 with the smallest supplied amount of steam addition (SBMR =0.4).

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.

APLIKASI PROSES BIOLOGI ANAEROBIK PADA PENGOLAHAN AIR LIMBAH ORGANIK BERKONSENTRASI GARAM TINGGI “STUDI KASUS INDUSTRI UME BOSHI”

2018 ◽  
Vol 1 (2) ◽  
Author(s):  
Ikbal Mahmud
Keyword(s):  
Fluidized Bed ◽  
Removal Efficiency ◽  
Loading Rate ◽  
Salt Content ◽  
Fluidized Bed Reactor ◽  
Anaerobic Treatment ◽  
Evolved Gas ◽  
Toc Removal ◽  
Anaerobic Fluidized Bed Reactor ◽  
Organic Carbon Loading

Anaerobic treatment of wastewater with high organic and salt content but low pH (TOC, 14 g/l; salt, 150 g/l; pH,2.7) generated during an “ume boshi” manufacturing process was investigated. Five-fold-diluted “ume boshi” effluent was treated by a draw-and-fill method at a volumetric TOC (total organic carbon) loading rate of 3.0  g/l/d with a TOC removal efficiency of 75%. Five-fold-diluted “ome boshi” effluent was also treated in an anaerobic fluidized-bed reactor (AFBR) at a maximum volumetric TOC loading rate of 3.0 g/l/d, which gave almost the same results as the draw-and-fill method. However, ten-fold-diluted “ome boshi” effluent could be treated in the AFBR at a maximum volumetric TOC loading rate of 11 g/l/d with a TOC removal efficiency of 85%. The methane content in the evolved gas was high, being 70%. The red pigment in the “ome boshi” effluent was completely decolorized by the anaerobic treatment.  Key words :, Anaerobic fluidized-bed reactor, “Ume boshi”Co2+ and Ni2+ ions, decolorization

Treatment of organic wastewater by anaerobic biological fluidized bed reactor

1994 ◽  
Vol 29 (12) ◽  
pp. 157-166 ◽  
Author(s):  
Szu-Kung Tseng ◽  
Min-Ray Lin
Keyword(s):  
Wastewater Treatment ◽  
Specific Surface ◽  
Fluidized Bed ◽  
Removal Efficiency ◽  
Temperature Drop ◽  
Biomass Concentration ◽  
Fluidized Bed Reactor ◽  
Anaerobic Reactor ◽  
Digestive Rate ◽  
Organic Wastewater

Anaerobic biological fluidized bed method (AFBBR) for wastewater is already known to have higher specific surface area and biomass concentration than the conventional complete-mixing anaerobic reactor, so the removal efficiency for organic wastewater treatment is higher. Experiments were carried out with three kinds of wastewaternamely synthetic domestic and MSG wastewater. The results show that the AFBBR can exploit its advantages to compensate for the decrease in the digestive rate caused by temperature drop, while still showing the high treatability of organic wastewater. Treating wastewater containing chlorophenol and nitrophenolat below 0.9 kg compound/m3.d, the COD removal efficiency can reach ≥ 90%.

Magnesium phosphate crystallization in a fluidized-bed reactor: Effects of pH, Mg:P molar ratio and seed

2014 ◽  
Vol 125 ◽  
pp. 90-96 ◽  
Author(s):  
Chia-Chi Su ◽  
Lorenz Docena Dulfo ◽  
Maria Lourdes P. Dalida ◽  
Ming-Chun Lu
Keyword(s):  
Fluidized Bed ◽  
Fluidized Bed Reactor ◽  
Magnesium Phosphate ◽  
Molar Ratio ◽  
Effects Of Ph

scholarly journals Investigation on the Removal of Carbon Dioxide Exhausted from Industrial Units in a Lab-Scale Fluidized Bed Reactor

2020 ◽  
Vol 15 (2) ◽  
pp. 579-590
Author(s):  
Puriya Mohamad Gholy Nejad ◽  
Mohammad Sadegh Hatamipour
Keyword(s):  
Calcium Hydroxide ◽  
Fluidized Bed ◽  
Surface Area ◽  
Removal Efficiency ◽  
Flow Rate ◽  
Co2 Concentration ◽  
Fluidized Bed Reactor ◽  
Solution Flow Rate ◽  
Co2 Removal ◽  
Co2 Removal Efficiency

In this study, CO2 removal efficiency from flue gas was investigated in a fluidized bed reactor under semi-dry conditions. A lab-scale fluidized bed reactor, filled with inert glass beads, was used to investigate the effect of operating parameters on the CO2 removal efficiency using calcium hydroxide slurry as the absorbent. The Taguchi design method was used to design the experiments. The maximum inlet concentration of CO2 was 3 vol%. The most important factors were the reaction surface area, inlet gas velocity, inlet CO2 concentration, absorbent solution flow rate, inlet gas temperature and calcium hydroxide slurry concentration. The experimental results indicated that the CO2 removal efficiency increased when increasing the effective surface area of the reaction. Moreover, the removal efficiency increased by decreasing the input gas flow rate and inlet CO2 concentration. By performing experiments under optimum conditions, the maximum obtained CO2 removal efficiency was 79%. Copyright © 2020 BCREC Group. All rights reserved 

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