scholarly journals Characteristics of Ultrasonically Enhanced Low-Temperature Thermal Regeneration of Powdered Activated Carbon: A Case Study of Acetone and Aniline

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1298
Author(s):  
Dan Zheng ◽  
Zhiwei Zhou ◽  
Rui Yu ◽  
Menghu Wang
Keyword(s):  
Activated Carbon ◽  
Low Temperature ◽  
Ultrasonic Treatment ◽  
Heating Temperature ◽  
Mass Loss Rate ◽  
Operating Cost ◽  
Powdered Activated Carbon ◽  
Ultrasonic Power ◽  
Thermal Regeneration ◽  
Regeneration Efficiency

Effective regeneration of powdered activated carbon (PAC) is the key to reduce the operating cost of the PAC in wastewater treatment processes. In this study, volatile acetone and semi-volatile aniline were selected to investigate the regeneration characteristics of ultrasonically enhanced low-temperature thermal process. The results showed that the regeneration efficiency of the PAC that had adsorbed aniline or acetone increased with the increase in ultrasonic power, and optimal value of frequency and regeneration times were determined. The concentration and properties of organic solvents had a significant influence on the ultrasonic regeneration process. With the increase in heating temperature and regeneration time, the regeneration efficiency increased, but the loss of mass of the saturated PAC increased noticeably. With the combination of ultrasonic treatment in a solvent with low temperature heating, the PAC regeneration efficiency was successfully improved, and the PAC mass loss rate was noticeably reduced. The microjet, shock wave, and cavitation effects produced by ultrasonic treatment restored the specific surface area of the PAC, expanded its mesopore volume, and increased the pore diameter. A reasonable selection of the regeneration solution and optimization of the ultrasonic treatment conditions could create favorable conditions for subsequent low temperature thermal regeneration.

Regeneration of Granular Activated Carbon Using Dual-Frequency Ultrasound

2012 ◽  
Vol 616-618 ◽  
pp. 1707-1710
Author(s):  
Jiong Yuan Lu ◽  
San Fan Wang ◽  
Jin Feng Zhu
Keyword(s):  
Activated Carbon ◽  
Granular Activated Carbon ◽  
Experimental Results ◽  
Single Frequency ◽  
Dual Frequency ◽  
Thermal Regeneration ◽  
Regeneration Efficiency ◽  
The Individual ◽  
Better Than ◽  
Frequency Ultrasound

The saturate granular activated carbon(GAC) which adsorbed Ni2+ is regenerated using dual-frequency ultrasound. The individual frequency is 45KHz, 80KHz and 100KHz respectively. The experimental results show that the regeneration efficiency using dual-frequency ultrasound is better than that using single- frequency ultrasound under the same experimental condition. When the two ultrasound’s frequency is 45KHz, the regeneration efficiency is 81.03%, comparing single- frequency ultrasound it increase by 40% and it is the best in six group dual-frequency ultrasound. In conclusion, the dual-frequency ultrasound regeneration showed a possibility as an alternative to chemical and thermal regeneration of GAC.

Low powdered activated carbon concentrations to improve MBR sludge filterability at high salinity and low temperature

Desalination ◽  
2011 ◽  
Vol 276 (1-3) ◽  
pp. 403-407 ◽  
Author(s):  
Maxime Remy ◽  
Hardy Temmink ◽  
Paula van den Brink ◽  
Wim Rulkens
Keyword(s):  
Activated Carbon ◽  
Low Temperature ◽  
High Salinity ◽  
Powdered Activated Carbon ◽  
Carbon Concentrations

scholarly journals Thermal analysis as a method for evaluating the quality of regeneration of activated carbon used for purification of glycerin

Surface ◽  
2020 ◽  
Vol 12(27) ◽  
pp. 137-145
Author(s):  
M. V. Borysenko ◽  
◽  
Ya. M. Chubenko ◽  
I. I. Voitko ◽  
T. S. Chorna ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Methylene Blue ◽  
Activated Carbon ◽  
Low Temperature ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Activated Carbons ◽  
Thermal Regeneration

In this work, we investigated granular and powder activated carbons (AC) – initial and waste with adsorbed impurities after purification of technical glycerin and subsequent washing with water. The aim of this work was to quantify the adsorbed impurities in the spent AC using thermal analysis (TA) and to work out the conditions for thermal regeneration of AC. TA of AC samples was carried out in an atmosphere of helium and air; the specific surface area of AC was measured by the method of low-temperature desorption of argon (SAr). It was established by the TA method that water is released in the temperature range of 20 – 170 °C, and glycerin – 170 – 400 °C. Spent AC contains up to 22.8 wt. % H2O and up to 44.6 wt. % C3H5(OH)3. Based on these data, it was proposed to regenerate spent coal by heating at 400 °C in air. In the case of a granular AC sample, the regeneration proceeds completely, while for a powder AC sample, the specific surface area with respect to argon is restored only by 22 %, from the initial 2170 m2/g. The adsorption isotherms of methylene blue (MB) of the initial samples are located higher than for the spent ones, since in the spent ones part of the surface is occupied by adsorbed glycerin. The SMB values calculated from the adsorption of methylene blue in the spent AC samples are strongly overestimated in comparison with SAr. Probably, MB displaces glycerin from the surface or interacts with it to form complexes.

Improving the performance of membrane bioreactors by powdered activated carbon dosing with cost considerations

2010 ◽  
Vol 62 (1) ◽  
pp. 172-179 ◽  
Author(s):  
W. Yang ◽  
M. Paetkau ◽  
N. Cicek
Keyword(s):  
Activated Carbon ◽  
Membrane Fouling ◽  
Extracellular Polymeric Substances ◽  
Operating Cost ◽  
Membrane Bioreactors ◽  
Powdered Activated Carbon ◽  
Membrane Cleaning ◽  
17Β Estradiol ◽  
Overall Performance ◽  
The Cost

Effects of powdered activated carbon (PAC) dosing on the overall performance of membrane bioreactors (MBR) were investigated in two bench-scale submerged MBRs. Positive impacts of PAC dosing on membrane fouling and the removal of 17β-estradiol (E2) and 17α-ethyinylestradiol (EE2) were demonstrated over a six-month stable operational period. PAC dosing in the MBR increased the removal rates of E2 and EE2 by 3.4% and 15.8%, respectively. The average soluble extracellular polymeric substances (EPS) and colloidal total organic carbon (TOC) concentrations in the PAC-MBR sludge was 60.1% and 61.8% lower than the control MBR sludge, respectively. Lower soluble EPS and colloidal TOC concentrations in the PAC-MBR sludge resulted in a slower rate of trans-membrane pressure (TMP) increase during MBRs operation, which could prolong the lifespan of membranes. Cost assessment showed that PAC dosing could reduce the operating cost for membrane cleaning and/or membrane replacement by about 25%. The operating cost for PAC dosing could be offset by the benefit from its reducing the cost for membrane maintenance.

scholarly journals Methane enrichment on biogas generated from anaerobic digester using coconut shell-based activated carbon

2018 ◽  
Vol 159 ◽  
pp. 01030
Author(s):  
Ridwan Hakim ◽  
Nyoman Suwartha ◽  
Cindy Priadi
Keyword(s):  
Activated Carbon ◽  
Retention Time ◽  
Power Plants ◽  
Adsorption Process ◽  
Anaerobic Digester ◽  
Small Scale ◽  
Thermal Regeneration ◽  
Fixed Temperature ◽  
Feasible Alternative ◽  
Regeneration Efficiency

This study evaluates methane enrichment on biogas generated from Anaerobic Digester (AD) through CO2 adsorption process so that biogas can be used as fuel for vehicle engines, power plants, and natural gas substitutes. The experiment was observed by passing biogas synthesis (45% CH4 + 55% CO2) and biogas from cattle manure ±59.7% CH4, ± 37.1% CO2 and ±3.2% other gases) in spontaneously pressurized adsorption column. In addition, observation of CO2 adsorption capacity at various pressure and fixed temperature (27°C) was performed using pure CO2 (±98%). Methane in biogas has been successfully purified to 92% at 0.5 L/min flowrate and 79.6 seconds retention time. The adsorbent will be saturated after gas flowing for 60 and 80 minutes for synthesis biogas and biogas from AD on the amount of adsorbent of 266 grams. A change of surface area of activated carbon (AC) after thermal regeneration at 160°C for 2 hours was 7.51% and regeneration efficiency was 67%. The adsorption process followed Freundlich isothermal. This process can be feasible alternative technology to meet the need for biogas with high levels of methane in small-scale AD.

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