Study on regeneration of waste powder activated carbon through pyrolysis and its adsorption capacity of phosphorus

Li, Yang; Jin, Hailan; Liu, Wenbo; Su, Hang; Lu, Yao; Li, Jianfen

doi:10.1038/s41598-017-19131-x

Cited by 23 publications

(17 citation statements)

References 19 publications

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“…Moreover, the inorganic pre-treatment efficiently removed the ashes, thus leading to surface area increase. In addition, the advantage of SAC-H-A-C was the generation of high specific surface area, comparing with the previous results ( Supplementary Table S4 ) [ 29 , 30 , 31 ]. The enhanced surface areas could increase the adsorption capacity, which also raise the product value.…”

Section: Resultssupporting

confidence: 76%

Pre-Treatment Methods for Regeneration of Spent Activated Carbon

et al. 2020

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Spent activated carbon (SAC) usually exhibits a low specific surface area due to its high ash contents. In this study, pre-treatments, such as heat and acid treatments, were optimized to improve this feature. The heat pre-treatment did not reduce the ash content, nor did it increase the surface area. Because metallic ions adsorbed in SACs turn into ash upon the heat treatment. In the acid pre-treatment, the volatiles and fixed carbon were increased with decreasing ash contents. In this study, it was found that the surface area increase was correlated with the ratio between fixed carbon and ash. Among the pre-treatment methods, the combined heat and acid pre-treatment method highly increased the ratio, and therefore led to the surface area increase. Additionally, the acid pre-treatment was carried out using different types of acid (organic and inorganic acids) solutions to further improve the surface areas. The organic acid treatment caused a significant structural collapse compared to the inorganic acid treatment, decreasing the surface area. In particular, H3PO4 effectively removed ashes adsorbed on the activated carbon surface and regenerated the exhausted activated carbon. Both the heat and acid pre-treatments before chemical activation resulted in the positive effects such as strong desorption of pollutants and ashes within the internal structure of the activated carbon. Therefore, the regeneration introduced in this study is methodically the best method to regenerate SAC and maintain a stable structure.

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Section: Resultssupporting

confidence: 76%

Pre-Treatment Methods for Regeneration of Spent Activated Carbon

et al. 2020

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“…According to Table S1 and Figure 6c,d, the curve fit of the pseudo-second-order equation (r 2 = 0.999) is greater than that of the pseudo-first-order equation (r 2 = 0.930). The pseudo-second-order model indicates that a monolayer adsorption system and the chemical adsorption play the main roles in the process [35]. Other ZFAs produced similar results for ammonia nitrogen adsorption [36,37].…”

Section: Kinetic Analysismentioning

confidence: 67%

Removal of Ammonium from Swine Wastewater Using Synthesized Zeolite from Fly Ash

Tang

Wang

et al. 2020

Sustainability

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Synthetic zeolites with pretreated fly ash as a raw material were used to remove ammonium from wastewater using a hydrothermal method in this study. Two pretreatment methods of fly ash were used to compare the ammonium removal of zeolites: water-washing and pickling. In addition, the effects of several factors including the time, temperature, pH, adsorbent dosage, coexisting ions and initial concentration were investigated to gain insight into the adsorption rate, behavior and mechanism of synthetic zeolites for ammonium. N2 adsorption/desorption isotherms showed that the synthetic zeolite was a mesoporous material with a higher specific area (13.05 m2/g) than the values for raw fly ash (0.34 m2/g). The X-ray diffraction result suggested that the synthetic products mainly belonged to zeolite P and Y. The adsorption kinetic data fitted well with a pseudo-second-order model. The maximum ammonium adsorption capacity was 32.16 mg/g. The synthetic zeolites were also applied to adsorb the ammonium from real swine wastewater. The ammonium removal efficiencies in raw swine wastewater and effluent from the biochemical unit were 64.34% and 79.61%, respectively, which indicated that the synthetic zeolites have a good application for real ammonium wastewater.

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“…The most common method used for the regeneration of activated charcoal is thermal regeneration. Moreover, gasification by air, CO 2 or nitrogen, heating by microwave, pyrolysis and wet oxidation techniques have also been applied for the regeneration of activated charcoal 20 – 22 . Regeneration of activated charcoal had some benefits such as reducing the use of the coal and the natural resources, reducing the pollution caused by the waste of the used activated charcoal.…”

Section: Resultsmentioning

confidence: 99%

Continuous Butanol Fermentation of Dilute Acid-Pretreated De-oiled Rice Bran by Clostridium acetobutylicum YM1

Al-Shorgani

Al-Tabib

Kadier

et al. 2019

Sci Rep

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Continuous fermentation of dilute acid-pretreated de-oiled rice bran (DRB) to butanol by the Clostridium acetobutylicum YM1 strain was investigated. Pretreatment of DRB with dilute sulfuric acid (1%) resulted in the production of 42.12 g/L total sugars, including 25.57 g/L glucose, 15.1 g/L xylose and 1.46 g/L cellobiose. Pretreated-DRB (SADRB) was used as a fermentation medium at various dilution rates, and a dilution rate of 0.02 h−1 was optimal for solvent production, in which 11.18 g/L of total solvent was produced (acetone 4.37 g/L, butanol 5.89 g/L and ethanol 0.92 g/L). Detoxification of SADRB with activated charcoal resulted in the high removal of fermentation inhibitory compounds. Fermentation of detoxified-SADRB in continuous fermentation with a dilution rate of 0.02 h−1 achieved higher concentrations of solvent (12.42 g/L) and butanol (6.87 g/L), respectively, with a solvent productivity of 0.248 g/L.h. This study showed that the solvent concentration and productivity in continuous fermentation from SADRB was higher than that obtained from batch culture fermentation. This study also provides an economic assessment for butanol production in continuous fermentation process from DRB to validate the commercial viability of this process.

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Study on regeneration of waste powder activated carbon through pyrolysis and its adsorption capacity of phosphorus

Cited by 23 publications

References 19 publications

Pre-Treatment Methods for Regeneration of Spent Activated Carbon

Pre-Treatment Methods for Regeneration of Spent Activated Carbon

Removal of Ammonium from Swine Wastewater Using Synthesized Zeolite from Fly Ash

Continuous Butanol Fermentation of Dilute Acid-Pretreated De-oiled Rice Bran by Clostridium acetobutylicum YM1

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