scholarly journals Impact of Crystalline Silicotitanate Particle Size on Cesium Removal Efficiency

2019 ◽  
Author(s):  
Sandra K. Fiskum ◽  
Amy M. Rovira ◽  
Michael G. Cantaloub ◽  
Andrew M. Carney ◽  
Heather A. Colburn ◽  
...  
Keyword(s):  
Particle Size ◽  
Removal Efficiency ◽  
Cesium Removal ◽  
Crystalline Silicotitanate

scholarly journals Impact of Precipitants on the Structure and Properties of Fe-Co-Ce Composite Catalysts

2016 ◽  
Vol 2016 ◽  
pp. 1-8
Author(s):  
Yongli Zhang ◽  
Shujuan Dai ◽  
Yanbo Zhou ◽  
Kai Lin
Keyword(s):  
Particle Size ◽  
Methyl Orange ◽  
Removal Efficiency ◽  
Cod Removal ◽  
Catalytic Wet Air Oxidation ◽  
Structure And Properties ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Composite Catalysts ◽  
Cod Removal Efficiency

Fe-Co-Ce composite catalysts were prepared by coprecipitation method using CO(NH2)2, NaOH, NH4HCO3, and NH3·H2O as precipitant agents. The effects of the precipitant agents on the physicochemical properties of the Fe-Co-Ce based catalysts were investigated by SEM, TEM, BET, TG-DTA, and XRD. It was found that the precipitant agents remarkably influenced the morphology and particle size of the catalysts and affected the COD removal efficiency, decolorization rate, and pH of methyl orange for catalytic wet air oxidation (CWAO). The specific surface area of the Fe-Co-Ce composite catalysts successively decreased in the order of NH3·H2O, NH4HCO3, NaOH, and CO(NH2)2, which correlated to an increasing particle size that increased for each catalyst. For the CWAO of a methyl orange aqueous solutions, the effects of precipitant agents NH3·H2O and NaOH were superior to those of CO(NH2)2and NH4HCO3. The catalyst prepared using NH3·H2O as the precipitant agent was mostly composed of Fe2O3, CoO, and CeO2. The COD removal efficiency of methyl orange aqueous solution for NH3·H2O reached 92.9% in the catalytic wet air oxidation. Such a catalytic property was maintained for six runs.

Stormwater runoff treatment filtration system and backwashing system

2019 ◽  
Vol 79 (4) ◽  
pp. 771-778 ◽  
Author(s):  
Junho Lee ◽  
Myungjin Lee
Keyword(s):  
Particle Size ◽  
Removal Efficiency ◽  
Recovery Rate ◽  
Stormwater Runoff ◽  
Pilot Scale ◽  
Solid Loading ◽  
Filter Media ◽  
Turbidity Removal ◽  
Filtration System ◽  
Combined Sewer

Abstract This study has been carried out to evaluate the applicability of the pilot scale hybrid type of stormwater runoff treatment system for treatment of combined sewer overflow. Also, to determine the optimum operation parameter such as coagulation dosage concentration, effectiveness of coagulant usage, surface loading rate and backwashing conditions. The pilot scale stormwater filtration system (SFS) was installed at the municipal wastewater plant serving the city of Cheongju (CWTP), Korea. CWTP has a capacity of 280,000 m3/day. The SFS consists of a hydrocyclone coagulation/flocculation with polyaluminium chloride silicate (PACS) and an upflow filter to treat combined sewer overflows. There are two modes (without PACS use and with PACS use) of operation for the SFS. In case of no coagulant use, the range of suspended solids (SS) and turbidity removal efficiency were 72.0–86.6% (mean 80.0%) and 30.9–71.1% (mean 49.3%), respectively. And, the recovery rate of filter was 79.2–83.6% (mean 81.2%); the rate of remaining solid loading in filter media was 16.4–20.8% (mean 18.8%) after backwashing. The influent turbidity, SS concentrations were 59.0–90.7 NTU (mean 72.0 NTU), 194.0–320.0mg/L (mean 246.7mg/L), respectively. The range of PACS dosage concentration was 6.0–7.1mg/L (mean 6.7mg/L). The range of SS and turbidity removal efficiency was 84.9–98.2 (mean 91.4%) and 70.7–96.3 (mean 84.0%), respectively. It was found that removal efficiency was enhanced with PACS dosage. The recovery rate of filter was 92.0–92.5% (mean 92.3%) the rate of remaining solid loading in filter media was 6.1–8.2% (mean 7.2%) after backwashing. In the case of coagulant use, the particle size of the effluent is bigger than influent particle size. The results showed that SFS with PACS use more effective than without PACS use in SS and turbidity removal efficiency and recovery rate of filter.

scholarly journals Effects of Reservoir Parameters on Separation Behaviors of the Spiral Separator for Purifying Natural Gas Hydrate

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5346
Author(s):  
Shunzuo Qiu ◽  
Guorong Wang
Keyword(s):  
Particle Size ◽  
Natural Gas ◽  
Removal Efficiency ◽  
Flow Rate ◽  
Gas Hydrate ◽  
Volume Fraction ◽  
Differential Pressure ◽  
Separation Performance ◽  
Recovery Efficiency ◽  
Natural Gas Hydrate

The spiral separator is an important tool for desanding in natural gas hydrate production, and the change of hydrate reservoir parameters has a great impact on spiral separator behavior. Mastering the influence law is helpful to improve the separation performance. Until now, there was still no detailed analysis of the effect mechanism between reservoir parameters and spiral separator behavior. In this paper, a downhole spiral separator was designed. Then, the effects of reservoir parameters (particle size, hydrate, volume fraction, and sand volume fraction) on separation performance (discrete phase distribution, separation efficiency, and differential pressure) with different flow rates were investigated by numerical simulation method Fluent 18.0. The results show that effects degree of reservoir parameters is in order from large to small: sand phase volume fraction, particle size, hydrate volume fraction. As the particle size increases, the separation performance is improved. When the sand volume fraction increases, the natural gas hydrate (NGH) recovery efficiency and differential pressure both increase, but the sand removal efficiency decreases. When the hydrate fraction increases, the separation performance change law is opposite to that when the sand volume fraction increases. In addition, with increasing the flow rate, the efficiency and differential pressure increase. Therefore, reservoir saturation and porosity can balance NGH recovery efficiency and sand removal efficiency. Furthermore, the spiral separator has good performance under the change of reservoir parameters. The performance of the NGH spiral separator can be also maintained by increasing the flow rate.

scholarly journals Study on Dust Turbulence-Chemical Agglomeration for Electrostatic Precipitation Technology

2021 ◽  
Vol 245 ◽  
pp. 03011
Author(s):  
Gao Shan ◽  
Xiao Li-chun
Keyword(s):  
Particle Size ◽  
Wind Speed ◽  
Removal Efficiency ◽  
Turbulent Mixing ◽  
Dust Removal ◽  
Electrostatic Precipitation ◽  
Middle Section ◽  
Agglomeration Effect ◽  
Inlet Box ◽  
Subsequent Chemical

Due to the turbulent mixing between agglomeration agent and dust, the number of collisions per unit time between particles and droplets increases with the particle size in the process of chemical agglomeration, and the agglomeration efficiency increases accordingly. Turbulent agglomeration can promote the agglomeration effect of subsequent chemical agglomeration by strengthening the collision between particles and agglomerant droplets. The author used chemical agglomeration and turbulent mixing to cooperate in order to improve the efficiency of dust removal. Turbulent mixing can promote chemical agglomeration from agglomeration effect and dust removal efficiency, which can greatly improve electric dust removal technologyTurbulent mixing is the most intense at the inlet box position, and the agglomeration effect is the best. Turbulent mixing synergistic effect has an effect on dust removal efficiency. Compared with the three curves, it can be seen that the dust removal efficiency increases rapidly with the increase of agglomeration concentration, the curve trend changes obviously. The dust removal efficiency can reach 98.36 % and it is the highest in the middle section when the wind speed is greater than 11.2m/s. Through the experiment, the turbulent mixing and chemical coagulation method has a good application prospect in the electrostatic precipitators.

scholarly journals Removal Efficiency and Adsorption aspects of Sand & Bagasse for Residual Surfactant from Laundry Wastewater (LW)

2019 ◽  
Vol 8 (3) ◽  
pp. 7804-7808
Keyword(s):  
Particle Size ◽  
Removal Efficiency ◽  
The Other ◽  
River Sand ◽  
Other Hand ◽  
Floral Diversity

Techno-economic, sustainable and eco-friendly approaches for removal of the residual surfactants from laundry wastewater (LW) had always been a prime necessity of environment especially for floral diversity. In the present study, river sand and bagasse were used as adsorbents for removal of residual surfactant from LW via adsorption. Anionic content of surfactant of LW (treated and untreated) was determined by hyamine solution. The effect of adsorbent size, mass of adsorbent and duration of adsorption on removal efficiency was studied. Results revealed that 90 micrometer (µm) particle size, 9 grams (g) adsorbent mass and 6 minutes duration for adsorption by sand as an adsorbent reflected 97.6% removal efficiency for surfactants from LW. On the other hand, 150 µm particle size showed 99.2% removal efficiency at 0.1 g adsorbent mass for 2 minutes duration of adsorption using bagasse as an adsorbent. The cementing aspects of treated LW were also investigated and it was found that treated LW by both adsorbents was superior in all the studied properties of cementing parameters. On comparison, bagasse was much better adsorbent with respect to quantity (mass of adsorbent) as well as duration of adsorption to remove residual surfactant from LW.

scholarly journals Upflow Filtration System Using Fiber-Ball Filter Media for the Treatment of Nonpoint Pollution

2021 ◽  
Vol 43 (3) ◽  
pp. 146-159
Author(s):  
Junho Lee ◽  
Daesik Song
Keyword(s):  
Particle Size ◽  
Removal Efficiency ◽  
Retention Time ◽  
Fine Particles ◽  
Head Loss ◽  
Sem Analysis ◽  
Operating Conditions ◽  
Filter Media ◽  
Filtration System ◽  
Fiber Ball

Objectives : The objective of this study is to investigate the performance of the fiber-ball media upflow filtration system for non-point pollutants treatment.Methods : The additional air backwashing nozzle were installed between upper and lower fliter media cartridge. The effect of feed SS concentration, surface overflow rate, retention time, head loss on the removal efficiency were investigated respectively. Particle size distribution, SEM, and backwashing effect were also analyzed.Results and Discussion : The operated of upflow filter mean retention time, mean head loss were 1.99 min, 7.2 cm. On condition of SOR 480 m3/m2/day, results indicate that the range of removal efficiency of turbidity and SS were 76.8 ~ 93.21% (mean 88.3%) and 85.4 ~ 97.9% (mean 92.7%), respectively. The effluent turbidity and SS were under 15 NTU, 20 mg/L, respectively.Conclusions : Since turbidity can be continuously monitored in a filtration non-point pollution treatment system, turbidity can be used as a operation factor in evaluating operating conditions. The particle size the effluent larger than the influent was due to bonding, collision and adsorption between particles in the pores of the filter media. SEM analysis showed that after backwashing, very fine particles in the filter medium were not removed but adhered to the fiber yarn and remained. The average recovery rate of fiber-ball media filtration was 88.7%, which is evaluated as excellent in backwashing.

scholarly journals Treatment of Leachate from Municipal Solid Waste Landfills using Low Cost Adsorbent

2019 ◽  
Vol 8 (4) ◽  
pp. 11207-11210
Keyword(s):  
Particle Size ◽  
Removal Efficiency ◽  
Low Cost ◽  
Adsorption Potential ◽  
Sequential Order ◽  
Experimental Conditions ◽  
Metal Contents ◽  
Municipal Solid Waste Landfills ◽  
Solid Waste Landfills ◽  
Feasible Action

Treatment of wastewater for their metal contents is gaining importance in these days. Amongst the various methods reported in the literature, metal adsorption potential by low cost adsorbents is found to be techno-economically feasible action. Studies carried out to evaluate adsorption potential of low cost adsorbents Rice husk (RH), Saw dust(SD) and Ground nut shell(GS) under varied experimental conditions viz. adsorbent bed depth, particle size of adsorbent are presented in this paper. The sequential order of removal potential was found to be SD>RH>GS. Inverse relationship with removal efficiency and particle size of adsorbents and linear relationship between removal efficiency and bed of the adsorbent has been recorded.

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